Alcatel-Lucent 7750 SR - Figure 19: 1+1 U-APS-Protected Microwave SDH Transport

Services
7750 SR OS Services Guide Page 75
To facilitate these features, the 7750 SR and 7710 SR performs the following:
1. 1+1 data path (the data is transmitted on both circuits).
2. Active RX circuits are selected based on local conditions only (Kbytes signaling is
used since it flows through and reaches the far-end router).
3. Optionally ignores/does not transmit Kbytes.
4. Does not fail ports 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).
5. 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 7750 SR and 7710 SR
can
optionally debounce those alarms so a remote router does not invoke an APS
switch on a local failure condition.
Figure 19: 1+1 U-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