NTP-007: Operation 365-575-102
Page4of6 Issue8.0,July2002
Figure 2 – Five Node Ring (Two Nodes with DRI Cross-Connections and Four
Drops)
In Figure 2, the topology is the same as in Figure 1 but node 0 does not have a 1-way
drop cross-connection. Applying TID rule A to all source nodes and secondary nodes
implies using the same TID as node 0 (or, equivalently, the TID of node 2) for all
cross-connections at all nodes. Application of TID rule B gives different results since
there is no longer a drop cross-connection at node 0. Following are two examples:
• At node 4, TID rule B.4 applies (X = node 4, Y = node 1 and Z=node 4), so the
destinations TID of the 1-way through is set to node 0.
• At node 2, TID rule B.5 applies (X = node 2, Y = node 0 and Z=node 4), so the
destination node TID is set to the same as the TID for node 4. TID rule B.5 also
applies to node 3.
node0
4b
node1
4a
node2
4a
...
4b
node3
4a
node4
4a
1-way-DRI
4b to 1e-6
dest=node2
second=node0
1-way drop
1w-6 to 4a
source=node0
1-way thru
1w-6 to 1e-6
dest=node2
source=node0
1-way drop
1w-6 to 4a
source=node0
1-way-DRI
4b to 1e-6
dest=node4
second=node0
1-way drop
1w-6 to 4a
source=node0
1-way thru
1w-6 to 1e-6
dest=node4
source=node0
1-way drop
1w-6 to 4a
source=node0
1-way thru
1w-6 to 1e-6
dest=node0
source=node0
tpa 849525/01
......
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