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(TI) 25th June 2007 Dwg. A01230
GDI COMMUNICATIONS LLC PO Box 1330 280 I-80 Exit 1
Verdi, NV 89439
Phone: (775) 345-8000 Fax: (775) 345-8010
Email: [email protected]
FDM2070-6D Fiber Optic Transceiver
for the 2070 Controller
USER GUIDE
FDM Series All Fiber Topologies - Compliant
25th June 2007 FDM2070-6D User Guide 1 Dwg: A01230
FDM2070-6D --- Table of Contents--- Page 1/2
FDM Series Overview 3
The FDM Series 3
FDM2SA 4
FDM170 4
FDM2070-6D 5
FDM FiberHub 5
FDM-FSK 5
FDM-SSR 5
Introduction to the FDM2070-6D 7
Basic Signal Flow Diagram 7
Sequence of Events 7
Modem Ergonomics 7
Front Panel Displays 8
Data Port Activity Displays 8
TXD LED’s 8
RXD LED’s 8
Data Port Anti- Streaming Alarm LED 8
Reset Switch 8
Data Ports 9
Intuitive Fiber Status Displays 9
Optical Ports 9
Bottom View 10
Side View 10
Understanding the DIP Switch Functions 11
Configuring the FDM2070-6D Modem 11
FDM DIP Switches 11
Master/Slave 11
Auxiliary Master Selection 11
Topology Selections 11
2 Rings 11
1 Ring 11
Daisy Chain 11
Data Protocol 12
RS232/485 12
Baud Rates 12
Parity 12
25th June 2007 FDM2070-6D User Guide 2 Dwg: A01230
FDM2070-6D -- Table of Contents--- Page 2/2
RTS/CTS Handshaking 12
CTS Delay 12
Anti-Streaming 13
Auxiliary Port DCE/DTE Options 13
1. Normal Operation at a Controller Location 13
2. DTE Operation at a Controller Location 14
Dynamic DCD and KOD Operation 15
DCD Static Operation 15
RS485 Buss, Signal Polarity Change 15
Fiber Topology Applications 17
1. Single String Daisy Chain (End Master) 17
2. Daisy Chain with a Center Master 18
Notes on Displays 19
Normal Fiber Identification (No Flashing Displays) 19
Fiber Alarm Notification (ALL Displays Flashing) 19
Single Fiber Break 19
3. Self Healing Dual Counter Rotating Ring Operation 20
Fold-back Condition 21
4. Single Ring Operation 22
Single Ring Display 23
5. Point to Point Operation 24
a) Point to Point with No Redundant Fiber Path 24
b) Point to Point With Redundant Fiber Path 25
Status Display 26
Installation Guide 27
How to Install a Daisy Chain:
a) All Fiber have been correctly identified 27
b) Installing on Unmarked Fibers using Fiber Identification 29
Installing a “Branch Fiber Modem” using Fiber Identification 32
Factory Default Settings 34
Optical Dynamic Range 35
Care and Handling Procedures for Optical Connectors 36
25th June 2007 FDM2070-6D User Guide 3 Dwg: A01230
FDM SERIES OVERVIEW
The FDM Series of Hardened Modems are designed for polling applications utilizing
RS232/485Asynchronous transmission over Multimode and Singlemode Fiber
Optics. All modems in the series are communications compatible with each other,
thus allowing greater flexibility of use.
The FDM Series comprise of six Digital Modems:
1. The FDM2SA is a Stand Alone version.
2. The FDM170 is a Plug-in version for the 170 Controller
3. The FDM2070-6D is a Plug-in version for the 2070 Controller
4. The FDM FiberHub performs as a 1 x 3 star optical hub that ties in
optical branch circuits into the mainstream communications path.
5. The FDM-FSK is a combination of a FDM2SA and a FSK modem.
6. The FDM-SSR is a combination of a FDM2SA and a Spread Spectrum
Radio.
The modems can operate in many different topologies, even on a simple fiber ring
when there is only one fiber available, later as more fibers become available,
simply flip a switch to change to the new topology.
This unique capability of operating in multiple topologies offers the advantage of
One Modem for all Topologies.
Switch Selectable Topologies are as follows:
• Single Fiber Ring
• Dual Fiber Redundant Ring (Self Healing)
• Point to Point
• Daisy Chain Format.
The modems have a high dynamic range yet they are immune to optical over
loads, therefore no optical attenuators are required for short runs or even bench
top “back to back” testing!
Any modem can be designated as a Master or Slave, also for Auto Restoration
any modem can be designated as an Auxiliary Master.
25th June 2007 FDM2070-6D User Guide 4 Dwg: A01230
FDM SERIES OVERVIEW continued
A unique and intuitive Dual Seven Segment display graphically indicates the
status of the fiber system, making diagnostics visually simple. All FDM series modems have the unique capability of Fiber Identification; the display will flash a
1 or 2 indicating which circuit the fiber belongs to.
Other advantages include multiple use Dual Data Ports enabling branch circuit
capabilities such as an On Street Master to Local Controller (same location), or
4wire or Spread Spectrum Radio communications.
All modems have the unique capability of having their Auxiliary Port switched
from DCE to DTE mode. This feature allows the Main port to drive the Aux-Port
as well as the fiber, primarily used for Street Master communications with the
local controller or driving some other modem.
Only FDM optical modems have the unique ability to generate a Carrier Detect
both before and after data flow, this is essential when connecting to 2 Wire FSK
communications. This Dynamic CD acts like a “DTE’s RTS” and is used to
initiate handshaking to a DCE’s RTS input.
The FDM Series represents a new generation of digital fiber optic modems
utilizing a Replaceable Operating System (ROS). As requirements change, or new
features become available, a new program can be loaded so as to provide a
migration path to upgrade the existing system.
FDM2SA
This is the “Stand Alone” version and has two Data Ports, one designated as the
Main Port, the other being an Auxiliary Port. The Main Data Port is used for
connection to a controller. The Auxiliary Data Port can be used for many
associated functions such as connecting to a Backup Server or for Over the Air
Restoration, or combining external data links into the polling stream.
A unique built-in Key on Data capability allows the fiber modem to act as DTE
and provide all necessary handshaking. This unique feature allows a Remote Fiber
System (Tail Circuit) to be integrated into a 4wire FSK circuit and on to city hall.
FDM170
25th June 2007 FDM2070-6D User Guide 5 Dwg: A01230
This is a Plug-In version for the 170 Series of Controllers and the R400/R800
Rack Series. The Main Data port is connected via the card edge connector to the
170 backplane while the Aux Data Port RJ45 is front accessible for combining
external data links in the polling stream.
