Figure 73. 2F Ms Spring Connection - Alcatel 1850 TSS-320 Technical Handbook

APS in 2-fiber MS-SPRING
In case of fibre break the APS for 2F MS-SPRING uses a synchronized sequence of "bridge" and
"switch" operations that modify the internal connections of the two NEs adjacent to the failure and
permits the "high priority" traffic to be restored.
Only the NEs adjacent to the failure are interested to the "switch" and "bridge" functions while for all other
NEs the final configuration is a "pass through" of all "protection" (low priority) AU4s.
Figure 74.and Figure 75.on page 126, Figure 76.and Figure 77. on page 127 highlight how the
connections are modified as a consequence of a "bridge " or a "switch" operation.
The Bridge operation is performed on the Tx side while the Switch is performed on the Rx side.
• The "Bridge" operation on the B side has the effect of routing the outgoing "high priority" A
traffic to the outgoing "protection" B capacity.
The Bridge function adds a connection on the opposite side and on the relevant AU protection.
• When a "Switch" operation is working on the B side all the connections having an AU4
belonging to the A working capacity as a source, are replaced by connections having the
incoming B protection traffic as a source. The signals maintain the same end point connection.
The Switch function replaces the incoming flow with a protection one, coming form the opposite
side.
In the same way:
• The "Bridge" operation on the A side has the effect of routing the outgoing "high priority" B
traffic to the outgoing "protection" A capacity.
The Bridge function adds a connection on the opposite side and on the relevant AU protection.
• When a "Switch" operation is working on the A side all the connections having an AU4
belonging to the B working capacity as a source, are replaced by connections having the
incoming A protection traffic as a source. The signals maintain the same end point connection.
Technical Handbook Common
Functional Description
PORT
B A
A
1
6
B
A B
WORKING CHANNELS (AU4#1 TO AU4#8)
PROTECTION CHANNELS (AU4#9 TO AU4#16)

Figure 73. 2F MS SPRING Connection

B A
2 3
5 4
A B
PORT
Alcatel 1850 TSS-320 Rel. 1.1
8DG 07734 AAAA Edition 01
B
A
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