Ciena CN 3960, Руководство по установке оборудования, Страница: 14 / 72

10
CN 3960 Hardware Installation Guide
O
VERVIEW
H
ARDWARE
O
VERVIEW
Environmental Control
The CN 3960 is designed for interior, non-hardened installations and supports the
following environmental range:
•
0C to +50C operating ambient temperature up to an altitude of 3000 m
•
-40C to +70C storage temperature
•
5% to 95% non-condensing humidity
NOTE: For installations between 3000 and 4000 m the maximum operating ambient
temperature is +40C.
Extreme Temperature Conditions
In accordance with NEBS level 3 specifications, the CN 3960 is capable of operating for
short periods of time (not more than 96 consecutive hours and a total of not more than
15 days in 1 year) at -5 C to +55C.
The CN 3960 has internal temperature sensors that monitor the temperature within the
unit. The software supports alarms, traps and logs at user configurable temperature
thresholds.
When temperatures exceed the maximum operating temperature, an automatic over
temperature shutdown is initiated to protect the CN 3960 from damage. When the
temperature returns to the supported operating temperature range, the unit will
automatically restart and resume service.
Fans and Airflow
The CN 3960 has three fans to provide adequate air flow. The fans draw air from the front
of the unit and exhaust out the rear. The 7.62 cm (3 inch) installation clearance at the
front and back of the unit assists with air flow by ensuring that the vents of the unit are
not blocked.
When only one power supply is installed in the CN 3960, the second power supply bay
must be covered with a filler plate. The filler plate is necessary to ensure proper airflow
within the CN 3960. The unit is initially supplied with a filler plate. If it is misplaced, a
replacement can be ordered from Ciena.
In addition, the AC and DC power supplies have built-in fans to ensure adequate cooling
of the power supply. To maintain adequate cooling, the power supply and system fans
need to be kept clear of obstructions.
Fan Failure
If a fan failure occurs, an alarm is raised and an SNMP trap is sent. When a fan fails in the
CN 3960, then all three fans in the unit should be replaced. Replacing the fans is a service
impacting repair since the unit must be taken completely offline and returned to Ciena
for repair.
All manuals and user guides at all-guides.com