For rack-mounted communications at the Traffic Maintenance Center, R400/R800
Series Racks can be populated with the FDM170 to complete the communications
system.
FDM2070-6D
This is a Plug-In version for the 2070 Series of Controllers. The Main and
Auxiliary Data ports provide the same functionality as in the FDM170, plus one
of the 2070’s spare Serial Ports SP2 or SP4 (slot dependant) is also brought out to
the front panel. For rack-mounted communications at the Traffic Maintenance
Center, R400/R800 Series Racks would be populated with the FDM170 to
complete the communications system.
FDM FiberHub
The FiberHub is designed to act like a hub or star that ties
four optical branch circuits together in a 1 x 3
A typically deployment would be anywhere in a fiber
arterial daisy-chain or ring at an intersection where it ties
in the “North/South” cross street optical branch circuits
into the “West/East” main arterial fiber run. As with all
FDM modems , data ports are provided for the local
controller and auxiliary communications.
FDM-FSK
The FDM-FSK is a combination of the FDM2SA
Fiber Optic Modem and GDI’s Model 4xx Series
FSK Modem, basically it is two interconnected
modems housed in the same enclosure. Two RS232
Data Ports are provided along with the 2/4 Wire
FSK Port, all three ports communicate to and from
the fiber to the originating “master source”.
FDM-SSR
The FDM-SSR is a combination of the FDM2SA Fiber Optic Modem and
SSR900FH Spread Spectrum Modem, basically it is two interconnected modems
N
W E
S
Fiber Trunk
Main
Port
Aux-Port
T1
R2T2
R1
2/4WirePort
Fiber Trunk
RS232 RS232 2/4 Wire
FSKModem
FDM2SAFiber Optic
Modem
FDM-FSK Modem
25th June 2007 FDM2070-6D User Guide 6 Dwg: A01230
housed in the same enclosure. Can be used for tying in orphaned intersections into
the fiber system or fiber to radio to fiber bridges and last mile applications.
FDM2070-6D
This User Guide describes the FDM2070-6D and its operation
25th June 2007 FDM2070-6D User Guide 7 Dwg: A01230
INTRODUCTION to the FDM2070-6D
Basic Signal Flow Diagram
Sequence of Events
• The Polling Data enters the Master’s Main or Auxiliary Port and is then broadcast
to the remote modems over the fiber optic transport layer.
• At each Remote FDM the Polling Data is passed to the Main and Auxiliary Data
Ports.
• Response Data entering the Remotes Main, Auxiliary is transmitted back to the
Master Modem.
• At the Master Modem, Response Data from the Remotes is passed to the Masters
Main and Auxiliary Ports and back to the Servers.
• RS232 access to the controller’s SP2 or SP4 (RS485) is also provided.
Modem Ergonomics
The Front Panel displays show information on the status of the FDM2070-6D,
also where the RS232 data and fiber interconnections are made.
All the switch-able options are located on the Bottom Panel to minimize ingress
of foreign material in roadside cabinet applications.
The Back panel is where the FDM2070-6D plugs into the controller.
On the Front Panel, there are two dual bulkhead Fiber Ports
which can be easily changed between ST, FC and SC style
connectors. The bulkheads are optically linked to the fiber
optic transceivers through short patchcords located inside
the protective enclosure.
Fiber Optic
Transceiver
Bulkhead
“Mini” Patchcords
25th June 2007 FDM2070-6D User Guide 8 Dwg: A01230
These inexpensive “mini” patchcords isolate the transceivers from the “outside
world” and provide them with 100% protection from being damage by external
dirty patchcords. Replacing the mini patchcords can be easily done by the
customer.
Front Panel Displays
The FDM2070-6D front panel is divided into three groups:
• The upper is for viewing Data Port Activity and
connection of a data equipment.
• The middle Section is for Fiber Status and Fiber
Identification.
• The lower section is the Fiber Optic Interface.
Data Ports and Activity Displays
This section displays the activity of data through the modem.
TXD LED’s This indicates data activity from the fiber to the data port.
RXD LED’s This indicates data activity from the data port to the fiber.
Data Port Anti-Streaming Alarm LED This indicates port data exceeded selected time out.
Reset Switch Switch for resetting Anti-Streaming Alarm.
MAIN DATA ALARM
RESET
ANTI-
STREAM
AUX DATA
TXD RXD
TXD RXD
R1
R2T2
T1
LOS
LOS
PWR
Fiber Satus
MAIN DATA ALARM
RESET
ANTI-
STREAM
AUX DATA
SERIAL
PORT
TXD RXD
TXD RXD
TXD RXD
FDM
2070-6D
GDINEVADA
Fail
R2
T1
T2
R1
MODEM
25th June 2007 FDM2070-6D User Guide 9 Dwg: A01230
Data Ports
The fiber optic modem has Dual RS232 Data Ports
(Main and Auxiliary), this is a single channel with
dual ports, The Main Data Port’s edge connector
plugs directly into the local controller’s buss, while
the Auxiliary RJ45 connector on the front panel can
be used to bring in auxiliary or radio based
communications into the main data stream.
The Serial Port converts RS232 signals at the front panels RJ45 to
RS485 on the edge connector for SP2 or SP4 communications.
Intuitive Fiber Status Displays
The seven segment displays show information as to the integrity of
the fiber system, each of the red segment lines represent the
incoming or outgoing fiber data path through the modem, while
LOS indicates a loss of incoming optical signal. This display is also
used for Fiber Identification to which determines which port the
fiber connects to.
See section Fiber Topology Applications on page 17
Optical Ports
The optical ports are dual hybrid adapters that are interchangeable
should a different style of connector such as ST, FC and SC be
required.
These hybrid adapters are coupled to the main optical transceivers
through replaceable mini patchcords that isolate and protect the main optics from
possible damage do to external dirty or damaged patchcords.
R1
R2T2
T1
LOS
LOS
PWR Fail
R2
T1
T2
R1
SERIAL
PORT
TXD RXD
Main
Data
Port
Aux Port
Serial Port
25th June 2007 FDM2070-6D User Guide 10 Dwg: A01230
Bottom View
The modem has an internal UPS system that if equipped with an
optional battery it will power the modem should power fail. The
modem will be fully operational until the batteries are depleted.
Resumption of power will start the battery charging process while
at the same time the modem will be fully operational.
The Battery On Off switch connects or disconnects the battery to
the modem. For shipping and storage purposes leave the switch in
the OFF position.
The DIP Switches on this panel defines how the modem will
operate such as will it be a Master or Slave or what Fiber
Topology do you want it operate over, as well as defining the
Data Parameters and do we need handshaking, anti-streaming
etc?
