Interface Configuration
7750 SR OS Interface Configuration Guide Page 91
• Uni-dir 1+1 Sig+Data APS switching mode.
• Configurable L-RDI suppression.
• Active RX circuits are selected based on local conditions only. The SONET K Bytes are
not needed to coordinate switch actions, but they are still used since they flow through and
reach the far-end router.
• Ports are not failed on L-RDI, as L-RDI may be received on both ports momentarily, as a
result of a local radio APS switch or, permanently as a result of a remote router APS
switch (with remote radio selecting traffic from the TX line on the same port as failed RX
line on the router).
• For some radio equipment, a radio can cause an APS switch resulting in the far end radio
detecting radio alarm and generating L-AIS toward its locally attached router on both
circuits. In some cases, that router also detects BER SD/BER SF conditions on both
circuits as well. Therefore, to localize failure recovery, the 7750c12 can optionally
debounce those alarms so a remote router does not invoke an APS switch on a local failure
condition.
Figure 18: 1+1 APS Protected Microwave SDH Transport
77x0 IDU / ODU ODU / IDU 77X0
STM-1/OC-3 RADIO
1 + 1 APS-PROTECTED LINK 1 + 1 APS-PROTECTED LINK
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
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