Specifications

2-6 Cisco MGX 8220 Reference, Release 4.1
MGX 8220 Shelf Hardware
Figure2-3 Front View of the MGX 8220 Shelf with Cards Installed
Figure2-4 Rear View of the MGX 8220 Shelf
MGX 8220 Backplane
The MGX 8220 backplane contains a main system bus and the cell bus for communication between
card slots. The cell bus consists of two pairs of unidirectional buses (for redundancy) which are used
for transferring cells between the cell bus slave modules (FRSM, AUSM, ASC) and the cell bus
master (BNM).
The backplane also contains a local bus which permits the ASC to configure and monitor the BNM
and SRM, a BERT bus for bit error rate testing, and a Redundancy bus for support of 1:N service
module redundancy.
The backplane distributes –48VDC power to all card slots and all modules are hot insertable.