Enterasys SBUQHS/QHB, User Manual

Page: 82 / 96

Quad User Modules
User Manual
80-14001000-03 9–2
9.2 V.35 Operation
V.35 is a balanced form of signalling for the data and clock circuits which
requires two circuits for each circuit. Control circuits only have one
circuit each at V.28 level.
Both User and Link (for backup modules) connectors are all 34 way
female MRAC.
The pin assignments are as follows:
Pin No. Circuit No. Signal Name
A 101 Signal Ground / Chassis Earth
B 102 Signal Ground / Chassis Earth
P 103A Transmit Data A
S 103B Transmit Data B
R 104A Receive Data A
T 104B Receive Data B
Y 114A Transmit Clock A
AA 114B Transmit Clock B
V 115A Receive Clock A
X 115B Receive Clock B
C 105 Request To Send
D 106 Clear To Send
E 107 Data Set Ready
H 108 Data Terminal Ready
F 109 Data Carrier Detect
J 125 Ring Indicate*
L 141 Select Local Loopback*
N 140 Select Remote Loopback*
NN 142 Test Indicator*
*These circuits are not presented on the Link ports of the Backup
modules.