ITA703FMmaterias.fi.uba.ar/6679/apuntes/4300_ita703.pdfA special hardware kit, RM-9, for mounting standalone units into a 19" rack can be ordered separately. This hardware enables

ITA-703G.703 Rate and Interface Converter

Installation and Operation Manual

Notice

This manual contains information that is proprietary to RAD Data Communications. No part of thispublication may be reproduced in any form whatsoever without prior written approval by RAD DataCommunications.

No representation or warranties for fitness for any purpose other than what is specifically mentioned inthis manual is made either by RAD Data Communications or its agents.

For further information contact RAD Data Communications at the address below or contact your localdistributor.

RAD Data CommunicationsHeadquarters12 Hanechoshet StreetTel Aviv 69710 IsraelTel: 972-3-6458181Fax: 972-3-6498250E-mail: [email protected]

RAD Data CommunicationsUS East900 Corporate DriveMahwah, NJ 07430 USATel: (201) 529-1100Fax: (201) 529-5777E-mail: [email protected]

RAD Data CommunicationsUS West3631 South Harbor BoulevardSuite 250Santa Ana, CA 92704Tel: (714) 850-0555Fax: (714) 850-1555

© 2000 RAD Data Communications Publication No. 321-200-06/00

WarrantyThis RAD product is warranted against defects in material and workmanship for a period of one yearfrom date of shipment. During the warranty period, RAD will, at its option, either repair or replaceproducts which prove to be defective. For warranty service or repair, this product must be returned toa service facility designated by RAD. Buyer shall prepay shipping charges to RAD and RAD shall payshipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, dutiesand taxes for products returned to RAD from another country.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenanceby Buyer, Buyer-supplied firmware or interfacing, unauthorized modification or misuse, operationoutside of the environmental specifications for the product, or improper site preparation ormaintenance.

Exclusive Remedies

The remedies provided herein are the Buyer’s sole and exclusive remedies. RAD shall not be liable forany direct, indirect special, incidental, or consequential damages, whether based on contract, tort, orany legal theory.

Safety WarningsThe exclamation point within a triangle is intended to warn the operator orservice personnel of operation and maintenance factors relating to theproduct and its operating environment which could pose a safety hazard.

Always observe standard safety precautions during installation, operation and maintenance of thisproduct. Only a qualified and authorized service personnel should carry out adjustment, maintenanceor repairs to this instrument. No adjustment, maintenance or repairs should be performed by either theoperator or the user.

Telecommunication Safety

The safety status of each of the ports on the ITA-703 is declared according to EN 41003 and is detailedin the table below:

Ports Safety StatusDTE SELV Circuit operating with Safety Extra-Low VoltageG.703 TNV-1 Circuit whose normal operating voltage is within

the limits of SELV, on which overvoltages fromTelecommunications Networks are possible.

Regulatory Information

FCC-15 User Information

This equipment has been tested and found to comply with the limits of the Class A digital device,pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection againstharmful interference when the equipment is operated in a commercial environment. This equipmentgenerates, uses and can radiate radio frequency energy and, if not installed and used in accordancewith the instruction manual, may cause harmful interference to the radio communications. Operationof this equipment in a residential area is likely to cause harmful interference in which case the user willbe required to correct the interference at his own expense.

Warning per EN 55022

This is a Class A product. In a domestic environment, this product may cause radio interference, inwhich case the user may be required to take adequate measures.

Declaration of Conformity

Manufacturer’s Name: RAD Data Communications Ltd.

Manufacturer’s Address: 12 Hanechoshet St.Tel Aviv 69710Israel

declares that the product:

Product Name: ITA-703

Conforms to the following standard(s) or other normative document(s):

EMC: EN 55022 (1994) Limits and methods of measurement of radio disturbancecharacteristics of information technology equipment.

EN 50082-1 (1992) Electromagnetic compatibility – Generic immunity standardsfor residential, commercial and light industry.

Safety: EN 60950 (1992/93) Safety of information technology equipment, includingelectrical business equipment.

Supplementary Information:

The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the LowVoltage Directive 73/23/EEC. The product was tested in a typical configuration.

Tel Aviv, July 2nd, 1998

Haim KarshenVP Quality

European Contact: Rad Data Communications GmbH, Berner Strasse 77, 60437 Frankfurt am Main, Germany

ITA-703 Installation & Operation Manual i

Contents

CHAPTER 1 INTRODUCTION1.1 Overview ....................................................................................................................... 1-11.2 Physical Description....................................................................................................... 1-21.3 Functional Description ................................................................................................... 1-3

G.703 Interface .................................................................................................................... 1-3Rate Adaptor ........................................................................................................................ 1-4Async/Sync Converter and V.54 Circuits ................................................................................ 1-4Transmit FIFO....................................................................................................................... 1-4RS-232 Interface ................................................................................................................... 1-4

1.4 Technical Specifications ................................................................................................. 1-6G.703 Interface .................................................................................................................... 1-6DTE Interface........................................................................................................................ 1-6Test Switches / Diagnostics .................................................................................................... 1-6G.703 Timing Elements......................................................................................................... 1-7LED Indicators ...................................................................................................................... 1-7Physical ................................................................................................................................ 1-7Power Supply ....................................................................................................................... 1-8Line Protection ..................................................................................................................... 1-8Environment ......................................................................................................................... 1-8

CHAPTER 2 INSTALLATION AND SETUP2.1 Introduction ................................................................................................................... 2-12.2 Site Requirements and Prerequisites .............................................................................. 2-12.3 Package Contents........................................................................................................... 2-12.4 Mechanical Installation................................................................................................... 2-2

Mechanical Assembly............................................................................................................ 2-2

