T1 interfaces use an RJ-48 connector. While looking like an RJ-45, the RJ-48 uses STP cabling, a different pinout and voltages. Don't be fooled!
PPP replaced SLIP and offers encrypted authentication and support for protocols other than TCP/IP.
ATM is cell switched while Frame Relay is packet switched.
PPP Sub-layers:
- ISO HDLC: common ground for devices using PPP, enables base features of PPP
- LCP (Link Control Protocol): Where all PPP features are enabled. These are:
- Authentication - PAP or CHAP
- Compression
- Stacker - replace continuous streams with codes
- Predicter - replace data with indexed codes
- Multilink - bundle multiple lines into a single management, load-balanced line
- Callback - security method to dial remote users back at a predefined number
- NCP (Network Control Protocol): common interface for L3 protocols
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