TX and QTX SERIES TRANSMITTERS - Arena Services, Inc · Next Chapter Transmitter TX and QTX SERIES TRANSMITTERS ... To support local video injection, ... Each transmitter’s laser

Transmitters 9 November 2001 77

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TX and QTX SERIES TRANSMITTERS

Contents

Equipment Description ................................................................................................................................................ 79Models .......................................................................................................................................................................... 82

Controls, Indicators, and Connectors ................................................................................................................. 84DT-TX Series Transmitters .............................................................................................................................. 84DT-QTX Controls and Connectors ........................................................................................................... 89

Functional Description ................................................................................................................................................. 91RF Signals ..................................................................................................................................................................... 93Optical Signals ........................................................................................................................................................... 94Control Signals ......................................................................................................................................................... 94DC Power .................................................................................................................................................................. 95

Automatic Shutdown .................................................................................................................................................... 96Break in the Forward Link ................................................................................................................................. 97Break in the Return Link ..................................................................................................................................... 97Setting Up Automatic Shutdown .................................................................................................................. 98

Installation ......................................................................................................................................................................... 100Before You Start .................................................................................................................................................. 100Tools and Equipment ........................................................................................................................................ 101Installing a Transmitter in the DT Shelf ................................................................................................... 102Checking Optical Output ................................................................................................................................ 105Checking Laser Bias Current ......................................................................................................................... 108Connecting the Optical Fiber ....................................................................................................................... 109Connecting the RF Signal ................................................................................................................................ 113

Setting Up the Transmitter ..................................................................................................................................... 114Tools and Equipment ........................................................................................................................................ 114Activating the Transmitter .............................................................................................................................. 115Setting the Transmitter for Manual Mode (DT-TX Series) ........................................................ 118Setting Up AGC ................................................................................................................................................... 120

Specifications ................................................................................................................................................................... 125

AM Optical Link Performance .............................................................................................................................. 127

78 9 November 2001 Transmitters


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Equipment Description

DT-TX series plug-in transmitters convert radio frequency (RF) input into an optical signal and send it, through single mode fiber optic cable, to optical receivers (nodes) in a hybrid fiber-coaxial network. The 200-TX modules are return transmitters; the 700-TX and 800-TX modules are forward transmitters.

The DT-QTX facilitates the use of dense wave division multiplexing (DWDM) for services such as high-speed internet access, telephony, and video-on-demand.

DT-QTX quadrature amplitude modulated (QAM) transmitters are part of the SpectraHub 1550 nm Analog/Digital Overlay Transport System designed for use in the Diamond Transport Shelf. The 810-QTX offers a 400 MHz to 870 MHz frequency response and is designed for forward narrowcast applications. The 210-QTX offers a 5 MHz to 200 MHz frequency response for return path applications.

Figure 35. Diamond™Transport Transmitter ModuleAll DT-TX and DT-QTX series transmitters fit into the DT-Shelf ’s universal slots. TX series transmitters transmit analog broadband signals over optical fiber. QTX series transmitters are part of Philips’ 1550 nm Analog/Digital Overlay Transport System.


Transmitter Frequency Response

Each Diamond Transport transmitter amplifies RF signal and directly modulates a DFB laser diode to produce optical output. Transmitter modules occupy one universal module slot in the 3U-high Diamond Transport Shelf.

Housing The die-cast aluminum housing protects sensitive internal circuits. The housing’s patented thermal design improves the heat dissipation, extending product life and enhancing reliability. An additional heat sink for the laser helps protect it in high-temperature environments.

Internal Circuits Each transmitter module contains a variable attenuator, adjusted automatically or manually, which lets you adjust the RF drive level to the laser. RF signals are amplified and pre-distorted before they reach the laser. Pre-distortion acts to linearize laser performance by improving second order distortions of the analog channels through distortion cancellation.

Electronic control circuits inside the module maintain constant optical output power and laser temperature, while communicating the transmitter’s status to the optional network interface card (NIC) on the Diamond Transport shelf; the NIC serves as the interface with local or remote monitoring systems.

The 800E-TX and 800G-TX series transmitters offer high isolation on the auxiliary RF input to facilitate insertion of local targeted video channels.

Transmitter Series Total Bandwidth Analog Bandwidth

200-TX 5-200 MHz 5-200 MHz

700-TX 45-750 MHz 45-550 MHz

800C-TX 45-862 MHz 45-862 MHz

800E-TX 45-862 MHz 45-650 MHz

800G-TX 45-862 MHz 45-862 MHz

210-QTX 5-200 MHz —

810-QTX 400-870 MHz —


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Each 210-QTX and 810-QTX is tuned to a specific International Telecommunication Union (ITU) channel wavelength at 256 QAM. The 810-QTX permits adjustment of fiber-length setting to meet the requirements of a particular link.

Front Panel LEDs and test points on the front panel let you monitor a transmitter’s performance. All Diamond Transport transmitters come with an optical connector on the front panel, providing access to both sides of the optical bulkhead.

The 200-TX, 700-TX, and 800C-TX series transmitters use the AGC/MAN switch to select automatic or manual gain control mode. The 800E-TX and 800G-TX transmitters offer an additional setting for customer-set AGC (AGC active with customer-optimized OMI). In the automatic mode, the transmitter compensates for minor fluctuations in the RF signal and maintains a constant RF drive level to the laser. In the manual mode, you’ll adjust this level with the manual gain control, also accessible through the front panel; RF drive level varies with fluctuations in the signal source. The 210-QTX and 810-QTX series transmitters do not have AGC.

Rear Panel RF, control, and DC signals enter the transmitter through connectors on the housing’s back panel. TX Series transmitters offer a second RF input for locally injected RF signals.


ModelsRefer to “AM Optical Link Performance” for details on optical link budgets.

Diamond Transport transmitters are available in several models. Use the following key to interpret model names.

To support local video injection, the 800E-TX and 800G-TX transmitter series offer higher isolation between the auxiliary and main inputs than the 800C-TX series offers. When combined with the DT-SRS sub-rack splitter, the combined isolation (between transmitters) of the locally injected channels is ≥ 60 dB. In addition, the 800E-TX and 800G-TX transmitter series provides three AGC options (Customer-set level, Factory-set level, and Manual [i.e., AGC off]) while the 800C-TX offers only Factory-set and Manual settings.

DT- _ _ _ _-TX- _____

Diamond Transport System

Highest Forward Frequency2 = 200 MHz (return)7 = 750 MHz (forward)8 = 862 MHz (forward)

Optical Connector OptionsFC/APC = FC/APCSC/APC = SC/APCE2000D = E2000

Optical Link Budget (dB)*10, 12, or 14 dB (200-TX models)05 to 15 dB (700-TX & 800-TX models)

Isolation and/or Optimization OptionsBlank = Optimized for 550 MHz Analog (700-TX only)Blank = Standard isolation (200-TX only)C = Optimized for 862 MHz Analog (800C-TX only)E = Optimized for 650 MHz Analog, High Isolation

Auxiliary RF Input (800E-TX only)G = Optimized for 862 MHz Analog, High Isolation

Auxiliary RF Input (800G-TX only)


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210-QTX and 810-QTX QAM Transmitters

The 810 series offers a 400 MHz to 870 MHz frequency response and is designed for both forward narrowcast and return path applications. The 210 series offers a 5 MHz to 200 MHz frequency response and is designed for return path applications.

Each transmitter’s laser is tuned to a specific International Telecommunication Union (ITU) channel wavelength:

• 810-QTX modules are available for ITU 21-59 (odd)

• 210-QTX modules are available for ITU 21-37 (odd)

DT- _ _ _-QTX _ _ - _____

Diamond Transport System

Bandwidth, Output Power210 = 200 MHz, 10 dBm810 = 870 MHz, 10 dBm

Optical Connector OptionsFC/APCSC/APCE2000

QAM Transmitter

International Telecommunications Union (ITU) Channel


Controls, Indicators, and Connectors

DT-TX Series Transmitters

Standardized controls, indicators, and connectors simplify installation and use of TX series transmitters.

Connectors on the rear of the transmitter modules plug into the Diamond Transport shelf. Cabling is connected to the shelf backplane, not directly to the module.

CAUTIONThe bulkhead and optical connector on a Diamond Transport transmitters is covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield. DO NOT put the screws back into the transmitters without the shield; doing so damages the Laser Safety Interlock switch.

