PEB2085 Ver la hoja de datos (PDF) - Siemens AG

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PEB2085

ISDN SubscribernAccess Controller ISAC

Siemens AG 

General Information

Introduction

The PEB 2085/2086 ISAC®-S implements the four-wire S/T interface used to link voice/data

terminals to an ISDN.

The PEB 2085 combines the functions of the S-Bus Interface Circuit (SBC: PEB 2080) and the

ISDN Communications Controller (ICC: PEB 2070) on one chip.

The component switches B and D channels between the S/T and the ISDN Oriented Modular

(IOM®) interfaces, the latter being a standard backplane interface for the ISDN basic access.

The device provides all electrical and logical functions of the S/T interface, such as: activation/

deactivation, mode dependent timing recovery and D channel access and priority control.

The HDLC packets of the ISDN D channel are handled by the ISAC-S which interfaces them

to the associated microcontroller. In one of its operating modes the device offers high level

support of layer-2 functions of the LAPD protocol.

The ISAC-S is a CMOS device, available in a P-DIP-40 (PEB 2085 only), P-LCC-44 and

P-MQFP-64 (PEB 2086 only) package. It operates from a single + 5 V supply and features a

power-down state with very low power consumption.

Semiconductor Group

9

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