Management Buses; The Backplane Relationship Between Trichannel And Shuntbus - IBM Nways 8260 Manual

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
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8260 Multiprotocol Intelligent Switching Hub