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FCD-2 (X.21)

RAD DATA COMMUNICATIONS

FCD-2 (X.21)

Card Type

E1 LTU

Chip Set

Unidentified

I/O Options

AC power connector, X.21 DTE port, serial port,

E1 network interface via 15-pin connector, BNC connectors (2)

E1 Transfer Rate

2.048Mbps

E1 Protocol

HDB3

Frame Type

CRC-4

Data Bus

External

CONNECTIONS

Function

Label

Function

Label

AC power connector

CN1

LTU board connector

J3

Serial port

CN2

LTU board connector

J4

15-pin X.21 DTE port

CN3

Power switch

SW2

15-pin E1 PORT

CN4

BNC connector - receive

RX

LTU board connector

J2

BNC connector - transmit

TX

Note:

Jumpers must be installed on pins 1&2 and 3&4 of connectors J3 & J4 to maintain signal path continuity when the LTU board is removed.

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Debug self test mode disabled

JP2

Pins 1 & 2 closed

 

Debug self test mode enabled

JP2

Pins 2 & 3 closed

Default password enabled. Password=FCD-12

JP3

Pins 2 & 3 closed

 

User password enabled

JP3

Pins 1 & 2 closed

Watchdog timer enabled

JP4

Pins 1 & 2 closed

 

Watchdog timer disabled

JP4

Pins 2 & 3 closed

Signal ground is connected to the frame ground

JP12

Pins 2 & 3 closed

 

Signal ground is not connected to the frame ground

JP12

Pins 1 & 2 closed

Internal -5V enabled

JP22

Pins 1 & 2 closed

 

Grounded to pin 15 in the main link connector (CN4)

JP22

Pins 2 & 3 closed

Transmit side ground reference set for balanced interface

JP23

Open

 

Transmit side ground reference set for unbalanced interface

JP23

Closed

Frame ground is connected to main link ground reference

JP24

Closed

 

Frame ground is not connected to main link ground reference

JP24

Open

Allows connection of the line controlled by JP22 to pin 15 of main link connector (CN4) for powering external device

JP25

Closed

 

Does not allow connection of the line controlled by JP22 to pin 15 of main link connector (CN4) for powering external device

JP25

Open

Allows connection of internal +5V, via resistor, to pin 14 of main link connector (CN4) for powering external device

JP26

Closed

 

Does not allow connection of internal +5V, via resistor, to pin 14 of main link connector (CN4) for powering external device

JP26

Open

Receive side ground reference set for balanced interface

JP27

Open

 

Receive side ground reference set for unbalanced interface

JP27

Closed

TERMINATION

Function

JP18

JP19

JP20

JP21

Balanced interface compatibility enabled

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

 

Unbalanced interface compatibility enabled

Pins 2 & 3

Pins 2 & 3

Pins 2 & 3

Pins 2 & 3

Note: Pins designated are in the closed position

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

RTS

Unidentified

On

Control input line in X.21 DTE port is high

RTS

Unidentified

Off

Control input line in X.21 DTE port is low

DCD

Unidentified

On

Indication output line in X.21 DTE port is high

DCD

Unidentified

Off

Indication output line in X.21 DTE port is low

TD

Unidentified

On

Device is detecting pulses from the local DTE

TD

Unidentified

Off

Device is not detecting pulses from the local DTE

RD

Unidentified

On

Device is receiving pulses from network

RD

Unidentified

Off

Device is not receiving pulses from network

LOC

Unidentified

On

Local synchronization lost

LOC

Unidentified

Off

Local synchronization OK

REM

Unidentified

On

Remote synchronization lost

REM

Unidentified

Off

Remote synchronization OK

TST

Unidentified

On

Device loopback test active

TST

Unidentified

Off

device loopback test not running

LTU BOARD

CONNECTIONS

Function

Label

Function

Label

Mainboard connector

J5

Mainboard connector

J7

Mainboard connector

J6

   

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Factory configured - do not alter - transmit side ground reference

JP5

Open

Factory configured - do not alter - receive side ground reference

JP6

Open

E1 OUTPUT LEVEL SELECTIO

Net build

Label

Position

0dB

SW1

1

 

-7.5dB

SW1

2

 

-15dB

SW1

3