Procedure 15.26: CONFIRM CTTU SPECIAL CABLE REQUIREMENT
OVERVIEW
The dial-up data link used for the centralized trunk testing unit (CTTU) interface uses a 1200-baud auto answer
212-L1A/2A data set which is terminated at the Lucent Technologies 3B20D/21D Computer in IOP 0, community 2,
PC slot 23, channel 0. Since the 3B20D/21D Computer does not support an RS-232C interface for dial-up data links
that use the TN75C, a special cable is required between the 212 data set and the TN75C.
PROCEDURE
1.
Refer to Figure 15.26-1 to verify the special cable requirement between the 212 data set and the TN75C.
2.
STOP. YOU HAVE COMPLETED THIS PROCEDURE.
Figure 15.26-1 Cable for CTTU Data Link Interface
235-105-210
October 1999
Copyright © 1999
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