Figure 36. Standardized Controls, Indicators, and ConnectorsTo simplify installation and use, DT-TX transmitters use a common set of controls, status indicators, and points of connection.


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DT-TX Series Controls, Indicators, and Connectors

Key Switch Safety key switch. Turn key to activate laser. See “Test Points and Controls.”

Optical Connector Ferrule or snap connector (under shield). Carries forward optical signal out of the transmitter module.

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AGC/MAN Switch Toggle switch. With 200, 700, and 800 series, turns automatic gain control on or off. A customer-set option is available on the 800E and 800G. See “Test Points and Controls.”

AGC LED Two-color (green/red) LED. See “LED Status Indicators.”

PWR LED Green LED. See “LED Status Indicators.”

LASER LED Amber LED. See “LED Status Indicators.”

MAN ADJ/Manual Gain Control

Adjusts the RF drive level to the laser by ± 3 dB. (See “Test Points and Controls.”) Used—on 800E-TX and 800G-TX—to adjust AGC level.

BIAS/Laser Bias Test Point

DC test point (10 mV/mA). Measures laser bias current.

RF Test Point RF drive level monitor. Used to adjust the RF drive. See “Test Points and Controls.” and specifications.)

DC Power Input 10-pin plug. Carries DC power into the transmitter.

Rear

Pan

el

• Pins 1 and 2 –5 VDC• Pin 3 Ground• Pins 4 and 5 +5 VDC• Pin 6 Ground• Pins 7 and 8 Ground• Pins 9 and 10 +24 VDC

Communications Edge connector. Connects to Diamond Transport shelf backplane. Carries control information into and out of the transmitter module.

Main RF Input Connects to Diamond Transport shelf backplane. Allows primary RF signal to enter the transmitter.

Auxiliary RF Input Connects to Diamond Transport shelf backplane. Allows auxiliary RF signal to enter the transmitter.

RF Bandwidths:

• 5–200 MHz for 200-TX • 550–750 MHz for 700-TX • 550–862 MHz for 800C-TX• 45–862 MHz for 800E-TX and 800G-TX.

Side

Pan

el SW3 & SW2 10-position switches used to configure the transmitter for Automatic

Shutdown. Set to accept logic signal from a specific 2RRX return receiver or FRX forward receiver.


LED Status Indicators Use the indicators, controls, and test points on the front panel of the module to monitor transmitter performance.

Label LED State

Indicates

AGC

Green

Red

Off

Transmitter is in AGC mode, and its RF drive level has been automatically adjusted to match the factory-set AGC reference.

Transmitter is in AGC mode, but RF input to TX is outside of AGC operating window. The transmitter’s RF drive level cannot be automatically adjusted to match the factory-set RF level.

The transmitter is in manual mode. Use manual gain control to adjust the RF drive level by ± 3 dB from input level.

PWR

Green

Blinking Green

Off

Transmitter module is powered.

Transmitter is stabilizing during initialization or is disabled by Automatic Shutdown.

No power to transmitter.

LASER(See also p 116.)

Yellow

Blinking Yellow

Flashing Yellow

Off

Laser is on.

Continuous blinking indicates laser temperature is above 65°C.

Single, periodic flashes indicate that laser has been disabled by Automatic Shutdown. The associated receiver periodically initiates the restart sequence.

If this occurs at start-up, the shield may be out of place or the bottom screw securing the shield is not tight.

If the unit has been running, laser temperature may be greater than 75°C.


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Test Points and Controls Test points and controls are mounted on the front panel for easy access.

CUSTFACTMAN

Label indicates AGC options and toggle positions.

Label DescriptionKey Switch Activates / deactivates laser. Allows the operator to “lock out” (by

removing the key) the transmitter for maintenance. (Note: Laser operates only when the shield that covers the optical connection is installed).

AGC/MAN

For more information, see “AGC Labeling and Toggle Positions” on page 88.

The 200-TX, 700-TX, and 800C-TX transmitters offer two AGC settings: Factory-set AGC Active and Manual Mode (no AGC).

The 800E-TX and 800G-TX transmitters offer three AGC settings: Customer-set AGC (optimized OMI) Active, Factory-set AGC Active, and Manual Mode (No AGC).

MAN ADJ Manual gain control. When the AGC switch is in manual, an operator may adjust the RF drive level to the laser.

When using customer-set AGC function (CUST setting) with 800E-TX and 800G-TX transmitters, use the manual gain control to set the AGC level.

BIAS DC test point. Use digital voltmeter to measure laser bias. (10 mV/mA).

RF Test Point RF drive level monitor test point (–20 dB relative to the transmitter’s RF input level). Used to adjust the RF drive to the optimum level. (See specifications.) For example, a transmitter with a rated input of +15 dBmV, should be adjusted to a level of –5 dBmV at the test point.


AGC Labeling and Toggle Positions

200-TX, 700-TX, and 800C-TX The 200-TX, 700-TX, and 800C-TX series transmitters offer two settings, with toggle positions indicated by the label above the toggle switch:

800E-TX and 800G-TXThe 800E-TX and 800G-TX series transmitters offer three settings, with toggle positions indicated by the label above the toggle switch:

NOTEDT-QTX transmitters do not offer AGC.

AGC

MAN

Toggle UP to activate AGC at factory-set level.

Toggle DOWN for manual mode.

Label not to scale.

Toggle UP to activate AGC at customer-set level.

Toggle CENTER to activate AGC at factory-set level.

CUST

FACT

MAN Toggle DOWN for manual mode.

Label not to scale.


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DT-QTX Controls and Connectors

Standardized controls, indicators, and connectors simplify installation and use of QTX series transmitters.

Connectors on the rear of the transmitter modules plug into the Diamond Transport shelf. Cabling is connected to the shelf backplane, not directly to the module

CAUTIONThe bulkhead and optical connector on a Diamond Transport transmitter are covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield. DO NOT put the screws back into the transmitters without the shield; doing so damages the Laser Safety Interlock switch.

Figure 37. DT-QTX Controls and ConnectorsDT-810-QTX fiber-length setting may be optimized through the front panel.


Label DescriptionKey Switch Safety key switch. Turn key to activate laser.

Optical Connector Snap connector (under shield).

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el Fiber Length Adjustment Available on 810-QTX series only

Fiber Test Point 1 volt / 10 km of fiber (800 series only)

PWR LED Green LED.

LASER LED Amber LED.

RF Gain Control Adjusts the RF drive level to the laser by ± 3 dB.

Laser Bias Test Point DC test point (10 mV/mA). Measures laser bias current.

RF Test Point RF drive level monitor. (Note that readings are 20 dB down.)

Side

and

Rea

r Pan

els DC Power Input 10-pin plug. Carries DC power into the transmitter.

Communications Edge connector. Connects to Diamond Transport shelf backplane. Carries control information into and out of the transmitter module.

Main RF Input Connects to Diamond Transport shelf backplane. Allows RF signal to enter the transmitter.

SW3 & SW2 10-position switches used to configure the transmitter for Automatic Shutdown.


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Functional Description

All TX series plug-in transmitters convert radio frequency (RF) input into an optical signal and process RF, optical, control, and DC power signals.

Diamond Transport 800E-TX and 800G-TX transmitters offer customer-adjustable AGC and a high-isolation auxiliary RF input for insertion of targeted video programs.

Figure 38. DT 200-TX, 700-TX, and 800C-TX FunctionsAll Diamond Transport transmitters process RF, optical, control, and DC power signals.

Figure 39. DT 800E-TX and 800G-TX FunctionsDT 800E-TX and 800G-TX transmitters offer customer-adjustable AGC and a high-isolation auxiliary RF input.


The DT-QTX facilitates the use of dense wave division multiplexing (DWDM) for digital services such as high-speed internet access, telephony, and video-on-demand.

Each transmitter’s laser is tuned to a specific International Telecommunication Union (ITU) channel wavelength.

Figure 40. DT-QTX FunctionsEach transmitter’s laser is tuned to a specific ITU channel and is factory-configured for fiber length at 256 QAM.


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RF Signals Input Ports: RF signals from the shelf backplane enter the transmitter through RF connectors on the rear of the transmitter module. The recommended RF input level depends on the channel loading used.

In the 800E-TX and 800G-TX transmitters, auxiliary RF signals are injected after the pre-amplifier hybrid. This helps to provide higher isolation between the auxiliary and main RF input ports.

