Black Box MTU200-N64M User Manual

Standalone G-Converter:

MTU200-N64M

9th June 2000

Rev 1.0

Standalone G-Converter

G.703/G.704 to Nx64 X.21/V.35 Converter

TECHNICAL:

SALES:

FAX:

ADDRESS:

WEB:

[phone]
[phone]
[phone]
464 Basingstoke Road, Reading, Berkshire RG2 0QN
www.blackbox.co.uk

Standalone G-Converter

How To Contact your Local Black Box

Italy: Australia:

Black Box Italia S.P.A Black Box Catalog Australia PTY LTD
Tel: [phone] Tel: [phone]

Fax: [phone] Fax: [phone]
Web Site: www.blackbox.it

Deutschland: Brazil:

Black Box Deutschland Black Box Do Brasil.
Tel: [phone] Tel: [phone]

Fax: [phone] Fax: [phone]
Web Site: www.blackbox-deutschland.com Web Site: www.blackbox.com.br

Switzerland: Canada:
Datacom Black Box Services AG Black Box Canada Corp.

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Web Site: www.black-box.ch Web Site: www.blackbox.com

Netherlands: Mexico:

Black Box Datacom BV Black Box De Mexico S.A. de C.V

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Web Site: www.blackbox.nl/ Web Site: www.blackbox.com.mx

Belgium: Japan:

Black Box Black Box Catalog

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Web Site: www.blackbox.be Web Site: www.blackbox.co.jp/

2

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Standalone G-Converter

France: U.S.A

Black Box Catalogue Black Box Corporation

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Web Site: www.blackbox.fr Web Site: www.blackbox.com

Spain: Chile

Black Box Comunicaciones S.A. Black Box Chile

Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Web Site: www.blackbox.es Web Site: www.Blackbox.cl

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3

Standalone G-Converter

Standalone G-Converter

G.703/G.704 to Nx64 X.21/V.35 Converter

User Manual

WARNING - BEFORE INSTALLATION, PLEASE REFER

TO SAFETY INSTRUCTIONS IN APPENDIX A, AND

EMC INSTRUCTIONS IN APPENDIX C

Certified Compliant in the EC, when fitted in accordance with the installation instruc tions,
against the followi ng directives/standards :

Low Voltage Directive (73/23/EEC and amendment 93/68/EE C)

EN60950 : 1992 (Safety)

Electromagnetic Compatibility d irective (89/ 336 / EEC and su bsequent

amendments to date):

EN55022 : 1994 (Emissions)
EN50082-1 : 1992 (Immunity)

Telecommunications Terminal Equipment directive (91/263/EEC and

amendment 93/68/EEC) where indicated in approvals requirements section.

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Standalone G-Converter

Contents

Introduction..............................................................................................................................................7

Local Control............................................................................................................................... 7

Remote Control...........................................................................................................................7

Operating Modes.....................................................................................................................................8

Operating Mode 1.......................................................................................................................8

Operating Mode 2.......................................................................................................................8

Operating Mode 3.......................................................................................................................9

Operating Mode 4.......................................................................................................................9

G.703 Interface Presentation.................................................................................................................10

75 ohm operation......................................................................................................................10

120 ohm operation....................................................................................................................10

Selection and Configuration Of DCE Interface.......................................................................................11

X.21/V.11 Interface...................................................................................................................11

Control Of “I” Lead.......................................................................................................11

V.35 Interface............................................................................................................................11

Configuration Of V.35 Control Flags............................................................................12

Remote Loopback Function...................................................................................................................13

External Clock........................................................................................................................................14

External Clock without Autobauding.........................................................................................14

External Clock with Autobauding..............................................................................................14

Configuration..........................................................................................................................................15

DIL switch settings....................................................................................................................16

Default Unit Set-Up...................................................................................................................17

Front panel LED indicators........................................................................................................18

Diagnostics............................................................................................................................................19

Front Panel LEDs......................................................................................................................19

Seven Segment Display............................................................................................................19

Loopbacks................................................................................................................................19

Installation..............................................................................................................................................21

Supply Voltage and Connection................................................................................................21

Environmental Considerations..................................................................................................21

Mechanical Construction...........................................................................................................21

Back-To-Back Demonstration Connection.............................................................................................22

75 ohms BNC to PD7024 interfaces.........................................................................................22

120 ohms RJ45 twisted pair to CTR 12 interfaces....................................................................22

Appendix A - Warnings..........................................................................................................................23

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Standalone G-Converter

Appendix –B Approval Requirements....................................................................................................26

G.703/G.704.............................................................................................................................26

Appendix C – EMC Requirements.........................................................................................................27

Limitation of Emissions:............................................................................................................27

'D-Type' Connections...................................................................................................27

Appendix D -Location Of Switches and Links........................................................................................28

Appendix E - G.703 Interface Pin Outs..................................................................................................29

Appendix F - RJ45 E1 Crossover Cable................................................................................................30

Appendix G- X.21/V.11 DCE Pinout....................................................................................................... 31

Appendix H – V.35 DCE Pinout.............................................................................................................32

Appendix I – V.35 Stub Cable................................................................................................................33

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Standalone G-Converter

Introduction

This manual provides information covering installation and set-up procedures of the
converter.