2.5 Electrical Installation....................................................................................................... 2-2Strap Selection...................................................................................................................... 2-2Setting of Internal Jumpers and Switches ............................................................................... 2-2Connecting the DTE Interface................................................................................................ 2-4Connecting the G.703 Interface ............................................................................................ 2-5Power Connection ................................................................................................................ 2-6

CHAPTER 3 OPERATION3.1 General.......................................................................................................................... 3-13.2 Front Panel Indicators and Switches ............................................................................... 3-13.3 Operating Instructions.................................................................................................... 3-3

Power-On Procedure ............................................................................................................ 3-3Activation of Tests................................................................................................................. 3-3Power-Off Procedure............................................................................................................ 3-3

3.4 Reconfiguring ITA-703 ................................................................................................... 3-4

Table of Contents

ii ITA-703 Installation & Operation Manual

CHAPTER 4 TESTS AND DIAGNOSTICS4.1 General.......................................................................................................................... 4-14.2 V.54 Loop Tests ............................................................................................................. 4-1

Local Analog Loopback (LLB) ................................................................................................ 4-2Remote Digital Loopback (RLB)............................................................................................. 4-3Local Digital Loopback (DIG) ................................................................................................ 4-3

4.3 ITA-703 Self-Test............................................................................................................ 4-4

CHAPTER 5 CARD CAGE VERSION5.1 ASM-MN-214 Card Cage ............................................................................................... 5-15.2 ITA-703/R Card Version ................................................................................................. 5-25.3 Power Supply................................................................................................................. 5-3

AC Supply ............................................................................................................................ 5-4DC Supply ............................................................................................................................ 5-4Power Supply with Redundancy............................................................................................ 5-4

5.4 Installation ..................................................................................................................... 5-5

APPENDIX A V.24/RS-232 INTERCONNECTION

APPENDIX B UNIT CASE ASSEMBLY

Table of Contents

ITA-703 Installation & Operation Manual iii

List of FiguresFigure 1-1 Typical ITA-703 Application......................................................................................... 1-1Figure 1-2 Front View of ITA-703 ................................................................................................. 1-2Figure 1-3 ITA-703 Block Diagram................................................................................................ 1-3Figure 1-4 ITA-703 Synchronization Option ................................................................................. 1-4Figure 1-5 Clock Diagram............................................................................................................. 1-5Figure 1-6 Clock Configuration ..................................................................................................... 1-5Figure 2-1 ITA-703 Board Layout.................................................................................................. 2-3Figure 2-2 ITA-703 Rear Panel...................................................................................................... 2-5Figure 3-1 ITA-703 Front Panel..................................................................................................... 3-1Figure 4-1 Local ITA-703 in Analog Loopback (LLB)...................................................................... 4-2Figure 4-2 Local ITA-703 in Remote Digital Loopback (RLB)......................................................... 4-3Figure 4-3 Local ITA-703 in a Digital Loopback ............................................................................ 4-4Figure 4-4 ITA-703 Self-Test ......................................................................................................... 4-4Figure 5-1 ASM-MN-214 Rear Panel ............................................................................................ 5-2Figure 5-2 ITA-703/R Front Panel ................................................................................................. 5-3Figure 5-3 ASM-MN-214 Front Panel ........................................................................................... 5-4Figure B-1 Installation of a Single Unit .......................................................................................... B-2Figure B-2 Installation of Two Units (a) ......................................................................................... B-3Figure B-3 Installation of Two Units (b) ......................................................................................... B-3

List of TablesTable 2-1 ITA-703 Strap Selection ................................................................................................ 2-4Table 2-2 RJ-45S Pin Assignments................................................................................................. 2-5Table 3-1 ITA-703 Controls and Indicators.................................................................................... 3-2Table A-1 DTE Interface Signal Assignments.................................................................................. A-1

List of Tables

iv ITA-703 Installation & Operation Manual

12-08-98 13:36 Overview 1-1

Chapter 1Introduction

1.1 Overview

ITA-703 is a rate and interface converter allowing low-speed V.24equipment to be connected to a G.703 codirectional (64 kbps) interface.This conversion enables connection of low-speed data channels to the PCMnetwork. The rate conversion is performed according to ITU I.463 (V.110)and I.460 standards. This rate conversion also enables access to ISDNterminal adaptors through the telecommunication network.

Figure 1-1 shows a typical application of ITA-703.

Async

19.2 kbps

G.703

64 kbps

G.703

64 kbps

ASCII Terminal ITA-703 ITA-703

VAX

PCMNetwork

Figure 1-1 Typical ITA-703 Application

ITA-703 operates synchronously or asynchronously, converting V.24 rates upto 19.2 kbps. For async rates of 600 bps and higher, the async-to-syncconversion is compatible with ITU V.14. For async rates lower than 600 bps,ITA-703 operates in synchronous mode at 19.2 kbps and multi-samples thedata.

Operating full duplex at a transmission rate of 64 kbps, ITA-703 has a rangeof up to 800m (1/2 mile) from the G.703 equipment. The high-speedtransmit timing source is strap-selectable for either recovered clock from theG.703 interface, external timing from the V.24 interface, or internal timing.

ITA-703 features V.54 diagnostic capabilities for performing local loopbacks(analog and digital) and remote digital loopback. When in the digitalloopback mode, the operator at either end of the line may test both unitsand the line. The loopbacks are controlled either by front panel pushbuttons or by pins 18 and 21 of the V.24/RS-232 interface.

All V.24 configuration parameters such as bit rate, bit length, and sync/asynccan be selected at each ITA-703 unit. Alternatively, parameters can beselected at a master ITA-703, and downline loaded from the master to aslave ITA-703.

Chapter 1 - Introduction ITA-703 Installation & Operation Manual

1-2 Physical Description 12-08-98 13:36

The control signals RTS and DTR are passed through end-to-end to DCD orDSR, respectively, in compliance with ITU V.110. DSR can be optionally setseparately to be continuously ON.

