PSB 7115

The ISAR 34, ISDN Data Access Controller forms an advanced solution for ISDN applications communicating with remote ISDN as well as analog terminals.

The ISAR 34 PSB 7115 follows its predecessor ISAR PSB 7110 which is capable of modem modulation up to 14400 bit/s (V.32bis). The new ISAR 34 has the similar functional architecture and additionally supports modem modulation up to 33600 bit/s (V.34bis). As well the platform is upgradeable to new modem standards (PCM modems) and is able to run algorithms for audio compression (e.g. G.728) or answering machine alternatively. A special version called "ISAR AC" is available for this purpose

The ISAR 34 is designed for data access over ISDN. It can be used in data terminals combining ISDN and analog functionality for communication with remote subscribers. It can also be integrated in fax/modem pools and routers.

The ISAR AC version fits perfectly into H.320/H.324 video conferencing systems, in which it supports both the modem and audio functions.

It integrates two data formatting units which support binary framing, HDLC and ASYNC, which is an asynchronous data formatting according to ITU-T V.14. The data from the formatting units is input data to a fax/modem modulation or V.110 or transparent framing towards the IOM-2 timeslots. As well one channel DTMF generation and detection is
supported in the data pump.

The ISAR 34 operates on the IOM-2 interface in terminal mode (1.536 MHz DCL) and is also designed to operate on line-card IOM-2 interfaces (4.096 MHz DCL).

As the DSP program is downloaded into external memory connected to the memory interface of the ISAR 34, firmware upgrades for new algorithms and future applications are quite easy to realize. For example a further version will fully provide a codec interface to support the Siemens Analog Line Interface Solution ALIS for analog modem applications.

An elaborate mailbox interface with 256 byte buffers in each direction reduces the number of registers to a minimum.

The PSB 7115 ISDN Data Access Controller is a CMOS device offered in a thin quadflat pack package. It operates from a single 3.3 V supply and the inputs are 5V safe.