363-206-285
Applications
Issue 3 June 2001
2-27
Dual Ring Interworking (DRI) 2
In an interconnected ring or DRI topology two rings are connected together at two
geographically separate nodes. In addition to the facility and node failure
protection that a single ring provides, the dual node interconnection between the
rings provides an automatic alternate route in the event of a catastrophic failure at
one of the interconnecting nodes. Typically, such a topology is used to
interconnect a loop feeder access ring to a higher bandwidth interoffice ring as
shown in Figure 2-17. This architecture can withstand any single equipment or
fiber failure in each of the rings or a failure (which could range from a CO
shutdown in the case of fire, for example, or equipment failure, or failure of the
facility connecting the two rings) of either of the two interconnecting nodes without
losing service on either the access ring or the interoffice ring. Such a catastrophic
failure would cause a service outage for a simple ring architecture.
To Next Page
Loading...
Need help?
General
