363-206-305
Shelf Descriptions and Configurations
Issue 3 June 2000
3-31
DDM-2000 FiberReach Narrowband
Shelf
3
The DDM-2000 FiberReach Narrowband Shelf (NBS) is similar to the DDM-2000
FiberReach Wideband Shelf (WBS). Both are approximately 9.5 inches high by 8
inches wide. Either shelf may be mounted in the DDM-2000 FiberReach Multiplex
Carrier Assembly, the Wall DT Assembly, and the 61B cabinet. The carrier
assembly provides space for up to two wideband shelves, two narrowband
shelves, or one wideband shelf and one narrowband shelf plus up to two DS1 jack
panel assemblies and one LGX panel assembly. The 61B cabinet provides space
for up to two wideband shelves, two narrowband shelves, or one wideband shelf
and one narrowband shelf.
The operation of the narrowband shelf requires DLC Release 4.4 in the
SLC
®
-2000 Host Digital Terminal (HDT) and Release 3.0 or later in the DDM-2000
FiberReach Wideband shelf.
There can be up to sixteen circuit packs installed in the NBS. The four common
units are always required and they are:
There are twelve channel unit positions that can be used for up to 24 voice
frequency (VF) lines with Release 4.3 and for up to 48 VF lines with Release 4.4.
Refer to Table 3-2 for the channel units that are supported by FiberReach Release
3.0 and later (SLC-2000, Release 4.3 and 4.4).
The SLC-2000 HDT has a SPQ809 MSDT Server in the metallic distribution shelf
(MDS) that sends a DSX-1 signal to the collocated WBS. The WBS multiplexes
the DSX-1 electrical signals into an OC-1 optical signal and transmits it to the
optical network unit (ONU). Another WBS in the ONU demultiplexes the OC-1
optical signal back into the DSX-1 electrical signals and sends them to the
DSXBIU in the NBS. In SLC-2000 Release 4.3 the DSXBIU conditions the signals
so that one DSX-1 signal is sent to the first six channel unit slots. A second server
is required in the HDT to provide the second DSX-1 signal for VF circuits 13
through 24.
DLC Release 4.4 introduces the octet mode which allows up to four DSX-1 signals
to be sent to the ONU which the DSXBIU will condition and send to four sets of
three channel unit slots. Each set may be used for up to 24 VF circuits or 10 ISDN
FHB2 DSXBIU Provides the electrical connection to the Wideband Shelf
AUA413 RGU Provides ringing voltage
AUA421 CDTU Provides channel drop test capability
AUA432 PCU Provides DC voltages from 48 volt battery voltage
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