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Introduction 213
SmartWare Software Configuration Guide 18 • ISDN Overview
Introduction
This chapter provides an overview of ISDN ports and describes the tasks involved in configuring ISDN ports
in SmartWare.
ISDN ports are the physical ISDN connections on the SmartNode devices. There are two types of ISDN ports:
• The ISDN basic rate interface (BRI), and
• The ISDN primary rate interface (PRI).
A BRI port supports two 64kbit/s B-channels for switched voice or data connections, one 16kbit/s D-channel
for signaling and always-on data transfer. BRI ports are sometimes called S0 ports. The related PSTN access
service is also called Basic Rate Access (BRA).
The PRI port supports thirty 64kbit/s B-channels, one 64kbit/s D-channel and one synchronization timeslot
on a standard E1 (G.704) physical layer. PRI ports are also called S2m ports. The related PSTN access service
is also called Primary Rate Access (PRA).
ISDN reference points
The ISDN standards define a number of reference points on the interfaces between the various equipment
types on an ISDN access line. Figure 31 illustrates these reference points. The understanding of these reference
points and where they are located is necessary for the configuration of the SmartNode ISDN ports.
Figure 31. ISDN reference points
S/T
S
UT
LE
Basic Rate Access point-to-multipoint (S-bus)
Basic Rate Access Line point-to-point
Primary Rate Access Line
PBX
Legend:
TE Terminal Equipment (Phone)
NT1 Network Termination 1 (Modem)
NT2 Network Termination 2 (PBX)
V
TE
NT1
Local Exchange
TE
LT ET
LT ET
TE
Phones
Phone
NT2 NT1
NT2 NT1
TE
Phone
U
U
LT ET
S
T
PBX
LE Local Exchange
LT Line Termination
ET Exchange Termination