Patton electronics 2072, CTS IC-G.703 Installation And Operation Manual

INTERFACE CONVERTER, G.703

2072

(CTS IC-G.703)

INSTALLATION AND OPERATIONS MANUAL

Dos #: 180001UA

Part #: 07M2072-A

B

January10, 2000

Copyright© 2000 Patton Electronics Co., All Rights Reserved

An ISO-9001

Certified Company

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Table of Contents

CHAPTER 1 - Operation

CHAPTER 2 - SETUP AND INSTALLATION

Installation ..............................................................................................2-1

Selection of DTE/DCE ...........................................................................2-1

Equipment Grounding ............................................................................ 2-1

LED Indicators .......................................................................................2-1

Front Panel Loop Back Button ...............................................................2-1

Data Rate (SW5-3,4) .............................................................................2-2

Control Lead Pass Through / Async Channel (SW5-2) .........................2-2

Clear to Send (CTS) Control (SW4-6) ...................................................2-2

Auto Digital Loop Enable (SW5-5) .........................................................2-2

Loss of Signal or Control Lead to Carrier Detect (SW5-1).....................2-3

MARK Polarity (JP5, JP6)......................................................................2-3

Secondary Async Port CTS Forced of Follows RTS (JP4)....................2-3

Clocking Modes (SW4-1,2,3,4,5) ...........................................................2-3

Line Terminal Block ...............................................................................2-4

Factory Test Straps................................................................................ 2-4

APPENDIX

TECHNICAL SPECIFICATIONS ........................................................... A-1

Typical Application ................................................................................ A-1

Strapping Diagram ................................................................................ A-2

X.21 Interface Pins Supported .............................................................. A-3

V.24 Asynchronous Interface Pins Supported ...................................... A-3

V.35 Interface Pins Supported .............................................................. A-3

Rear Panel ............................................................................................ A-3

i

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ii

Copyright© 2000 Patton Electronics Co., All Rights Reserved

PROPRIETARY NOTICE

The information contained herein is proprietary and confidential to Patton Electronics Co.
Any reproduction or redistribution of this publication, in whole or in part, is expressly
prohibited unless written authorization is given by Patton

Electronics Co.

SERVICE

All warranty and non-warranty repairs must be returned freight prepaid and insured to
Patton Electronics. All returns must have a Return Materials Authorization number on the
outside of the shipping container. This number may be obtained from Patton Electronics
Technical Services at:

Tel: [phone];
email: [e-mail];
or, Web: http://www.patton.com.

NOTE: Packages received without an RMA number will not be accepted.
Patton Electronics’ technical staff is also available to answer any questions that might

arise concerning the installation or use of your Patton MSDs. Technical Service hours:
8AM to 5PM EST, Monday through Friday.

PUBLICATION NOTICE

This manual has been compiled and checked for accuracy. The information in this manual
does not constitute a warranty of performance. Patton reserves the right to revise this
publication and make changes from time to time in the content thereof. Patton assumes
no liability for losses incurred as a result of out-of-date or incorrect information contained
in this manual.

RADIO AND TV INTERFERENCE

The Patton devices generate and use radio frequency energy, and if not installed and
used properly—that is, in strict accordance with the manufacturer’s instructions—may
cause interference to radio and television reception. The Patton devices have been
tested and found to comply with the limits for Class A computing devices in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are designed to
provide reasonable protection from such interference in a commercial installation.
However, there is no guarantee that interference will not occur in a particular installation.
If the Patton devices do cause interference to radio or television reception, which can be
determined by disconnecting the cables, the user is encouraged to try to correct the
interference by one or more of the following measures: moving the computing equipment
away from the receiver, re-orienting the receiving antenna, and/or plugging the receiving
equipment into a different AC outlet (such that the computing equipment and receiver are
on different branches).

Canadian EMISSIONS

This digital apparatus does not exceed the Class A limits for noise emissions from a
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.

Le present appareil numerique n’emet pas de bruits redioelectriques depassant les limites
applicables aux appareils numeriques de la Class A prescites dans le Reglement sur le
brouillage redioelectrique edicte par le ministere des Communications du Canada.

