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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 by a
qualified system manager. For assistance in diagnosing or replacing a failed part, contact Cisco TAC.
Save the electrostatic bag, foam, and carton. These packaging materials 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 module (IMATM)
Caution Ground yourself before handling the MGX 8220 shelf cards by placing a wrist strap on your wrist
and clipping the wrist strap lead to the cabinet.
When a card has failed, the red fail light for that card turns on. Before replacing it, check to see if the
card needs to be reseated and check that the appropriate back card is correctly installed. After reseating
the card, wait for it to run its self-tests to see if the active light comes on. If the card is seated correctly,
but the fail light is still on, replace 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 screwdriver into the slot in the retaining tab and press until the latch springs
open.
Step 2 Gently pull the card out of the 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 way into the slot and press the retaining tab until it snaps into the vertical
position.
Replacing a Back Card
Back cards are retained through two screws—one at the top of the faceplate and one at the bottom of
the faceplate. Back cards contain very few active components (if any) and rarely need replacing.