A full set of cable pin-outs and a PCB layout (showing the location of switches and link
settings) are included in the appendices.

The G-Converter is an interface adapter that will convert between a G.703 /G.704 link and an
X.21/V.11 or V.35 interface. The intended use of this unit is to terminate a G.703/704 link;
DCE rates between zero and 2048kbps in 64k steps. Selection of these DCE rates is
conveyed across the G.703/G.704 link from the central site management unit by a proprietary
in-band signalling scheme.

An external clock input is provided on the DCE p ort to enable the G-Converter to be clock ed
from the connected DTE.

Configuration of the G-Converter is achieved in two simple stages involving internal and
external switches, and selection of internal links.

Local Control

When the converter is configured as Local (Internal switch: SW4, 1 = off) the DCE rates are
selected by using the two rotary switches, identified as XIO and X1, located on the front of
the unit. As each switch is rotated, using a screw driver, the relative position sets the number
“N” which is displayed on the seven-segment LED display. X10 selects tens, X1 selects
units, permitting selection of N =0 to a maximum of 32. When local mode is selected the
decimal point of the right hand digit of the seven-segment display is illuminated.

DCE rate allocation is N x 64kbps, so an indication of N = 23 signifies a DCE rate of
1472kbps. The information that N = 23 is encoded and transmitted across the link in time
slot 31.

Remote Control

When the converter is configured as Remote, (Internal switch SW4, 1 = on) the DCE rate is
controlled by the control information being received in time slot 31. Configuration of the
DCE speed on this remote unit is controlled by the ‘Local’ unit since the front panel switches
will be deactivated.

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Standalone G-Converter

Operating Modes

The equipment has four operating modes: Refer to the Switch and link location diagram in

Appendix D -Location Of Switches and Links.

Operating Mode 1

G.703 Transparent interface converter, data rate fixed at 2048kbps,

Remove the cover of the unit, locate Internal Switch 4 and set as follows:

SW4,1 SW4,2 SW4,3 SW4,4 SW4,5 SW4,6 SW4,7 SW4,8
NR NR NR NR NR OFF OFF OFF

N.B. NR = Not Relevant.

The external Loop switch (front panel) should be set as Normal.

In this mode the data is routed directly from the G.703 interface to the X.21/V.11 interface.
The rotary switch settings are ignored and time slot 31 is not monitored. In transparent mode
the G-Converter may be connected to other suppliers G.703 to X.21/V.11 converters.

Operating Mode 2

G.703 Interface, data rate configurable between Zero and 2048kbps.

Remove the cover of the unit, locate Internal Switch 4 and set as follows:

SW4,1 SW4,2 SW4,3 SW4,4 SW4,5 SW4,6 SW4,7 SW4,8

✷✷✷✷

N.B. NR = Not Relevant.
✷✷✷✷ When converters are to be set up as a pair, one unit MUST be configured as a Local unit

(SW4, 1 = Off) and the other a Remote unit (SW4, 1=On)

The external Loop switch (front panel) should be set as Normal.

In this mode DCE data rates may be selected between 0bps and 2048kbps in 64kbps steps. A
proprietary framing scheme is used to control the value of N.

It is recommended this mode is used only if data rates up to 2048kbps are required as a fault
condition on the G.703 link could force the DCE clock to operate at 2048kbps. If the user
equipment is only capable of running at say 256kbps then this may cause problems.

OFF OFF NR NR ON OFF OFF

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Standalone G-Converter

Operating Mode 3

G.703 Interface, data rate configurable between 0bps and 1984kbps

Remove the cover of the unit, locate Internal Switch 4 and set as follows:

SW4,1 SW4,2 SW4,3 SW4,4 SW4,5 SW4,6 SW4,7 SW4,8

✷✷✷✷

N.B. NR = Not Relevant.
✷✷✷✷ When converters are to be set up as a pair, one unit MUST be configured as a Local unit

(SW4, 1 = Off) and the other a Remote unit (SW4, 1=On)

The external Loop switch (front panel) should be set as Normal.

In this mode, data rates may be selected between 0bps and 1984kbps in 64kbps steps. A
proprietary framing scheme is used to control the value of N.

Use this mode if you are sure you will not want to use N = 32 (i.e. 2048kbps).

When operating in this mode, a fault condition on the G.703 link will for ce the DCE clock to
operate at 0kbps and display “Er” on the display.

