Figure 7-1 Networking Protection For Diamond Level Service - Huawei OptiX OSN 7500 Technical Manual

aturesOSN 7500
Technical Manual - System Description
As shown in Figure 7-1, for diamond level service, a path ring (dotted line) is
predefined for an end-to-end protected service between a source node and a
destination node. The service is dual fed at the source node and selectively received
at the destination node according to the QoS. The bidirectional service is similar.
Normally, the receiving end receives service from the upper dotted line. When a failure
occurs to the link or node, the service will be switched to the lower dotted line.
You can also choose not to predefine the path ring, but to calculate two end-to-end
paths (which are not intersecting) from the edge node of the optical network. In such a
case, the service is dual fed at the source end and selectively received at the
destination end, thus guaranteeing the service of diamond level.
The source node sends the dual

Figure 7-1 Networking protection for diamond level service

For gold level service, the logical virtual multiplex section (MS) ring must be
predefined. As shown in Figure 7-2, the bandwidth of Ring 1, Ring 2 and virtual ring
are specified as the user demands. They can be part of the maximum bandwidth of
the optical fiber. Half timeslots of the MS ring are used to protect another half. To
provide gold level service with M:N protection, each link of the service trail calculated
by the edge node of the optical network should belong to a virtual MS ring. By doing so,
a rapid MSP switching can be guaranteed in the case of link or node failure on the
service path. As shown in Figure 7-2, all links of the end-to-end service path belong to
either Ring 1 or Ring 2. If one node fails, the service on Ring 2 can be switched to the
protection path of the ring rapidly.l
traffic on rings
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7-3
7 Intelligent Features
The receive node
selects the traffic