Cabletron Systems EMM-E6 Ethernet manual Channels E and F

CHAPTER 1: INTRODUCTION

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.

1.5CHANNELS E AND F

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).

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