256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)
Table
when
SIGNAL | LEAD | DB25 | M/34 | |
NAME (ABBREV.) | CIRCUIT | TYPE | (RACK- | (NORM. |
|
|
| NEST) | V.35) |
|
|
| PIN | PIN |
|
|
|
|
|
Frame (Protective) Ground (FGND) | 101 |
| 1 | A |
|
|
|
|
|
Signal Ground (SGND) | 102 |
| 7 | B |
|
|
|
|
|
Send Data (SD) | 103 | A | 9 | P |
|
| B | 11 | S |
|
|
|
|
|
Receive Data (RD) | 104 | A | 12 | R |
|
| B | 13 | T |
|
|
|
|
|
Request to Send (RTS) | 105 |
| 4 | C |
|
|
|
|
|
Clear to Send (CTS) | 106 |
| 5 | D |
|
|
|
|
|
Data Set Ready (DSR) | 107 |
| 6 | E |
|
|
|
|
|
Data Terminal Ready (DTR) | 108 |
| 20 | H |
|
|
|
|
|
Received Line Signal Detector (RLSD), | 109 |
| 8 | F |
a.k.a. Carrier Detect (CD) |
|
|
|
|
|
|
|
|
|
Serial Clock Transmit External (SCTE), | 113 | A | 19 | U |
a.k.a. External Clock (EXTC) |
| B | 16 | W |
|
|
|
|
|
Serial Clock Transmit (SCT), | 114 | A | 14 | Y |
a.k.a. Transmit Clock (TC) |
| B | 10 | AA, a |
|
|
|
|
|
Serial Clock Receive (SCR), | 115 | A | 23 | V |
a.k.a. Receive Clock (RC) |
| B | 22 | X |
|
|
|
|
|
Remote Digital Loopback (RL) | 140 |
| 21 | HH, h* |
|
|
|
|
|
Local Analog Loopback (LL) | 141 |
| 18 | JJ, j* |
|
|
|
|
|
Test Mode (TM) | 142 |
| 25 | KK, k* |
|
|
|
|
|
*Black Box often assigns these signals to these M/34 pins, but your DTE might use different pins (if it supports these signals at all). Consult your DTE’s manual.
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