A full list of options and switch settings are described in the
section Understanding the DIP Switch Functions on page 11.
Side View
Pin out connection diagrams are included on this panel to assist the technician
when making interconnect cables.
MASTER
AUX-MASTER
2 RINGS
DAISY CHAIN
RS232
1200
2400
9600
19.2KBT/S
38.4KBT/S
57.6KBT/S
115.2KBT/S
PARITY
ODD
RTS-CTS
CTS-0ms
ANTI-STRM
2
4
8
16
32
64
AUX PORT DCE
(Normal)
SLAVE
OFF
1 RING
RING
RS485
OFF
OFF
NONE
EVEN
OFF
8ms
OFF
OFF
DIN
OFF ON
BATTERY
DTE
DYNAMIC DCD ON
DCD Set LOW HI
KOD OFF ON
Dynamic DCD Function
Set 1 & 3 to ON
RS-485 (+) (-)
Changes Signal Polarity
at 2070 Buss Interface
AuxPort
Serial Port
1 8
1 + 5VDC
2 DCD
3 N/C
4 GND
5 RXD
6 TXD
7 CTS
8 RTS
1 N/C
2 DCD/KOD
3 N/C
4 GND
5 RXD
6 TXD
7 CTS
8 RTS
GDI Communications LLCVERDI NEVADA 89439
775 345 8000
Fiber Digital Modem Series
FDM 2070-6D
AuxPort
Serial Port
1 8
1 + 5VDC2 DCD3 N/C
4 GND
5 RXD6 TXD7 CTS
8 RTS
1 N/C
2 DCD/KOD3 N/C4 GND
5 RXD
6 TXD7 CTS8 RTS
25th June 2007 FDM2070-6D User Guide 11 Dwg: A01230
Understanding the DIP Switches Functions
Configuring the FDM2070-6D Modem
You must configure the modem to your system requirements by using the DIP
Switches located on the bottom of the modem before you insert it into the 2070
Controller.
The following text explains the purpose of the function and where the switch is
located.
FDM DIP Switches
Master/Slave.
The modem at the “Head End” or “TMC” that connects into the
fiber system defines that it will be set as a Master, all other
modems shall be set as slaves.
Auxiliary Master Selection This switch selection is used for Alternate TMC Disaster Recovery scenarios,
otherwise set it to the OFF position. Typically a city works
yard would have an Emergency TMC, it is here that the local
modem would be set as an Auxiliary Master. Should a
catastrophe occur at the Primary Master Location, the
Auxiliary Master will automatically take over the operation of
the fiber system, then automatically hand back control when
the Primary TMC is back on line.
Topology Selections
Please note that you can have any combination of the following
topologies,
just mix or match, see section Fiber Topology Applications on
page 17 for examples.
1. 2 Rings (Self Healing Dual Counter Rotating Rings) This selection provides the best fault tolerant protection.
2. 1 Ring This selection is used when there is only one spare fiber
left to form a Single Ring
3. Daisy Chain This selection is for the classic Daisy Chain, leave the
previous switch set to 2 Rings and set the Master and
the last Slave to Daisy Chain.
1 RingRing
2 RingsDaisy Chain
SlaveMaster
OffAux. Master
25th June 2007 FDM2070-6D User Guide 12 Dwg: A01230
Data Protocol
RS232/485
Auxiliary Port’s Line Drivers Protocol can be switched to match
external requirements.
Although the Main Port (Card Edge) is fixed at RS485 to match
the controller’s Buss, the signal polarity may be switched.
See RS485 Buss, Signal Polarity Change
Baud Rates
The selectable Baud Rates are, 1200, 2400, 9600, 19.2Kbt/s,
38.4Kbt/s, 57.6Kbt/s and 115.2Kbt/s.
Parity
Parity can be set for None, Odd or Even.
Switch settings shown are Parity enabled and Even selected.
For no Parity select None.
RTS/CTS Handshaking
When Handshaking is turned Off, data arriving at either data
port from the attached devices will be transmitted over the fiber.
When Handshaking is turned On and RTS is high or raised,
data arriving at either data port from the attached devices will
be transmitted over the fiber. When RTS is low no data will
flow
CTS Delay
The RTS to CTS delay can be set at 0ms or 8ms, 0ms is for fast
operation and 8 ms is used for external transmission systems
that require a delay.
OffOffOffOffOffOffOff
24009600
38.4Kbts57.6Kbts
1200
19.2Kbts
115.2Kbts
Parity NoneOdd Even
RTS-CTS Off
CTS-0ms 8ms
RS485RS232
25th June 2007 FDM2070-6D User Guide 13 Dwg: A01230
Anti- Streaming
Anti-Streaming times 2, 4, 8, 16, 32, and 64 seconds, all are
switch selectable and are additive to a maximum of 126
seconds.
When RTS is raised the anti-streaming countdown timer starts,
at its conclusion the data to fiber path is inhibited and latched in
an open state, CTS is then lowered and the anti-streaming Alarm LED is lit.
Should RTS be lowered the system will automatically reset but the anti-streaming
alarm will remain lit indicating data timing violations from the
attached controller.
If the front panel anti- streaming RESET switch is momentary
pushed, the alarm LED will extinguish.
Auxiliary Port DCE/DTE Options
This selection is normally left in the DCE mode, see diagram below, but if
required the Auxiliary port can be driven from the Main port and appear as a
DTE, see 2 on next page..
Data Port Flow Diagrams
1. Normal Operation at a Controller Location.
(Aux Port switched to Normal Mode DCE)
When switched to DCE Mode the bi-directional signal flow originates from
the fiber to the Main and Auxiliary Ports, as the Main Port is connected to
Local Controller, the Aux Port can be connected to other modems such as a
4Wire FSK (DCE) or SS Radio (DCE). If handshaking is required see
Dynamic DCD and KOD Operation on page 15.
Ant-Strm Off248
1832
C-Mast 64 Off
DTEAux.Port DCE
MAIN DATA ALARM
RESET
ANTI-
STREAM
AUX DATA
TXD RXD
TXD RXD
Line
DriversFiber Optics Data Flow
Main Port
TXD
RXD
RTS
CTS
Aux Port (RJ45)
Co
mm
on
F
un
cti
on
Local
Controller2070(DTE)
S.S.Radio(DCE)
4Wire FSK
(DCE)
Card Edge Connector
Cable
FDM2070
Data Ports
6 TXD
5 RXD
8 RTS
7 CTS
25th June 2007 FDM2070-6D User Guide 14 Dwg: A01230
2. DTE Operation at a Controller Location.
(Aux Port switched to DTE Mode)
This feature allows the Main Port’s attached DTE device (On Street Master)
to drive the fiber and appear as a DTE at the Auxiliary Port.
