Patton electronic SmartNode 4110 Series manual Isdn reference points

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.

Basic Rate Access Line point-to-point

S

TE

Phone

Basic Rate Access point-to-multipoint (S-bus)

NT2

PBX

T

NT1

U

LT ET

LE

Local Exchange

	TE		TE	S/T
		Phones
Primary Rate Access Line
	TE			S
	Phone
Legend:
TE	Terminal Equipment (Phone)
NT1	Network Termination 1 (Modem)
NT2	Network Termination 2 (PBX)

NT1

NT2

PBX

U

TU

NT1

LE	Local Exchange
LT	Line Termination
ET	Exchange Termination

LT ET

	V
LT	ET

Figure 31. ISDN reference points

Introduction 213