11. Typical SONET Network ADM ADM TM TM D+R ADM D+R MN MN MN MN DSC DSC ADM ADM DSC TM (Terminal Multiplexer) - an end-point SONET device that converts from SONET to non-SONET format ADM (Add/Drop Multiplexer) - aggregates or splits (grooms) SONET traffic on to one of two SONET links DCS (Digital Cross-Connect) – similar to the ADM but can interconnect a large number of STS-n links MN (Matched Nodes) – used to interconnect SONET rings and provide an alternative path in case of failure D+R (Drop and Repeat Nodes) – used to send duplicate copies of signals along alternate paths
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