Mitel SX-200 Documentation page 406

panel, mounted at the top of the cabinet, provides access to the
system from the maintenance console through a 50-pin connector. To
the left of the maintenance connector is a master power fail transfer
switch and five power fail transfer control switches. A system power
switch, with indicator, is provided on the panel. In addition, a test line
is provided which allows service personnel to access individual lines
and trunks. Mounted in the middle of the equipment cabinet is equip-
ment shelf 1. This shelf holds all system control logic plus a number of
trunk, line and receiver cards. Above equipment shelf 1 is equipment
shelf 2, which contains additional trunk and line cards. The optional
reserve power supply is contained in a completely enclosed shelf
located below shelf 1. All connections between shelves and external
equipment are made by plug-ended cables from the rear of each shelf.
The system primary power supply, held on the hinged back panel of
the cabinet, converts the commercial input power to the required
system voltage levels.
Maintenance Panel
2.09 The SX-100 maintenance panel (Figure 2-4) measures 88.9 mm
(3.50 in.) high, 584.2 mm (23 in.) wide, and 50.8 mm (2 in.) deep,
with a total weight of .682 kg (1.5 lb). The SX-200 maintenance panel
(Figure 2-5) measures 51 mm (2 in.) high, 460 mm (19 in.) wide and 51
mm (2 in.) deep, with a total weight of 0.9 kg (2.1 lb). The operation of
both panels is identical. The maintenance connector on-the right of the
panel permits service personnel to perform maintenance tasks and
enter new, or modify existing customer data using the maintenance
console. The test line terminals on the panel allow the use of a
standard hand test set (butt-in) to establish calls through the system
using preselected circuits. The power switch controls the application
of power to the equipment shelves.
Equipment Shelf
2.10 The equipment shelf (Figure 2-6) holds up to 22 printed circuit
cards which plug into the shelf backplane. On the rear of the
backplane are a number of connectors providing interconnections be-
tween the shelf and external equipment In addition to these connec-
tors are a number of screw-down terminals allowing shelf connection
to the primary power supply unit. The equipment shelf measures 273
mm (10.75 in.) high, 480 mm (19 in.) wide, 415 mm (16.375 in.) deep
and weighs approximately 12.2 kg (27 lb) fully equipped.
Printed Circuit
Cards
2.11
All circuit cards (see Figure 2-7) within the SX-100 system or
the SX-200 system are identical in construction and consist of
a fiberglass board with printed wiring patterns on both of its faces.
allows the LEDs mounted on the front of the boards to be easily seen.
The two color-coded card extractors, located at the top and bottom of
the faceplate, identify the card position (see Table 2-l) within a shelf
and ensure that the card is seated correctly in the backplane connec-
1 O-096-150-NA
SECTION MITL91 OS/91
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