ITA-703 is coupled to the G.703 4-wire interface line through isolationtransformers which, in conjunction with other circuitry, protect against ACor DC overvoltages. The protection circuitry enables operation even whenDC is connected to the line.

ITA-703 is available in two versions: ITA-703/SA (standalone desktop unit)and ITA-703/R (rack-mount card for the ASM-MN-214 rack). For descriptionof the rack-mount version, see Chapter 5.

1.2 Physical Description

The ITA-703 standalone device is shown in Figure 1-2. Its front panelcontains control switches and LED indicators for controlling and monitoringits operation. For detailed description of the front panel, see Chapter 3.

The rear panel contains power and interface connectors. For detaileddescription, see Chapter 2.

A special hardware kit, RM-9, for mounting standalone units into a 19" rackcan be ordered separately. This hardware enables installation of either oneor two units side by side (see Appendix B).

Figure 1-2 Front View of ITA-703

ITA-703 Installation & Operation Manual Chapter 1 - Introduction

12-08-98 13:36 Functional Description 1-3

1.3 Functional Description

This section contains functional description of the ITA-703 circuit blocks.The ITA-703 block diagram in shown in Figure 1-3 below.

TRANS-MITFIFO

TD

E.CK

RD (LOW SPEED)

TC & RC

HIGHSPEED

V.1 10SYNC LOSS

TD

INT

ASYNC/SYNCCONVERTER

ANDV.54

CIRCUITSRXD

TXC 64 kHz

RXD

TXC TXC

LOW -SPEEDCLOCK

RD

TD

TEST

RATEADAPTER

RECEIVEFIFO

G.703INTERFACE

INTERNAL

EXTERNAL RECEIVE

G.703SYNC LOSS

Figure 1-3 ITA-703 Block Diagram

G.703 Interface The G.703 interface on the transmit side converts the analog transmit signalto a three-level signal, and inserts a bipolar violation every block of eightbits (according to the G.703 standard). On the receive side, the interfaceprovides the digital signal (from the received analog signal) synchronizedwith the violation signal. If no violation signal is received, the G.703 SYNCLOSS indicator lights up.

The G.703 interface also provides one of three rate adaptor timing sources:

• Internal (a free-running crystal oscillator)

• Receive (synchronized with the received G.703 signal)

• External (synchronized with the low speed clock provided by the DTE onPin 24)

Note The system needs one master clock. If one unit is set to Internal/Externalclock, the other unit must be set to Receive clock (or RCVB if needed). RCVBis a special option provided for cases in which the timing source is theReceive clock, but the incoming low speed data is synchronized according tothe External clock. In such cases, external synchronization between the G.703network and the local DTE must be provided, as shown in Figure 1-4.


1-4 Functional Description 12-08-98 13:36

Figure 1-4 ITA-703 Synchronization Option

Rate Adaptor The rate adaptor implements the ITU V.110 (I.463) standard. The RTS andDTR control signals and incoming low speed data are transmitted on theline (at 64 kHz) in frames. The receive side of the block checks theincoming frames and sends the relevant data to the low speed channel. Ifthe unit loses synchronization on the received frames, the V110 SYNCLOSS indicator lights up. The RTS and DTR signals are passed through asDCD and DSR.

The rate adaptor also provides the low speed transmit and receive clock.

Async/SyncConverter andV.54 Circuits

If the DTE is an async type, an async/sync conversion is provided (asdescribed in the V.22 standard). The V.54 circuits send and receive thepattern in order to provide the remote digital loop in the local or theremote unit.

Transmit FIFO The transmit FIFO compensates for phase differences if the unit issynchronized to the external low speed clock provided on Pin 24 (DTEtiming). It is also used when ITA-703 is synchronized with the receivedG.703 signal, as shown in Figure 1-4, and the DTE provides the clock(Transmit Clock set to RCVB - see Table 2.1). In this case the DTE and thedigital transmission system must be externally synchronized.

RS-232 Interface The RS-232 interface module provides a standard voltage conversion toV.24/RS-232 levels.

Notes 1. In order to enable the DCD and RD signals on the remote unit, the localRTS signal must be in the ON state.

2. If the unit is not synchronized according to V.110 (I.463), the CTS, DSRand DCD pins are in the OFF state.


12-08-98 13:36 Functional Description 1-5

Figure 1-5 Clock Diagram

Figure 1-6 Clock Configuration


1-6 Technical Specifications 12-08-98 13:36

1.4 Technical Specifications

G.703 Interface Interface Codirectional 64 kbps

Line 4-wire

Connectors RJ-45S or terminal block

Range Up to 800m (1/2 mile) over 24 AWG

Impedance 120Ω balanced

Balance Better than 45 dB (up to 256 kHz)

Return loss Better than 20 dB (up to 256 kHz)Better than 14 dB (up to 384 kHz)

Clock frequency 64 kHz

Frequency tracking ±500 ppm

“Pulse” amplitude 1.0V nominal

“Zero” amplitude 0V±0.1V max

DTE Interface Type RS-232/V.24

Format Sync or async, full duplex

Data rates 600, 1200, 2400, 4800, 7200, 9600, 14400,19200 bps

Character length in asyncmode

Selectable 8, 9, 10, 11 (includesStart+Stop+Parity+Character bits)

Control signals RTS, DTR, DCD, DSR, CTS are passedthrough according to ITU I.463. DSR may beset to constantly ON (strap-selectable).

Connector 25-pin D-type, female

Test Switches/Diagnostics

Complies with the V.54 Standard

Digital loopback Local (DIG): Activated by a manualswitch.Remote (REM): Activated by a manual switch

or by the DTE interface signal(pin 21).

