13-22
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
September 2005
Chapter 13 Maintain the Node
NTP-G114 Inspect, Clean, and Replace the Air Filter
Stop. You have completed this procedure.
NTP-G114 Inspect, Clean, and Replace the Air Filter
Warning
Do not reach into a vacant slot or chassis while you install or remove a module or a fan. Exposed
circuitry could constitute an energy hazard.
Statement 206
Caution Cisco recommends that you inspect the air filter monthly, 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.
Note Although the filter can work if it is installed with either side facing up, Cisco recommends that you
install it with the metal bracing facing up to preserve the surface of the filter.
Step 1 Verify that you are replacing a reusable air filter. The reusable filter is made of a gray, open-cell,
polyurethane foam that is specially coated to provide fire and fungi resistance. NEBS 3E and later
versions of the ONS 15454 use a reusable air filter.
SSM
Quality
Indicates the SSM
timing quality.
8 to 10 SSM quality messages
might be displayed.
For a list of SSM message sets, see the
“21.3 Synchronization Status Messaging” section on
page 21-3.
SSM
Changed
Indicates the date
and time of the
last SSM status
change in
MM/DD/YY
HH:MM:SS
format.
——
Table 13-2 ONS 15454 Timing Report (continued)
Item Description Option Option Description
Purpose This procedure ensures that the air filter is free from dirt and dust, which
allows optimum air flow and prevents dirt and dust from entering the
shelf.
Tools/Equipment Vacuum or detergent and water faucet, spare filter, pinned hex key tool
Prerequisite Procedures None
Required/As Needed As needed
Onsite/Remote Onsite
Security Level None
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