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DSX Port/Interface
Function
Receive tip from the DTE
Receive ring from the DTE
Transmit tip to the DTE
Transmit ring to the DTE
Shield
DTE Ports/Interfaces
Signal
Shield
Transmitted Data ( TXD )
Received Data ( RXD )
Request to Send ( RTS )
Clear to Send ( CTS )
Data Set (or DCE ) Ready
( DSR )
Signal Ground/Common ( SG )
Received Line Signal Detector
( RLSD or LSD )
Transmit Signal Element
Timing (TXC – DTE Source)
Transmitter Signal Element
Timing ( TXC – DCE Source)
Receiver Signal Element
Timing ( RXC – DCE Source )
Local Loopback ( LL )
Data Terminal (or DTE )
Ready ( DTR )
Remote Loopback ( RL )
Signal Common
Test Mode Indicator ( TM )
Circuit
T1
R1
T
R
–
Circuit
ITU/
Mnemonic
CCITT #
—
—
BA
103
BB
104
CA
105
CB
106
CC
107
AB
102A
CF
109
DA
113
DB
114
DD
115
LL
141
CD
108/1, /2
RL
140
AC
102B
TM
142
14
25-Pin
Direction
Pin #
—
1
To DCE
2 (A)
14 (B)
From DCE
3 (A)
16 (B)
To DCE
4 (A)
19 (B)
From DCE
5 (A)
13 (B)
From DCE
6
—
7
From DCE
8 (A)
10 (B)
To DCE
11 (B)
24 (A)
From DCE
12 (B)
15 (A)
From DCE
17 (A)
9 (B)
To DCE
18
To DCE
20
To DCE
21
—
22, 23
From DCE
25
Pin #
1
9
3
11
2,4
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