Technical data

Chassis Device View

Redundancy

Device Views MicroMMAC-E

2-8 Management Module Guide

Redundancy

SPECTRUM allows redundant circuit connections between any two or more

hub devices that have redundant capability in their Þrmware. A circuit is

established by a cable connection from one port on a primary hub device to one

or more ports on secondary hub devices. The cable connections can use any

valid cable type, including UTP/STP, coaxial, or Þber optic.

Any two or more cable connections create a complete circular circuit pathway

between the two devices. One pathway is always set up as primary and the

others as secondary or backup. The secondary circuit becomes active if the

primary pathway fails. This allows the primary hub device to repeat data

transmission on an alternative module port if a problem exists on the primary

port.

Although circuit connections typically occur between devices in the same

room, the circuit connections can also occur over longer distances between

ßoors or buildings (with the proper cables and associated modules).

Refer to Figure 2-4 for an example of a redundant cable circuit connection

between the device and a secondary hub device.

Figure 2-4. Redundantly Connected Devices

Views related to redundancy are the Repeater Redundancy and Port

Redundancy Views. Descriptions of the Þelds found in these views and step-

by-step instructions on conÞguring your network for redundancy are outlined

in Chapter 5 of SPECTRUM Portable Management Applications for the

MicroMMAC-E.

Source Address Tables are used to determine which frames will be forwarded

through the MicroMMAC-E from one network segment to another. This

section, found in SPECTRUM Portable Management Applications for

MicroMMAC-E

Primary Active Circuit

Backup Inactive Circuit