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EIA-232 User Data Port Connector
The following table provides the pin assignments for the 25-position
EIA-232 connector to the user data terminal equipment.
7520-A2-GB20-20
Signal
Transmitted Data ( TXD )
Received Data ( RXD )
Request to Send ( RTS )
Clear to Send ( CTS )
Data Set Ready ( DSR )
Signal Ground/Common
Received Line Signal Detector/Carrier
Detect ( RLSD/CD )
Transmitter Signal Element Timing –
DCE Source ( TXC )
Receiver Signal Element Timing –
DCE Source ( RXC )
Local Loopback ( LL )
Data Terminal Ready ( DTR )
Remote Loopback ( RL )
Transmitter Signal Element Timing –
DTE Source ( XTXC or TT )
Test Mode Indicator ( TM )
May 1998
Cables and Pin Assignments
ITU
Direction
CT #
103
To DSU (In)
104
From DSU (Out)
105
To DSU (In)
106
From DSU (Out)
107
From DSU (Out)
102
—
109
From DSU (Out)
114
From DSU (Out)
115
From DSU (Out)
141
To DSU (In)
108/1, /2 To DSU (In)
140
To DSU (In)
113
To DSU (In)
142
From DSU (Out)
25-Pin
Socket
Connector
2
3
4
5
6
7
8
15
17
18
20
21
24
25
C-3
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Troubleshooting
