Synchronous Optical NETwork (SONET)
Enterprise Systems Connection (ESCON) over SONET Fiber Channel (FC) over SONET SDH / SONET Fiber Connection (FICON) over SONET (ISC1/ISC3) Packet Over SONET (POS) Automatic Protection Switching (APS ) Unidirectional Path Switched Ring (UPSR) OC-3/STM-1 Signalling OC-12/STM-4 Signalling Path Protected Mesh Network (PPMN) Transaction Language 1 (TL1) 2F Bidirectional Line Switched Ring (BLSR) Linear Add/Drop Muliplexer DS1 Signaling 4F Bidirectional Line Switched Ring (BLSR) OC-192/STM-64 Signalling OC48/STM-16 Signalling DS3 Signaling Data Communication Channel (DCC)
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