Chapter 7 - redundant configurations, Chapter 7 redundant configurations -1, Figure 41. fiber path redundancy -1 – CANOGA PERKINS 2461 E1 Modem User Manual
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EdgeAccess Universal Chassis System
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Chapter 7
Redundant Configurations
For critical circuits where downtime cannot be tolerated, redundant configurations are used. In a
redundant configuration a secondary (inactive), circuit is ready to begin transmitting data. Should
there be a problem on the active circuit, for example, if the system detects loss of signal, the
secondary circuit will take over the actual data payload. Personnel can freely troubleshoot the
problem without disrupting data transmission.
To ensure that the inactive circuit is truly ready to begin transmitting data at any time, a data
stream is continually sent through the inactive modem, and its error rate is continually tested.
There are two types of redundancy:
Fiber Path Redundancy: Allows two pairs of fibers to be connected to the optional redundant
OLIM, as shown in Figure 41. Notice these OLIMs each have two
pairs of Tx and Rx connectors.
2461
2461
RX
RX
TX
TX
RX
TX
TX
RX
E1 or T1
E1 or T1
Figure 41. Fiber Path Redundancy
2461 Modem User Manual
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