The Auxiliary Port now looks like the On Street Master’s DTE port complete
with RTS/CTS Handshaking, this provides the necessary flow control for
driving 2wire FSK Modems.
DTEAux.Port DCE
Line
DriversFiber Optics Data Flow
Main Port
TXD
RXD
RTS
CTS
Aux Port (RJ45)
Local
Controller
2070
(DTE)
S.S.Radio
(DCE)
2/4Wire
FSK
(DCE)
Card Edge
Connector
Cable
FDM2070
Data Ports
6 TXD
5 RXD
8 RTS
7 CTS
25th June 2007 FDM2070-6D User Guide 15 Dwg: A01230
Dynamic DCD and KOD Operation
Some Controller Operating Systems require the Data Carrier
Detect (DCD) signal to indicate whether or not there is
incoming data. This is a dynamic signaling process of
asserting and de-asserting DCD as to whether or not data is
present. The FDM 2070-6D Fiber Optic Modem has special
circuitry that mimics this signaling process thus allowing
fiber communications instead of copper. Handshaking
originates from the fiber to the both the controller and
Auxiliary Port.
To activate this process, turn Dynamic DCD and KOD ON.
DCD Static Operation
If the Controller Operating System requires a Static DCD
signal then turn off Dynamic DCD and select either DCD
Set Low (De-asserted) or HI (Asserted) as required by the
Operating System.
RS485 Buss, Signal Polarity Change
Not all 2070 Controller Manufacturers have the same signal
polarity at the Buss Interface. To accommodate both
manufacturing camps we have included a switch-able
feature that selects either + or - signal polarity at the 2070
Buss Interface
DYNAMIC DCD ONDCD Set LOW HI
RS-485 (+) (-)
Changes Signal Polarityat 2070 Buss Interface
DYNAMIC DCD ON
KOD OFF ON
Dynamic DCD FunctionSet 1 & 3 to ON
Line Drivers
Fiber Optics Data Flow
TXD
RXD
6 TXD
5 RXD
RTS
CTS
Aux Port (RJ45)
8 RTS
7 CTSCo
mm
on
F
un
cti
on
Local Controller
2070(DTE)
2Wire FSK(DCE)
Card Edge Connector
Cable
FDM2070
Data Ports
2 DCD
Dynamic DCD
Dynamic DCD
DCD
RTS
2 Wire
25th June 2007 FDM2070-6D User Guide 17 Dwg: A01230
Fiber Topology Applications
1. Single String Daisy Chain (End Master)
This configuration is used when there is no fiber ring available, only one pair of
fibers available from controller to controller, a typical application would be a
TMC or Street Master feeding an arterial string and terminating at the far end.
Normal Display (No Flashing Displays)
Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the
modems to operate at 9600baud 8N1, this is a typical setting for the traffic
industry, all other switch positions not shown are in the Off position or “other
selection”.
Anti-Streaming is “always off” at a Master, end modems are set to Daisy Chain.
Modem Dip Switch Settings Master Modem Middle Slaves End Slave
Master Slave Slave Slave
2 Ring 2 Ring 2 Ring 2 Ring
Daisy Chain * Ring Ring Daisy Chain *
RS232 RS232 RS232 RS232
9600 9600 9600 9600
None None None None
RTS/CTS RTS/CTS RTS/CTS RTS/CTS
CTS-0ms CTS-0ms CTS-0ms CTS-0ms
Off Anti-Stream Anti-Stream Anti-Stream
N.A. 2 Seconds 2 Seconds 2 Seconds
Aux Port Normal Aux Port Normal Aux Port Normal Aux Port Normal
T1
FDM
Master
R2
TMC
Computer
DATA R1
FDM
Slave 1
RTU /
Controller
T1
R2 T2
RTU /
Controller
FDM
Slave 2
FDM
Slave 3
RTU /
Controller
T1 R1 R1
R2 T2 T2
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
25th June 2007 FDM2070-6D User Guide 18 Dwg: A01230
T1 R1 End Slave
RTU /
Controller
Master Middle
Slave(s) End Slave
RTU /
Controller
RTU /
Controller
T1 T1 R1 R1
R2 R2 R2 T2 T2 T2
TMC
Computer
DATA
2. Daisy Chain with a Center Master
The “Center” Master Modem can be located anywhere in the Daisy Chain. In
some scenario’s, the TMC may not be at the beginning, but somewhere in the
“middle” of the arterial daisy chain. The above layout shows how to connect
modems to both sides of the master.
Normal Display ( No Flashing Displays)
Note at the Master Modem you need to switch it to “Center Master” by selecting
C-Mast 64 as well as Daisy Chain., note all end modems have Daisy Chain
selected.
Anti- Streaming is not used at a Master location.
Modem Dip Switch Settings End Slave Master Modem Middle Slaves End Slave Modem
Slave Master Slave Slave
2 Ring 2 Ring 2 Ring 2 Ring
Daisy Chain * Daisy Chain * Ring Daisy Chain *
RS232 RS232 RS232 RS232
9600 9600 9600 9600
None None None None
RTS/CTS RTS/CTS RTS/CTS RTS/CTS
CTS-0ms CTS-0ms CTS-0ms CTS-0ms
Anti-Stream Off Anti-Stream Anti-Stream
2 Seconds C-Mast 64 * 2 Seconds 2 Seconds
Aux Port Normal Aux Port Normal Aux Port Normal Aux Port Normal
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterEnd Slave
25th June 2007 FDM2070-6D User Guide 19 Dwg: A01230
Notes on Displays
Normal Fiber Indication (No Flashing Displays)
With all the modems installed and communicating at the fiber level no flashing of
the fiber displays will take place, this is because we have end to end continuity
and have terminated the first and last modem. If we have a break or loss of fiber
signal on any input or leave the line unterminated, which is the same as a LOS, all
fiber modems will flash to alert the technician of an abnormal condition.
Fiber Alarm Notification (All Displays Flashing)
Here we show a cable cut somewhere in the mid span Slaves, this results in
isolating the downstream modems from the polling Master.
Note the LOS alarms on the modems adjacent to the cut, this indicates that the
break is between the two modems; also note the “fold-back symbol” indicates the
modem has communications to its adjacent modems but not across the break. The
down-stream isolated modems are in communications with each other and will
automatically come back on line when the break is repaired.
