Table 1-4. Environmental Specifications; Environmental Requirements - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Introduction

Environmental Requirements

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
such machinery that produces electrical interference.
The control unit is mounted on a customer-provided plywood backboard. The
backboard should be wide enough to accommodate additional carriers if
system growth is anticipated. Allow enough space on either side of the control
unit for any necessary wiring fields.
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.
Table 1-4 gives the environmental specifications for the control unit.

Table 1-4. Environmental Specifications

Control Unit
Fully loaded basic carrier
Fully loaded 2-carrier system
(basic carrier plus one expansion carrier)
Fully loaded 3-carrier system
(basic carrier plus two expansion carriers)
Mean Time Between Failures
(mean or average time the system is expected to operate before any type
of failure occurs)
Mean Time Between Outages
(mean or average time the system is expected to operate before a failure
affecting more than 25% of extensions or lines for more than 15 seconds
occurs)
Backboard (minimum needed)
Without SYSTIMAX®
With SYSTIMAX
45lb (20.4kg) 14" W x 23" H x 12"D
(35.6 cm x 58.4 cm x 30.5 cm)
90 lb (40.8 kg) 25" W
(63.5 cm x 58.4 cm x 30.5 cm)
135lb (61.2 kg) 37" W x 23" H x 12"D
(94 cm x 58.4 cm x 30.5 cm)
2.1 years
4.0 years
6' W x 3' H x 3/4" D(182.9 cm x 91.4 cm x 1.9 cm)
7' W x 4' H x 3/4" D(213.4 cm x 121.9 cm x 1.9 cm)
Continued on next page
System Capacities and Requirements
23" H 12"D
x x
1-37