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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter Replacing Parts
Parts should be replaced by personnel who have taken Cisco training courses or have been trained b y a
qualified system manager. For assistance i n di agnosing or replacing a failed part, co n tac t C isc o TAC.
Save the electrostatic bag, foam, and carton. The se pa cka gi n g mat erials are needed to return the failed
part to Cisco.
Replacing a Front Card
This section describes how to replace an MGX 8220 front card.
The MGX 8220 shelf front cards are
•MGX 8220 shelf controller (ASC)
•Broadband network module (BNM)
•Service redundancy module (SRM)
•Service modules
•ATM inverse multiplexer network m o du le (IMATM)
Caution Ground yourself before handling the MGX 8220 shelf cards by placing a wrist strap on your wrist
and clipping the wrist strap le ad to th e cabinet.
When a card has failed, the red fa il li gh t for th at ca rd turns on. Before replacing i t, check to see if the
card needs to be reseated and check that the appropriate back card is correctly installed. Af ter reseating
the card, wait for it to run its self-tes ts to see if the active light comes on. If th e card is seated correctly,
but the fail light is still on , r ep la ce the card.
When replacing a card that has no redundant equivalent, the service provided by that card will be
disrupted. Replacing a nonredundant ASC or BNM card brings down the entire shelf. Replacing a
FRSM card brings down the channels that are serviced by that card.
To remove a front card, perform the following steps:
Step 1 Insert a small flathead sc rewdr iver in to th e slot in the retaining tab an d press until the latch sprin g s
open.
Step 2 Gently pull the card out of t he card cage.
To install a front card, perform the following steps:
Step 1 Position the card guides over the appropriate slot at the top and bottom of the card cage.
Step 2 Gently slide the card all the wa y in to th e sl ot and press the retaining tab u nt il it s n ap s i nt o t he vertical
position.
Replacing a Back Card
Back cards are retained thr oug h t wo s c rew s—one at the top of the faceplate and one at the bottom of
the faceplate. Back cards contain ve ry few a ct ive components (if any) and rarely need r epl ac ing.