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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Cisco MGX 8220 Shelf
• Main cooling assembly
Cooling booster assembly (for certain multi-shelf configurations only)
• Power entry module (for DC powered systems only)
• AC power assembly (for AC powered systems only)
In addition, an optional Cisco-supplied cabinet is available.
Cisco MGX 8220 Shelf
The Cisco MGX 8220 shelf is a 19-inch rack-mountable unit conforming to the EIA RS-310-C standard
and includes the following measurements:
• 8.75 inches (5u) high
• 17.45 inches wide
• 21.25 inches deep (without cards) or 23 inches deep with back cards and fan connector
The shelf contains a card cage with 16 slots. The slots are numbered 1 to 16 from the left looking at the
front of the shelf.
A backplane runs across the card cage spanning all 16 slots. The backplane is positioned approximately
14 inches from the front of the cage allowing a function module card to be inserted in the slot from the
front and a smaller line module card to be inserted in the slot from the rear.
Slots 1 and 2 are reserved for BNM cards (single or a redundant pair) and slots 3 and 4 are reserved for
ASC cards (single or a redundant pair). Slots 15 and 16 are reserved for the SRM (single or redundant
pair). Slots 1, 3, and 15 work together as an active or standby set. The same is true for slots 2, 4, and
16. Slots 5 to 14 (10 slots) are available for service modules (or IMATM modules). For 1:N redundancy
of T1/E1 service modules, standby cards must use slots 12, 13, and 14.
The shelf can house redundant power entry modules, which are small cards installed horizontally in the
bottom rear of the shelf. The Cisco MGX 8220 shelf is powered by –48V DC power sources (single or
redundant pair). Each power entry module is equipped with a circuit breaker. The shelf also provides a
power receptacle for a cable to the cooling assembly, which is mounted in the rack below the Cisco
MGX 8220 shelf (or shelves).
The backplane provides redundant system buses for communication between slots, power distribution
to all slots, and communication between front and back cards. Figure 2-1 and Figure 2-2 show the front
and rear views of the Cisco MGX 8220 shelf.