Cisco Systems 6200 appendix Primary a and Secondary B H-Buses, Ethernet Management Bus

1 Hardware Description	78-5296-02 10/02/98
Figure 1-2	Cisco 6200 Chassis, Rear View

	Dangler cables
Auxiliary port	for subscriber
connector	traffic
	Alarm relay
	connector

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Primary (A) and Secondary (B) H-Buses

The backplane’s primary and secondary H-buses (horizontal buses) link the MPC, NTC, and SLCs. In this release, the primary bus carries all traffic. The buses operate at 160 Mbps total throughput.

Each H-bus has two parts:

•A downstream component broadcasts all cells received from the NTC interface to each SLC. (Logic on the SLC filters and directs cells destined for each port.)

•An upstream component provides a contention mechanism for cells received from subscriber ports to be funneled into the upstream NTC path.

Ethernet Management Bus

A 10Base2-type Ethernet bus in the backplane carries internal management traffic between the cards.

1-4Cisco 6200 User Guide