Intel ER8100STUS - Express 8100 Router Reference Manual page 43

ISDN Services
ISDN Network Interface Reference Configurations
Functional Groups The functional groups are:
NT1/2 (Network Termination)
- NT1 terminates the transmission line from the local exchange
- NT2 handles a variety of functions such as multiplexing and switching
TE1/2 (Terminal Equipment)
- TE1 has an ISDN interface and terminates an ISDN call
- TE2 is similar to TE1 but does not conform to ISDN recommendations
TA (Terminal Adapter—not required for the Intel Express 8100 Router)
Allows a TE2 to be connected to the ISDN. It performs a conversion
between the signalling and user information formats at the R interface and
the ISDN interface. R interfaces are typically V.24 and X.21 interfaces.
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