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

1.4

System Integration

1.4.1 ISDN Applications

The reference model for the ISDN-basic access according to CCITT I series recommendations

consists of

– an exchange and trunk line termination in the central office (ET, LT)

– a remote network termination in the user area (NT)

– a two-wire loop (U interface) between NT and LT

– a four-wire link (S interface) which connects subscriber terminals and the NT in the user

area as depicted in figure 3.

ISDN User Area

TE

TE

ISDN Central Office

S

U

NT

NT1

LT

ET

NT2

NT1

T

ITS02314

Figure 3

ISDN-Basic Subscriber Access Architecture

The NT equipment serves as a converter between the U interface at the exchange and the

S interface at the user premises. The NT may consist of either an NT1 only or an NT1 together

with an NT2 connected via the T interface which is physically identical to the S interface. The

NT1 is a direct transformation between layer 1 of S and layer 1 of U. NT2 may include higher

level functions like multiplexing and switching as in a PBX.

The ISAC-S TE is designed for the user area of the ISDN-basic access, especially for

subscriber terminal equipment with S interfaces. Figure 4 illustrates the application of the

ISAC-S TE.

Semiconductor Group

16

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