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CHAPTER 1 - Operation

The Patton 2072 (CTS IC-G.703) is a CCITT G.703 Co-Directional rate and
interface converter. Both CCITT V.35 and CCITT X.21 interfaces are
provided for. An M-34 connector for V.35 and a DB-15 connector for X.21
are located on the rear panel. The interface converter operates bi­directionally. DCE / DTE selection of the ports permits interfacing termi­nals or modems to the G.703 interface converter. This adapter is switch
selectable for 48Kbps, 56Kbps or 64Kbps data rates. When configured for
48Kbps or 56Kbps, it will provide an additional asynchronous service
channel.

The 2072 (CTS IC-G.703) can be clocked from the recovered clock of the
receive pair. Can be provided to the 2072 (CTS IC-G.703) by an attached
device externally or be generated by the 2072 (CTS IC-G.703) internally.
Elastic buffers are provided to compensate for the phase difference be­tween clocks.

The 2072 (CTS IC-G.703) fully conforms to the G.703 CCITT standard by
performing the required “1’s density” bit stuffing every 7 bits. Additionally it
will pass a control signal from end to end or the 1200 bps asynchronous
service channel for enhanced line utilization.

A built in Burst Error Rate Tester (BERT) and both Analog and Digital Loop
Back allow the user flexibility in circuit verification and testing. When either
Loop Back button indicates

BLACKBLACK

BLACKBLACK

BLACK (OUT), that loop back is disabled and

all signals pass normally through the 2072 (CTS IC-G.703). When either
Loop Back button indicates

GREENGREEN

GREENGREEN

GREEN (IN), that loop back is enabled. The

2072 (CTS IC-G.703) implements digital and analog loop back of the data

1-1

RX TX

J3 J2 J1

RATING:

110/220
50/60Hz

250mA/160mA

PW TD RD L OS

INTERNATIONAL
SERIES

2072

DL AL TST RLB ERR SYN

ANA LO G

LOOP

DIGITAL

LOOP

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1-2

and clocks. Analog Loop turns the data around at the analog interface to
the G.703 interface. When Analog Loop is selected the

ALAL

ALAL

AL LED will

illuminate. Digital Loop turns the data around at the V.35 digital interface.
When Digital Loop is selected the

DLDL

DLDL

DL LED will illuminate.

Modem

Logic

DTE

F low of Data

TX

RX

Digital Loop Analo

g

Loop

Modem

Logic

DTE

Flow of Data

TX

RX

If both Loopback buttons indicate

GREENGREEN

GREENGREEN

GREEN (IN) then the unit is in Test mode

and the

TSTTST

TSTTST

TST LED will be illuminated. In this configuration, a BERT pattern

is sent to the remote 2072 (CTS IC-G.703) unit. If the remote unit detects
the BERT pattern and the remote BERT detect option is enabled, the
remote unit will turn on its Remote Digital Loopback, illuminate the

RDLRDL

RDLRDL

RDL

LED and loop the test pattern back to the sending unit to complete the
test loop. If errors are detected at the originating 2072 (CTS IC-G.703) the

ERRERR

ERRERR

ERR LED is illuminated.

The interface converter is housed in a sturdy aluminum enclosure and
has an internal 110/220VAC switch selectable power supply.

The unit has UL, and CSA approvals and can operate on standard power
found in most countries.

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2-1

CHAPTER 2 - SETUP AND INSTALLATION

Installation

Set the switches to match the required configurations based on the
diagrams below. The cabling between each device and the interface
converter must be terminated with male connectors. J1 is the V.35
interface, J2 is the X.21 interface and J3 is the V.24 low speed asynchro­nous interface. The 4 position terminal block is for the G.703 line connec­tion. The IEC connector is provided to interface to the power plug re­quired in the country of use. Insure the 110/220VAC switch is set cor­rectly for the line voltage in use prior to applying power to the interface
converter.

Selection of DTE/DCE

To connect a terminal type device (DTE) to the 2072 (CTS IC-G.703),
connect the Terminal to J1 or J2 and move SW1, SW2, and SW3 to the
rear of the unit toward the connectors (DCE position).

To connect a Modem type device (DCE) to the 2072 (CTS IC-G.703),
connect the Modem to J1 or J2 and move SW1, SW2, and SW3 to the
front of the unit away from the connectors (DTE position).

Equipment Grounding

JP7 provides grounding interconnection in those systems requiring a
connection between Frame Ground and Signal Ground. If signal ground
and chassis ground interconnection is desired, install the jumper on JP7.

