Line Drawer Shelf - Nortel DMS-100 Series Maintenance Manual

2-20 Star Remote System hardware
install an optical isolator between the FSP connector and the terminal
connector.
Talk battery and circuit breaker card (NTTR76AA)
The NTTR76AA talk battery and circuit breaker card
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Line drawer shelf

The Star Hub contains three line drawer shelves. Each shelf contains up to six
line drawers. A fully equipped Star Hub contains 18 line drawers, of which
two drawers on each shelf can be an ILD-R.
Baffle panels above each line drawer shelf permit air circulation for
convectional cooling.
The following sections describe the line drawers in the Star Hub shelves. The
following figure shows the arrangement of the line drawers and the line drawer
and line subgroup numbering arrangement.
297-8353-550 Standard 05.01 March 2001
contains the circuit breakers that connect to the power sources (-48 V
A-feed and -48 V B-feed) to the loads (converter and ringer cards)
provides talk battery filters to reduce audio frequency cross talk
protects the whole FSP against voltage transients on the main -48 V feed
that can result from lightning or reversed polarity connections
connects to the alarms card and the maintenance and fuses card