Fan Failure - Cisco ONS 15454 DWDM Installation And Operation Manual

Chapter 15 Shelf Hardware Reference

15.12.2 Fan Failure

If one or more fans fail on the fan-tray assembly, replace the entire assembly. You cannot replace
individual fans. The red Fan Fail LED on the front of the fan tray illuminates when one or more fans fail.
For fan-tray replacement instructions, see the
on page
15.12.3 Air Filter
The ONS 15454 contains a reusable air filter (for ANSI: 15454-FTF2; for ETSI: 15454E-ETSI-FTF) that
is installed either below the fan-tray assembly or, for the ONS 15454 ANSI, in the optional external filter
brackets.
The reusable filter is made of a gray, open-cell, polyurethane foam that is specially coated to provide fire
and fungi resistance. All versions of the ONS 15454 can use the reusable air filter. Spare filters should
be kept in stock. Inspect the air filter every 30 days, and clean the filter every three to six months.
Replace the air filter every two to three years. Avoid cleaning the air filter with harsh cleaning agents or
solvents.
Earlier versions of the ONS 15454 ANSI shelf used a disposable air filter that is installed beneath the
fan-tray assembly only. However, the reusable air filter is backward compatible.
15.13 Power and Ground Description
Ground the equipment according to Telcordia standards or local practices. The following sections
describe power and ground for the ONS 15454 shelves.
15.13.1 ONS 15454 ANSI Power and Ground
Cisco recommends the following wiring conventions, but customer conventions prevail:
•
•
•
The ONS 15454 ANSI has redundant –48 VDC #8 power terminals on the shelf-assembly backplane.
The terminals are labeled BAT1, RET1, BAT2, and RET2 and are located on the lower section of the
backplane behind a clear plastic cover.
To install redundant power feeds, use four power cables and one ground cable. For a single power feed,
only two power cables (#10 AWG, 2.588 mm² [0.1018 inch], copper conductor, 194°F [90°C]) and one
ground cable (#6 AWG, 4.115 mm² [0.162 inch]) are required. Use a conductor with low impedance to
ensure circuit overcurrent protection. However, the conductor must have the capability to safely conduct
any faulty current that might be imposed.
If you are installing power on a Release 3.0 ONS 15454 ANSI shelf assembly (15454-SA-NEBS3E,
Note
15454-SA-NEBS3, and 15454-SA-R1), the #12 to #14 AWG (2.053 to 1.628 mm²) power cable and #14
AWG (1.628 mm²) ground cable are required.
September 2005
13-31. The red Fan Fail LED clears after you install a working fan tray.
Red wire for battery connections (–48 VDC).
Black wire for battery return connections (0 VDC).
The battery return connection is treated as DC-I, as defined in Telcordia GR-1089-CORE, Issue 3.
"NTP-G116 Replace the Fan-Tray Assembly" procedure
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
15.12.2 Fan Failure
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