LED Indicators

The Following LED indicators are provided for diagnostics: Power (PW),
Transmit Data (TD), Receive Data (RD), Loss of Signal (LOS), Digital
Loopback (DL), Analog Loopback (AL), Test (TST), Remote Loopback
(RLB), Error (ERR) and Sync (SYN).

Front Panel Loop Back Buttons

The Digital Loop and Analog Loop buttons are provided to enable and
disable the testing and loopback features.

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2-2

Data Rate (SW5-3,4)

Selection of data rates is provided by switch 5, positions 3 and 4. The
following chart summarizes the available:

SW5-3 SW5-4 Rate

ON ON 48Kbps

OFF ON 56Kbps

ON OFF 64Kbps

OFF OFF N/A

Control Lead Pass Through / Async Channel (SW5-2)

Selection of the asynchronous service channel or a control lead pass
through for 48K and 56Kbps rate selection is provided by SW5 pos 2. If
an asynchronous 1200 bps service channel is desired, set SW5-2 to ON.
If it is desired to pass the RTS when DCE is selected or the DCD when
DTE is selected to the remote end, set SW5-2 to OFF. The passed
control lead will be presented at the far end as an RTS if the IC-G.703 is
configured as a DTE or DCD if configured as DCE. This option must
match at both ends of the circuit.

Clear to Send (CTS) Control (SW4-6)

Selection of the source for CTS is via Switch 4 pos 6. To force the CTS to
active regardless of RTS activity, set SW4-6 to

ONON

ONON

ON. If it is desired to allow

CTS to follow RTS then set SW4-6 to

OFFOFF

OFFOFF

OFF. This circuit is only operational

when the 2072 (CTS IC-G.703) is configured as a DCE.

Auto Remote Digital Loop Enable (SW5-5)

To enable automatic Remote Digital Loopback when upon detection of the
BERT test pattern set Switch 5 pos 5 to

ONON

ONON

ON.To configure the IC-G.703 unit

to ignore the test pattern when received set Switch 5 pos 5 to

OFFOFF

OFFOFF

OFF.

Loss of Signal or Control Lead to Carrier Detect (SW5-1)

Selection of the source for Carrier Detect (CD) is via Switch 5 pos 1. If you
want the remote units selected control lead to appear on the CD interface
signal leads of the local units, set SW5-1 to

ONON

ONON

ON. If it is desired to have the

Loss Of Signal (LOS) on the CD interface signal leads, then set SW5-1 to

OFFOFF

OFFOFF

OFF.

MARK Polarity (JP5, JP6)

JP5 and JP6 select the polarity of the G.703 signal when the X.21 or V.35
signal is in a MARK condition. If you require MARK to be a

ZEROZERO

ZEROZERO

ZERO on the

G.703 interface, place the header for both JP5 & JP6 on pins 1 & 2.

2-3

Looking from the front of the unit this is on the right two pins of both
jumpers. If you require MARK to be a

ONEONE

ONEONE

ONE on the G.703 interface, place

the header for both JP5 & JP6 on pins 2 & 3. Looking from the front of the
unit this is on the left two pins of both jumpers.

Secondary Async Port CTS Forced or Follows RTS (JP4)

JP4 determines the source of the CTS signal on J3, the asynchronous
service port. To force the CTS to constant active, install the header on
JP4 pins 2 & 3. For CTS to follow RTS install the header on JP4 pins
1 & 2.

Clocking Modes (SW4-1,2,3,4,5)

Clocking mode selection is provided by Switch 4, positions 1 through 5.

Only one switch position should be set to OFF at any timeOnly one switch position should be set to OFF at any time

Only one switch position should be set to OFF at any timeOnly one switch position should be set to OFF at any time

Only one switch position should be set to OFF at any time.

Selecting more than one mode may result in erratic operation of the 2072
(CTS IC-G.703).

The G.703 Co-directional interface specification requires that the Data and
Clock will be provided by the same source. The 2072 (CTS IC-G.703) will
provide a clock for the data it sends to the central office PCM link. The
Central Office provides the clock for the data coming from the Central
Office on the PCM link to the 2072 (CTS IC-G.703). This arrangement is
fixed in the hardware and cannot be modified.

Clocking on the V.35 and X.21 interface however is very flexible and can be
configured to meet any need the user has. The follow descriptions along
with the diagrams explain all of the possible clocking modes available to
chose from.

