HP ProCurve 7000dl Series Basic Management And Configuration Manual page 281

If you are not sure which type of cable you have, this chapter provides
illustrations of the three cable connectors. For example, Figure 5-4 shows the
pinouts for ProCurve Networking's implementation of the V.35 cable connec-
tor and lists how each pin is used.
M/34 ("34-pin M-block") connector pinout
Pin Signal/Circuit Name
A Unused
B Signal Ground
C RTS_A, Request to Send A
D CTS_A, Clear to Send A
E DSR_A, Data Set Ready A
F DCD_A, Data Carrier Detect A
H DTR_A, Data Terminal Ready A
J Unused
K TM_A, Test Mode A
L Unused
N Unused
N Unused
P TD_A, Send Data A
R RD_A, Receive Data A
S TD_B, Send Data B
T RD_B, Receive Data B
U ETC_A, Terminal Timing A
V RCLK_A, Receive Timing A
W ETC_B, Terminal Timing B
X RCLK_B, Receive Timing B
Y TCLK_A, Send Timing A
AA TCLK_B, Send Timing B
M, Z, BB through FF, and MM are reserved for future
international standardization, HH through LL are reserved for
country-specific standards
Figure 5-4. ProCurve Networking's V.35 Cable Connector
Configuring Serial Interfaces for E1- and T1-Carrier Lines
Serial Interface: Configuring the Physical Layer
V.35
5-9