Cabletron Systems EMM-E6 Ethernet - Manual (Page 22)

CHAPTER 1: INTRODUCTION
1-10 EMM-E6 User’s Guide
1.3 THE MMAC WITH FLEXIBLE NETWORK BUS
The Multi Media Access Center with Flexible Network Bus
(MMAC-FNB) provides the operational platform for the EMM-E6. The
MMAC-FNB (backplane) provides two physically separate buses -
Channel A (operating over the MMAC Power and Management bus), and
Channels B and C (on the FNB). Each of these channels/buses allows
different MIM types to access the EMM-E6 (Figure 1-1).
These channels/buses interconnect through the EMM-E6 to provide
bridging or routing and management for all MIMs in the MMAC chassis.
Figure 1-1. MMAC Flexible Network Bus
Two types of MMACs currently support FNB architecture - shunting and
non-shunting. MMACs equipped with shunting backplanes allow
modules operating on Channels B and C to continue communicating with
the EMM-E6, regardless of whether there is an empty slot or an Ethernet
Channel A module between them in the chassis. The following table gives
the part numbers of the MMAC chassis that have shunting capabilities.
Power & Management Bus
Flexible Network Bus
Ethernet A Bus
Ethernet B Bus
Ethernet C Bus
CH1Book Page 10 Wednesday, March 20, 1996 7:48 AM