Single Fiber Break
Here we have a single fiber break between T1 on one modem to R1 on the next
modem, this is indicated by a flashing LOS at R1, in this case the problem is
likely a broken patchcord at either end of the fiber. The other fiber modem shows
no LOS as it is receiving a good signal,
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
Indicates “Fiber Communications” aregood on this segment.
Fold-Back indicationIndicates “Fiber Communications” are
good on this segment.
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
No LOS
25th June 2007 FDM2070-6D User Guide 20 Dwg: A01230
3. Self Healing Dual Counter Rotating Ring Operation
This format requires that two fibers to be connected from modem to modem until
a dual counter-rotating ring is formed. The advantage of this format is that if there
is a fiber cut between any modems or a modem failure, the adjacent modems
straddling the malfunction will automatically fold back into Ring 2 causing the
system to self heal by forming a new ring. See Foldback illustration on the next
page.
Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the
modems to operate at 9600baud 8N1, this is a typical setting for the traffic
industry, all other switch positions not shown are in the Off position or “other
selection”.
Master Modem Slave Modem
Master Slave
2 Rings 2 Rings
RS232 RS232
9600 9600
None (Parity) None (Parity)
RTS/CTS RTS/CTS
CTS-0ms CTS-0ms
Off Anti-Stream
2 Seconds
Aux Port Normal Aux Port Modem
R1
T1
T1
T1
T1
R1
R1
R1
FDM
Slave 1
FDM
Slave 2
FDM
Slave 3
TMC
Computer
RTU /
Controller
Dual Counter Rotating Ring
Format
RTU /
Controller
RTU /
Controller
FDM
Master
R2
R2
R2 T2
T2
T2
T2
R2
RING 1
RING 2
25th June 2007 FDM2070-6D User Guide 21 Dwg: A01230
Foldback Condition
Under normal conditions all the modems would have a static
display showing a two-ring operation.
With a failure of any Slave or a cable cut, the adjacent modems would fold back
to form a new ring, thus maintaining communications. Next a message is sent to
all the other modems in the system to flash their displays once a second to
indicate a ring fold-back has taken place. The above diagram shows a catastrophic
event at Slave 2, with the resulting graphics displays below.
T1
R2
R1
T2
LOS
LOS
Normal
Fiber Status
T1
R2
R1
T2
LOS
LOS
Slave 3
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
FDMMaster
Slave 1
Fold-Back indication Indicates “Fiber Communications”
are good in this segment.Fold-Back indication
R1
T1
T1
T1
T1
R1
R1
R1
FDM Slave 1
FDM Slave 3
DATA
See Ring Status Displays Below
R 2
R2
R2
T2
T2
T2
T2
R2
RING 1
RING 2 RTU /
Controller RTU /
Controller
TMC Computer
FDM Master
FDM Slave 2
RTU /Controller
R1 T1
25th June 2007 FDM2070-6D User Guide 22 Dwg: A01230
R1
T1
T1
T1
T1
R1
R1
R1
FDM
Slave 1
FDM
Slave 2
FDM
Slave 3
TMC
Computer
DATA
RTU /
Controller
Single Fiber
Loop
RTU /
Controller
RTU /
Controller
FDM
Master
4. Single Ring Operation
This configuration is useful when there is only one fiber available from modem to
modem, it has the lowest security of all configurable systems, should the ring be
broken then the system will collapse.
Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the
modems to operate at 9600baud 8N1, this is a typical setting for the traffic
industry, all other switch positions not shown are in the Off position or “other
selection”.
Master Modem Slave Modem
Master Slave
1 Ring 1 Ring
RS232 RS232
9600 9600
None None
RTS/CTS RTS/CTS
CTS-0ms CTS-0ms
Off Anti-Stream
2 Seconds
Aux Port Normal Aux Port Normal
25th June 2007 FDM2070-6D User Guide 23 Dwg: A01230
Single Ring Display
In the Single Ring mode, all the displays will be static until
there is a break in the ring, when this condition occurs all
displays will flash, the modem that has lost it’s input will
flash a Loss Of Signal alarm (LOS)
The following displays indicate a progressive build out of a Single Ring.
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
T1R1
LOS
Master
Master
Master
Master
Slave 1
Slave 1 Slave 2
Slave 1 Slave 2
T1R1
LOS
Slave 1
25th June 2007 FDM2070-6D User Guide 24 Dwg: A01230
5. Point to Point Operation
a) Point to Point with No Redundant Fiber Path
In this situation we only have two fibers available, so we create a single ring, all
operations and indications will be the same as the previous single ring setup.
Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the
modems to operate at 9600baud 8N1, this is a typical setting for the traffic
industry, all other switch positions not shown are in the Off position or “other
selection”.
Master Modem Slave Modem
Master Slave
1 Ring 1 Ring
RS232 RS232
9600 9600
None None
RTS/CTS RTS/CTS
CTS-0ms CTS-0ms
Off Anti-Stream
2 Seconds
Aux Port Normal Aux Port Normal
FDM
Master
Modem
FDM
Slave
Modem
Host
Computer
TMC
RTU /
Controller
T1
T2 R2
R1 T1 R1
T2 R2
Data Data
Fiber Path
25th June 2007 FDM2070-6D User Guide 25 Dwg: A01230
b) Point to Point with Redundant Fiber Path
The above shows a single Point to Point System with fail safe redundant fiber
optics, if the primary path fails then the system will automatically run on the
secondary (redundant) path. The best system security is obtained by running two
separate cables following different paths, one cable has T1/R2 fibers and the other
has R1/T2, if one cable is completely severed the system will automatically
recover via the other cable.
Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the
modems to operate at 9600baud 8N1, this is a typical setting for the traffic
industry, all other switch positions not shown are in the Off position or “other
selection”.
Master Modem Slave Modem
Master Slave
2 Ring 2 Ring
RS232 RS232
9600 9600
None None
RTS/CTS RTS/CTS
CTS-0ms CTS-0ms
Off Anti-Stream
2 Seconds
Aux Port Normal Aux Port Normal
FDM
Master
Modem
FDM
Slave
Modem
Host
Computer
TMC
RTU /
Controller
T1
R2 T2
R1 T2 R2
R1 T1
Cable 2
Data Data
Cable 1
Fiber
T1
R2
R1
T2
LOS
LOS
Fiber Status
Normal
T1
R2
R1
T2
LOS
LOS
Fiber Status
Normal
25th June 2007 FDM2070-6D User Guide 26 Dwg: A01230
Status Display
A failure of any receive fiber would cause the following fold-back
indication to be displayed.
