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256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)
Table 4-3. Pinout of the RackNest 2/14’s DB25 connector
when ME445C-35 is installed.
SIGNAL ITU-TSS 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
B11 S
Receive Data (RD) 104 A 12 R
B13 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.