Service Manual

GSM-205-323
Circuit breaker module (CBM)
31st Oct 01
Tech. 4–10
Technical Description: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W07-B
Circuit breaker module (CBM)
CBM overview
The CBM provides circuit protection and manual isolation for all parts of the
cabinet, except the PSMs. The CBM is located above the digital module shelf
and below the PSMs. The honeycomb casing permits cabinet ventilation
through the module.
The CBM is connected to the backplane, providing isolator switches and
overload protection for the equipment indicated in Figure 4-5.
View of CBM
Figure 4-5 shows views of the CBM with circuit breaker buttons identified.
ig.281.rh
6 CTUs (0 TO 5)
FRONT VIEW
12 A2 A4 A 7 A
BACKPLANE CONNECTOR
M4 MODULE ATTACHMENT
SCREWS
CCB (0 AND 1) SURF FANS BPSMs (A AND B)
7 A
HANDLE-BAFFLE
Figure 4-5 Views of CBM with circuit breaker buttons identified