Maintenance Description
Issue 8.0 July 2002
9-59
Figure 9-18. Dual Ring Interworking Circuit (Normal Transmission)
A 2-way DRI circuit consists of cross-connections in the drop direction (from the
FT-2000 line-switched ring to another ring) and cross-connections in the add
direction (to the FT-2000 line-switched ring from another ring). The following
cross-connections must be entered in the drop direction (Figure 9-18):
â– At the termination node (node 5), a 1-way add cross-connection is entered.
When entering the 1-way add cross-connection, the secondary node
(node 3) must be specified as the destination node. (If an STS-3 tributary is
bridged at one or more nodes in a ring, the last node where the low-speed
signals are terminated must be specified as the destination node.)
Primary Secondary
Low Speed
Interface
Node 4 Node 3
Other
Ring
Node
Other
Ring
Node
FT-2000
Line-Switched
Ring
Node 5
Node 1
Node 2
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