Operating Mode 4

G.704 Interface, data rate configurable between 0bps and 1984kbps

Remove the cover of the unit, locate Internal Switch 4 and set as follows:

SW4,1 SW4,2 SW4,3 SW4,4 SW4,5 SW4,6 SW4,7 SW4,8

✷✷✷✷

N.B. NR = Not Relevant.
✷✷✷✷ When converters are to be set up as a pair, one unit MUST be configured as a Local unit

(SW4, 1 = Off) and the other a Remote unit (SW4, 1=On)

The external Loop switch (front panel) should be set as Normal.

In this mode, all speeds are possible between 0bps and 1984kbps in 64kbps steps. A
proprietary framing scheme is used to control the value of N.

Operating Mode 4 would be used if you were connected to a G.704 n etwor k. In this mode, a
fault condition on the G.704 link could force the DCE clock to operate at 0kbps and flash
“Er” on the display.

OFF ON NR NR ON OFF OFF

ON NR NR NR ON OFF OFF

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Standalone G-Converter

G.703 Interface Presentation

The converter may be configured to operate on either a 120 ohm balanced circuit impedance,
presented on an RJ45 connector or with a 75 oh m unbalanced impedance, presented on two
BNC connectors.

Selection of the interface is made by link settings – refer to Appendix D -Location Of

Switches and Links for the location diagram and use in conjunction with the tables below.

75 ohm operation

LINK
NUMBER

LK1 Connects BNC TX Fitted (ensure shorted pins run

LK5 Connects BNC RX Fitted (ensure shorted pins run

LK3 Determines TX transformer

LK4 Determines RX transformer

LK6 AC couples screen of RX

LK2 AC couples screen of TX

Notes:

*This setting is application dependent. Only one end of each link should be grounded to
prevent ground loops, therefore the position of these links needs to m ade in conjunction with
the installation grounding scheme.

120 ohm operation

LINK
NUMBER

LK1 Connects BNC TX Remove
LK5 Connects BNC RX Remove
LK3 Determines TX transformer

LK4 Determines RX transformer

LK6 AC couples screen of RX

LK2 AC couples screen of TX

FUNCTION SETTING

front to back of unit)

front to back of unit)
Positions 2 and 1

ratio

Positions 2 and 1

ratio

Position 2 and 3 for coupling *

BNC to gnd

BNC to gnd

FUNCTION LINK SETTING

ratio

ratio

BNC to gnd

BNC to gnd

Position 1 and 2 for no coupling*
Position 2 and 3 for coupling*
Position 1 and 2 for no coupling*

Positions 2 and 3

Positions 2 and 3

Position 1 and 2 for no coupling

Position 1 and 2 for no coupling

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Standalone G-Converter

Selection and Configuration Of DCE Interface

The DCE port of the G-Converter can be presented as either X.21/V.11 or V.35 Choice of
interface is made by link setting. The X.21/V.11 interface is presented on a 15-w ay D type
connector in accordance with ISO 4903. The V.35 interfac e is also presen ted on the same 15
way D-type connector. A converter cable is optionally available.

X.21/V.11 Interface

Selection of the interface is made by link settings – refer to Appendix D -Location Of
Switches and Links for the location diagram. To select the X.21/V.11 interface Link 9

jumper must be in the X.21 position. The connector pin out for the X.21 interface is given in
Appendix G

Control Of “I” Lead

When the X.21/V.11 interface is selected, the “I” lead function can be controlled. The “I”
lead status is synthesised by the converter since no information about the “I” lead status is
passed across the link. Status of the “I” lead is fixed. Four choices are available to the user.

Selection is made via switch settings. Refer to the location diagram in Appendix D -

Location Of Switches and Links

SW4, 4 SW4, 5 FUNCTION OF I LEAD

OFF OFF I follows C lead
OFF ON I = active
ON OFF I = inactive
ON ON I follows carrier

V.35 Interface

Selection of the interface is made by link settings – refer to Appendix D -Location Of
Switches and Links for the location diagram. To select the V.35 interface link 9 must be in

the V.35 position. The V.35 interface is presented on the 15 way D-type connector. Two
“control flags” are available as outputs and one “control flag” is available as an input. The
V.35 specification calls for the following Control signals;

V.35 CONTROL FLAG SIGNALS

Name Description Type at Connector Signal number

RTS Request To Send Input 105
CTS Clear To Send Output 106

DSR Data Set Ready Output 107

DCD Data Carrier Detect Output 109

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Standalone G-Converter

The G-Converters support one input flag and two output flags. It is up to the user which of
the signals is to be implemented. RTS would normally be the definition for Flag 1 I/P
(although is does not have to be) as this is the only I/P called up by the V.35 spec.

The two output flags, Flag 2 O/P and Flag 3 O/P can be assigned to either CTS, DSR or
DCD, the choice is at the discretion of the user.

The connector pin out for the V.35 interface is given in Appendix H and a suggested stub
cable converter to 34 pin MRAC is given in Appendix I – V.35 Stub Cable.

Configuration Of V.35 Control Flags

When the V.35 interface is selected the FLAG 1 O/P and FLAG 2 O/P can be individually
controlled. Four choices are available to the user.

