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Cables, Connectors, and Pin Assignments
E-10
9161-A2-GH30-30April 1998
The following table provides the pin assignments for the 25-position Sync Data
connector/interface and a DTE’s 37-position RS449 connector.
Signal
ITU/
CCITT #
25-Pin
Plug
Pin #
Direction
37-Pin
Socket
Pin #
Shield — 1 — 1
Transmit Data (TXD/TD) 103 2 (A),
14 (B)
To DCE 4 (A),
22 (B)
Receive Data (RXD/RD) 104 3 (A),
16 (B)
From DCE 6 (A),
24 (B)
Request to Send (RTS) 105 4 (A),
19 (B)
To DCE 7 (A),
25 (B)
Clear to Send (CTS) 106 5 (A),
13 (B)
From DCE 9 (A),
27 (B)
Data Set Ready/Data Mode
(DSR/DM)
107 6 From DCE 11 (A)
Signal Ground (SG) 102A 7 — 19
Data Channel Received Line
Signal Detect/Receiver Ready
(RLSD/RR)
109 8 (A),
10 (B)
From DCE 13 (A),
31 (B)
Transmitter Signal Element
Timing/Transmit Timing (TXC) —
DCE Source
114 15 (A),
12 (B)
From DCE 5 (A),
23 (B)
Receiver Signal Element Timing/
Receive Timing (RXC) —
DCE Source
115 17 (A),
9 (B)
From DCE 8 (A),
26 (B)
Local Loopback (LL) 141 18 To DCE 10
Data Terminal (or DTE) Ready
(DTR/TR)
108/1, /2 20 To DCE 12 (A)
Remote Loopback (RL) 140 21 To DCE 14
Receive Common (RC) 102B 23 — 20, 29
Transmitter Signal Element/
Terminal Timing (TT) —
DTE Source
113 24 (A),
11 (B )
To DCE 17 (A),
35 (B)
Test Mode (TM) 142 25 From DCE 18
no connection — — — 30, 37