T1 Link Features

T1 supports two link protocols: point-to-point protocol (PPP) and TDM.
T1 interfaces support interface loopbacks, including local and remote loopbacks.
PPP on T1 interfaces supports:
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LCP
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IPCP
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MPLSCP
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MLPPP
TDM on T1 interfaces supports:
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Emulates and transparently transmits TDM T1 services.
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Provides CES services using the PWE3 technology.
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Provides structure-aware TDM circuit emulation service over packet switched network (CESoPSN) and structure-agnostic TDM over packet (SAToP) services.