Analog loopback Local (ANA): Activated by a manual switch or by the DTE


12-08-98 13:36 Technical Specifications 1-7

interface signal (pin 18).

G.703 TimingElements

Transmit clock Derived from 3 alternative sources:- Internal oscillator- External from the DTE (pin 24) low speed

clock- Loop clock derived from the receive signal,

looped back as a transmit clock

Low speed clock The DCE low speed timing signal (pins 15and 17) is derived from the 64 kHz clock.

LED Indicators PWR Power

RTS Request to Send

TD Transmit Data

RD Receive Data

TEST Test

SYNC LOSS G703 - on G.703 interfaceV110 - on incoming data frame

Physical ITA-703 Standalone Unit

Height 44 mm / 1.7 in

Width 193 mm / 7.6 in

Depth 242 mm / 9.5 in

Weight 1.4 kg / 3.1 lb.

ITA-703-1 Card VersionDimensions Fit the ASM-MN-214 card cage

Weight 360 g / 0.73 lb

ASM-MN-214 Card CageHeight 178 mm / 7.0 in

Width 480 mm / 19.0 in

Depth 216 mm / 8.5 in

Weight 4.0 kg / 8.8 lb (without power supplies andmodem cards)


1-8 Technical Specifications 12-08-98 13:36

Power Supply Voltage 115 or 230 VAC ± 10%

Frequency 50 or 60 Hz

Power 3W

Fuse 0.1A slow-blow

Line Protection AC/DC overvoltage protection, connected via transformers to transmit andreceive telephone lines (or coaxial cable).

Environment Temperature 0 - 50°C / 32 -122°F

Humidity 0 to 90%, non-condensing

12-08-98 14:28 Mechanical Installation 2-1

Chapter 2Installation and Setup

2.1 Introduction

This chapter provides instructions for mechanical and electrical installationof the ITA-703 standalone model. (For the installation of the ITA-703/R cardin the ASM-MN-214 card cage, see Chapter 5).

Sections 2.2 and 2.3 describe site preparation and mechanical installation ofthe unit.

Section 2.4 describes electrical installation, including strap selection, settingthe internal jumpers and switches, and connection of power and interfacesto the unit.

After completing installation, refer to Chapter 3 for operating informationand system checkout to ensure proper operation.

2.2 Site Requirements and Prerequisites

Install ITA-703 within 1.5m (5 feet) of an easily accessible grounded ACoutlet. The outlet should be capable of furnishing the voltage in accordancewith the rated voltage of the unit.

Allow at least 90 cm (36 in) of frontal clearance for operating andmaintenance accessibility. Allow at least 10 cm (4 in) clearance at the rear ofthe unit for signal lines and interface cables.

2.3 Package Contents

The ITA-703 package includes the following items:

• The ITA-703 unit

• The ITA-703 Installation and Operation Manual

• The AC power cord.

Chapter 2 - Installation ITA-703 Installation & Operation Manual

2-2 Electrical Installation 12-08-98 14:28

2.4 Mechanical Installation

MechanicalAssembly

ITA-703 is a standalone device designed for tabletop or bench installation. Itis delivered completely assembled. No provision is made for bolting the unitto the tabletop. For installation of a the unit into a 19” rack, see Appendix B.

2.5 Electrical Installation

To complete the installation of ITA-703, you must perform the following (inthe given order):

• Determine the required configuration of ITA-703, according to yourapplication, and set the internal jumpers and switches accordingly.

• Connect the DTE and line interfaces.

• Connect power to the unit.

Strap Selection Before connecting power to the unit, determine the required configurationof ITA-703 and position the straps accordingly. The PCB strap locations ofFigure 2-1 correspond to the numbers in Table 2-1.

Warning

To avoid accidental electric shock, disconnect the power cord beforeremoving the unit from its casing.

Setting of InternalJumpers andSwitches

1. Loosen the two screws located at the lower corners of the rear panel.

2. Slide the unit out of its casing.

3. Adjust the jumpers and switches as required, according to Table 2-1.

4. Reinstall the unit in the casing and tighten the retaining screws.

ITA-703 Installation & Operation Manual Chapter 2 - Installation

12-08-98 14:28 Electrical Installation 2-3

BAUD

R

ATE (kbps)

TC

G703

INT

EXTR

CV

RC

VB

DSR

SWITCH

BITS

PIN 21 PIN

18

ON

REM

ENDIS

EN

DIS

0-0.61-1.22-2.43-4.84-7.15-9.66-14.47-19.2

S1 M

S

S2 ASYN

C

SYNC

S3/S4

8

9

10

11

1234

3

5

4

2

17

6

Figure 2-1 ITA-703 Board Layout



Table 2-1 ITA-703 Strap Selection

Ident.Number

StrapIdentity

Function PossibleSettings

FactorySetting

1 BAUDRATE(kbps)

Selects the low speed data rate 0 - 0.61 - 1.22 - 2.43 - 4.84 - 7.25 - 9.66 - 14.47 - 19.2

3

2 DSR Provides a steady space (ON) independently of the remoteDTR or reflects the remote DTR.

ONREM

ON

3 TCG.703

Selects the transmit clock (64 kHz) from either: internalclock (INT), receive clock (RCV), external clock (EXT) orreceive clock plus FIFO active for transmit data with DTEtiming provided (RCVB).

INTEXTRCVRCVB

RCV

4 PIN 21 Enables remote loopback from the DTE ENDIS DIS

5 PIN 18 Enables local loopback from the DTE ENDIS DIS

6 DIPSwitches

S1 - Selects if the unit works according to its own(“Master”) configuration for baud rate, sync/async and bitlengths or according to the remote unit (“Slave”).

