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Connectors, Cables, and Pin Assignments
C-12
9664-A2-GB20-00March 2000
The following table provides the pin assignments for the DB25-to-DB25
straight-through cable.
Signal
ITU/
CCITT #
25-Pin
Plug
Pin #
Direction
25-Pin
Socket
Pin #
Shield — 1 — 1
Transmit Data (TXD) 103 2 (A)
14 (B)
To DCE 2 (A)
14 (B)
Received Data (RXD) 104 3 (A)
16 (B)
From DCE 3 (A)
16 (B)
Request to Send (RTS) 105 4, 19 To DCE 4, 19
Clear to Send (CTS) 106 5, 13 From DCE 5, 13
Data Set (or DCE) Ready (DSR) 107 6 From DCE 6
Data Terminal (or DTE) Ready
(DTR)
108/1, /2 20 To DCE 20
Signal Ground/Common (SG) 102 7 — 7
Data Channel Received Line
Signal Detector (RLSD or LSD)
109 8, 10 From DCE 8, 10
Transmit Signal Element Timing
(TXC) — DCE Source
114 15 (A)
12 (B)
From DCE 15 (A)
12 (B)
Received Signal Element Timing
(RXC) — DCE Source
115 17 (A)
9 (B)
From DCE 17 (A)
9 (B)
Local Loopback (LL) 141 18 To DCE 18
Loopback/Maintenance (RL) 140 21 To DCE 21
Transmit Signal Element/
Terminal Timing (TT) —
DTE Source
113 24 (A)
11 (B)
To DCE 24 (A)
11 (B)
Test Mode Indicator (TM) 142 25 From DCE 25