Mode 1 (SW4-1

OFF, OFF,

OFF, OFF,

OFF, 2, 3, 4, 5

ONON

ONON

ON)

The 2072 (CTS IC-G.703) provides both receive and transmit clock to a
DTE device connected on the V.35 or X.21 interface. The receive clock
provided on the PCM channel is used to generate all outgoing clocking.
Data passes through both the TX BUFFER and the RX BUFFER using the
PCM RX TIMING for both input and output clocks.

TX TIMING

DTE

TX BUFFER

RX BUFFER

RX TIMING

RX DATA

RX DATA

TX DATA

PCM

RX TIMING

TX TIMING

TX DATA

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2-4

Mode 2 (SW4- 2

OFF OFF

OFF OFF

OFF 1, 3, 4, 5

ONON

ONON

ON)

The 2072 (CTS IC-G.703) gets its receive clock from a DCE device and
gives an external transmit clock to the DCE device connected on the V.35
interface. The receive clock provided on the PCM channel is used to
generate all outgoing clocking. Data passes through the RX BUFFER
using the RX TIMING for both input and output clocks. Data passes
through the TX BUFFER using the DCE TX TIMING for the input clock and
PCM RX TIMING for the output clock. This mode is not available for X.21.

TX TIMING

Ext TX TIMING

DCE

TX BUFFER

RX BUFFER

TX DATA

RX TIMING

RX DATA

RX DATA

TX DATA

PCM

RX TIMING

Mode 3 (SW4-3

OFF OFF

OFF OFF

OFF 1, 2, 4, 5

ONON

ONON

ON)

X.21 ONLYX.21 ONLY

X.21 ONLYX.21 ONLY

X.21 ONLY

The 2072 (CTS IC-G.703) gets the Signal Timing from the X.21 DCE device
connected on the DB-15 interface. The receive clock provided by the PCM
channel is used to generate transmit clock for data going to the PCM
interface. Data passes through the RX BUFFER using the PCM RX TIMING
for the input clock and Signal Timing from the X.21 interface for the output
clock. Data passes through the TX BUFFER using the Signal Timing from
the X.21 interface for the input clock and PCM TX TIMING for the output
clock.

TX TIMING

DCE

TX BUFFER

RX BUFFER

TX DATA

RX DATA

RX DATA

TX DATA

PCM

RX TIMING

SIGNAL TIMING

Mode 4 (SW4-4

OFF OFF

OFF OFF

OFF 1, 2, 3, 5

ONON

ONON

ON)

The 2072 (CTS IC-G.703) gets an external transmit clock from the DTE
device and gives a receive clock to the DTE device connected on the V.35
interface. The receive clock provided on the PCM channel is used to

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2-5

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generate the receive clock provided to the V.35 interface. The external
transmit clock provided on the V.35 interface is used to generate the
transmit clock provided to the PCM channel. This mode is not available for
X.21.

Ext TX TIMING

DTE

TX BUFFER

RX BUFFER

TX DATA

RX TIMING

RX DATA

RX DATA

TX DATA

PCM

TX TIMING

RX TIMING

Mode 5 (SW4-5

OFF OFF

OFF OFF

OFF 1, 2, 3, 4

ONON

ONON

ON)

The 2072 (CTS IC-G.703) gives both the receive and transmit clock to the
DTE connected on the V.35 interface. The receive clock provided on the
PCM channel is used to generate the receive clock provided to the V.35
interface. An internal time base is used to generate all transmit clocks.
This mode is not available for X.21.

TX TIMING

DTE

TX BUFFER

RX BUFFER

TX DATA

RX TIMING

RX DATA

RX DATA

TX DATA

PCM

RX TIMING

OSC.

TX TIMING

TX TIMING

Line Terminal Block

The terminal block on the rear panel of the 2072 (CTS IC-G.703) is used to
connect to the G.703 PCM system. The input from the G.703 system
connect to the terminals labeled RX. The output from the 2072 (CTS IC­G.703) to the G.703 system come from the terminals labeled TX. Both
input and output are transformer coupled and are not polarity sensitive.

Factory Test Straps

The Factory Test Straps JP1, JP2 and JP3 must be installed for proper
operation of the interface converter.