Selection is made via switch settings. Refer to the location diagram in Appendix D -

Location Of Switches and Links.

SW4, 4 SW4, 5 FUNCTION OF O/P

FLAG 1

OFF OFF FLAG 1 O/P follows

FLAG 3 I/P
OFF ON FLAG 1 O/P = active
ON OFF FLAG 1 O/P = inactive
ON ON FLAG 1 O/P follows

carrier

SW5, 2 SW5, 3 FUNCTION OF FLAG 2

O/P

OFF OFF FLAG 2 O/P follows

FLAG 3 I/P
OFF ON FLAG 2 O/P = active
ON OFF FLAG 2 O/P = inactive
ON ON FLAG 2 O/P follows

carrier

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Standalone G-Converter

Remote Loopback Function

If the stand-alone G-Converter has SW5, 1 to off, the Manager card located in the card cage
may select a remote loopback. Once this state has been entered, it will remain in loopback
for approximately 3 minutes. Whilst in loop back, the LED display will flash “rL”, the data
and clock being outputted through the DCE port will be suppressed and the data arriving at
the X.21/V.35 drivers/receivers will be looped back to the central site.

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Standalone G-Converter

External Clock

The G-Converters have the ability to use as its clock source a clock supplied from the
connected DTE. An external clock is supplied externally to t he converter via the EXT clock
pins, of the 15 way D type connector (pins 7 and 14). Whenever an external clock is used,
the rightmost decimal point of the seven-segment display is illuminated.

The two external clock modes are :-

External Clock without Autobauding

This mode is selected by switching SW4,7 to On and SW5,4 to OFF. In this mode the
external clock being supplied must be 2048Kbps +/- 50 ppm and the jitter content compliant
with the requirements of TBR12 and PD 7024. The function of the G-Converter in this mode
is identical to operation with recovered clock (normal operation) with the exception that the
clock source is from the external clock and not the G.703/4 link.

In this mode, if the received clock Frequency is grossly Out of spec (or absent) then the
letters “Fo” will be alternately flashed with the N value on the LED display. At all times the
assumption is made that the clock being supplied to the G-Converter from the G.703/4
network is as per TBR12/PD7024 requirement.

When this mode is selected and operating correctly, the display should be steady with the
rightmost decimal point flashing.

External Clock with Autobauding

This mode is selected by switching SW4,7 to On and SW5,4 to ON. In this mode the
external clock, being supplied must be Nx 64Kbps +/- 50 ppm and the jitter content
compliant with the requirements of TBR12 and PD 7024. The function of the G-Converter in
this mode will measure the external clock and set the operation of the G-Converter to this
speed. In this mode, the unit will become a Local.

In this mode, if the received clock Frequency is grossly Out of spec (or absent) then the
letters “Fo” will be alternately flashed with the N value on the LED display. The N value will
still be derived from the external clock and the data will be clocked out of the DCE with this
clock, however the G.703/4 link will be clocked from the G.703/4 recovered 2048Kbps
clock. At all times the assumption is made that the clock being supplied to the G -Converter
from the G.703/4 network is as per TBR12/PD7024 requirement.

When this mode is selected and operating correctly, the display should be steady (indicating
the external clock speed) with the rightmost decimal point flashing.

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Standalone G-Converter

Configuration

Configuration of the G-Converters is achieved in two simple stages involving internal and
external switches, and setting of some internal links. Refer to Appendix D -Location Of
Switches and Links for details of Internal Switch and link locations.

Selection of internal links permit the converters to operate either as a Local or Remote unit.
Rotation of the two external switches release bandwidth in Nx64k allocations. An LED
display will confirm the link rate selected.

Notes:

1

Front panel switches are disabled when Remote is selected on a unit.

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Standalone G-Converter

DIL switch settings

The mode of operation is set up using the DIL switches SW4 and SW5.

SW POSITION FUNCTION SETTING

SW4, 1 Selects either remote

operation or local operation

SW4, 2 Selects interface type Off = G.703

SW4, 3 Allows unframed operation On = unframed operation not permitted

SW4, 4
SW4, 5

Sets up operation of X.

When X.21/V.11 interface
set.
X= I lead
Y= C lead.

