IBM X.25 - Manual (Page 28)

X.21 bis (V.35) Connector Information
The X.21 bis (V.35) pin assignments for the 37-pin connector on the
PCI co-processor adapter and the corresponding pin assignments for
the 34-pin connector on the optional adapter cable are listed in
Table 3-3. (The pin positions on the connector are shown under
“Pin Numbers” on page 3-1.)
Table 3-3. X.21 bis (V.35) Interface Pin
Assignments
Signal
Name 37-Pin
Connector 34-Pin
Connector
RTS 4 C
CTS 5 D
DSR 6 E
GND 7 B
CD 8 F
RX CLK (B) 16 X
TXD (B) 17 S
TX CLK IN (B) 18 AA
RXD (B) 19 T
DTR 20 H
RI 22 J
RX CLK (A) 34 V
TXD (A) 35 P
TX CLK IN (A) 36 Y
RXD (A) 37 R
3-4 X.25 Co-Processor PCI GTO