S2 - Provides an async/sync conversion

S3/S4 - Character length (includes start bits + stopbits+parity)

M ↑S ↓

ASYNC ↑SYNC ↓

8 ↑↓9 ↑↓10 ↑↓11 ↑↓

M

ASYNC

11

6 SWITCH Enables the activation of front panel push buttons ENDIS

EN

Note If the DTE does not provide the test pins for analog and remote loopback, thecombined jumper for pins 18 and pin 21 must always be set to DIS.

Connecting theDTE Interface

The DTE side (see Figure 2-2) provides interface for input/output data, clockand control signals between ITA-703 and the DTE. The DTE interface has aV.24/RS-232 connector.

ITA-703 Installation & Operation Manual Chapter 2 - Installation

12-08-98 14:28 Electrical Installation 2-5

XMT RCV GND

~230V/F-0.1A S.B.

DTE Pin1

Figure 2-2 ITA-703 Rear Panel

To connect ITA-703 to the DTE, use a standard cable which you can ordereither from RAD (CBL-HBT/V24) or from another provider. In order to fullycomply with ESD requirements, make sure that Pin 1 of the cable is earthedat the far end.

Connecting theG.703 Interface

The G.703 Interface has either a RJ-45S connector or a terminal blockconnector (see Figure 2-2).

RJ-45S Connector

The pin assignments for the RJ-45S connector are as follows:

Table 2-2 RJ-45S Pin Assignments

Pin Function

2 Shield (Chassis Ground)

3 Receive

4 Transmit

5 Transmit

6 Receive

In order to fully comply with ESD requirements, make sure that pin 2 isearthed at the far end.

Terminal Block

The terminal block provides four connecting points to the transmit andreceive twisted pair lines and a fifth one for ground connection. In order tocomply with ESD requirements, the terminal block is covered by a metalcover plate, which must not be removed unless you have to connect theterminal block to G.703 equipment.



To connect the G.703 equipment to the terminal block, proceed as follows:

Warning

Do not touch bare line wires.

1. Unscrew the two screws connecting the cover plate to the unit andremove the cover plate.

2. Connect the transmit pair to the terminals marked XMT (data output ofthe converter), and the receive pair to the terminals marked RCV (datainput to the converter).

3. Connect the GND terminal externally to earth.

4. Reinstall the cover plate in its place.

Power Connection AC power is supplied to ITA-703 through a standard 3-prong plug withintegral fuse holder (see Figure 2-2).

The rated fuse for the unit is 230V / 0.1A slow-blow for 230V and115V / 0.1A slow-blow for 115V.

Warning

This unit should always be grounded through the protective earth leadof the power cable.

Before connecting power to this unit, verify that the socket outlet isprovided with a protective earth contact. If you are using an extensioncord (power cable) make sure it is grounded as well.

Interrupting the protective (grounding) conductor (inside or outside theunit), or disconnecting the protective earth terminal can make this unitdangerous.

The line fuse is located in an integral-type fuse holder on the rear panel(as shown in Figure 2-2). Make sure that only fuses of the requiredrating, as marked on the rear panel, are used for replacement. Do notuse repaired fuses or short-circuit the fuse holder. Always disconnectthe mains cable before removing or replacing the fuse.

Whenever it is likely that the fuse protection has been damaged, makethe unit inoperative and secure it against unintended operation.

To connect power to the unit, simply connect its power cord to the powersupply socket.

12-08-98 13:55 Front Panel Indicators and Switches 3-1

Chapter 3Operation

3.1 General

This chapter describes the ITA-703 controls and indicators and theirfunctions, and explains the operating procedures.

Installation procedures given in Chapter 2 must be completed and checkedbefore attempting to operate ITA-703.

3.2 Front Panel Indicators and Switches

All controls (push-button switches) and LED indicators are located on theITA-703 front panel (see Figure 1-3). Pressing a push button turns the controlON. Releasing the button turns the control OFF. Tables 3-1 and 3-2 indicatethe functions of push buttons and LED indicators, respectively. Item lettersand numbers listed in the tables correspond to the identification labels inFigure 3-1.

REMANADIGV110

SYNC LOSS

G703TSTRDTDRTSPWR

Figure 3-1 ITA-703 Front Panel

Chapter 3 - Operation ITA-703 Installation & Operation Manual

3-2 Operating Instructions 12-08-98 13:55

Table 3-1 ITA-703 Controls and Indicators

No Name Type Function

1 PWR LED Indicator(green)

ON when power is on.

2 RTS LED Indicator(yellow)

ON when the DTE activates Request to Send.

3 TD LED Indicator(yellow)

ON when steady space is being transmitted.Flickers when data is transmitted.

4 RD LED Indicator(yellow)

ON when steady space is being received.Flickers when data is received.Not active on digital loop, while receiving remote loop.

5 TST LED Indicator(red)

ON when the unit is in any of the three loopback modes.

6 SYNC LOSSG703

LED Indicator(red)

OFF for normal operation.ON if violations are not present on receive signal.

7 SYNC LOSSV110

LED Indicator(red)

OFF for normal operation.ON if synchronization is lost on more than three consecutiveframes on the incoming G.703 signal.

8 DIG Push button Activates a Local Digital Loopback switch, which causes thelocal ITA-703 unit to loop line-received data to its transmitter(see Figure 4-3). DSR and RD go low.

9 ANA Push button Activates a Local Analog Loopback (V.54 Loop 2) switch,which causes the local unit to loop its DTE input back to itsoutput (see Figure 4-1). The transmitter continues to senddata to the line. This loopback may also be activated fromthe DTE when pin 18 is set to “EN”.

10 REM Push button Activates a Remote Digital Loopback (V.54 loop 3) switch,which causes the remote unit to loop received data to itstransmitter (see Figure 4-2). DSR and RD in the remote unitgo low. This loopback may also be activated from the DTEwhen pin 21 is set to “EN”.

