Cisco Systems MGX 8230 manual Cell Bus, Pxm-Ui

Chapter 1 Introducing the MGX 8230

MGX 8230 System Overview

Figure 1-7 MGX 8230 Architecture Simple Block Diagram

MGX 8230-PXM		PXM-UI	Maintenance and
			control ports
front card		back card
			LAN ports
Processor
			T1/E1 clocks
			Alarm outputs
		PXM	OC-3, OC-12,or
OC-3, OC-12,or		uplink	T3/E3 feeder link
T3/E3 daughter card		back card
Shared	CBC	Cell buses
		to and from
memory
		service modules
switch	CBC
	MGX 8230 midplane		38377

Cell Bus

The MGX 8230 cell bus (CB) provides high-speed interface between the switch fabric and the service modules.

Figure 1-8shows the overall cell bus distribution of MGX 8230 backplane and Table 1-1lists the specific cell bus allocation to each slot with respect to master and slave cell bus ports.

Each PXM1 supports eight master cell buses and one slave cell bus connected to the backplane. The service modules have two slave cell bus ports, one from each PXM1. The master cell bus ports are CB0 to CB7 and the PXM1 slave ports are referred to as 7S and 8S in Table 1-1.

A cell bus comprises the group of signals used to transfer data between the PXM and a service module. CB 0, 6, 1, 2, 4, and 3 are dedicated service modules, CB5 supports physical slot 6. CB7 supports physical slot 13 as well as the alternate PXM1’s slave port.

There is a connection on cell bus 7 to the alternate PXM1. A PXM1 is able to communicate with the other PXM1 using the slave cell bus port on that card. Slots 8 and 9 only refer to back card slots.

Cisco MGX 8230 Edge Concentrator Installation and Configuration

1-10 Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001