When V.35 interface set

X= FLAG 1 O/P,
Y= FLAG 3 I/P

SW4, 6 Sets G-Converter to

permanent
Transparent mode 2048kbps

SW4, 7 Sets G.70x TX off if no

G.703 RX detected

SW4, 8 Use External Clock3 On = Use external clock. Off = do not

SW5,1 Enables Remote Loopback

function
SW5, 2
SW5, 3

Sets up operation of FLAG 2

O/P “X “ when set for V.35

interface

SW5,4 Sets Autobauding on or off Off = Autobauding not selected

Factory default switch settings – 75 Ohm

Off = local
On = remote

On = G.704

Off = unframed operation permitted1
SW4, 4 = off, SW4, 5 = off,
X follows Y
SW4, 4 = on, SW4, 5 = on,
X follows Carrier
SW4, 4 = off, SW4, 5 = on,
X = active
SW4, 4 = on, SW4, 5 = off,
X = inactive

Off = permanent straight through
On = framed/unframed

Off=G.703 TX enabled always.
On = G.703 TX disabled in the event of
G.703 RX not being present

use external clock.
Off = Remote loop back enabled.
On = Remote loop back disabled
SW5, 2 = off, SW5, 3 = off,
X follows Flag3 I/P
SW5, 2 = on, SW5, 3 = on,
X follows Carrier
SW5, 2 = off, SW5, 3 = on,
X = active
SW5, 2 = on, SW5, 3 = off
X = inactive

On = Autobauding selected
N.B for Autobauding SW4,8 must be
set to on

2

4

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Standalone G-Converter

Notes:

1

Only allow unframed operation if a DCE speed of 2048Kbps will not “harm” the DTE.

2

Use this mode if no in-band management is required and the link is required to run a
permanent 2048Kbps. Also, use this mode if interfacing to another manufacturers
G.703/X.21 interface converter.

3

When an external clock is used it must be 2048Kbps +/- 50ppm as per TBR12/PD7024 for

non Autobauding operation or Nx64Kbps +/- 50ppm for auto baud operation.

4

Use this option if it is required to suppress TX data in the event of loss of RX data from the

G.70x link.

Default Unit Set-Up

When delivered, the G-Converter is set to operate as follows:

Interface selected : X.21 (LK9 to X.21 position)
Local/Remote : Local (SW4, 1 = off)
G.703/G.704 Interface : G.703 (SW4, 2 = off)
Allow Unframed : Yes (SW4, 3 = on)
I Lead Control : Follow Carrier (SW4,4=SW4,5 = on)
Permanent Straight Through : Not selected (SW4, 6 = on)
G.70x TX : Always enabled (SW4, 7 = off)
External Clock : Not selected (SW4,8 = off)
Remote loopback : Enabled(SW5,1 = off)
Autobauding : Not selected (SW5,4 = off)

Interface Impedance : 75 Ohms (Un-balanced) see table

above in G.703 interface

presentation section.

Front Panel loop switch enabled : Enabled (LK12 position 1 and 2)
Front panel loop switch : Off (centralised)

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Standalone G-Converter

Front panel LED indicators

The G-Converter has 4 LED indicators: -

LED LABEL CONDITION NOTES

CARRIER ON

OFF

RX Carrier established

No RX Carrier established.

LOOP ON

OFF

ERROR OFF

Brief flash

ON

POWER ON

OFF

Either a Local loop or a remote
loop mode has been entered.
(check position of loop control
switch SW)

Normal Operation
Normal operation

CRC4 error detected

No framing synch found when
Operating on a G.704 network.
The G-Converter is receiving a
regulated +5V from its power
supply.

The G-Converter is not receiving a
regulated +5V from its power
supply

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Standalone G-Converter

Diagnostics

Front Panel LEDs

On the front panel, only the CARRIER LED and POWER should normally be illuminated.
When the G-Converter is disconnected from the network or has lost carrier the CARRIER
LED will extinguish.

Seven Segment Display

The seven segment LED display can reveal the state of the G-Converter. In normal
operation, the display should be steady indicating the N value of the DCE data rate selected.

If the display flashes “Er” then either the G.703 carrier is lost or the framing can not be
recovered from the incoming data stream. This will depend on the G-Converter set up and
the type of network that it is connected to.

If the display flashes “rL”, then a remote loopback has been initiated f rom a rack mounted G­Converter card. In this mode the clock and data are suppressed from the DCE connector.
The DCE data being internally looped back to the rack mounted G-Converter card.

If the display flashes “ Fo” this m eans that an external clock mode has be en selected and the
Frequency of the external clock is grossly Out of range.

If the right most decimal point is permanently on, then the G-Converter has either b een set to
be a local unit or it is in local loopback (front panel toggle switch set to the left). If this
decimal point is flashing then the G-Coverter is in an external clock mode.

Loopbacks

The loopback switch is located on the front panel. This switch can be disabled by moving
LK12 jumper to position 2-3. In normal operation, the switch is set in a central position, and
the LOOP LED indicator is not illuminated.

When set to local loop back the received data and transmit data of the X.21 interface are
looped. The DCE clock speed will always be determined by the rotary switch settings
regardless if the unit is set for remote operation.

When set to network loop back the transmit data (TXD) of the G.70x interface is looped
directly to the received data (RXD) of the G.70x interface. The DCE clock speed is
determined by the rotar y switches in the case of a local unit and by the data being receiv ed in
time slot 31 in the case of a remote unit.

It is possible to apply loop backs either at the X.21 side of the converter or the G.703 link
interface side of the converter. Simple functionality tests may be performed on a single G­Converter whilst disconnected from the Network.

