|
|
Table B-1 lists the control signal name, usage, and pinouts used on the DB-25 connector for the various interfaces supported by the FastPAD.
| DB 25 PIN | |||||
|---|---|---|---|---|---|
| CCITT Circuit | Function | Abbreviation | V.28 | V.35 | X.21 bis V.10/V.11 |
Shield | Cable Screening | FG | 1 | 1 | 1 |
CT102A | Signal Ground | GND | 7 | 7 | 7 |
CT102B | Common Ground |
|
|
| 10 |
CT103A | Transmitted Data | TD | 2 | 2 | 2 |
CT103B | Transmitted Data | TD |
| 14 | 14 |
CT104A | Received Data | RD | 3 | 3 | 3 |
CT104B | Received Data | RD |
| 16 | 16 |
CT105A | Request to Send | RTS | 4 | 4 | 4 |
CT105B | Request to Send | RTS |
|
| 23 |
CT106 | Clear to Send | CTS | 5 | 5 | 5 |
CT107 | Data Set Ready | DSR | 6 | 6 | 6 |
CT108 | Data Terminal Ready | DTR | 20 | 20 | 20 |
CT109A | Data Carrier Detector | DCD | 8 | 8 | 8 |
CT109B | Data Carrier Detector | DCD |
|
| 9 |
CT111 | Data Rate Selector (DTE) | DRS | 23 |
|
|
CT116 | Stand-by Select |
| 9 |
|
|
CT114A | Transmit Clock | TC | 15 | 15 | 15 |
CT114B | Transmit Clock | TE |
| 13 | 13 |
CT115A | Receive Clock | RC | 17 | 17 | 17 |
CT115B | Receive Clock | RE |
| 12 | 12 |
CT117 | Standby Indicator | SI | 10 |
|
|
CT140 | Remote Interface Loop (loop 2) | RIL | 21 |
| 21 |
CT141 | Local Line Loop (loop 3) | LL | 18 |
| 18 |
CT142 | Test Indicator | TI | 25 |
| 25 |
Table B-2 lists the FastPAD control signal pinouts.
| DB 25 Pin | |||
|---|---|---|---|
| CCITT Circuit | Function | X.21 | X.24 circuit X.21 physical interfaces |
Shield | Cable Shielding | 1 | sp |
CT102A | OV | 7 | G |
CT102B | OV | 7 | G |
CT103A | Transmission | 2 | TA |
CT103B | Transmission | 14 | TB |
CT104A | Reception | 3 | RA |
CT104B | Reception | 16 | RB |
CT105A | Control | 4 | CA |
CT105B | Control | 23 | CB |
CT109A | Indication | 8 | IA |
CT109B | Indication | 9 | IB |
CT114A | Clock | 15 | SA |
CT114B | Clock | 13 | SB |
Posted: Thu Jan 25 13:34:39 PST 2001
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