• Main RF input allows primary RF signals to enter the module.

• Auxiliary RF input (not available on the DT-QTX) allows injection of auxiliary RF signals for applications such as targeted services (local programming).

Combiner: Auxiliary signals are attenuated by an internal directional coupler, yielding lower levels than those of the main RF input. See specifications for details.

Variable PIN Attenuator: After passing through the combiner, RF signals then pass through a variable PIN attenuator, adjusted by AGC or manual gain control. The PIN attenuator allows you to adjust, either manually or automatically, the RF drive level by ±3 dB.

Pre-amplifier Hybrid: Next, a hybrid amplifies the signal.

RF Test Point (Drive Level Monitor): A directional coupler directs a portion of the amplified signals to the RF drive level monitor test point, which is used to adjust the RF drive to the optimum level. Using this test point, you can adjust the transmitter’s gain for –20 dB relative to the laser’s RF drive level. (See specifications.) This test point is accessible through the transmitter’s front panel.

Post-amplifier Hybrid: A post-amplifier hybrid amplifies the RF signals.

Gain Control Circuitry: The 800E-TX and 800G-TX series transmitters offer three AGC modes: Customer AGC (AGC On with customer-optimized OMI), Factory AGC (ACG On with factory-set OMI), and Manual (AGC Off). Other DT-TX series transmitters offer Manual and Factory AGC modes only. The DT-QTX series does not offer AGC .

If the transmitter is set to manual gain control mode, use the manual gain control, a potentiometer accessible through the front cover of the transmitters, to adjust the variable PIN attenuator.


AGC AND PROOFING WITH CW CARRIERSDo not use AGC when proofing transmitters that operate with CW carriers. When CW carriers are used, the AGC circuit reduces gain by about 2.0 dB, which reduces a link’s C/N by 2.0 dB from what would be achieved with modulated carriers.

A coupler directs a portion of the amplified signals to an automatic gain control (AGC) broadband detector. The DC output of the AGC detector is routed to a comparator, which checks the voltage against a factory-set reference. This reference is set for modulated carriers; when constant wave (CW) carriers are used in the AGC mode, the levels of the carriers are 2.0 dB lower than they are when modulated carriers are used. The DC output of the comparitor adjusts the variable PIN attenuator.

Optical Signals Laser: The laser converts the RF signals to optical signals that exit the module through an optical connector on the front panel. (Output power varies by model.)

Control Signals A sample of the optical signal enters a closed loop circuit that monitors the laser’s output power and temperature.

Photodetector: A photodetector captures this sample and converts it to a DC voltage representing the optical output power. Then, this voltage is sent to various monitoring circuits.

• An optical power monitor circuit compares the voltage to a factory-set reference level and generates a control signal.

• A bias control circuit receives information from the monitor circuit and uses it to adjust the optical output power of the laser, maintaining a constant power level. This control circuit also receives the Automatic Shutdown signal, from a 2RRX return receiver, FRX forward receiver, or a remote monitoring source. If triggered, the Automatic Shutdown signal breaks the closed loop, disabling the laser.

• The control circuit also receives signals from the safety interlock. If the shield protecting the optical connection is removed, the safety interlock breaks the closed loop, disabling the transmitter.


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Communications Connector: The communications connector collects control information, from this closed loop and others inside the transmitter module, and sends it through an edge connector on the transmitter’s rear panel to the shelf. When installed, the optional network interface card (NIC) enables local and remote monitoring of transmitter performance.

Thermoelectric Control Circuit: A second closed loop circuit monitors the internal temperature of the laser, adjusting it to maintain a constant level.

DC Power DC Power: Power enters the transmitter through the 10-pin connector on the rear of the module.


Automatic Shutdown

Automatic Shutdown prevents the transmission of light through severed fiber optic cables.

NOTEIf you plan to use the Automatic Shutdown feature, you must set the transmitter to support this feature before you install the transmitter. Automatic Shutdown is factory set to OFF.

For more information on Automatic Shutdown in redundant systems, see DT-Switch Driver.

Automatic Shutdown of the transmitter is triggered only under the following conditions:

• the transmitter is part of a two-way optical link,

• both the return receiver and the transmitter in the link are set up to communicate the logic signal over the same communication line, and

• the return receiver senses an absence of light in the return path and sends the necessary logic to the transmitter to disable it.

Automatic Shutdown is an active process that disables a transmitter only when the transmitter receives the required logic signal. Absence of the logic signal will not disable the transmitter, so this module will operate normally if no return receiver is in place or Automatic Shutdown is not used.

Return receivers can shut down transmitters that reside in the same shelf or in different shelves:

• For modules in the same shelf, no additional equipment is needed because the Automatic Shutdown logic signals travel from the return receiver to the transmitter via the shelf ’s back panel.

• For modules in separate shelves, the logic signal exits the return receiver and travels to the shelf ’s manual shutdown connector on the Diamond Transport shelf ’s back panel. The logic signal passes through a ribbon cable to the correct shelf and then travels through the shelf ’s back panel to the correct transmitter.

To carry the logic signal between shelves, install a ribbon cable with a 16-pin connector on each end.


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Break in the Forward Link

When the forward link is broken, the following events take place:

The 2RRX has a restart cycle that attempts to reactivate the link once it is restored.

• The NOR in the node detects the loss of light and shuts down the return transmitter (NRT).

• The 2RRX detects the loss of light from the node and shuts down the forward transmitter.

Break in the Return Link

When the return link is broken, the following events take place:

The FRX and 2RRX have restart cycles that attempt to reactivate the link once it is restored.

• The 2RRX detects the loss of light and shuts down the forward transmitter.

• The FRX detects the loss of light and shuts down the return transmitter

After shutdown occurs and a specific time interval passes, the return receiver sends a restart signal to the transmitter to check the condition of the link.

Figure 41. Break in the Forward LinkThe optical receiver at the end of a link detects a break in the forward link.

Figure 42. Break in the Return LinkA break in the return link is detected by the 2RRX, which signals the forward transmitter.


Setting Up Automatic Shutdown

To set a forward transmitter and return receiver (or return transmitter and forward receiver) in the same loop to use a specific communication line for automatic shutdown, set switches (see Figure 43) on each module to the same address.

Use this procedure for the 200-TX, 700-TX, and 800-TX. Set switches SW2 and SW3 before you install the transmitter into the shelf. If you don’t plan to use Automatic Shutdown, set both switches to the 0 position.

1. Identify (from “TX Switch Settings for Automatic Shutdown” ) the switch positions for SW2 and SW3 that correspond to the identification number of the communication line between the transmitter and the return receiver.

2. Use a non-conducting alignment tool to set both SW2 and SW3 to the positions matching the line address.

TX Switch Settings for Automatic Shutdown

* Do not use line 17. This line provides a ground for shelf connection external to this shelf and is not connected to the shutdown selector switches.

**Use line IDs 9 and 18 only when both the receiver and the transmitter are installed in one shelf.

ConnectorPin

LineNumber

SW2Setting

SW3Setting

— NO Auto Shutdown 0 0

1 1 0 1

3 2 0 2

5 3 0 3

7 4 0 4

9 5 0 5

11 6 0 6

13 7 0 7

15 8 0 8

-- **9 0 9

2 10 1 0

4 11 2 0

6 12 3 0

8 13 4 0

10 14 5 0

12 15 6 0

14 16 7 0

16 (GND) *17 8 0

— **18 9 0


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If a transmitter is linked to a return receiver in the same shelf, Auto Shutdown is now set. If a transmitter is linked to a return receiver in another shelf, connect the shelves by plugging one end of a ribbon cable into the manual shutdown connector on each shelf.

See the Receivers section of this Diamond Transport manual for more information on setting up receivers for Automatic Shutdown.

Proceed to “Installing a Transmitter in the DT Shelf” on page 102.

Figure 43. Switch SettingsSet switches SW2 and SW3 to correspond with communication line shared by the transmitter and receiver. Switches are factory-set to 0.


Installation

This section provides procedures for the following:

• installing the module into a rack-mounted Diamond Transport Shelf (page 102),

• checking optical output (optional, page 105),

• recording laser bias current (page 108), and

• making optical (page 109) and RF (page 113) connections.