ITA-703 Installation & Operation Manual Chapter 3 - Operation

12-08-98 13:55 Reconfiguring ITA-703 3-3

3.3 Operating Instructions

ITA-703 requires no operator intervention once installed (see Chapter 2),except for occasional monitoring of the front panel indicators. Intervention isonly required when:

• ITA-703 has to be adapted to new operational requirements.

• Diagnostic loops are required.

Power-OnProcedure

ITA-703 is turned on as soon as its power cord is connected to the powermains outlet. The PWR LED lights up, indicating that ITA-703 is on.

Verify that the local and remote ITA-703 units are in operation by checkingthat the front panel LEDs on the local and remote units match the followingconditions:

PWR On

RTS On

TD Flashing or Off

RD Flashing or Off

TST Off

SYNC LOSSV100 OffG703 Off

Hint:If the indicators do not match the conditions above, verify that none of thefront panel test buttons are depressed.

Activation of Tests In order to verify that ITA-703 is operating correctly, use the loopback testsas described in Chapter 4. When performing tests, observe the followingguidelines and restrictions:

• Activation of a test loop interrupts normal traffic flow.

• Only one test can be activated at a time.

Power-OffProcedure

To turn off the power to ITA-703, simply remove the power cord from thepower source.

Chapter 3 - Operation ITA-703 Installation & Operation Manual

3-4 Reconfiguring ITA-703 12-08-98 13:55

3.4 Reconfiguring ITA-703

If it becomes necessary to reconfigure ITA-703 for a different type ofoperation, field straps must be changed to correspond to the new operatingmode.

For guidance in repositioning the straps and switches, refer to Section 2.5,“Electrical Installation”, in Chapter 2 and to Table 2-1. Field straps should bechanged by an experienced technician.

Warning

To avoid accidental electric shock, disconnect the ITA-703 power cordand the line wires before removing the unit from its casing.

23-07-98 16:46 V.54 Loop Tests 4-1

Chapter 4Tests and Diagnostics

4.1 General

This chapter contains procedures for performing system diagnostic tests forITA-703. Use the test procedures provided in this chapter to:

• Verify normal system operation

• Isolate faulty equipment or cables

• Identify other sources of system malfunction.

Tests are activated by control push buttons on the ITA-703 front panel andmonitored via LED indicators. For description of ITA-703 controls andindicators and their functionality, see Chapter 3.

Section 4.2 describes ITU V.54 diagnostic capabilities for performing localanalog loopbacks and local and remote digital loopbacks featured byITA-703.

Section 4.3 describes a self-test for checking if the unit itself operatesproperly.

4.2 V.54 Loop Tests

ITA-703 supports several types of loopback tests for evaluating the operationof the data system equipment and its line circuits. Using these loopbacks,you can test communication between the attached equipment, internalcircuitry of the local ITA-703 and the remote ITA-703.

Loopback tests are best performed in the following order (as presented inthis section):

• Local analog loopback

• Remote digital loopback

• Local digital loopback.

Chapter 4 - Tests and Diagnostics ITA-703 Installation & Operation Manual

4-2 V.54 Loop Tests 23-07-98 16:46

Note Before running the loopback tests:

• Verify that the DTE is operating properly and can be used for a test. Do notperform tests with faulty equipment.

• Ensure that all units are powered on and are configured correctly.

Local AnalogLoopback (LLB)

The Local Analog Loopback (LLB) test checks the performance of the localITA-703, the local DTE, and the connections between them. It is performedseparately at the local and the remote site. To perform the test, proceed asfollows.

Activate the LLB loopback by pressing the ANA button on the ITA-703 frontpanel. When LLB is initiated, the TST LED will light, indicating that the ITA-703 transmit output is now operationally connected to its own receiver (seeFigure 4-1). ITA-703 continues to send data to the line side. This test canalso be activated via pin 18 on the DTE interface.

DTE

ANAPRESSED

ITA-703

LINEINTERFACE

DATA

DATA

TRANSMIT

RECEIVE

CLK

CLK

Figure 4-1 Local ITA-703 in Analog Loopback (LLB)

It is recommended to repeat the LLB test using external BERT equipment. Ifthe BERT test indicates an error-free data stream, but the test using DTEindicates a fault, verify that the cable between the DTE and ITA-703 isproperly connected. If the problem persists, follow the DTE manufacturer’stest procedures.

To pinpoint a communication line problem, perform the LLB loopback atthe opposite end. If both LLB tests are error-free, the fault is in thecommunication line or in the line interfaces.

After completing the test or correcting the fault, restore the ANA button tothe OFF position.

ITA-703 Installation & Operation Manual Chapter 4 - Tests and Diagnostics

23-07-98 16:46 V.54 Loop Tests 4-3

Remote DigitalLoopback (RLB)

The Remote Digital Loopback (RLB) test determines the performance of thelocal and the remote ITA-703 units as well as their connecting lines. TheRemote Digital Loopback sets a loop at the remote ITA-703 unit from theterminal coupled to the local unit (see Figure 4-2).

REMPRESSED

LOCALDTE

REMOTE ITA-703LOCAL ITA-703

REMOTEDTE

DATACLK

CLKDATA Receive

Transmit Receive

Transmit

LineInterface

LineInterface

Figure 4-2 Local ITA-703 in Remote Digital Loopback (RLB)

To perform the test, activate the RLB loopback by pressing the REM buttonon the ITA-703 front panel. Running this test will light the TST LED on thefront panel of both the local and remote units. The SYNC LOSS LEDs shouldnot light neither on local nor on the remote unit. This test can also beactivated via pin 21 on the DTE interface.

If the RLB test indicates a fault, but the LLB test (see above) was successfulfor both local and remote units, then the line, or line circuits on either sideof the line, are not functioning properly.

