Cabletron Systems EMM-E6 Ethernet Manual De Usuario

Only one EPIM operates at any given time. However, using both EPIM 
slots in a redundancy configuration ensures that if the primary bridging 
port fails, or the connecting cable segment becomes inoperable, the backup 
port automatically takes over the bridging operation. This is referred to as 
Front Panel Redundancy.

As it does for Channels B and C, the EMM-E6 only bridges (i.e., it does 
not repeat) Channel D traffic. When the EMM-E6 receives a frame 
destined for Channel D, it goes through the normal bridging process for 
that frame and filters/forwards the information accordingly.

The EMM-E6 provides interfaces for two optional Bridge Router 
Interface Modules (BRIMs). These modules provide the EMM-E6 with 
additional connectivity for either bridging or routing functions. At the 
same time, BRIMs provide access to various transmission methods.

As bridging modules, BRIMs perform the same functions as EPIMs; they 
transfer packets between different channels. However, unlike EPIMs, 
BRIMs bridge these packets from one transmission type to another (e.g., 
Ethernet to FDDI).

CH1Book  Page 16  Wednesday, March 20, 1996  7:48 AM