Digital telephone apparatus

Details Digital telephone apparatus Digital telephone apparatus

1981-03-31

1983-06-21

Pellinen, A. D.

Multiplex communications

Wide area network

Packet switching

179 99M, 370105, H04M 1106, H04J 306

Patent

active

043895441

ABSTRACT:
Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable of transmitting PCM speech data and/or digital data from a digital data interface to a peripheral data system. The telephone apparatus comprises an internal data bus to which are connected a digital transceiver, a sync/signalling generator, a serial frame synchronizer and at least one codec/PCM filter. The transceiver transmits and receives digital data to and from the telephone transmission line. The sync/signalling generator repeatedly supplies an 8 bit first data word to the internal data bus containing a binary synchronizing code and a signalling code. Simultaneously, the serial frame synchronizer repeatedly receives from the data bus and decodes an 8 bit first data word containing a synchronizing code and a signalling code. The codec/PCM filter repeatedly receives from and transmits to said internal data bus 8 bit PCM voice samples as additional data words immediately following the first data word. A microcomputer, including a number of input/output devices, receives successive signalling codes from the serial frame synchronizer and repeatedly transmits signalling codes to the sync/signalling generator for communicating with the telephone exchange to which the apparatus is connected.

REFERENCES:
patent: 4203011 (1980-05-01), Coviello
patent: 4241444 (1980-12-01), Kister
patent: 4302629 (1981-11-01), Foulkes et al.
patent: 4339633 (1982-07-01), Ahmed
"Fernsprechendgerate in digitaler Technik" NTZ, vol. 33 (1980), No. 12.
Ericsson Review, vol. 58, No. 3, 1981, pp. 134-141; "PCM Signaling Equipment in the BYB Construction Practice" by Lars-Erik Lorsson.

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