(At the DTE)
(At the DCE)
37 PIN D-SUB MALE at the DTE (Computer).
37 PIN D-SUB FEMALE at the DCE (Modem).
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | GND | Shield Ground | |
| 2 | SRI | Signal Rate Indicator | |
| 3 | n/c | - | Spare |
| 4 | SD | Send Data | |
| 5 | ST | Send Timing | |
| 6 | RD | Receive Data | |
| 7 | RTS | Request To Send | |
| 8 | RR | Receiver Ready | |
| 9 | CTS | Clear To Send | |
| 10 | LL | Local Loopback | |
| 11 | DM | Data Modem | |
| 12 | TR | Terminal Ready | |
| 13 | RR | Receiver Ready | |
| 14 | RL | Remote Loopback | |
| 15 | IC | Incoming Call | |
| 16 | SF/SR | Select Frequency/Select Rate | |
| 17 | TT | Terminal Timing | |
| 18 | TM | Test Mode | |
| 19 | GND | Ground | |
| 20 | RC | Receive Twister-Pair Common | |
| 21 | GND | Spare Twister-Pair Return | |
| 22 | /SD | Send Data TPR | |
| 23 | GND | Send Timing TPR | |
| 24 | GND | Receive Timing TPR | |
| 25 | /RS | Request To Send TPR | |
| 26 | /RT | Receive Timing TPR | |
| 27 | /CS | Clear To Send TPR | |
| 28 | IS | Terminal In Service | |
| 29 | /DM | Data Mode TPR | |
| 30 | /TR | Terminal Ready TPR | |
| 31 | /RR | Receiver TPR | |
| 32 | SS | Select Standby | |
| 33 | SQ | Signal Quality | |
| 34 | NS | New Signal | |
| 35 | /TT | Terminal Timing TPR | |
| 36 | SB | Standby Indicator | |
| 37 | SC | Send Twister Pair Common |