Chapter 7. Circuit and Network Redundancy
61200290L1-1 MX2800 User Manual 7-3
CIRCUIT FAILURE RECOVERY MODE
In Circuit Failure Recovery Mode, two controller cards are installed
and a single DS3 line is coming in (see Figure 7-2). In this mode, the
MX2800 can continue operating in the event of a controller card
failure. When both cards are healthy, the primary card actively
processes data while the secondary card stands by ready to take
over if the first fails. The secondary card continuously monitors the
line and remains framed to the incoming signal.
See Table 7-1 on page 7-4 for a list of this mode’s configuration
requirements.
Figure 7-2. Circuit Failure Recovery Mode
During a card switch, service interruption is experienced on both the DS3
and the DSX1 connections. However, since the secondary controller card
remains framed to the incoming signal at all times, it is a minimal inter-
ruption.
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