2-6

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APPENDIX
TECHNICAL SPECIFICATIONS

Applications

V.35 or X.21 to G.703 Co-Directional
interface and rate conversion

Capacity

One Channel V.35 or X.21 to G.703

Data Format

Data Coding: Synchronous

Data Rates

48Kbps, 56Kbps and 64Kbps

Electrical Interface

V.35 or X.21 and G.703

V.35 Physical Interface

V.35 on a Female M-34 Connector

X.21 Physical Interface

X.21 on a Female DB-15 Connector

G.703 Physical Interface

G.703 Co-Directional Interface on
a 4 position Terminal Block

Enclosure

Metal: Aluminum

Approvals

CE Pending

Front Panel

Indicators:.... Power, TD, RD,

LOS, DL, AL, TST,
RLB, ERR, SYN

Switches: ..... Loop Back

Power Requirements

100-120/200-240VAC, 50 to 60Hz,

0.25/0.16A, Switch Selectable

Environmental

Oper Temp:..... 32° to 122°F (0° to

50°C)

Rel Humidity: ... Up to 90% non-

condensing

Altitude:........... 0 to 10,000 feet

Dimensions

Height: .... 1.75 inches (4.44 cm)

Width: ..... 8.90 inches (22.60 cm)

Length: ... 10.00 inches (25.40 cm)

Weight

2.25 lbs (1.02 Kg)

Warranty

Two Years, Return to Factory

Typical Application

2072

V.35 or X.21

48, 56 or 64Kb

p

s

Data

Central Office

PCM E

quip

ment

G.703

CoDirectional

64K b

p

s Da ta

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A-1

JP3 JP2

JP1

JP7

Power
TD
RD

SW1

LOS

DCEDTE

Factor y T e s t St raps Must be Instal l ed

for Unit To O pe rat e Corre ctl y

SW2

SW3

JP 4

JP 5

JP 6

123

Connect Signal to

Chassis Ground

J1

V.35

J2

X.21

J3

V.24

ONOFF

123456

ONOFF

123456

RTS/CTS

Forced CT S

MARK = 1
MARK = 0

SW4

SW5

Data Rate

Data Rate SW 5

3

ON

OFF

ON

4

ON
ON

OFF

Rate

48K
56K
64K

Async Service Chan Available = ON / Cntl Lead Available = OFF

Clocking Mode 1 = OFF
Clocking Mode 2 = OFF
Clocking Mode 3 = OFF
Clocking Mode 4 = OFF
Clocking Mode 5 = OFF

Enable Re mote Loo p = ON / D is able R L = OF F
Not Use d

Force CTS=ON / Follow RTS=OFF

Async S er vice

Channel

CD from Cnt Lead = ON / CD from LOS = OFF

Only

ONE

Can be

OF F

at any time!

Analog Loop (IN)

123

MARK = 1
MARK = 0

1

2

3

DL

AL
TS T
RLB
ERR

Digital Loop (IN)

PN-1 80010B

SYN

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A-2

Shield (common)
Transmit(A) (from DTE)
Control(A) (from DTE)
Receive(A) (from DCE)
Indication(A) (from DCE)
Si

g

nal Timing(A) (from DCE)

GND (common)

Transmit(B) (from DTE)

Control(B) (from DTE)

Receive(B) (from DCE)

Indication(B) (from DCE)

Si

g

nal Timing(B) (from DCE)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

X.21 Interface Pins Supported

1
2
3
4
5

6
7
8
9

Transmit Data (from DTE)
Receive Data (from DCE)

Request to Send (from DTE)

Clear To Send (from DCE)

Data Set Ready (from DCE)

Si

g

nal Ground (common)

Data Carrier Detect (from DCE)

V.24 Asynchronous Interface Pins Supported

Z DD JJ

BB FF LL

CC HH MM

EE KKM

K

B

SG

F

CD

L R

RD(A)VRT(A)

D

CTS

J N T

RD(B)

A

FGEDSR

P

TD(A)

C

RTSHDTR

S

TD(B)WETT(B)AATT(B)

U

ETT(A)YTT(A)

RT(B)

X

NN

V.35 Interface Pins Supported

RX TX

J3 J2 J1

RATING:

110/220
50/60Hz

250mA/160mA

Rear Panel

B

Sales: 301 975-1000 Support: 301 975-1007

Web Address: http://www.patton.com

7622 Rickenbacker Drive
Gaithersburg, MD 20879