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Installation
3-473000-A2-GA31-80 December 1994
Circuit Card Installation
The COMSPHERE 3000 Series Carrier is now
properly installed and ready to accept modular and/or
non-modular T1 CSUs, T1 DSU/CSUs, DSUs, TDMs,
MCMPs, DBM-Vs, DBM-Ss, DBM-Ds, and modems.
Non-modular circuit cards are circuit cards with
on-board connectors (Figure 3-34). When non-modular
circuit cards are installed in the carrier, you must
disconnect the DTE cables before removing the circuit
cards from the carrier. However, a modular DSU or
dial/lease modem circuit card, a circuit card with ‘‘gold
finger” contacts on the rear edge of the card, can be
removed from the carrier without disturbing the DTE
cables at the rear of the carrier (Figure 3-34). Rear
connector plates that screw onto the rear of the
COMSPHERE 3000 Series Carrier are supplied with the
modular DSUs and dial/lease modems and provide the
DTE interfaces. Rear connector plates can also be ordered
separately.
The rear connector plate contains two 25-pin DTE
connectors, a 25-pin EIA-232-D/V.24 connector and a
25-pin CCITT V.35 connector, which is shipped with a
modular DSU V.35 interconnect cable (feature number
3000-F1-510). This version is supplied with the dial/lease
modem, as well. If you intend to use the V.35 interface,
you must use the cable provided to convert the 25-pin
V.35 interface to the standard 34-pin V.35 interface.
Modular DSUs and TDM or MCMP circuit cards,
hereafter referred to as modular DSU-TDM or
DSU-MCMP circuit cards, can also be removed from the
carrier without disconnecting the DTE cables from the
rear of the carrier (Figure 3-35). Connector modules that
screw onto the rear of the COMSPHERE 3000 Series
Carrier are supplied with the modular DSU-TDM or
DSU-MCMP, and provide the DTE interfaces
(Figure 3-35).
Figure 3-34. Modular DSU or Dial/Lease Modem, and Rear Connector Plate