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Cisco 6160 Hardware Installation Guide
OL-2190-02 B0
Chapter 2 Preparing for Installation
Safety Requirements
2.1.4 General Maintenance Guidelines
This section covers the following topics:
•
•
Hot Swapping Blower Trays and PEMs, page 2-9
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Installation and Replacement Suggestions, page 2-10
2.1.4.1 Hot Swapping Cards
Hot swapping allows you to remove and replace cards without disconnecting the system power. The
Cisco 6160 chassis supports hot swapping for the following cards:
•
Quad-port flexi ATU-C (4xflexi), quad-port STU-C (4xSDSL), octal-port DMT ATU-C (8xDMT),
octal-port ITU-C (8xIDSL), and octal-port G.SHDSL SHTU-C (8xG.SHDSL) line cards—When the
system detects that you have added or removed a line card, it automatically runs diagnostic and
discovery routines and acknowledges the presence or absence of the line card. If you remove and
replace a line card with one of the same type, the newly installed line card receives the same
provisioning as the original card. The system resumes operation without any operator intervention.
Note
Hot swapping line cards interrupts service for the subscribers assigned to that line card.
•
DS3+T1/E1 IMA, DS3/2DS3, OC-3c/2DS3, or OC-3c/OC-3c NI-2 cards—Hot swapping active
NI-2 cards interrupts service for the entire system until the NI-2 card is replaced or until a redundant
NI-2 takes over system operations. However, you can hot swap standby NI-2 cards without
interrupting service.
2.1.4.2 Hot Swapping Blower Trays and PEMs
The following sections detail the hot swapping guidelines for the blower tray and power entry
module (PEM).
Caution
Only a trained technician should install and remove the PEM and blower tray.
2.1.4.2.1 Blower Trays
The blower tray supports hot swapping. Hot swapping allows you to remove the blower tray without
disconnecting the system power. You do not need to power down the Cisco 6160 to replace the blower
tray. However, if you must remove the blower tray from an operating Cisco 6160, replace it within five
minutes. If that is not possible, power down the system to avoid thermal damage.
2.1.4.2.2 PEMs
The PEM is not hot swappable if there is only one PEM installed in the chassis. If you remove the only
operating PEM from the chassis, power down the system before you begin. Removing the only operating
PEM from the chassis will interrupt service for the entire system until you replace the PEM.
The PEM is hot swappable if there is a secondary PEM installed in the chassis. If the active PEM is
removed, the standby PEM becomes the active PEM and the system continues to operate.
