Digital tandem channel unit interface for telecommunications net

Details Digital tandem channel unit interface for telecommunications net Digital tandem channel unit interface for telecommunications net

1991-08-30

1994-07-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701051, 3701054, 379224, H04J 306

Patent

active

053274334

ABSTRACT:
A digital tandem channel unit installable in an intermediate central office of a digital carrier telephone network maintains the digital format of the T1 traffic in the course of a DS0 tandem cross-connect, so as to eliminates the possibility of corruption of voice/data traffic, as may occur in a conventional `analog` office cross-connect tandem pair due to quantization errors introduced into the data stream in the course of the digital to analog conversion of the data. Also, the invention incorporates control software in each tandem channel unit's micro-controller that allows it to respond to analog tone signalling test procedures initiated from either two or four-wire channel ports of network access equipment.

REFERENCES:
patent: 4125745 (1978-11-01), Sterdl
patent: 4833675 (1989-05-01), Hekimian et al.
patent: 5014272 (1991-05-01), Yoshida
patent: 5144620 (1992-09-01), Ishizaki et al.

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