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Connection Procedure
Issue 1 CRCS R6.0 April 1999 11
Figure 6. Remote CRCS Connection to MCU (Modem Pooling)
5. Connect the female end of the RS232 cable to the male end of either an
adapter or the CRCS PC first serial port.
6. Connect the male end of the RS232 cable to the female 25-pin RS232 con-
nector on the analog modem (remote connection) or data module (local
connection).
Figure 7. Connecting the MCU to the CRCS PC
7. If you are using the 8400B data module (TN2224 required), go to step 8. If
you are using the 7400B data module, verify or change the following dip
switch settings:
For a standalone data-only 7400B data module, set dip switch #1 to
ON (UP), if no phone is connected. All other dip switches should be
set to the OFF position (DOWN);
If you are using a phone on a 7400B data module, set all dip
switches to the OFF position (DOWN).
8. Continue with "Checking the Modem Settings" on page 12.
Public/Private
Network
Modem
PC
7400A
7400A
3800
3800
RS232Analog
DCP
DCP
DS1
TN754B
TN746B
Analog
Analog
RS232
Voice Grade
Data Call
TDM Bus
MCU
Cross-Connect
at MDF
103A
or Wall
Jack
7400B/8400B
PC
TN754B/
TN2224
B25A
D8W M25B
5000 Feet