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Standalone G-Converter

A BERT tester configured, as a DTE capable of generating test patterns should be connected
to the “DCE” port of the G-Converter.

With the link interface disconnected, the LOOP switch on the energised G-Converter set to
Local, the BERT tester will detect the clock being gener ated by the G-Converter and if the
unit is operating correctly the looped back data should be error free. The clock speed will be
determined by the switch setting.

Ensure that the “DCE” port is providing data rates between 0 and 2048Kbps by selecting 0 to
31 with the front panel switches. Note that during switching of DCE speed errors may be
generated. This is acceptable as long as when the speed setting is in a steady state no errors
are detected.

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Standalone G-Converter

Installation

Before installation, please refer to the safety warnings, approvals requirements and
EMC requirements in the appendices.

Supply Voltage and Connection

240V AC.

The Converter is AC powered by a “plug in” switched mode po wer supply that is provided
with the unit.

Environmental Considerations

The equipment must be operated under the following atmospheric conditions:

Temperature: 0 to 40 degrees centigrade.
Humidity: 0% to 90% non-condensing.

Mechanical Construction

The converter is housed in a plastic injection moulded enclosure. Four LEDs on the front
panel indicate the current status of the converter.

The G-Converter MUST be disconnected from th e power supply before opening the unit or
changing any network connections.

Screws on the underside of the enclosure are removed using a Posidrive screwdriver to access
the interior.

The rear panel accommodates the link interface connectors, the D t ype 15 way socket fo r the
X.21 port and the regulated power supply connector.

For U.K. connection, screened BNC cables should be used, with the screen connected to
chassis at the TX connector only.

For EUROPEAN connection, un-screened RJ45 cables are suitable. The screen to chassis
links must be fitted in the isolated position.

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Standalone G-Converter

Back-To-Back Demonstration Connection

For a simple demonstration, or local network use, two converters may be connected ‘back t o
back’, using a cross over cable arrangement, one unit will automatically adopt the role of
clock master the other clock slave.

75 ohms BNC to PD7024 interfaces

For UK interfaces a pair of 75 Ohm BNC cables should be used, connecting TX on one unit
to RX on the other and visa versa.

120 ohms RJ45 twisted pair to CTR 12 interfaces

For European interfaces an RJ45 crossover cable should be used, as described in the
Appendices.

Set both units to X.21 interface (LK 9 to X.21 position).

Set one of the units to local (SW4, 1 = off) and the other to remote (SW4, 1 = on).

Select G.703 mode with unframed allowed and I lead following C. SW4, 2 = off, SW4, 3 =
off, SW4, 4 = SW4, 5 = off, SW4, 6 = on, SW4, 7 = SW4, 8 = off.

Connect an X.21 loop back connector to the G-Converter that is set up as remote. Connect a
Bert tester capable of running up to 2048Kbps c onfigured as a X.21 DTE to the G-Converter
that is configured as local.

Commence passing data. Notice that the data rate is controlled by the rotary switch position
of the local unit and independent of the remote unit. Demonstrate all speeds from N = 0
(0bps) to N= 32 (2048Kbps).

Now change SW4, 2 = on, on both converters. This selects the link interface to be G.704.
Framed data must always be present. Demonstrate that the maximum value for N is now 31
and that when the G.704 interface is disconnected the seven-segment display shows “Er”
(because no framing is detected).

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Standalone G-Converter

Appendix A - Warnings

WARNING: THIS EQUIPMENT MUST BE EARTHED/

GROUNDED VIA THE SCREEN OF THE X.21 DTE
LEAD

This equipment relies on the EARTH/GROUND connection to ensure

EMC compliance. It must not under any circumstances be operated
without an earth connection, which could nullify its approval.

WARNING: INSTALLATION OF EQUIPMENT

Installation of this equipment must only be performed by suitably

trained service personnel.

This equipment allows connection only of suitably approved

equipment to it s port s , the safety st at us of which are defined belo w.

SELV Ports:
i) DC Power

ii) “To DTE”

The above named ports are classified as SELV (Safety Extra Low

Voltage) in accordance with in Clause 2.3 of EN60950 (BS7002, IEC950
as applicable), and must only be connected to equipment which similarly
complies with the SELV safety classification. The DC power port must

only be connected to the supplied p ower modu le.

TNV Ports:
i) Euro 120 ohm RJ 45

ii) 75 ohm BNC

The above named ports are classified as TNV (Telecom Network

Voltage) in accordance with Clause 6 of EN60950 (BS7002, IEC950 as
applicable), and must on ly be connected to equipment which similarly
complies with the TNV safety classification.

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Standalone G-Converter

WARNUNG: ZUR EINHALTUNG DER EMC BESTIMMUNGEN MUSS

DIESES GERÄT ÜBER DEN SCHIRM DER X.21
SCHNITTSTELLE GEERDET WERDEN. DAS GERÄT DARF

NICHT OHNE DIESE ERDUNG BETRIEBEN WERDEN..

