Patton electronic SmartNode 4110 Series ユーザーズマニュアル

Introduction

SmartWare Software Configuration Guide 

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).

The ISDN standards define a number of reference points on the interfaces between the various equipment 
types on an ISDN access line. 

 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