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
T2
T1
R2
R1
LOS
LOS
LOS
LOS
T1
R2
R1
T2
LOS
LOS
Fiber Status
Normal
T1
R2
R1
T2
LOS
LOS
Fiber Status
Normal
25th June 2007 FDM2070-6D User Guide 27 Dwg: A01230
Installation Guide
How to Install a Daisy Chain
a) All Fibers have been Correctly Identified
Let’s assume that we are installing a Daisy Chain down an arterial roadway, the
first modem would be set as a Master and all other modems set as Slaves. At each
end of the system you will have only two fibers, and at all locations in between
there will be four fibers, two from downstream and two from upstream, all fibers
have marked patchcords installed identifying which fiber/cable it is attached to.
Using the preceding chart as a guide, all the modems have been set up with the
correct working parameters; the first and last modem is set to Daisy Chain.
Master Location
Starting at the Master location, plug in the modem that has been set up as Master
and connect the patchcords into T1 and R2. Note that only R2 shows a LOS
alarm, this is because you have set the first modem to Daisy Chain, this terminates
the unused side and therefore no alarms or displays will appear for this side. At
this point we are transmitting on T1 and receiving nothing on R2, the next step is
at Slave 1 location.
Slave 1 Location
Step 1
At the Slave 1 location, plug in the Slave Modem, you will notice that both LOS
lights will be flashing due to no signal inputs.
R1
R2T2
T1LOS
LOS
Master
Fiber Optic
Cable
R1
R2T2
T1LOS
LOS
Master
Fiber Optic
Cable
R1
R2T2
T1LOS
LOS
Slave 1
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
25th June 2007 FDM2070-6D User Guide 28 Dwg: A01230
Step 2
Connect the patchcord R1, note that the LOS alarm turns off due to the modem
detecting the signal from the upstream Master.
Step 3
Connect the patchcord T2, note the fold-back sign appears, this indicates that
Slave 1 modem has synchronized with the proceeding modem (Master) and
created a return path thus providing optical communications. The display will
flash.
At the Master the display will have changed to indicate as it has synched up
with the Slave modem, whilst the other side is blank indicating it is not in use
(terminated). The displays will flash. At this juncture if the Master was polling
Slave 1, bi-directional data communications should now take place and the data
lights will flash accordingly.
As we have not installed Slave 2 we still have a valid LOS alarm on R2.
Install the two remaining patchcords T1 and R2.
Slave 2 Location
Repeat steps 1 through 3 at this and all mid slave locations; note how the
preceding Slave modem’s display shows that it has synched up with modems on
either side indicating upstream and downstream fiber circuits are connected
through. The displays will flash.
R1
R2T2
T1LOS
LOS
Master
R1
R2T2
T1LOS
LOS
Slave 1
R1
R2T2
T1LOS
LOS
Master
R1
R2T2
T1LOS
LOS
Slave 1
R1
R2T2
T1LOS
LOS
Slave 1
R1
R2T2
T1LOS
LOS
Slave 2
R1
R2T2
T1LOS
LOS
Master
25th June 2007 FDM2070-6D User Guide 29 Dwg: A01230
End Slave
As with the first modem (Master), the last modem (Slave) is also “terminating”
the lines so we set it to Daisy Chain. The display will show a flashing LOS for R1
but blank for R2 as this is the terminated side. When the R1 patchcord is
connected and the signal is received the LOS will extinguish, next we connect T2
patchcord and the modem will synch up with the preceding modem.
The display will now indicate and no longer flash; the installation is now
complete.
b) Installing on Unmarked Fibers using Fiber Identification
In situations where the fibers are not identified, the modem has the unique ability
of identifying whether a fiber has Receiver 1 or Receiver 2 traffic by flashing the
message 1 or 2 to denote which receiver that fiber belongs to.
Using this feature allows us to quickly and correctly route all the fibers.
Let’s assume that we are installing a Daisy Chain down an arterial roadway, the
first modem would be set as a Master and all other modems set as Slaves.
At each end of the system you will have only two fibers, and at all locations in
between there will be four fibers, two from downstream and two from upstream.
Using the preceding chart as a guide, all the modems have been set up with the
correct working parameters; the first and last modem is set to Daisy Chain.
R1
R2T2
T1LOS
LOS
Slave 1
R1
R2T2
T1LOS
LOS
Slave 2
R1
R2T2
T1LOS
LOS
Master
R1
R2T2
T1LOS
LOS
End Slave
T1
R2
R1
T2
A B
LOS
LOS
R2
Display indicates patchcord belongs in R2.
T1
R2
R1
T2
A B
LOS
LOS
R1
Display indicates patchcord belongs in R1.
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
25th June 2007 FDM2070-6D User Guide 30 Dwg: A01230
Master Location
Step 1
Starting at the Master location, plug in the modem that has been set up as Master
and then connect patchcords from T1 and R2 into the fiber optic cable. Note that
only R2 shows a LOS alarm, this is because you have set the first modem to
Daisy Chain, this terminates the unused side and therefore no alarms or displays
will appear for this side. At this point we are transmitting on T1 and receiving
nothing on R2, the next step is at Slave 1 location.
Slave 1 Location
Step 1
At the Slave 1 location, plug in the Slave Modem, you will notice that both LOS
lights will be flashing due to no signal inputs.
Step 2 Next connect one end of a patchcord into R2 and then start
cycling the other end through all four ports on the patch panel
until you see the modems display indicates “1”. This is
indicating that this fiber belongs to R1 on the Modem.
Step 3 Remove this fiber from R2 and insert into R1, the 1 disappears
along with R1 LOS.
Step 4 The remaining three patchcords are then rotated through T2
until you see R1/T2 fold-back flashing. This modem is now
synced up with the preceding upstream modems and is online
with its controller.
R1
R2T2
T1LOS
LOS
Master
Fiber Optic
Cable
R1
R2T2
T1LOS
LOS
Master
Fiber Optic
Cable
R1
R2T2
T1LOS
LOS
Slave 1
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
25th June 2007 FDM2070-6D User Guide 31 Dwg: A01230
Step 6
At the Master the display will have changed to indicate as it has synched up with
the Slave modem, whilst the other side is blank indicating it is not in use
(terminated). The displays will flash. At this juncture if the Master was polling
Slave 1, bi-directional data communications should now take place and the data
lights will flash accordingly.
As we have not installed Slave 2 we still have a valid LOS alarm on R2.
Install the two remaining patchcords from T1 and R into the downstream fiber
optic cable.
At all other slave locations, except the End Slave, repeat Slave 1 setup.
End Slave Location
As with the first modem (Master), the last modem (Slave) is also “terminating”
the lines so we set it to Daisy Chain. The display will show a flashing LOS for R1
but blank for R2 as this is the terminated side.