Before You Start Review procedures before beginning this installation. Observe the following cautions:

• Do not disturb previously installed modules in the Diamond Transport Shelf, especially if there are fibers in place.

• Do not twist, bend, or pinch fibers when installing and removing modules.

If you plan to use automatic shutdown, you must set up the transmitter to use this feature before you install the module into the Diamond Transport Shelf.

WARNINGWhen powered, optical transmitters generate invisible, high-energy laser beams that can cause tissue injury, including permanent eye damage. Even when the transmitter is not powered, laser beams may be present in the incoming cable.

Avoid direct contact with the end of the cable and the optical output whenever optical cable is disconnected from the transmitter, receiver, or patch panel. Be absolutely certain the optical equipment at both ends of the cable is powered off before attempting to clean connectors.

Opening the transmitter module exposes the user to invisible laser radiation and electric shock and automatically voids the warranty. Do not remove the cover of the transmitter module. All user-adjustments can be made through the transmitter’s module cover.


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Tools and Equipment Hardware• Diamond Transport TX or QTX series transmitter(s)

• Diamond Transport Shelf mounted into a rack

• Power Supply Unit

Tools• small, non-conducting blade-type alignment tool

• Phillips screwdrivers

Meters• optical power meter

• voltmeter

• spectrum analyzer or field strength meter

Other• digital address (Automatic Shutdown address) of the

communication line between the transmitter and return receiver

• compressed air with an extension tube

• fiber optic reel cleaner

• lint-free tissue

• clean connector caps

• fiber optic patch cord with the appropriate connector

• cable passing RF signal source to transmitter

• 75-ohm, F-type terminator


Installing a Transmitter in the DT Shelf

All Diamond Transport transmitter modules (TX and QTX series) are installed in the same way, regardless of series number.

WARNINGThe transmitter is powered as soon as it is plugged into a powered shelf. Be sure the key switch is off before installing the transmitter.

Install a transmitter into a rack-mounted Diamond Transport Shelf as follows:

1. Lower the fiber-management tray by pulling down firmly on the tray’s front panel. Do not disturb fibers inside.

2. Select an open slot for the transmitter module. Note: Leave slots 1 and 2 open for one power supply and slots 3 and 4 for a second (redundant) power supply.

Figure 44. Connections Inside the DT-ShelfTo install a module in the DT-Shelf, pull down firmly on the fiber-management tray panel.


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Turn off the key switch before plugging the transmitter into a powered shelf.

3. Make sure the transmitter’s key switch is off. Then, hold the module with the fins on the left side, and slide the module part way into the slot. Verify that the module’s connectors line up with those on the shelf.

CAUTIONDo not push or pull on the shield. Do not use the shield as a handle.

The handle must be in the “release” position to permit the module to slide in fully.

Figure 45. Module InstallationHold the module with the fins on the left side and slide the module into the slot.


4. Pull the transmitter’s handle to the left (to clear the locking tab) and then forward, toward you.

5. Slide the module into the shelf until the base of the handle makes contact with the shelf. Then, push the handle back, away from you, to seat the module and secure reliable connections to power and control signal sources.

Leave the fiber-management tray down, and proceed to “Checking Optical Output” on page 105.

Figure 46. Locking/Release MechanismPull handle left around the locking mechanism and then forward.


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Checking Optical Output

Turn off the laser before you unplug the forward fiber or the optical power meter.

WARNINGUse an optical power meter with a connector that matches the one under the transmitter’s shield.


Verify the optical output power as follows:

1. Turn off the laser by turning the key counterclockwise. The yellow LASER LED goes out (dark).

2. Loosen the screws holding the shield in place, and remove the shield.


3. Plug the fiber from the optical power meter into the bulkhead.


4. Install the shield (removed in step 2), being sure to tighten both of its screws. The laser will not operate unless these screws are tightened.

5. Turn on the laser by turning the key clockwise. The yellow LASER LED glows.

6. Measure the optical output power with the optical power meter. The optical output power varies with the model of the transmitter, as indicated by the “Nominal Optical Output Power” table.

Figure 47. Connecting an Optical Power MeterPlug in the optical power meter to measure the optical output power of the transmitter.

Remove shield.

Connect the optical power meter to the bulkhead.


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Nominal Optical Output Power*

* Units manufactured since December 1, 1997. For performance of units manufactured before December 1, 1997, contact your Philips representative for specifications. (Refer to the serial number label for date of manufacturer.)

** Reduce these power levels by 0.2 dB per connection between the optical power meter and the bulkhead. For example, if you use a jumper between the power meter and the bulkhead, subtract 0.4 dB for loss.

7. Turn off the laser by turning the key counterclockwise. The LASER LED goes out (dark).

8. Remove the shield and unplug the optical power meter from the transmitter.

9. Connect the system fiber to the transmitter.

10. Reinstall the shield; be sure to tighten both of its screws.

Proceed to Checking the Laser Bias Current.

Model Nominal Optical Output Power**

210-TX & 210A-TX 6 dBm

212-TX& 212A-TX 8 dBm

214-TX& 214A-TX 10 dBm

705-TX & 805C/E/G-TX 3 dBm

706-TX & 806C/E/G-TX 4 dBm

707-TX & 807C/E/G-TX 5 dBm

709-TX & 809C/E/G-TX 6 dBm

710-TX & 810C/E/G-TX 7 dBm

711-TX & 811C/E/G-TX 8 dBm

712-TX & 812C/E/G-TX 9 dBm

713-TX & 813C/E/G-TX 10 dBm

714-TX & 814C/E/G-TX 11 dBm

715-TX & 815C/E/G-TX 12 dBm

210-QTX 10 dBm

810-QTX 10 dBm


Checking Laser Bias Current

Monitor and record laser bias current regularly to find out how much variability is normal for your transmitter. (For example, a 0.1 - 0.2 mA change per month may be normal for your transmitter.) Check any change that is greater than the typical laser current progression for your module.

Normally, laser bias currents increase slightly as the laser ages. Further, laser bias currents differ from transmitter to transmitter, so there is no correct bias measurement.

Record the laser bias current at initial installation. In general, for most transmitters, a change of more than 10 mA from the initial installation value warrants further investigation.

Check Laser Bias Current as follows:

1. If the laser is off, turn it on by turning the key clockwise. The LASER LED will light.

2. Insert the positive test lead from the voltmeter into the laser bias test point, labeled Bias, on the transmitter. Connect the negative lead to ground.

3. At this test point, 10 mV = 1 mA. To convert the voltage measurement to amperage (mA), first express the voltage in millivolts; then, divide this number by 10. (For example, 0.35 Volts at the laser bias testpoint equals 350 mV, which equals 35 mA.)

Proceed to “Connecting the Optical Fiber” on page 109.

Figure 48. Laser Bias Test PointUse the laser bias test point to check the laser bias current.

Laser Bias Test Point


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Connecting the Optical Fiber

Connect the fiber to a shelf-mounted Diamond Transport transmitter with a compatible, high-quality optical connector.

WARNINGBefore you begin, make sure the transmitter’s key switch is off.

Even when the transmitter is not powered, laser beams may be present in the optical cable. Although you can’t see them, these beams can cause tissue injury, including permanent eye damage. Whenever the optical cable is disconnected from the transmitter, receiver or patch panel, avoid direct contact with the end of the cable or optical output.

Figure 49. Preparation for Optical ConnectionMake sure the transmitter’s key switch is in the OFF position before you remove the screws that secure the shield. DO NOT put the screws back into the transmitters without the shield; doing so damages the Laser Safety Interlock switch.

Loosen these screws.


Connect the optical fiber as follows:

1. Set the transmitter’s key switch in the OFF position.

CAUTIONThe bulkhead and optical connector on a Diamond Transport transmitter are covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield. DO NOT put the screws back into the transmitters without the shield; doing so dam-ages the Laser Safety Interlock switch.Do not bend or twist optical fibers.

2. Loosen the screws holding the shield in place, and remove the shield.

FC Connector: Turn the threaded collar clockwise to tighten it onto the bulkhead.

SC or E2000 Connector: If you don’t hear or feel the connector engage with the bulkhead, gently grasp the boot on the connector and push it into the bulkhead. When properly installed, the connector clicks into position.

3. Clean the optical connectors (located in the bulkhead, behind the shield). See Cleaning Optical Connections: Transmitter Connectors and Bulkheads.

