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3-20 Installation and Replacement
Cabling the Vanguard 342
DB25 X.21/V.11 Pinouts
Connector Pinout This table shows the DB25 X.21/V.11 connector pinouts for DCE/DTE mode. To use
DTE to DTE or DCE to DCE mode, a crossover adapter cable is required. Refer to
Figure 3-5 on page 3-21 for crossover cable connections:
Note
To use DTE mode, the Interface Options parameter must be set to XOVER. For
details on setting the X.21/V.11 Interface Options, see “Setting the Interface
Options” section on page 3-10.
Port 3
Pin
DCE Signal Function/Signal
Name
Port 3
Pin
DTE Signal
using
Crossover
Adapter Cable
Function/Signal
Name
1 ------------- PROTECTIVE
GROUND
1 ------------- PROTECTIVE
GROUND
2 <------------ TRANSMITTED
DATA-A
2 ------------> TRANSMITTED
DATA-A
3 ------------> RECEIVED DATA-A 3 <------------ RECEIVED DATA-A
4 <------------ CONTROL-A 4 ------------> CONTROL-A
5 ------------- (no connection) 5 ------------- (no connection)
6 ------------> INDICATION-B 6 <------------ INDICATION-B
7 ------------- SIGNAL GROUND 7 ------------- SIGNAL GROUND
8 ------------> INDICATION-A 8 <------------ INDICATION-A
14 <------------ TRANSMITTED
DATA-B
14 ------------> TRANSMITTED
DATA-B
15 ------------> SIGNAL ELEMENT
TIMING-A
15 ------------- (no connection)
16 ------------> RECEIVED DATA-B 16 <------------ RECEIVED DATA-B
17 (no signal) RECEIVE CLOCK-A 17 (no signal) RECEIVE CLOCK-A
18 (no signal) RECEIVE CLOCK-B 18 (no signal) RECEIVE CLOCK-B
20 <------------ CONTROL-B 20 ------------> CONTROL-B
21 ------------> SIGNAL ELEMENT
TIMING-B
21 ------------- (no connection)
22 <------------ EXTERNAL
TRANSMIT
CLOCK B
22 ------------> EXTERNAL
TRANSMIT
CLOCK B
24 <------------ EXTERNAL
TRANSMIT
CLOCK A
24 ------------> EXTERNAL
TRANSMIT
CLOCK A
25 -------------- (no connection) 25 ------------- (no connection)