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MERLIN LEGEND Communications System Release 7.0
Pocket Reference
555-670-116
Issue 1
April 1999
33
Environmental Specifications
DS1 interface can be configured for connection of either T1 or PRI
for basic call control with the 4ESS or 5ESS PRI service
specifications.
Basic Rate interface (BRI) S/T protocol supports premier digital
multiline (MLX) telephones with superior display capabilities and
supports the ISDN terminal adapter Data Module for the connection
of adjuncts.
Environmental Specifications
The control unit requires a regulated environment and can be
located in any room or closet that is temperature-controlled and
clean. Do not mount the control unit where it will be exposed to direct
sunlight.
In addition, the control unit should not be co-located with air
conditioning or ventilation units, compressors, fans and blowers,
heaters, arc welders, or other machinery that produces electrical
interference.
The control unit is mounted on a Lucent Technologies pre-drilled
backboard.
Once installed, it is important to keep the control unit site clear of
hazards, such as stacked paper or boxes, that block ventilation.
Installing any machinery in the vicinity of the control unit should be
avoided. If any pollution-producing work (such as sanding or spray
painting) is to be done in the area, care should be taken to protect
the unit.
The following table gives the environmental specifications for the
control unit.
Control Unit
Fully loaded basic carrier
Weight: 45 lb. (20.4 kg)
Dimensions: 14 inches wide x 23 inches high x 12 inches
deep
(35.6 cm x 58.4 cm x 30.5 cm)
Fully loaded 2-carrier system
(basic carrier plus 1 expansion carrier)
Weight: 90 lb. (40.8 kg)
Dimensions: 25 inches wide x 23 inches high x 12 inches
deep
(63.5 cm x 58.4 cm x 30.5 cm)
Fully loaded 3-carrier system
(basic carrier plus 2 expansion carriers)
Weight: 135 lb. (61.2 kg)
Dimensions: 37 inches wide x 23 inches high x 12 inches
deep
(94 cm x 58.4 cm x 30.5 cm)
Mean Time between Failures
(mean/average time the system is expected to operate before any
type of failure occurs) = 2.4 years for a system configured with 24
trunks and 50 stations (extensions).