Das G-Converter wird von einer externen

Stromversorgungseinheit versorgt – diese ist nur für die
Verwendung zusammen mit einem G-Converter Konverter
geprüft. Die Verwendung einer anderen Stromversorgung hat die
Erlöschung der Sicherheits-/EMC zur Folge. Das G-Converter ist
ein Klasse II Produkt und muss deswegen nicht über eine
Schutzerdung zur Vermeidung von Stromschlägen verfügen.
Dieser Schutz wird durch das Netzteil selbst gewährleistet.
Trotzdem ist es aus EMC Erfordernissen her nötig, eine Erdung
über den Schirm des X.21/V.11 Kabels heranzuführen. Das am G­Converter angeschlossene Datenendgerät muss eine
Erdverbindung zum Schirm des X.21/V.11 Kabels bieten. Niemals
sollte das G-Converter ohne diese Erdverbindung betrieben
werden.

WARNUNG: INSTALLATION DES GERÄTES

Die Installation des Gerätes darf nur von entsprechend

ausgebildetem und autorisiertem Personal durchge führt werden.

Das Gerät ermöglicht den Anschluss von Endgeräten, deren
Sicherheitsstatus den folgenden Definitionen zu entsprechen hat:

SELV Ports:

i) X.21/V.11 Endgeräteanschluss
ii) DC Stromversorgungsanschluss

Die oben aufgeführten Ports sind als SELV (Safety Extra Low Voltage) in
Übereinstimmung mit Klasse 2.3 der Verordnung EN60950 (BS7002/IEC 950 soweit
anwendbar) klassifiziert und dürfen nur mit Geräten zusammengeschaltet werden, die
ebenfalls dieser Bestimmung entsprechen.

TNV – 1 Ports:

i) Euro 120 Ohm RJ45
ii) 75 Ohm BNC

Die oben aufgeführten Ports sind als TNV-1 (Telecoms Network
Voltage) in Übereinstimmung mit Klasse 2.3 der EN60950
(BS7002/IEC 950 anwendbar) klassifiziert und dürfen nur mit
Geräten zusammengeschaltet werden, die dieser Bestimmung
entsprechen.

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MISE EN GARDE: CET ÉQUIPEMENT DOIT ÊTRE RELIÉ A LA

TERRE/MASSE PAR LE BLINDAGE DU FIL

DTE X.21

Pour garantir la conformité EMC de cet équipement, il doit

impérativement relié à TERRE/MASSE. En aucun cas, il ne doit
être utilisé sans connexion à la terre sous peine d’annuler sons
agrément.

MISE EN GARD E: IN STAL LATION D E L'ÉQU IPM ENT

L'installation de cet équipment doit être assuré uniquement par un

personnel formé pour ce type de matériel.

Ne connectez que des équipments agréés sur les ports de cet appareil

en respectant les conditions de sécurité définies ci-après:

Ports SELV:
i) Alimentation en courant continu

ii) “Vers DTE”

Les ports désignés ci-dessous sont classifiés dans la catégorie SELV

(Safety Extra Low Voltage = sécurité sous tension ultra-basse)
conformement à la Clause 2.3 de la norme EN60950 (BS7002,
IEC950 si applicable) et doivent être connectés uniquement sur des
équipements pareillement conformes à la classification de sécurité
SELV. L’alimentation en courant continu doit être connecté

uniquement sur le mod ul e d’ ali men ta tion fourni.

Ports TNV:

i) RJ45 120 ohms Euro
ii) BNC 75 ohms

Les ports ci-dessous sont classés dans la catégorie TNV (Telecom

Network Voltage = tension réseau télécom) conformement à la
Clause 6 de la norme EN60950 (BS7002, IEC950 si applicable) et
doivent être connectés uniquement sur des équipements
pareillement conformes à la c lassi ficatio n de séc urité TNV.

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Standalone G-Converter

Appendix –B Approval Requirements

The G-Converter carrying the BABT/CE168 assessment symbols and approval number, is
approved for connection to the networks i dentified i n th is A ppend ix as fol low s:

G.703/G.704

In the UK, to PD7024 (75 Ohm Un-balanced) via 2 x BNC connectors. The internal jumper
links must be set to the 75 R pos ition, as detailed in the ins tallati on ins tructions .

Throughout Europe (Pan European) to CTR12 and CTR13 via RJ45 Connector (120 Ohms
Balanced). The internal jumper links must be set to the 120R position, as detailed in the
installation instr uc ti ons.

When using an external clock the frequency and jitter characteristics must be compliant with
TBR12/PD7024.

