Standard Eia-232-D Crossover Cable; Configuring An External Modem - Paradyne 7123 User Manual

C. Connectors, Cables, and Pin Assignments

Standard EIA-232-D Crossover Cable

A standard crossover cable can be used to connect the COM port to an
external modem. The external modem must be configured so it is compatible with
the DSU/CSU. See the procedure in
to configure an external modem.
C-4
Pin 14
P1
Plug
Pin 1
Pin 13
Pin 25
P1 Pin
Chassis Ground 1
TXD 2
RXD 3
RTS 4
5
DSR 6
Signal Ground 7
CD (RLSD) 8
9
10
11
12
13
14
15
16
RXC 17
18
19
DTR 20
21
22
23
XTXC 24
25
September 2001

Configuring an External Modem

P2
Plug
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
on page C-5
Pin 1
Pin 14
Pin 25
Pin 13
P2
Chassis Ground
TXD
RXD
RTS
DSR
Signal Ground
CD (RLSD)
RXC
DTR
XTXC
496-15180
7123-A2-GB20-00