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Pin Assignments
D-10
3160-A2-GB21-80March 1999
Table D-8. RS-449 Cable Interface
Signal
Circuit
Mnemonic
ITU-T
Number
Direction Pin
Shield — — — 1
Signal Ground SG 102A — 19
Receive Ground RC 102B — 20
Send Common SC — — 37
Send Data SD 103 To DSU/CSU 4 (A)
22 (B)
Receive Data RD 104 From
DSU/CSU
6 (A)
24 (B)
Request-to-Send RS 105 To DSU/CSU 7 (A)
25 (B)
Clear-to-Send CS 106 From
DSU/CSU
9 (A)
27 (B)
Receiver Ready RR 109 From
DSU/CSU
13 (A)
31 (B)
Data Mode DM 107 From
DSU/CSU
11 (A)
29 (B)
Terminal Ready TR 108/1, /2 To DSU/CSU 12 (A)
30 (B)
Terminal Timing TT 113 To DSU/CSU 17 (A)
35 (B)
Send Timing ST 114 From
DSU/CSU
5 (A)
23 (B)
Receive Timing RT 115 From
DSU/CSU
8 (A)
26 (B)
Local Loopback LL 141 To DSU/CSU 10
Remote Loopback RL 140 To DSU/CSU 14
Test Mode TM 142 From
DSU/CSU
18