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Table B-1
ITU-T V.35 DTE Interface Signals
V.34
Designation
DB25
Pin
ITU-T
7
B
102
4
C
105
5
D
106
6
E
107
8
F
109
25
NN
142
2
P
103
3
S
103
3
R
104
14
T
104
24
U
113
11
W
113
17
V
115
9
X
115
15
Y
114
12
AA/a
20
H
108/2
18
L
141
21
N
140
076R155-000
Issue 7
Appendix B:
Circuit
EIA
AB
Establishes a common ground reference for all interface circuits
except protective ground, pin A.
CA
Indicates to Data Set that DTE is prepared to transmit.
CB
Indicates to DTE that Data Set is prepared to transmit.
CC
Indicates to DTE that Data Set is operational.
CF
Indicates to DTE that Data Set is receiving data (not idle or OOS
codes).
TM
Indicates to DTE that Data Set is in a test mode.
BA(A)
Transfers data signals from DTE for transmission over communication
BA(B)
line.
BB(A)
Transfers data signals received over communication line by Data Set
BB(B)
to DTE.
DA(A)
Transfers transmitter signal timing information from DTE to Data Set.
DA(B)
DD(A)
Transfers receiver signal timing information from Data Set to DTE.
DD(B)
DB(A)
Transfers transmitter signal timing information from Data Set to DTE.
DB(B)
CO
Indicates to Data Set that DTE is prepared for data communication.
LL
Controls Local Loopback test
RL
Controls Remote Loop test
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Interface Signals
Description
B-1
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