D-Link DI-1750 Reference Manual page 133

The function group are divided as:
Network terminal 1(NT1): implement the function of OSI layer one,including the transmit function of
user's line , loop-back function and channel D competition and so on
Network terminal 2(NT2): also called as intelligent terminal
terminal equipment 1(TE1): Also called as ISDN standard terminal, an user device (such as digital
phone) which conforms to ISDN interface standard.
Terminla equipment 2(TE2): Also called as non-ISDN standard terminal, an user device which does
not conform to the ISDN interface standard
Terminal adatpor(TA): Implement the function of adapt, connect TE2 to ISDN standard interface.
The reference points include:
♦ Reference point R: between TA and non-ISDN standard terminal equipment.
♦ Reference point S: between NT2 and user terminal.
♦
Reference point T: between NT1 and NT2.
♦
Reference point U: between NT1 and line terminal equipment.
According to the difference of regions ,the ISDN switch can be divided into several types: Europe,North
America,Australia, Japan and so on. The protocols they conformed to have many difference.
However ,the ISDN switch of different manufacturer keeps good compatibility between each other.
Therefore, even if the local BRI uses different types of switch with remote end, it will not obstruct the
normal operation of the call.you can use the command "config-isdn switch-type" to set the type of ISDN
switch which connects with your BRI interface.
TEI negotiation has two types: one is execute it at calling, another is to use the command "isdn
tei-negotiation" to configure the ISDN TEI-negotiation.
About ISDN BRI configuration commands, see also "ISDN commands".
5.11.2 ISDN BRI Interface Configuration Task List
The default data-link-layer protocol of ISDN BRI interface is PPP. To implement IP protocol on the ISDN
BRI interface, you need to do the following configurations:
♦ set ISDN parameters
♦ set the IP address of an ISDN BRI interface or enable the address negotiation
♦ set the Dialer map to the destination address
♦ set the data-link-layer protocol PPP and its authentication
♦ set DDR parameters
♦ set related IP route
Refer to the related configuration command for more detail of these settings.
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