4. Remove the cap from the forward fiber side of the bulkhead


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5. Align the key on the fiber’s connector with the bulkhead’s slot, and slide the connector into the bulkhead until it locks. For an FC-type, screw the connector to tighten it. (See Figure 50.)

6. Reinstall the shield, making sure to tighten the screws. Note: The laser operates only when the shield is installed.

NOTEIt may be desirable to route fiber that is connected to transmitters in slots 3 – 5 to the left and fiber connected to transmitters in slots 6 – 9 to the right.

7. Place the fiber in the fiber-management tray.

Fiber may be routed out through either end of the fiber-management tray; however, do not allow fibers to cross one another. (Note that Figure 51 shows all fiber routed in one direction. Fiber may also be routed to both right and left as long as fibers do not cross.)Use the plastic clamps mounted inside the tray to bundle the fiber loosely together. Leave enough slack so that fibers are not pulled when you lower the fiber-manage-ment tray.

Figure 50. Optical ConnectorsAlign the key on the connector with the slot on the bulkhead.

FC Bulkhead

SC Bulkhead

FC Connector

SC Connector


8. Return the fiber-management tray to its upright position. Do not twist or pinch the fiber.

Proceed to “Connecting the RF Signal.”

Figure 51. Fiber RoutingOne possible fiber-routing method routes all fiber in the same direction. Fiber may also be routed to both right and left as long as fibers do not cross over one another.


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Connecting the RF SignalRF signal level that is too high or too low causes poor performance.

1. Use a spectrum analyzer to verify that the RF signal level (from the input cable) matches the level required by the system design.

2. Connect the cable containing the RF signal to the transmitter module as follows:

• If the RF input is at the specified level, connect RG-59 cable to the primary RF input port, labeled A. (See Figure 52.)

DT-QTX transmitters have only a primary RF input.

• If you plan to use an auxiliary RF input, verify the signal level matches the system design. Then, connect the cable to the auxiliary RF input port, labeled B.

• If you do not plan to use the auxiliary RF input, terminate that port with a 75-ohm, F-type terminator.

End of Procedure. Proceed to “Setting Up the Transmitter” on page 114.

Figure 52. RF Input ConnectorsConnect the cable containing the primary RF input signal to the primary RF input port on the shelf.


Setting Up the Transmitter

Once you’ve installed the Diamond Transport transmitter into the shelf and made the RF and optical connections, you are ready to set up the transmitter by doing the following:

• activating the laser

• setting the transmitter in manual or AGC mode

WARNINGWhen powered, optical transmitters generate invisible, high-energy laser beams. Even when the transmitter is not powered, laser beams may be present in the optical cable. These beams can cause tissue injury, including permanent eye damage. Avoid direct contact with the end of optical cable or optical output whenever optical cable is disconnected from the transmitter, receiver or patch panel.

Tools and Equipment • a shelf-mounted Diamond Transport transmitter installed in a link

• Phillips screwdrivers

• a spectrum analyzer or suitable substitute (such as a field-strength meter)

• multimeter

• non-conducting alignment tool


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Activating the Transmitter

Activate the transmitter as follows:

1. Make sure that transmitter’s activation key is in the off position.

2. If you haven’t done so already, connect the shelf ’s power supply to its power source.

3. Check the condition of the PWR LED.

• When the unit is first powered, the green PWR LED blinks for several seconds. Once the module is stable, the PWR LED glows steadily.

• If the PWR LED does not light, check that the power and control connectors are properly plugged into the receptacles on the rear panel of the shelf.

Figure 53. Power LEDWhen the transmitter is first powered, the PWR LED blinks for several seconds and then glows steadily to indicate that the module is receiving power.

Green PWR LED lit = Power On

Green PWR LED flashing= Module is stabilizing during activation.


4. Activate the laser by turning the key clockwise. The PWR LED glows steadily and the yellow LASER LED lights. If the LASER LED does not light and stay lit, check the following:

• the shield is in place,

• the bottom screw holding it is tightened, and

• the key switch is on.

LED Status ExplanationThe LASER LED is dark, and the green PWR LED is blinking.

The transmitter has been disabled by Automatic Shutdown. Check optical link status.

The LASER LED flashes periodically.

The transmitter, directed by a restart signal from the return receiver, is checking link status.

The LASER LED blinks continuously, and the PWR LED glows steadily.

Laser temperature is 65°C - 75°C.

The LASER LED is dark, and the PWR LED glows steadily.

If this occurs at start-up, the shield may be out of place or the bottom screw securing the shield is not tight.

If the unit has been running, laser temperature may be greater than 75°C.


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Proceed to Setting the Transmitter for Manual Mode.

Figure 54. LASER StatusTo activate the laser, turn the key clockwise.


Setting the Transmitter for Manual Mode (DT-TX Series)

In manual mode, you can set the RF drive level to the laser using the manual gain control.

DT-QTX transmitters do not offer AGC.

If you plan to use AGC, go to “Setting Up AGC” on page 120.

Set the transmitter to manual mode as follows:

When signal levels in the 200-TX return path change frequently due to ingress or scheduled addition or deletion of channels, the AGC adjusts the RF drive level, causing the RF level out of the receiver to change. To prevent this condition, operate the transmitter in manual mode.

1. Toggle the AGC/MAN switch down for manual mode.

2. Find the optimum RF drive level for the laser by referring to the RF input level listed in the transmitter specifications. Use the level that corresponds to the transmitter’s channel loading.

3. Connect a spectrum analyzer to the RF drive level monitor test point (on TX front panel).


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4. With a small, non-conducting alignment tool, adjust the manual gain control until the levels measured at the test point are 20 dB below the RF input level specification. Turn the control clockwise to increase the drive level; turn the control counterclockwise to decrease the drive level.

The manual gain control lets you adjust the RF drive level by ± 3 dB. For greater adjustment, check and adjust the level of RF signals entering the transmitter.

End of Procedure.

Figure 55. RF Drive LevelAdjust the RF drive level using a non-conducting alignment tool to turn the manual gain control.

AGCMAN

PWRAGC

LASER

BIAS

ON

MONITOR TP

MANADJ

714-TX

Toggle AGC/MAN switch down for manual mode.

Turn manual gain control clockwise to increase the level. Turn counterclockwise to decrease the level.

Connect a spectrum analyzer (or suitable meter) to the test point.


Setting Up AGC AGC mode provides the best C/N performance while maintaining distortions within the transmitter’s specifications.

The 200-TX, 700-TX, and 800C-TX transmitters offer factory-set AGC. The 800E-TX and 800G-TX transmitters offer both factory-set and customer-adjustable AGC.

If signal levels in the return path change frequently due to ingress or scheduled addition or deletion of channels, the AGC will adjust the RF drive level, causing the RF level out of the receiver to change. To prevent this condition, operate the transmitter in manual mode.

In AGC mode, a broadband AGC detector monitors the RF drive level to the transmitter and automatically directs a PIN attenuator to adjust the RF drive level (up to ± 3 dB) to match a fixed reference level. This reference level is set so that the transmitter achieves the optimum depth of modulation.

The broadband AGC detector sees the entire RF bandwidth and adjusts based on the total RF power present in the RF signal. The total RF power is a function of the number of analog channels loaded and whether the RF carriers are modulated or CW.

If you use channel loading different from that identified in the transmitter’s specifications, note that the AGC center point and the ± 3 dB window around it will change.

Determining the RF Input Level for AGC RF input level variations that are within the AGC window are automatically adjusted by AGC circuitry.

The required RF input level, and the ± 3 dB AGC window centered around it, changes with the number of channels loaded as shown in the following formula:

input level window = -10•log (# of channels/rated channel load)

Channel Loading

TX Series Nominal Input Level

AGC Window

128800C 13 dBmV +10 to +16 dBmV800G 17 dBmV +14 to +20 dBmV

77700 / 800C 15 dBmV +12 to +18 dBmV800E / 800G 19 dBmV +16 to +22 dBmV

40700 / 800C 18 dBmV +15 to +21 dBmV800E / 800G 22 dBmV +19 to +25 dBmV

20 200 18 dBmV +15 to +21 dBmV


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Using the Customer-Set AGC Function (800E-TX and 800G-TX)In cases where the transmitter application is significantly different from the application for which it is designed, performance may be optimized through the customer-set AGC option on 800E-TX and 800G-TX transmitters.