Local DigitalLoopback (DIG)

This test is activated by pressing the DIG button. The test consists of loopingthe received data back to the remote ITA-703, as shown in Figure 4-3. Usingthis test, the operator at the remote end can determine the performance ofthe local and remote ITA-703 units, and the communication linesinterconnecting them.

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4-4 ITA-703 Self-Test 23-07-98 16:46

Receive

Transmit

DIGPRESSED

LOCALDTE

Receive

Transmit

REMOTE ITA-703LOCAL ITA-703

REMOTEDTE

DATACLK

CLKDATA

LineInterface

LineInterface

Figure 4-3 Local ITA-703 in a Digital Loopback

4.3 ITA-703 Self-Test

This test (see Figure 4-4) verifies that the converter itself is operatingcorrectly. To perform the test, proceed as follows:

1. Press the ANA button on the ITA-703 front panel and wait for the TSTLED to light.

2. Verify that both of the SYNC LOSS LEDs are OFF. If one of them lightsup or blinks, then the ITA-703 communication system is faulty.

If the test executes correctly, restore the ANA button to its normal position.

ITA-703

SYNC LOSS

RECEIVER

TRANSMITTER

ANAPRESSED

V.110

G.703

Transmit

Receive

Figure 4-4 ITA-703 Self-Test

04-06-00 14:45 ASM-MN-214 Card Cage 5-1

Chapter 5Card Cage Version

5.1 ASM-MN-214 Card Cage

The ASM-MN-214 card cage contains one or two power supplies and up to14 plug-in cards. The card types can be ITA-703/R or other RAD rackversion modems/converters – any combination of up to 14 plug-in cards.

For each of the 14 cards, the rear panel (see Figure 5-1) contains a maleconnector for the terminal block and a DB-25 connector. A protection coverprotects the terminal block connectors.

The terminal block (see Figure 5-1) is to be attached to the rear panelterminal block connectors. It contains screws for connecting the transmitand receive pairs and ground, if present.

The 25-pin D-type female interface connector provides all interface signalsfor the digital interfaces. Converters with X.21 or V.35 interface require anexternal mechanical adapter. Two optional interface attachments,CIA/V.35/1 and CIA/X.21, can be ordered separately from RAD. CIA/X.21converts two adjacent DB-25 connectors to two X.21 15-pin connectors.CIA/V.35/1 converts one DB-25 connector to a V.35 34-pin connector. Toconvert the DB-25 connector to a V.36 37-pin connector, an optional RADadapter cable (CBL 530/449/F) can be ordered separately. The adaptercable and two interface attachments are also shown in Figure 5-1.

Chapter 5 - Card Cage Version ITA-703 Installation & Operation Manual

5-2 ITA-703/R Card Version 04-06-00 14:45

TerminalBlock

TerminalBlock

ProtectionCover

CIA/V.35/1

CIA/X.21

CBL 530/449/F

Figure 5-1 ASM-MN-214 Rear Panel

5.2 ITA-703/R Card Version

ITA-703/R is a card version of the ITA-703, having the same functionality asthe standalone device. LED indicators and test switches of each ITA-703card are conveniently located on the front panel shown in Figure 5-2,enabling LED indicators to be clearly visible, and test switches to be easilyhandled. See Chapter 2 for card jumper setting and Chapter 3 for cardoperation information.

ITA-703 Installation & Operation Manual Chapter 5 - Card Cage Version

04-06-00 14:45 Power Supply 5-3

TD

RD

TST

G703

V110

SYNC LOSS

DIG

ANA

REM

ITA-703

PWR

RTS

Figure 5-2 ITA-703/R Front Panel

5.3 Power Supply

The ITA-703 card is powered from the ASM-MN-214 power supply via itschassis. Each ITA-703 card has two fuses which protect the entire systemagainst power failure due to a short circuit in one card.

The ASM-MN-214 card cage can accept both AC or DC power supplies.LED indicators located on the ASM-MN-214 front panel (see Figure 5-3)show activity when the power supply is connected to the mains plug. Thepower supply supports the full card cage with any combination of cards.


5-4 Power Supply 04-06-00 14:45

AC Supply The AC power supply of the ASM-MN-214 is 100, 115 or 230 VAC, ±10%,50 or 60 Hz.

DC Supply The DC power supply is 48 VDC (36 to 72 VDC) or 24 VDC (18 to32 VDC). It uses a DC/DC converter module to provide the powerrequired for the cards.

Power Supplywith Redundancy

This special ordering option is equipped with two separate power supplies,operating together and sharing the load of the whole card cage. If either ofthe power supplies fails, the other one will continue to supply power to thefull card cage.

Two LED indicators show activity of each power supply. They should bothlight when mains power is provided.

Note It is possible to combine AC and DC power supplies in the same cage.

Figure 5-3 ASM-MN-214 Front Panel

ITA-703 Installation & Operation Manual Chapter 5 - Card Cage Version

04-06-00 14:45 Installation 5-5

5.4 Installation

To install the ITA-703/R card in the ASM-MN-214 card cage:

1. Install the ASM-MN-214 card cage in the 19" rack.

2. Adjust the jumpers on the card as required (see Table 2-1 and Figure 2-1 in Chapter 2).

3. Insert the ITA-703/R card into one of the ASM-MN-214 slots. Push thebottom of the card into the cage to until it is fully inserted into the edgeconnector inside the rack. Tighten the screws on the top and on thebottom of each card.

4. Remove the protection cover from the terminal block connectors.

5. Connect the terminal block to the ASM-MN-214 terminal blockconnector.

6. Connect the line to the terminal block as follows: connect transmit pairto the terminals marked XMT, the receive pair to the terminals markedRCV, and the fifth screw to ground (optional).

7. If required, attach the appropriate CIA (CIA/X.21 or CIA/V.35/1) or V.36adapter cable to the DB-25 connector on the card cage rear panel.

