PRACTICE
553-2201183
Page 4-2
.
l generate diagnostics ‘an “ERROR
500”
message when the Message
Waiting lamp is defective or the telephone is unplugged provided
-150 V is present. If -150 V is missing (blown fuse) no message is
generated under any condition.
4.05 QPC681 and QPC682 Parallel Message Waiting Line packs:
l provides the same features as the
QPC494‘
and
QPCS58
Message
Waiting Line packs
l provides a -48 V connection to a lamp bank.
4.06 QPC532 Ground Button Recall Line pack:
l provides detection of ground on tip or ring with
40
ms validation
time
l strap-selectable A-Law or
~-Law
coding
l strap-selectable 0, 1, 2 or 4
dB
pad in each transmission path
l
impedance-matching to 3-component complex impedances
l
trans hybrid balance against 3-component complex impedances.
4.07
RPC584
and QPC729
16-Port
Basic 50012500 Line Packs:
l sixteen individual line circuits per pack.
4.08
QPC789
16-Port
Message Waiting 50012500 Line Pack:
l
sixteen message waiting individual line circuits per pack.
-
,:
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r
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.:
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