THE UPS-4224 ADAPTIVE DIGITAL CONVERTER FOR PRIMARY DIGITAL CHANNEL CONVERSION EQUIPMENT IN THE ANALOG NETWORK OF THE UNIFIED AUTOMATED COMMUNICATIONS NETWORK

The digital channels and circuits set up in existing analog transmissi on systems (ATS) may play a significant role in the digital conversion of the primary network of the Unified Automated Communications Networ k. In the initial stage such channels and circuits will be virtually t he only means for interconnecting isolated digital zones. The digital channels and circuits in an analog transmission system can subsequentl y be used on routes where digital transmission systems (DTS) are not c ost effective for both engineering and economic reasons. Equipment was designed domestically initially for generating primary digital circui ts (PDC) within tertiary group circuits (TGC) of analog transmission s ystems. The primary organizational principles of standard digital chan nels and circuits on the primary analog network of the unified automat ed communications network and the engineering designs for the equipmen t used to generate asynchronous TDCs have been examined in [1, 2]. The PDC generation equipment consists of an asynchronous interface which integrates (extracts) on the transmitting side (the receiving side) as ynchronous signals from two primary digital circuits at 2048 kbits/s e ach into an integrated group signal (GS) at 4224 kbits/s and signal co nverters (UPS-4224) that match the group signal to the ATS group circu it. We will consider engineering designs that have been refined during the preparation of a prototype of the UPS-4224 equipment for testing that have not been described in [1] as well as the results of laborato ry and line testing of the prototype.