- 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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