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V.35/X.21 (EIA-530-A) Port
The V.35/X.21 port is on the faceplate of the 4804 Management Module. It
provides the EIA-530-A interface shown in
Interface
Table A-4. V.35/X.21 (EIA-530-A) Port Interface Connector
4821-A2-GN20-00
Connector.
Signal
Shield
Signal Common
Signal Common
Transmitted Data
Received Data
Request to Send
Clear to Send
Received Line Signal Detector
DCE Ready
DTE Ready
Transmit Signal Element
Timing (DTE Source)
Transmit Signal Element
Timing (DCE Source)
Receiver Signal Element
Timing (DCE Source)
Local Loopback
Remote Loopback
Test Mode
April 2002
A. Connectors, Cables, and Pin Assignments
Table A-4, V.35/X.21 (EIA-530-A) Port
Circuit
ITU-T
Mnemonic
Number
Direction
—
—
—
AB
102A
—
AC
102B
—
BA
103
To DSU/CSU
BB
104
From DSU/CSU
CA
105
To DSU/CSU
CB
106
From DSU/CSU
CF
109
From DSU/CSU
CC
107
From DSU/CSU
CD
108/1, /2
To DSU/CSU
DA
113
To DSU/CSU
DB
114
From DSU/CSU
DD
115
From DSU/CSU
LL
141
To DSU/CSU
RL
140
To DSU/CSU
TM
142
From DSU/CSU
Pin
1
7
23
2 (A)
14 (B)
3 (A)
16 (B)
4 (A)
19 (B)
5 (A)
13 (B)
8 (A)
10 (B)
6
20
11 (B)
24 (A)
12 (B)
15 (A)
17 (A)
9 (B)
18
21
25
A-5
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