8. Connect the DTE cable to the DB-25 connector, other side of CIA oradapter cable (depending on your card interface).

9. Connect power to the ASM-MN-214 card cage:− To connect AC power, connect the power cable to the mains supply.

− To connect DC power, refer to DC Power Supply ConnectionSupplement of the ASM-MN-214 Installation and Operation Manual.

Note The ASM-MN-214 card cage has no power switch. Operation starts when thepower is applied to the rear panel POWER connector. When applying power,first connect the plug of the power cord to the ASM-MN-214 POWERconnector and then to the mains power source (outlet).


5-6 Installation 04-06-00 14:45

27-07-98 08:33 A-1

Appendix AV.24/RS-232Interconnection

Table A-1 DTE Interface Signal Assignments

Signal Name V.24 RS-232 Pin Description

Protective Ground 101 AA 1 Chassis ground. May be isolated from Signal Ground(refer to GND Strap in Table 2.1).

Signal Ground 102 AB 7 Common signal and DC power supply ground.

− N/A N/A 910

Output +5 VDCOutput -5 VDC

Transmitted Data 103 BA 2 Serial digital data from a terminal or other source. Ifaccompanied by an external data rate clock, datatransitions must occur on positive-going transitions ofthe external transmit output clock.

Received Data 104 BB 3 Serial Digital data at the output of the unit receiver.The data transitions occur on the rising edge of theclock.

Request to Send 105 CA 4 A positive level to ITA-703 when data transmission isdesired.

Clear to Send 106 CB 5 A positive level from ITA-703, after receipt of Requestto Send and when ITA-703 is ready to transmit

Data Set Ready 107 CC 6 A positive level from ITA-703 when the power is onand ITA-703 is not in the DIGITAL LOOP mode or hasnot received a REMOTE LOOPBACK signal from theremote unit; otherwise, Data Set Ready follows theremote DTR

Receive LineSignal Detector(Carrier Detect)

109 CF 8 A positive level from ITA-703, except when a loss ofthe received input signal is detected or when remoteRTS is negative.

External Trans.Serial Clock

113 DA 24 A serial data rate clock input from the data source.Positive clock transitions correspond to datatransitions.

Appendix A - V.24/R.232 Interconnection ITA-703 Installation & Operation Manual

A-2 27-07-98 08:33

Table A-1 DTE Interface Signal Assignments (Cont.)

Signal Name V.24 RS-232 Pin Description

Transmitter SignalElement Timing

114 DB 15 A transmit data rate clock for use by external datasource. Positive clock transitions correspond to datatransitions.

Receiver Signal 115 DD 17 A receive data rate clock output for use by externaldata sync. Positive clock transitions correspond to datatransitions.

Test Indicator 142 − 25 A control signal output from ITA-703. Positive duringany test mode.

Loop 3Test Command

141 − 18 A control signal input; when on, commands ITA-703into Local Analog Loopback (V.54 Loop 3).

Loop 2Test Command

140 − 21 A control signal input; when on, commands ITA-703to send a remote Loopback Command (V.54 Loop 2)to the remote ITA-703.

Data TerminalReady

108 − 20 This input signal is passed through to the remoteITA-703 as DSR.

04-06-00 14:43 Installation of the Unit Case into a 19" Rack B-1

Appendix BUnit Case Assembly

B.1 Installation of the Unit Case into a 19" Rack

General The height of the unit is 1U (1.75"); the width of the unit is slightly less thanhalf the available mounting width. A rack adapter kit, RM-9, is available forinstalling either a single unit or two units side by side in a 19" rack.

Warning

Disconnect AC power before performing the procedures below.

Installation of aSingle Unit

Rack adapter components for installing a single unit include one shortbracket and one long bracket. Each bracket is fastened to the side walls ofthe unit by two screws which are inserted into the two front holes on theside wall. Note that the short bracket fastens to the left side of the unit, andthe long bracket to the right side of the unit (see Figure B-1).

Once the brackets are fastened to the side walls, the unit is ready forinstallation in the 19" rack. Place the unit in the rack and fasten the bracketsto the side rails of the rack using two screws on each side (not included inthe kit).

Appendix B - Unit Case Assembly ITA-703 Installation & Operation Manual

B-2 Installation of the Unit Case into a 19" Rack 04-06-00 14:43

Figure B-1 Installation of a Single Unit

Installation ofTwo Units

Rack adapter components for installing two units include two long side rails(one for each unit) which slide one into the other fastening the two unitstogether, and two short side brackets which hold the two units in the19" rack (see Figure B-2).

To install two units follow these instructions:

1. Fasten one long side rail to each unit using the four screws supplied. Theside rails must be attached in opposing fashion, the narrow flange of thefirst rail opposite the wide flange of the second rail.

2. Attach one short bracket opposite the side rail on each unit using thefour screws supplied.

3. Slide the side rail of one unit into the side rail of the other unit, fasteningthe two units together (see Figure B-3).

4. Secure the supplied plastic caps to the ends of the rails to prevent theunits from moving and to protect the rail ends.

5. Place the assembled units in the rack and fasten the brackets to the siderails of the rack using four screws on each side (not included in the kit).

ITA-703 Installation & Operation Manual Appendix B - Unit Case Assembly

04-06-00 14:43 Installation of the Unit Case into a 19" Rack B-3

Figure B-2 Installation of Two Units (a)

Figure B-3 Installation of Two Units (b)

Appendix B - Unit Case Assembly ITA-703 Installation & Operation Manual

B-4 Installation of the Unit Case into a 19" Rack 04-06-00 14:43

Documents

ITA703FMmaterias.fi.uba.ar/6679/apuntes/4300_ita703.pdfA special hardware kit, RM-9, for mounting standalone units into a 19" rack can be ordered separately. This hardware enables