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# RAD DATA COMMUNICATIONS
SRM-31A
Card Type Short Range Modem
Chip Set Unidentified
I/O Options 25-pin DTE port, terminal block
Wiring Type Unshielded twisted pair
Maximum Data Rate 115.2Kbps
Data Modulation Protocol 2B1Q
Data Bus External
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| DTE serial port | CN1 | Terminal block | CN2 |
| (25-pin connector) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+--------+--------+------------------------------------|
| LOS | Red | On | Loss of signal condition detected |
| | | | on network |
|-----+--------+--------+------------------------------------|
| LOS | Red | Off | Loss of signal condition not |
| | | | detected on network |
|-----+--------+--------+------------------------------------|
| TST | Red | On | Device is conducting a loopback |
| | | | test |
|-----+--------+--------+------------------------------------|
| TST | Red | Off | Device is not conducting a |
| | | | loopback test |
|-----+--------+--------+------------------------------------|
| RX | Yellow | On | Data is being received |
|-----+--------+--------+------------------------------------|
| RX | Yellow | Off | Data is not being received |
|-----+--------+--------+------------------------------------|
| TX | Yellow | On | Data is being transmitted |
|-----+--------+--------+------------------------------------|
| TX | Yellow | Off | Data is not being transmitted |
|-----+--------+--------+------------------------------------|
| PWR | Green | On | Power is on |
|-----+--------+--------+------------------------------------|
| PWR | Green | Off | Power is off |
+------------------------------------------------------------+