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# RAD DATA COMMUNICATIONS
ASM-20 G.703
Modem Type Data (Synchronous)
Maximum Data Rate 64Kbps
Data Bus External
Data Modulation Protocol Proprietary
IMG IMG 1
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+