CHAPTER 1
: INTRODUCTION
Page 1-4
EMME USER’S GUIDE
1.2.1 Multi Media Access Center with Flexible Network
Bus
The Multi Media Access Center with Flexible Network Bus
(MMAC-FNB) provides the platform for the operation of the EMME. The
MMAC backplane provides three Ethernet buses designated as Ethernet
A, B, and C (See Figure 1-1). Cabletron Systems’ non-repeater MIMs
communicate over Ethernet A while Cabletron Systems’ repeater MIMs
use the Ethernet B and C buses. The EMME connects these buses to
provide bridging and management functionality.
There are two types of MMACs supporting Flexible Network Bus
architecture: shunting and non-shunting. Shunting supportive
MMAC-FNBs allow modules operating on either the Ethernet B or C bus
to continue communications with the EMME regardless of whether there
is an empty slot or an Ethernet A bus module between them in the chassis.
Figure 1-1. MMAC Flexible Network Bus
Power & Management Bus
Flexible Network Bus
Ethernet A Bus
Ethernet B Bus
Ethernet C Bus
051431
