Fan Failure; Air Filter; Power And Ground Description; Ons 15454 Ansi Power And Ground - Cisco ONS 15454 DWDM Installation And Operation Manual

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Table of Contents

Shelf Hardware Reference

Fan Tray Assembly

13.11.2 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, refer to the Cisco ONS 15454 SONET and DWDM

Troubleshooting Guide. The red Fan Fail LED clears after you install a working fan tray.

The ONS 15454 contains a reusable air filter (for ANSI: 15454-FTF2; for ETSI: 15454E-ETSI-FTF) that

is installed either beneath 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

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.

Ground the equipment according to Telcordia standards or local practices. The following sections

describe power and ground for the ONS 15454 shelves.

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.

September 2004

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.

Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7

13.11.2 Fan Failure