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COMSPHERE 3000 Series Carrier
2-4 December 1994 3000-A2-GA31-80
If modular devices are installed in the same carrier as
non-modular devices, the modular devices must be
installed to the left of all other devices, as viewed from
the front of the carrier.
If your carriers are equipped with DSUs with DBMs,
dial/lease modems, or modems having dial backup
capability, the half of the carrier containing those devices
must have a Network Interface Module (NIM) installed to
provide a dial network or switched 56 kbps digital service
interface. Since one module serves eight slots, it is best to
group units with dial capability.
NIMs can be installed at the rear of the carrier. There is
a total of nine different NIMs available.
The carrier’s backplane contains connectors which
automatically engage mating connectors on DSUs (and
TDM or MCMP circuit cards, if installed) or dial/lease
modems when they are installed. To prevent accidental
contact with these connectors, use filler panels for unfilled
slots. Verify that you have ordered a sufficient quantity.
To use 3151 CSUs or 3161 DSU/CSUs in the carrier,
you must remove any rear connector plates or modules
and add the 3151/3161 Auxiliary Backplane. Using a
single Auxiliary Backplane, you can install any
combination of up to eight 3151 CSUs and 3161
DSU/CSUs on one side of the 3000 Series Carrier, and up
to eight 3600, 3800, and 3900 Series devices on the other
side of the carrier. Alternatively, using two Auxiliary
Backplanes, you can install up to sixteen 3151 CSUs or
3161 DSU/CSUs in a single 3000 Series Carrier.
For each non-modular TDM or MCMP circuit card
installed in the carrier, determine whether the circuit card
is to be used as a Time Division Multiplexer (TDM) or as
a digital bridge. A TDM interface cable is supplied with
each non-modular TDM or MCMP circuit card. However,
a digital bridge interface cable must be ordered separately.
For modular TDM or MCMP circuit cards, use
standard cables for Ports 1 through 6. However, a 6-port
V.35 interconnect cable is required for the 26-pin
high-density D-type connector on the connector module.
This cable must be ordered separately.
It is recommended that you do not perform any
procedure that removes power to the carrier (for example,
replacing the power transformer unit or disconnecting
power to the power transformer to install an SDCP in a
fully configured carrier) during peak operating hours since
disconnecting power disables all units in the carrier.