Figure 21: 1+1 Aps Protected Microwave Sdh Transport - Alcatel-Lucent 7750 Configuration Manual

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Port Features

1 + 1 APS-PROTECTED LINK

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

Figure 21: 1+1 APS Protected Microwave SDH Transport

STM-1/OC-3 RADIO

7750 SR Interface Configuration Guide

1 + 1 APS-PROTECTED LINK

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