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Appendix C – EMC Requirements

To ensure compliance with the EMC directive, some care must be taken to ensure that the units
are installed properly, using suitable c ab le s and c o n ne ction s. The fo llow ing must be o bser ved :

Limitation of Emissions:

'D-Type' Connections

This product relies on the use of screened cables for connection to the 15 way 'D-Type' ports.
The cables must have the foil or braid screen connected effectively to the metal headshell to
ensure continued compliance. These headshells are available from Black Box under the
following part numbers:

DB15 - FA033

DB25 - FA031

The diagram below illustrates an example of a suitable screen connection. Note how the foil or
braid screen is bent back over the 'C' clip to achieve a pressure contact of the screen against the
shell:

It is important to keep the screen to shell connection as sh ort as pos sib le.

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Standalone G-Converter

Appendix D -Location Of Switches and Links

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Appendix E - G.703 Interface Pin Outs

COMPOSITE INTERFACE CONNECTIONS (EUROPE)

USING 120 OHM BALANCED RJ45

Name Description Type at Connector DTE – RJ45

RxA RX Pair Input 1

RxB RX Pair Input 2
TxA TX Pair Output 4
TxB TX Pair Output 5

S1 Shield Reference - 3
S2 Shield Reference - 6

COMPOSITE INTERFACE CONNECTIONS (UK)
USING 75 OHM UN-BALANCED BNC

Name Description Type at Connector DTE – BNC

RxA Input Centre RX

RxB

TxA Output Centre TX
TxB

RX Pair

TX Pair

Ground

Reference

Ground

Reference

Outer RX

Outer TX

Female

Female

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Standalone G-Converter

Appendix F - RJ45 E1 Crossover Cable

RJ45 CROSSOVER CABLE (EUROPE)

USING 120 OHM BALANCED RJ45

Name Description DTE2 – RJ45 Male DTE1 – RJ45 Male

TxRxA 4 1
TxRxB
RxTxA 1 4
RxTxB

S1 Shield Reference 6 3
S2 Shield Reference 3 6

Notes:

Link strap must be fitted in 120 position and not in 75 position.

LK1 and LK5 must be removed (Isolated).

TXRX Pair

RXTX Pair

5 2

2 5

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Appendix G- X.21/V.11 DCE Pinout

15 Way D Type female Configured as DCE

DATA CHANNEL CONNECTIONS

Name Description Type at Connector DCE – DB15

Female

Protective Ground - 1
G Signal Ground - 8
T(A) TxDa Input 2
T(B) TxDb Input 9
R(A) RxDa Output 4
R(B) RxDb Output 11
S(A) Clock a Output 6
S(B) Clock b Output 13
I(A) Indicate a Output 5
I(B) Indicate b Output 12
C(A) Control a Input 3
C(B) Control b Input 10
X(A) Ext Clock a Input 7
X(B) Ext Clock b Input 14

Notes:

Connector shell and termination must be as specified in the EMC section contained in

Appendix C – EMC Requirements.

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Standalone G-Converter

Appendix H – V.35 DCE Pinout

15 Way female D type configured as DCE

DATA CHANNEL CONNECTIONS

Number Name Type at Connector DCE – DB15

Female

- Protective Ground - 1

102 Signal Ground Bidirectional 8

See note 1 Flag 3 I/P V.28 Input 15

113 ExtClk(A) V.11 Input 7
113 ExtClk(B) V.11 Input 14
115 RXClk(A) V.11 Output 6
115 RXClk(B) V.11 Output 13
114 TXClk(A) V.11 Output 5
114 TXClk(B) V.11 Output 12
104 RX(A) V.11 Output 4

104 RX(B) V.11 Output 11
See note 2 Flag 1 O/P V.28 Output 3
See note 2 Flag 2 O/P V.28 Output 10

103 TXD(A) V.11 Input 2

103 TXD(B) V.11 Input 9

Note 1. Input flag can be configured to be any V.28 input (to DCE) i.e. Request To Send
RTS (105).

Note 2 Output Flags can be configured to any V.28 outputs (from DCE) i.e. Clear To Send
CTS (106), Data Set Ready DSR (107) Data Carrier Detect DCD (109).

Connector shell and termination must be as specified in the EMC section contained in

Appendix C – EMC Requirements

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Standalone G-Converter

Appendix I – V.35 Stub Cable

V.35 Stub cable

15 way D type

connector Male

1 Protective Ground - Shield
8 Signal Ground Bidirectional B

15 RTS(Flag 3 I/P) V.28 Input C

7 ExtClk(A) V.11 Input U

14 ExtClk(B) V.11 Input W

6 RXClk(A) V.11 Output V

13 RXClk(B) V.11 Output X

5 TXClk(A) V.11 Output Y

12 TXClk(B) V.11 Output AA

4 RX(A) V.11 Output R

11 RX(B) V.11 Output T

3 RFS (Flag 1 O/P) V.28 Output D

10 DSR(Flag 2 O/P) V.28 Output E

2 TXD(A) V.11 Input P
9 TXD(B) V.11 Input S

Connector shell and termination must be as specified in the EMC section contained in

Appendix C – EMC Requirements

Name Type MRAC 34 pin

Female

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