Connect a patchcord to R1 and cycle through the two fiber ports on the patch
panel until R1 LOS extinguishes. Connect another patchcord between T2 and the
remaining fiber port and the modem will now synch up with the preceding
modem.
The display will now indicate and no longer flash; the installation is now
complete.
R1
R2T2
T1LOS
LOS
Master
R1
R2T2
T1LOS
LOS
Slave 1
T1
R2
R1
T2
LOS
LOS
Middle Slave (s)
T1
R2
R1
T2
LOS
LOS
T1
R2
R1
T2
LOS
LOS
End Slave
T1
R2
R1
T2
LOS
LOS
FDM
MasterMiddle Slave (s)
25th June 2007 FDM2070-6D User Guide 32 Dwg: A01230
Installing a “Branch Fiber Modem” using Fiber Identification
Let’s assume we are at a new location that has been inserted into an existing working
system. In the Main Fiber Optic Cable, the two working fibers between the Existing
Slaves have been cut at the Splice Box location thus producing four fiber ends.
These fiber ends were then spliced into four fibers in the new Branch Fiber Optic
Cable. At the New Slave location these four fibers each terminate at a fiber port
inside a patch panel. The four fiber ports have not been marked to identify whether
they are from the upstream or downstream cable or whether they are transmit or
receive fibers.
The following method uses the Fiber Identification technique to quickly determine
the correct fiber patching between the patch panel and the modem. The following
example we will use Receiver 2 as our detector.
Before inserting the modem make sure that it has been set up correctly.
Step:
1. Plug the modem into the controller, note R1 and R2 LOS
LED’s are flashing due to no input.
2. Next connect one end of a patchcord into R2 and then start
cycling the other end through all four ports on the patch panel
until you see the modems display indicates “1”. This is
indicating that this fiber belongs to R1 on the Modem.
3. Remove this fiber from R2 and insert into R1, the 1 disappears
along with R1 LOS.
4. The remaining three patchcords are then rotated through T2
until you see R1/T2 fold-back flashing. This modem is now
synced up with the preceding upstream modems and is online
with its controller.
New
Slave
FDM2070
Existing
Slave
FDM2070
Existing
Slave
FDM2070
Main Fiber Optic Cable Main Fiber Optic Cable
Splice Box
Branch
Fiber Optic Cable
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
25th June 2007 FDM2070-6D User Guide 33 Dwg: A01230
5. The remaining two patchcords are then cycled through R2 until
you see R2 LOS disappear.
6. The remaining patchcord is inserted into T1 and the display
now stop flashing which indicates that the modem is passing
both up and downstream fiber traffic.
R1
R2T2
T1LOS
LOS
R1
R2T2
T1LOS
LOS
25th June 2007 FDM2070-6D User Guide 34 Dwg: A01230
Factory Default Settings
All FDM2070-6D Plug-in Modems are shipped from the factory with the
following DIP Switch settings enabled.
Data Port Pin Out Assignments
Serial Port Auxiliary Port
Pins Serial Port DCE Data Flows Auxiliary Port DCE Data Flows
1 +5V NC
2 DCD Out DCD Out
3 NC NC
4 GND GND Common
5 RXD Common RXD Out
6 TXD TXD In
7 CTS In CTS Out
8 RTS Out RTS In
Anti-Streaming times are additive,
e.g. 2 + 4 = 6 seconds
(max. time 126 sec)
SlaveOff1 RingRing
OffOffOffOffOffOffOff
Parity NoneOdd Even
RTS-CTS OffCTS-0ms 8msAnt-Strm Off
248
1832
C-Mast 64 OffDTE
Master
2 RingsDaisy Chain
RS232
24009600
38.4Kbts57.6Kbts
Aux. Master
1200
19.2Kbts
115.2Kbts
Aux.Port DCE
DYNAMIC DCD ONDCD Set LOW HI
KOD OFF ON
Dynamic DCD Function
Set 1 & 3 to ON
RS-485 (+) (-)
Changes Signal Polarity
at 2070 Buss Interface
25th June 2007 FDM2070-6D User Guide 35 Dwg: A01230
Optical Dynamic Range
For any system to work reliably there must be adequate signal level at the
receiver. The modem must have a larger Dynamic Range, expressed in db, than
the cables end to end attenuation (db).
All Singlemode FDM series have 25DB of dynamic range.
Steps necessary to determine reliable operation,
1. Determine if your fiber is Multi-Mode or Single Mode.
2. Using an Optical Power Meter measure the End to End Attenuation of
your fiber pair, including all patchcords at the operating wavelength.
3. Add a minimum of 3db safety margin to this figure.
4. The Dynamic Range must be larger than the overall attenuation obtained
in step 3 for reliable operation.
Mode Operating Wavelength Dynamic Range Model #
Singlemode 1300nm SM Laser 25db FDM Series
25th June 2007 FDM2070-6D User Guide 36 Dwg: A01230
GDI Communications LLC Technical Services Bulletin #1
CARE AND HANDLING PROCEDURES FOR
OPTICAL CONNECTORS Author TONY ILETT
Cleanliness Is Very Important When Handling Fiber Optics Specs of dust which are invisible to the human eye, oil or grease from fingers can
contaminate the end surfaces of an optical connector and reduce it’s coupling efficiency to
the point of causing a system to fail.
To put things into perspective the end face of an optical connector is 2.5mm in diameter. In
the center of this is our optical wave-guide or glass fiber; this has a diameter of 125 microns
(125 millionth of a meter) and is about the size of a human hair. In the center of this glass
fiber is an area called the Core, which in Multimode fiber is 50 or 62.5microns in diameter
and is invisible to the naked eye, it is this core that carries our optical signal.
As stated Multimode core diameters are usually 50 microns (Europe) or 62.5 microns (North
America), but in the long haul, high bandwidth world of Singlemode fibers the core size is
80% smaller than the fibers diameter of 125 microns and measures less than 10 microns
across!
It should now be obvious that a spec of dust, invisible the naked eye, can prevent your
communications system from working, so: ------ KEEP IT CLEAN!
Materials needed to clean Optical Patchcords
1. Wet Method
Typically these are lens grade tissue pre-moistened with a solvent that has a
concentration of 90% or better of Isopropyl Alcohol and sealed in a foil sachet.
or
A lens grade tissue, which is then moistened with 90% or better Isopropyl
Alcohol. Do not use rubbing alcohol as this contains oil for lubrication and will
leave a smear or film which will degrade the Optical Return Loss and also cause
particulate matter to stick to it.
or
Dry Method
This involves using a special device that looks like a small videocassette tape
containing a paper like material instead of magnetic tape. The connectors ferrule
is inserted into an opening and the tape is wound on thus polishing the end face.
