7-4 61204659L1-1A
Section 7, Circuit and Network Redundancy MX2800 STS-1 User Manual
Circuit and Network Failure Recovery Mode
NOTE
The XCV Threshold settings are based on the error rates considered
acceptable on the STS-1 or DS-1 before switching.
3. CIRCUIT AND NETWORK FAILURE RECOVERY MODE
In this mode, two controller cards are installed and connected to two individual STS-1 lines. This mode
provides full STS-1 redundancy. In this mode, the primary controller card is connected to the primary
STS-1 line and the secondary controller card is connected to the secondary STS-1 line. The primary card
and line actively transmit data, while the secondary card remains in standby. Should a failure occur in
either the controller card or the network, then a switchover occurs to the secondary card or network.
The MX2800 STS-1 has the ability to internally re-route the network connection if a controller card and
the opposite network connection fail. For example, in Figure 7-3, failed NET A is connected to healthy
Card A; and healthy NET B is connected to failed Card B. In such an instance, the MX2800 STS-1
automatically re-routes NET B to Card A.
NOTE
The configuration requirements (shown in Table 7-2 on page 3) for both
failure recovery modes are identical with one exception. In Circuit and
Network Failure Recovery mode, set the Network Protection to Enable.
Figure 7-3. Circuit and Network Failure Recovery Mode
MX2800
STS-1
Alternative route between
Alternative route between
cards when Network
Protection is Enabled
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