Mitel SX-200 Documentation page 447

SECTION 91 OS/91 1 O-096-180-NA
shelf located at the bottom of the cabinet. Connections between [
shelves and external equipment are made by connectorized cables
from the rear of each shelf. The system primary power supply, held on
the lower hinged back panel of the cabinet, converts the commercial
input power to the required system voltage levels.
Maintenance Panel
3.17 The plug on the right of the maintenance panel permits the
maintenance console to be used by the service personnel to
perform maintenance tasks and enter new, or modify existing cus-
tomer data using the maintenance console. The test line terminals on
the panel allow the use of a standard hand test-set (butt-in) to estab-
lish calls through the system using preselected circuits. The power
switch on the maintenance panel controls the application of power to
the equipment shelves.
Equipment Shelves
3.18 Equipment shelf 1 holds up to 20 printed circuit cards which
plug into the shelf backplane. On the rear of the backplane are a
number of multipin type plugs providing interconnections between the
shelves and external equipment. In addition to the plugs are a number
of screw-down terminals, allowing shelf connection to the primary
power supply unit. The equipment shelves (see Figure 3-4) measure
273 mm (10.75 in.) high, 480 mm (19 in.) wide, 415 mm (16.375 in.) deep
and weigh approximately 12.3 kg (27 lb) fully equipped. Equipment
shelf 2 is identical in construction to equipment shelf 1 and holds up
to 12 additional line or trunk cards.
Primary Power Supply
3.19 The system primary power supply (see Figure 3-5) mounted
directly on the cabinet back panel (total weight 31.8 kg (70 lb))
provides all system power from either a 115 Vat, or a 230 Vat, 44 Hz -
64 Hz commercial supply.
Reserve Power Supply
3.20 The reserve power supply is designed to maintain completed
system operation for a minimum of 2 hours in the event of a
primary power failure. The batteries are housed in a completely en-
closed shelf measuring 178 mm (7 in.) high, 483 mm (19 in.) wide, 381
mm (15 in.) deep and weighing approximately 43 kg (95 lb). The charg-
ing unit measures 178 mm (7 in.) high, 127 mm (5 in.) wide, 355 mm
(14 in.) deep, weighs 6.4 kg (14 lb) and mounts inside the SX-200
cabinet (see Figure 4-l).