There are several versions of this device readily available from supply houses.
25th June 2007 FDM2070-6D User Guide 37 Dwg: A01230
Note: This only polishes the end surface and does not clean the ferrules
cylindrical surface that contributes to axial alignment.
2. Air Duster
A can of compressed inert gas with a plastic extension tube. Make sure that any liquid
propellant has been discharged from the tube before using on the optics.
3. Lint Free Tissues
Lint free tissues used to clean fiber optic surfaces. Does not introduce any
contaminates. Always keep sealed in a Ziploc bag to avoid contamination when not
in use. Do not re-use the tissue, discard it.
4. Dust Caps
A supply of Clean Dust Caps, note that there are two sizes, one for connectors, the
other one is slightly smaller and is used for the optical ports on patch-panels and
transmission devices. Store them in a Clean Zip-Lock Bag.
The following scenario outlines the steps taken when disconnecting and then re-mating
one end of a Patchcord from an optical device, such as a patch-panel or transmission
equipment.
WARNING!
Invisible Laser Energy Can Damage Your Eyes
• Do not look into the end of an Optical Connector that is attached to a
fiber, it may be emitting potentially harmful energy that can damage
your eyes, first disconnect the other end or turn the power “Off” on the
transmitting device.
• Do not look into the transmitting port of an Optical Transmitter with out
first turning the power “Off” to that device.
Note:
Visible Red LED’s (820nm Multimode) are low power devices that can be
viewed at a safe distance of two to three feet.
Disconnecting the Optical Connector
1. Any accumulation of dust that has settled around the optical connectors must first be
removed by using short bursts of compressed air from the Air Duster. In high dust
areas use pre-moistened tissues or lint free tissues moistened with alcohol to wipe off
25th June 2007 FDM2070-6D User Guide 38 Dwg: A01230
excessive dust and then use the Air Duster, this will reduce the possibility of dust
contaminating the optical connector as well as the optical receptacle.
Do not re-use a tissue, discard it. 2. Disconnect the optical connector and put a clean protective dust cap over the end.
If you don’t have a dust cap use a clean Ziploc bag or worst case temporary suspend
the connector in free air and make sure it does not touch any other surface.
Do not leave the exposed receptacle without any protection; cap it with a clean dust
cap!
Reconnecting the Optical Connector
1. Remove the dust cap from the end of the optical connector (if fitted) and store in a
clean Ziploc bag for future use at this site.
Do not touch the ferrules surfaces with your fingers!
2. Using the Air Duster, use short bursts to clear any dust from the connector,
particularly from the ferrule area.
3. Remove the Optic Prep Wipe from a sealed sachet and start the cleaning process.
Do not put the wipe down on any surface as this will contaminate it and render it useless. Using this clean pad, clean the end face of the ferrule and its
circumference. Do not be afraid to apply pressure when cleaning, use the same
pressure as if you were cleaning eyeglasses.
4. Using the Air Duster, use a single short burst to clean and dry the ferrule before
starting the re-connecting process. Do not touch the ferrule again as you might
contaminate it.
5. Remove the dust cap from the mating receptacle and store in the clean Ziploc bag
for future use.
6. Hold the connector locking mechanism between thumb and forefinger. Allow the
little finger to steady the hand by holding it against the chassis or patch-panel
during the insertion process. With the little finger in contact with the panel, there
is a reduced chance of the ferrule touching any contaminated non-mating
surfaces.
7. Insert the ferrule into the receptacle and slowly rotate the connector until the key
aligns itself with the receptacles keyway, then push the connector home and
engage the connectors locking mechanism.
Do not force the connector; it should be a snug fit.
FDM Insert
FDM Series of Fiber Optic Modems
• Multiple Fiber Topologies in One Modem Single Ring, Dual Redundant Rings, Daisy Chain and Point to Point.
• Combination Fiber Optic and FSK Modems Built in FSK Modems for 2/4 wire Copper and Fiber Applications.
• Intuitive Fiber Status Display
Pictorially indicates the switching status of the modem.
• Fiber Identification
Display shows a 1 or 2 to indicate which port the fiber belongs.
• Generates DTE Handshaking
Necessary for Remote Fiber to 2/4Wire FSK to TMC applications.
• Auxiliary Data Port
For 2/4Wire FSK or SS Radio Branch Circuits.
• Built-in Uninterruptible Power Supply
Provides Optical Continuity at a Failed Intersection.
AUXPORT
RJ45
1 RI
3 DTR2 CD
4 SG
RXD 5 TXD 6CTS 7RTS 8
MODEL FDM170GDI Communications LLC
Verdi NV 89439775-345-8000
IN
OUT
R1T2
T1
R2
MODEM
FIBER STATUS
PWR
FAIL
1 8
ENABLE
DISABLE BAT
TER
Y
AU
X C
ON
N
FDM2SA
GDI Communications
TXD
RXD
Data PortsKOD RTS
Anti-Strm
Reset
T1
R2
R1
T2
LOS
LOS
MainDC Power Center
Battery
Alarm Charging
RING 2
RING 1
R1
R2T2
T1
LOS
LOS
PWR
RING STATUS
MAIN DATA ALARM
RESET
ANTI-STREAM
AUX DATA
SERIAL PORT
TXD RXD
TXD RXD
TXD RXD
FDM
2070-6D
GDINEVADA
Fail
R2
T1
T2
R1
FDM2SA
FDM170
FDM2070
FDM-FiberHub
R1 T2
GDI Communications
TXD
RXD
Link Activity
Data Port Anti- Streaming
TXD
RXD
Alarm Reset
AB CD
D
T1
R2
R1
T2
T1 R2
A B
CLOS
LOS
LOS
LOS
MainDC Power Center
Battery
Alarm Charging
FDM-FiberHub
FDM-FSK
GDI Communications
TXD
RXD
Data PortsKOD RTS
Anti-Strm
Reset
T1
R2
R1
T2
LOS
LOS
MainDC Power Center
Battery
Alarm Charging
CD
RTS
2/4 Wire FSKKOD
CTS
TXD RXD
A B
FDM-FSK
Stand Alone Models Plug-in Models for Controllers and Racks
25th June 2007 FDM2070-6D User Guide 39 Dwg: A01230
Contents of this user guide may not be copied or published without the written consent of GDI Communications LLC, Verdi, Nevada.
The contents of this user guide are deemed to be correct at the time of publishing and are offered as a guide only; GDI
Communications LLC is not liable for any inaccuracies or omissions.