Cisco 4000 Series User Manual

5-8
Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
OL-32185-02
Chapter 5 Install and Upgrade Internal Modules and FRUs
Locate Internal and External Slots
Locate NEBS Module
Note We recommend that you change the air filter every 3 months. However, examine the air filter once a
month (or more often in dusty environments) and replace it if it appears to be excessively dirty or
damaged. To comply with Telecordia GR-63-Core standard air filter requirements for NEBS
deployment, the air filter must be replaced, not cleaned.
Figure 5-3 shows the NEBS module on Cisco 4461 ISR.
Figure 5-3 NEBS Module Locations in Cisco 4461 ISR
Locate Internal and External Slots for Modules on Cisco 4451 ISR
Figure 5-4 shows the locations of internal modules on Cisco 4451 ISR motherboard. Internal modules
include DIMMs, PVDM4, and PoE daughter card. Figure 5-27 shows the location of the available slots
that includes the Integrated Services Card (ISC) slot.
1 SM blank slot for NEBS 2 Power supply unit with reverse flow
3 PoE blank slot for NEBS. PoE is not allowed
for NEBS.
4 NEBS fan tray with reverse flow
5 Air filter for NEBS

Cisco 4000 Series Specifications

General

Brand	Cisco
Model	4000 Series
Category	Network Router
Language	English