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Connecting the Control Unit to the Network Interface
551 T1 CSU
The 551 T1 CSU performs many of the same functions as the ESF T1 CSU
except for the following:
■ B8ZS is not supported.
Therefore, the 64-kbps clear channel is not supported.
■ Extended superframe (ESF) format is not supported.
if a network requires this format, the ESF T1 CSU must be used.
This CSU consists of the following components:
■ chassis with top and rear cover
■ Signal Monitor Unit (plug-in)
■ Office Repeater (plug-in)
■ Fault Location Filter (a factory-installed option)
FAULT LOCATION FILTER
AT&T
551 T1 Channel Service Unit
OFFICE REPEATER
SIGNAL MONITOR UNIT
Figure 4-8. 551 T1 CSU
Installing the Channel Service Unit
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