Isdn Services; Integrated Services Digital Network (Isdn) In The Intel Express; Router - Intel ER8100STUS - Express 8100 Router Reference Manual

ISDN Services

Integrated Services Digital Network (ISDN) in the
Intel Express 8100 Router
ISDN in the Intel Express

8100 Router

Point-to-Point Protocol
(PPP)
ISDN links
20
Basic Rate Access (BRA) ISDN is supported by the following routers:
Express 8100 Router with an ISDN S/T port
which establishes a Basic Rate Interface (BRI) via an ISDN S/T inteface to an
NT-1 termination of the ISDN line
Express 8100 Router with an ISDN U port
which establishes a Basic Rate Interface (BRI) via an ISDN U interface directly
to the incomming ISDN line.
The link protocols used over ISDN links by the Intel Express 8100 Router is the
Point-to-Point Protocol (PPP). PPP is also be used for communicating over
leased line and dial-up (switched) links.
An overview of PPP and the facilities available is given in
Lines Links", p. 8.
For the ISDN Intel Express 8100 Routers, it is possible to configure more ISDN
links (router links) than the number of B-channels available. In this case, ISDN
B-channels can be allocated to ISDN links as follows:
Reserved ISDN B-Channels
ISDN links in the router can be configured to reserve an ISDN B-channel. In this
case, the ISDN link reserving the B-channel always has a B-channel available.
The B-channel reserved by the ISDN link cannot be allocated to another ISDN
link when not in use.
Dynamically allocated ISDN B-Channels
For ISDN links which do not have a reserved ISDN B-channel, a simple link pool
system is used. ISDN B-channels which are not reserved by ISDN links are ob-
tained and returned to the B-channel pool as required by the ISDN links.
Chapter 4
Chapter 2 "Leased