Introduction
211
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
U
T
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
Содержание SmartNode Series
Страница 250: ...RIP configuration task list 250 SmartWare Software Configuration Guide 23 RIP configuration rip enabled ...
Страница 635: ...635 Appendix A Terms and definitions Chapter contents Introduction 636 SmartWare architecture terms and definitions 636 ...
Страница 641: ...641 Appendix B Mode summary Chapter contents Introduction 642 ...
Страница 648: ...648 Appendix D Internetworking terms acronyms Chapter contents Abbreviations 649 ...
Страница 653: ...653 Appendix E Used IP ports available voice codecs Chapter contents Used IP ports 654 Available voice codecs 655 ...