Test circuit of multiplex equipment

Details Test circuit of multiplex equipment Test circuit of multiplex equipment

1994-02-25

1995-12-05

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370112, 371 204, 371 205, H04J 314

Patent

active

054735971

ABSTRACT:
In a multiplex and transmission system, multiplex equipment in one station having a plurality of low speed units and a high speed unit, is connected through two transmission lines to other multiplex equipment in another station having a plurality of low speed units and a high speed unit. The system further includes a test circuit of multiplex equipment comprising a switch group for connecting the low speed units in tandem, on an input line and an output line of the low speed unit in each channel in the one station. When a test is carried out, the low speed output of each low speed unit is connected to the low speed input of the next low speed unit. A low speed signal loop back is executed in the low speed units in the other station. A pulse pattern generator is connected to the low speed input of the low speed unit in the first channel in the one station and a certain pulse pattern is supplied to the low speed input. The low speed output of the last low speed unit in the one station is input to an error detector, and bit error is detected in the low speed unit of all the channels in both stations.

REFERENCES:
patent: 4090035 (1978-05-01), Popkin
patent: 4380810 (1983-04-01), Canniff
patent: 4601028 (1986-07-01), Huffman et al.
patent: 5187704 (1993-02-01), Shimada et al.
Charles Chaille et al., "Fehlererkennung und Fehlerlokalisierung in Datannetzen", Telecom Report Beiheft, Digital-Ubertragungstechnik, vol. 2, 1979, pp. 159-163 (English language abstract--original submitted Feb. 3, 1995).
John R. Curran, "Using testing to pick the right Multiplexer", Data Communications International, Jul. 1989, pp. 95-99.
Charles Chaille, et al., "Fehlererkennung und Fehlerlokalisierung in Datannetzen", Telecom Report Beiheft, Digital-Ubertragungstechnik, vol. 2, 1979, pp. 159-163.

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