Set AGC on transmitters with this capability as follows:

1. Verify that the desired RF channel loading and levels are present at the transmitter input.

When the AGC switch is in the CUST position, the Manual Gain Control is used to set the AGC reference.

2. Toggle the AGC switch (front panel) to CUST position.

3. Adjust the Manual Gain Control for system CNR and distortions.

NOTEChanging the manual gain setting also changes the original level corresponding to AGC OFF changes. The factory-set AGC reference is not affected by varying the manual gain adjustment.

.

Figure 56. AGC/MAN Switch (DT-TX)Use the AGC/MAN switch to select AGC or manual mode.

AGC LED


Using the Factory-Set AGC Function

NOTEDo not use AGC when proofing transmitters that operate with CW carriers.

The AGC reference level is factory-set for modulated carriers. For constant wave (CW) carriers, the AGC detected power is 2.0 dB higher, and the AGC adjusts the RF drive downward to compensate. This causes the C/N of the link to be 2.0 dB lower, so you should not use AGC when proofing transmitters that operate with CW carriers.

AGC automatically adjusts the RF drive level to match the factory-set AGC reference level, not a manually set RF drive level. The 800E-TX and 800G-TX transmitters offer customer-adjustable AGC settings.

Set the transmitter for AGC mode as follows:

1. Toggle the AGC/MAN switch up for AGC.

2. Check the condition of the AGC LED:

If the AGC LED is green, the RF drive level to the trans-mitter has been adjusted to match the factory-set AGC reference level.

If the AGC LED is red, the RF drive level is outside the ± 3 dB adjustment window. Turn the activation key to off and go back to “Connecting the RF Signal” on page 113 to recheck the RF signal level entering the transmitter.


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Adjusting the DT-QTX Fiber-Length Setting (810-QTX only)The 810-QTX may be used for any link up to 150 km. Adjust the 810-QTX for link length as follows:

It is not necessary to connect fiber to the 810-QTX before adjusting the fiber-length setting.

1. Install the 810-QTX and supply power.

2. Check voltage at the fiber test point.

3. Convert voltage to kilometers:1 V at the test point = 10 km.

4. Turn the fiber-length adjustment potentiometer and monitor voltage at the test point until the number of volts corresponds with the actual link length.

• Turn clockwise to increase voltage for longer fiber length.

• Turn counterclockwise to decrease voltage for shorter fiber length.

Voltage readings (in parentheses) are taken at the Fiber Test Point. Factory settings are ± 5 km (0.5 V).

Removing a ModuleRemove a transmitter from the shelf as follows:

1. Turn laser key switch counterclockwise to turn off the laser. The LASER LED goes out (dark).

2. Lower the fiber-management tray by pulling down firmly on the tray’s front panel.

3. Unplug the fiber.

4. Install the cap in the bulkhead.

5. If you plan to leave the slot empty, disconnect the RF input cable(s). Use a 75-ohm, F-type terminator to terminate each cable. If you plan to fill this slot, do not disconnect input cable(s).


6. Release the module from the shelf by moving the handle slightly to the left (around the locking mechanism), and then pulling it towards you. Use the handle to pull the module out of the shelf.

7. Return the tray to the upright position.

End of Procedure.

Figure 57. Lock/Release MechanismMove handle around locking mechanism; then pull the handle.


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Specifications

200-TX Series Optical Transmitters

Notes:a. When used with a 2RRX.b. Depth includes shield.

Notes 200-TX UnitsBandwidth 5–200 MHzOptical Wavelength (all series) 1310 (± 10) nmOptical Output Power (all series)

210-TX 6 (± 0.25) dBm212-TX 8 (± 0.25) dBm214-TX 10 (± 0.50) dBm

Safety Power Shutdown (all series) YesRF Input Level, Main (20 channels) 18 (± 0.1 dB) dBmVRF Input Level, Auxiliary(± 0.5 dB) –10 dBmVIsolation, Auxiliary to Main Input –10 dBcAuxiliary Input Bandwidth (all series) 5-200 MHzAGC—Input Range (all series) ± 3 dBResponse Flatness (all series) a ± 0.75 dBResponse Slope (all series) 0 to +0.5 dBInput Impedance (all series) 75 ohmsInput Return Loss: 5–200 MHz (all series) 16 dBRF Test Point (± 1.0 dB) (all series) –20 dBCarrier-to-Noise Ratio (20 NTSC channels) See AM Optical Performance table.Composite Second Order (20 NTSC channels) See AM Optical Performance table.Composite Triple Beat (20 NTSC channels) See AM Optical Performance table.Optical Connector FC/APC, SC/APCRF Connector F-TypeDimensions (all series) (height x width x depth) b 4.75 x 1.81 x 16.25

(12.1 x 4.6 x 41.3)in.

(cm)Weight (all series) 3.5

(1.6)lb.

(kg)Power Consumption (all series) (maximum) 25 WPowering (all series, ± 0.5 V) +24, +5, –5 VDCAmbient Temperature (all series) See “Diamond Transport Operating Temperature

Range.”Thermal Shutdown for Laser 75

(167)°C

(°F)All specifications are subject to change without notice.


700-TX and 800C/E/G-TX Series Optical Transmitters

Notes:a. When used with a DT 801-FRX or NOR-860/21b. Depth includes shield

Notes 700-TX 800C-TX 800E-TX 800G-TX UnitsBandwidth

Operational 45–750 45–862 45–862 45–862 MHzAnalog 45–550 45–862 45–650 45–862 MHz

Optical Wavelength (all series) 1310 (± 10) nmOptical Output Power (± 0.25 dB)—all series

705-TX or 805*-TX 3 dBm706-TX or 806*-TX 4 dBm707-TX or 807*-TX 5 dBm709-TX or 809*-TX 6 dBm710-TX or 810*-TX 7 dBm711-TX or 811*-TX 8 dBm712-TX or 812*-TX 9 dBm713-TX or 813*-TX 10 dBm714-TX or 814*-TX 11 dBm715-TX or 815*-TX 12 dBm

Safety Power Shutdown (all series) YesInput RF power (± 0.1 dB)—Main

40 channels NTSC/42 channels CENELEC 18 18 — — dBmV60 channels NTSC 16 16 20 20 dBmV77 channels NTSC 15 15 19 19 dBmV94 channels NTSC — — 18 18 dBmV110 channels NTSC — 13 — — dBmV128 channels NTSC — 13 — 17 dBmV

Auxiliary Input550–862 MHz for 800C-TX (550–750 MHz on

700-TX), ± 0.5 dB relative to Main–10 –10 — — dB

45–862 MHz for 800E, 800G, ± 0.5 dB relative to Main — — –18 –18 dBIsolation, Auxiliary to Main Input — — –32 –32 dBcAGC—Input Range (all series) ± 3 ± 3 ± 3 ± 3 dBResponse Flatness (maximum, all series) a ± 0.75 dBResponse Slope (all series) a 0 to +0.5 dBInput Impedance (all series) 75 ohmsInput Return Loss

45–550 MHz 16 dB550–862 MHz (550–750 MHz on 700-TX) 15 dB

RF Test Point (± 1.0 dB) –20 dBCarrier-to-Noise Ratio (C/R) (all series) See AM Optical Performance table.Composite Second Order (CSO) (all series) See AM Optical Performance table.Composite Triple Beat (CTB) (all series) See AM Optical Performance table.Optical Connector (all series) FC/APC or SC/APCRF Connector—all models F-TypeDimensions (height x width x depth)—all models b 4.75 x 1.81 x 16.25

12.1 x 4.6 x 41.3in.

cmWeight—all models 3.5

1.6lb.kg

Power Consumption (maximum) (all series) 25 WPowering (all series) +24, +5, –5 VDCAll specifications are subject to change without notice.


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AM Optical Link Performance

5–200 MHz, 20 NTSC Channels

Notes:• Performance shown is for 20 NTSC channels (5–200 MHz) operating on a single

fiber (Corning SMF-28 or equivalent). For other channel allocation schemes, contact your Philips representative.

• Distortions are measured using CW carriers per NCTA recommendations by standard RF test methods.

• Noise is measured in a 4 MHz bandwidth.• Typical optical input power is –4 dBm for all models.• Transmitters operate within ambient temperature range of 0°C to 50°C (32°F to

122°F). Performance shown is 21°C (70°F) ambient; subtract 1 dB C/N for performance over full temperature range.

