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ASM-20 G.703

RAD DATA COMMUNICATIONS

ASM-20 G.703

Modem Type

Data (Synchronous)

Maximum Data Rate

64Kbps

Data Bus

External

Data Modulation Protocol

Proprietary

CONNECTIONS

Purpose

Location

Purpose

Location

G-703

CN1

Diagnostic test switch

DIG

AC power

CN2

Analog loopback switch

ANA

Ground

GND

Remote loopback switch

REM

Receive

RCV

Test pattern

PATT

Transmit

XMT

   

CD SIGNAL

Setting

JP1

CD normal

Pins 2 & 3 closed

CD forced high

Pins 1 & 2 closed

CHASSIS TO SIGNAL GROUND

Setting

JP6

Connected

Pins 2 & 3 closed

Disconnected

Pins 1 & 2 closed

ENABLE PUSHBUTTONS

Setting

JP5

DIG, ANA, REM, PATT enabled

Pins 1 & 2 closed

Disabled

Pins 2 & 3 closed

JITTER FILTER

Setting

JP8

Enabled

Pins 1 & 2 closed

Disabled

Pins 2 & 3 closed

RECEIVE IMPEDANCE

Setting

JP4

135omhs

Pins 1 & 2 closed

Low

Pins 2 & 3 closed

TRANSMIT IMPEDANCE

Setting

JP3

135omhs

Pins 1 & 2 closed

Low

Pins 2 & 3 closed

TRANSMIT LEVEL

Setting

JP2

0dBm

Pins 2 & 3 closed

-6dBm

Pins 1 & 2 closed

V.54 DELAY

Setting

JP7

On

Pins 2 & 3 closed

Off

Pins 1 & 2 closed

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

PWR

Green

On

Power is on

PWR

Green

Off

Power is off

RTS

Yellow

On

Request to Send enabled

RTS

Yellow

Off

Request to Send disabled

TD

Yellow

On

Modem is transmitting steady SPACE

TD

Yellow

Off

Modem is not transmitting data

TD

Yellow

Blinking

Modem is transmitting data

RD

Yellow

On

Modem is receiving steady SPACE

RD

Yellow

Off

Modem is not receiving data

RD

Yellow

Blinking

Modem is receiving data

DCD

Yellow

On

Carrier signal detected

DCD

Yellow

Off

Carrier signal not detected

TEST

Red

On

Modem in test mode

TEST

Red

Off

Modem not in test mode

ERR

Yellow

On

Errors in test pattern

ERR

Yellow

Off

Good test pattern