PSB2186 データシートの表示（PDF） - Siemens AG

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PSB2186

ISDN Subscriber Access Controller for Terminals (ISAC®-S TE)

Siemens AG 

Features

S

TE(1)

TE(8)

TE(1)

PBX (NT2)

CP

LT-S

LT-S

Line

Card

SN LT-T

CP = Central

Processor

SN = Switching

Network

T

U

NT1

= ISAC R -S TE

TE(1)

TE(8)

Direct Subscriber Access

(point-to-point, short and extended

passive Bus)

S

U

NT1

ITS05407

Figure 4

Applications of the ISAC®-S TE (ISDN-Basic Access)

Terminal Applications

The concept of the ISDN basic access is based on two circuit-switched 64 kbit/s B channels

and a message oriented 16 kbit/s D channel for packetized data, signaling and telemetry

information.

Figure 5 shows an example of an integrated multifunctional ISDN-S terminal using the

ISAC-S TE. The ISAC-S TE provides the interface to the bus and separates the B- and

D channels.

The D channel, containing signaling data and packet switched data, is processed by the LAPD

controller contained in the ISAC-S TE and routed via a parallel µP interface to the terminal

processor. The high level support of the LAPD protocol which is implemented by the

ISAC-S TE allows the use of a low cost processor in cost sensitive applications.

The IOM-2 interface generated by the ISAC-S TE is used to connect different voice/data (V/D)

application modules:

– sources/sinks for the D channel

– sources/sinks for the B1- and B2 channels.

Semiconductor Group

17

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