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D. Pin Assignments
Table D-8. RS-449 Cable Interface
D-10
Circuit
Signal
Mnemonic
Shield
—
Signal Ground
SG
Receive Ground
RC
Send Common
SC
Send Data
SD
Receive Data
RD
Request-to-Send
RS
Clear-to-Send
CS
Receiver Ready
RR
Data Mode
DM
Terminal Ready
TR
Terminal Timing
TT
Send Timing
ST
Receive Timing
RT
Local Loopback
LL
Remote Loopback
RL
Test Mode
TM
February 2001
ITU-T
Number
Direction
—
—
102A
—
102B
—
—
—
103
To DSU/CSU
104
From
DSU/CSU
105
To DSU/CSU
106
From
DSU/CSU
109
From
DSU/CSU
107
From
DSU/CSU
108/1, /2
To DSU/CSU
113
To DSU/CSU
114
From
DSU/CSU
115
From
DSU/CSU
141
To DSU/CSU
140
To DSU/CSU
142
From
DSU/CSU
Pin
1
19
20
37
4 (A)
22 (B)
6 (A)
24 (B)
7 (A)
25 (B)
9 (A)
27 (B)
13 (A)
31 (B)
11 (A)
29 (B)
12 (A)
30 (B)
17 (A)
35 (B)
5 (A)
23 (B)
8 (A)
26 (B)
10
14
18
3160-A2-GB21-90
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