210-TX or 210A-TX

212-TX or212A-TX

214-TX or 214A-TX

Optical Output Power (dB) 6 8 10

Fiber Length (km) 15 20 35

Optical Loss Budget (dB)

Carrier-to-Noise (in dB) for links carrying 20 analog channels 5–200 MHz over a single fiber when

served by the listed 2**-TX transmitters

9 52 — —

10 51 — —

11 50 52 —

12 49 51 —

13 48 50 52

14 — 49 51

15 — 48 50

16 — — 49

All specifications are subject to change without notice.

–67 dB CTB (minimum, all models)–63 dB CSO (minimum, all models)


750 MHz, 77 NTSC Channels

Notes:• C/N values shown in boldboldboldbold are guaranteed. Other numbers are extrapolated and represent typical performance.• Performance shown is for standard 77 NTSC channel allocation (45–550 MHz) operating on a single fiber. For other channel

allocation schemes, contact your Philips representative.• Distortions are measured using CW carriers per NCTA recommendations by standard RF test methods. Performance shown

represents typical performance for ≥ 85% of production units tested over Corning SMF-28 fiber (or equivalent). For minimum CSO and CTB, subtract 2 dB from typical.

• Typical optical input power is –3 dBm for 709-TX through 715-TX series transmitters and –2 dBm for 705-TX through 707-TX series transmitters.

• Performance to a node is specified from the transmitter’s RF main input through receiver RF output. In the Diamond Net optical station, this is the NOR module. To determine link performance all the way to the housing outputs, add noise and distortion contributions of additional amplifier stages.

• Transmitters operate within ambient temperature range of 0°C to 50°C (32°F to 122°F). Performance shown is 21°C (70°F) ambient; subtract 1 dB C/N for performance over the full temperature range.

705-TX 706-TX 707-TX 709-TX 710-TX 711-TX 712-TX 713-TX 714-TX 715-TXOptical Output

Power (dBm) 3 4 5 6 7 8 9 10 11 12

Fiber Length (km) 6 10 10 15 15 15 15 15 20 20


Carrier-to-Noise (in dB) for links carrying 77 NTSC analog channels 45–550 MHz plus digital 550–750 MHz over a single fiber.

0 — — — — — — — — — —1 — — — — — — — — — —2 54.1 — — — — — — — — —3 53.5 54.1 — — — — — — — —4 52.8 53.5 54.1 — — — — — — —5 52.0 52.8 53.5 54.1 — — — — — —6 51.0 52.0 52.8 53.5 54.1 — — — — —7 49.9 51.0 52.0 52.8 53.5 54.1 — — — —8 48.7 49.9 51.0 52.0 52.8 53.5 54.1 — — —9 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.1 — —10 — 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.1 —11 — — 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.112 — — — 47.4 48.7 49.9 51.0 52.0 52.8 53.513 — — — — 47.4 48.7 49.9 51.0 52.0 52.814 — — — — — 47.4 48.7 49.9 51.0 52.015 — — — — — — 47.4 48.7 49.9 51.016 — — — — — — — 47.4 48.7 49.917 — — — — — — — — 47.4 48.718 — — — — — — — — — 47.4

All specifications are subject to change without notice.

–70 dB CTB (typical, all models)–65 dB CSO (typical, all models)


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862 MHz, 128 NTSC Analog Channels




• Typical optical input power is –3 dBm for 809C- or 809G-TX through 815C- or 815G-TX series transmitters and –2 dBm for 805C- or 805G-TX through 807C- or 807G-TX series transmitters.


• Transmitters operate within ambient temperature range of 0°C to 50°C (32°F to 122°F). Performance shown is 21°C (70°F) ambient; subtract 1 dB C/N for performance over full temperature range.

805C-TX805G-TX

806C-TX806G-TX

807C-TX807G-TX

809C-TX809G-TX

810C-TX810G-TX

811C-TX811G-TX

812C-TX812G-TX

813C-TX813G-TX

814C-TX814G-TX

815C-TX815G-TX

Optical Output Power (dBm) 3 4 5 6 7 8 9 10 11 12

Fiber Length (km) 6 10 10 15 15 15 15 15 20 20


Carrier-to-Noise (in dB) for links carrying 128 NTSC analog channels 45–862 MHz over a single fiber.

0 — — — — — — — — — —

1 — — — — — — — — — —

2 51.4 — — — — — — — — —

3 50.8 51.4 — — — — — — — —

4 50.1 50.8 51.4 — — — — — — —

5 49.3 50.1 50.8 51.4 — — — — — —

6 48.3 49.3 50.1 50.8 51.4 — — — — —

7 47.2 48.3 49.3 50.1 50.8 51.4 — — — —

8 46.0 47.2 48.3 49.3 50.1 50.8 51.4 — — —

9 44.7 46.0 47.2 48.3 49.3 50.1 50.8 51.4 — —

10 — 44.7 46.0 47.2 48.3 49.3 50.1 50.8 51.4 —

11 — — 44.7 46.0 47.2 48.3 49.3 50.1 50.8 51.4

12 — — — 44.7 46.0 47.2 48.3 49.3 50.1 50.8

13 — — — — 44.7 46.0 47.2 48.3 49.3 50.1

14 — — — — — 44.7 46.0 47.2 48.3 49.3

15 — — — — — — 44.7 46.0 47.2 48.3

16 — — — — — — — 44.7 46.0 47.2

17 — — — — — — — — 44.7 46.0

18 — — — — — — — — — 44.7All specifications are subject to change without notice.–70 dB CTB (typical, all models)–65 dB CSO (typical, all models)


862 MHz, 42 CENELEC Channels

Notes:• C/N values shown in boldboldboldbold are guaranteed. Other numbers are extrapolated and represent typical performance.• Performance shown is for standard 42 CENELEC channel allocation (45–862 MHz) operating on a single fiber. For other channel

allocation schemes, contact your Philips representative.• Distortions are measured using CW carriers per CENELEC recommendations by standard RF test methods. Performance shown


• Typical optical input power is –3 dBm for 809C- or 809G-TX through 815C- or 815G-TX series transmitters and –2 dBm for 805C- or 805G-TX through 807C- or 807G-TX series transmitters.



805C-TX805G-TX

806C-TX806G-TX

807C-TX807G-TX

809C-TX809G-TX

810C-TX810G-TX

811C-TX811G-TX

812C-TX812G-TX

813C-TX813G-TX

814C-TX814G-TX

815C-TX815G-TX


Fiber Length (km) 6 10 10 15 15 15 15 15 20 20


Carrier-to-Noise (in dB) for links carrying 42 CENELEC analog channels 45–862 MHz over a single fiber.

0 — — — — — — — — — —

1 — — — — — — — — — —

2 55.1 — — — — — — — — —

3 54.5 55.1 — — — — — — — —

4 53.8 54.5 55.1 — — — — — — —

5 53.0 53.8 54.5 55.1 — — — — — —

6 52.0 53.0 53.8 54.5 55.1 — — — — —

7 50.9 52.0 53.0 53.8 54.5 55.1 — — — —

8 49.7 50.9 52.0 53.0 53.8 54.5 55.1 — — —

9 48.4 49.7 50.9 52.0 53.0 53.8 54.5 55.1 — —

10 — 48.4 49.7 50.9 52.0 53.0 53.8 54.5 55.1 —

11 — — 48.4 49.7 50.9 52.0 53.0 53.8 54.5 55.1

12 — — — 48.4 49.7 50.9 52.0 53.0 53.8 54.5

13 — — — — 48.4 49.7 50.9 52.0 53.0 53.8

14 — — — — — 48.4 49.7 50.9 52.0 53.0

15 — — — — — — 48.4 49.7 50.9 52.0

16 — — — — — — — 48.4 49.7 50.9

17 — — — — — — — — 48.4 49.7



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862 MHz, 94 NTSC Analog Channels


allocation schemes, contact your Philips representative.• Distortions are measured using CW carriers per NTSC recommendations by standard RF test methods. Performance shown


• Typical optical input power is –3 dBm for 809E-TX through 815E-TX series transmitters and –2 dBm for 805E-TX through 807E-TX series transmitters.



