Figure 11. The Backplane Relationship between TriChannel and ShuntBus
2.5.1 Management Buses
It was mentioned earlier that 42 of the 96 pins on the TriChannel Backplane are
reserved for non-data traffic. Included in these pins are the Management LAN
(MLAN) and the Serial Control Interface (SCI).

2.5.1.1 The Management LAN (MLAN)

The MLAN is a dedicated 10 Mbps Ethernet bus which connects the DMM
(Distributed Management Module) and all the Media Access Control daughter
cards (E-MAC or T-MAC). The MAC daughter cards connect to their respective
networks, T-MAC to token-ring and E-MAC to Ethernet, and provide statistics
about those networks to the DMM via the MLAN. Also, the IP stack provided by
26 8260 Multiprotocol Intelligent Switching Hub