805E-TX 806E-TX 807E-TX 809E-TX 810E-TX 811E-TX 812E-TX 813E-TX 814E-TX 815E-TX


Fiber Length (km) 6 10 10 15 15 15 15 15 20 20


Carrier-to-Noise (in dB) for links carrying 94 NTSC analog channels 45–650 MHz over a single fiber.

0 — — — — — — — — — —

1 — — — — — — — — — —

2 53.1 — — — — — — — — —

3 52.5 53.1 — — — — — — — —

4 51.8 52.5 53.1 — — — — — — —

5 51.0 51.8 52.5 53.1 — — — — — —

6 50.0 51.0 51.8 52.5 53.1 — — — — —

7 48.9 50.0 51.0 51.8 52.5 53.1 — — — —

8 47.7 48.9 50.0 51.0 51.8 52.5 53.1 — — —

9 46.4 47.7 48.9 50.0 51.0 51.8 52.5 53.1 — —

10 — 46.4 47.7 48.9 50.0 51.0 51.8 52.5 53.1 —

11 — — 46.4 47.7 48.9 50.0 51.0 51.8 52.5 53.1

12 — — — 46.4 47.7 48.9 50.0 51.0 51.8 52.5

13 — — — — 46.4 47.7 48.9 50.0 51.0 51.8

14 — — — — — 46.4 47.7 48.9 50.0 51.0

15 — — — — — — 46.4 47.7 48.9 50.0

16 — — — — — — — 46.4 47.7 48.9

17 — — — — — — — — 46.4 47.7



862 MHz, 77 NTSC Channels




• Typical optical input power is –3 dBm for 809E-TX through 815E-TX series transmitters and –2 dBm for 805E-TX through 807E-TX series transmitters.


• Transmitters operate within ambient temperature range of 0°C to 50°C (32°F to 122°F). Performance shown is 21°C (70°F) ambient; subtract 1 dB C/N for performance over the full temperature range.

805E-TX 806E-TX 807E-TX 809E-TX 810E-TX 811E-TX 812E-TX 813E-TX 814E-TX 815E-TXOptical Output

Power (dBm) 3 4 5 6 7 8 9 10 11 12

Fiber Length (km) 6 10 10 15 15 15 15 15 20 20


Carrier-to-Noise (in dB) for links carrying 77 NTSC analog channels 45–550 MHz plus digital 550–862 MHz over a single fiber.

0 — — — — — — — — — —1 — — — — — — — — — —2 54.1 — — — — — — — — —3 53.5 54.1 — — — — — — — —4 52.8 53.5 54.1 — — — — — — —5 52.0 52.8 53.5 54.1 — — — — — —6 51.0 52.0 52.8 53.5 54.1 — — — — —7 49.9 51.0 52.0 52.8 53.5 54.1 — — — —8 48.7 49.9 51.0 52.0 52.8 53.5 54.1 — — —9 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.1 — —10 — 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.1 —11 — — 47.4 48.7 49.9 51.0 52.0 52.8 53.5 54.112 — — — 47.4 48.7 49.9 51.0 52.0 52.8 53.513 — — — — 47.4 48.7 49.9 51.0 52.0 52.814 — — — — — 47.4 48.7 49.9 51.0 52.015 — — — — — — 47.4 48.7 49.9 51.016 — — — — — — — 47.4 48.7 49.917 — — — — — — — — 47.4 48.718 — — — — — — — — — 47.4

All specifications are subject to change without notice.–68 dB CTB (typical, all models)–64 dB CSO (typical, all models)


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DT-QTX Series QAM Transmitters

DT-210-QTX DT-810-QTX UnitsBandwidth 5 to 200 400 to 870 MHzOptical Wavelength 1549 to 1561 1530 to 1561 nmWavelength Deviation

Drift (maximum) 0.15 0.15 nmOffset (maximum) 0.01 0.01 nm

Optical Output Power (± 0.25 dB) 10 10 dBm

Safety Power Shutdowna yes yes

Input RF Power

20 Channelsb 24 — dBmV

33 Channelsc — 22 dBmV

Response Flatnessd ± 0.75 ± 0.75 dB

Response Scopee 0 to 0.5 0 to 0.5 dB

Input Impedance 75 75 ΩInput Return Loss

5 to 200 MHz -16 — dB400 to 650 MHz — -16 dB650 to 870 MHz — -15 dB

RF Test Pointf -20 (± 1) -20 (± 1) dB

Distortion Performance(@ 256 QAM unless otherwise noted)

See note g See note h

Carrier-to-Noise (typical) 46.0 43.5Composite Second Order (typical) 30 35Composite Triple Beat (typical) 45 45

Bit Error Rate ≤10-6 (23 QPSK) ≤ 10-6 (QAM 64i) ≤10-6 (QAM 16) ≤ 10-6 (QAM 256j)

Powering +24, +5.5, –5.5 (± 0.5) +24, +5.5, –5.5 (± 0.5) VDCPower Consumption (maximum) 25 25 WData Interface

Laser Shutdown Detect Y/N Y/NKeyswitch [on/off] Status Y/N Y/NTransmitter Safety Shutdown (Logic Input) +5 +5 V

Ambient Temperaturek 0 to 7532 to 167

0 to 7532 to 167

°C°F

Laser Bias Current 5 to 120 5 to 120 mALaser Bias Current Limit 130 130 mALaser Bias Current Limit Alarm Y/N Y/NLaser Output Power 2 to 10 2 to 10 mWLaser Internal Temperature 15 to 35

59 to 9515 to 3559 to 95

°C°F

Internal Temperature Alarm Y/N Y/NSpecifications are subject to change without notice.


Mechanical SpecificationsDimensions (height x width x depth) 12.1 x 4.6 x 41.3

(4.75 x 1.81 x 16.25)12.1 x 4.6 x 41.3

(4.75 x 1.81 x 16.25)cm

(in.)

RF Input Connector F-type F-typeOptical Connector SC/APC SC/APCRF Test Point Connector F-type F-typeFiber-Length Test Point Connector (DT-810-QTX only) N/A Multimeter Probe

Environmental SpecificationsAmbient Temperature 0 to 40 (32 to 104) 0 to 40 (32 to 104) °C (°F)Thermal Shutdown for Laser 75 (167) 75 (167) °C (°F)

a. Laser safety shutdown occurs when a TTL logic high is present. Transmitter internal switches (SW1 and SW2) are used to select the return receiver logic output. Do not use receiver position 17 for safety shutdown.

b. For digital channel loading in rated bandwidth. Test approximated with 20 NTSC CW channels at 5.5% OMI/channel in 5 to 200 MHz band.

c. For digital channel loading in rated bandwidth. Test approximated with 33 NTSC CW channels at 4.3% OMI/channel in 550 to 750 MHz band.

d. Peak-to-valley measured relative to best fit straight line over frequency range.e. Amplitude difference in frequency response relative to best fit straight line over frequency range.f. Variable attenuator set to 3.0 dB below minimum attenuation.g. Test setup in this sequence: DT-210-QTX, 50 km fiber, EDFA, 25 km fiber, return receiver (2RRX or RRX).h. Test setup: DT-810-QTX, 50 km fiber, EDFA, 50 km fiber, EDFA, 50 km fiber, receiver (801-FRX, 7-OR860/18, or NOR860/29/A.)i. A minimum of 23.5 dB Carrier-to-Noise Ratio is required to support 64 QAM at 10-6 per DOCSIS specification

SP-RFIv1.1-I03-991105.j. A minimum of 32 dB Carrier-to-Noise Ratio is required to support 256 QAM at 10-6 per DOCSIS specification

SP-RFIv1.1-I03-991105.k. Performance measures are relative to 25 oC (77 °F); typical operating temperature is 0 °C to 40 °C (32 °F- 104 °F). Higher

temperatures may cause transmitter wavelength to drift beyond the usable range of DWDM passives.

DT-QTX Series QAM Transmitters (Cont.)

DT-210-QTX DT-810-QTX Units

Specifications are subject to change without notice.


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Noise-Power Ratio (NPR) Charts (for the DT-210-QTX)

Figure 58. NPR–No EDFANPR curve for a return transmitter where the input to the receiver is –12 dBm, with no EDFA in cascade for a standard 42 MHz return loading for a 70 km link.

Figure 59. NPR–One EDFANPR curve for a return transmitter where the input to the receiver is –12 dBm, with one EDFA in cascade at –3.5 dBm input to the EDFA for a standard 42 MHz return loading for a 70 km link.


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