Error monitoring in digital transmission systems

Details Error monitoring in digital transmission systems Error monitoring in digital transmission systems

1989-07-31

1992-04-28

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

371 371, 371 377, 370 13, 3701051, 370111, 375108, 375116, H04B 1700, H04L 100, H04J 306

Patent

active

RE0339008

ABSTRACT:
Errors in digital transmission are monitored by employing a cyclical-redundancy-check (CRC). A CRC code word having a predetermined number of bits is generated (via 310) from a block of bits (ESF) of a presently transmitted time division multiplexed (XTDM) signal. The code word bits are then inserted (via 304, 305, 306) into predetermined bit positions of the next subsequent block of bits (ESF) of the XTDM signal. In a receiver (FIG. 7), bits of a presently received time division multiplexed (RTDM) signal are compared (801, 802) to bits of a CRC code word generated from the last previously received block of bits to indicate errors in transmission. In a specific example, a 6-bit CRC code word is employed and the code word bits are inserted into predetermined framing bit positions.

REFERENCES:
patent: 3412380 (1968-11-01), Heller et al.
patent: 3475724 (1969-10-01), Townsend et al.
patent: 3873920 (1975-03-01), Apple, Jr. et al.
patent: 3893072 (1975-07-01), D'Antonio et al.
patent: 4012719 (1977-03-01), Law et al.
patent: 4032885 (1977-06-01), Roth
patent: 4125725 (1978-11-01), Steidl
patent: 4142070 (1979-02-01), Landauer et al.
patent: 4145683 (1979-03-01), Brookhart
patent: 4154948 (1979-05-01), Murasov
patent: 4158193 (1979-06-01), D'Antonio
patent: 4168400 (1979-09-01), de Couasnon et al.
patent: 4206440 (1980-06-01), Doi et al.
patent: 4229792 (1980-10-01), Jensen et al.
patent: 4238852 (1980-12-01), Iga et al.
patent: 4306305 (1981-12-01), Doi et al.
"DS-1 Extended Framing Format", pp. 1-7; DS-1 Extended Framing Format USITA Meeting at AT&T Co., Basking Ridge, N.J., Apr. 16, 1980.
M. T. Manfred et al., "Digital Loop Carrier Systems", The Bell System Technical Journal, vol. 57, No. 4, Apr. 1978, pp. 1129-1156.
CCITT Recommendation X.25, "Interface Between Data Terminal Equipment (DTE) and Data Termination Equipment (DCE) for Terminals Operating in the Packet Mode on Public Data Networks", vol. VIII.2--Rec.X.25, Geneva, 1976, pp. 70-76.
K. Kurahashi et al., "Speech Path System of Digital Transit Exchange", Electrical Communication Laboratories Technical Journal, vol. 28, No. 7, 1979, pp. 1261-1276, (Japanese).
K. Kurahashi et al., "DTS-1 Speech Path System", Review of the Electrical Communications Laboratories, vol. 27, Nos. 9-10, Sep.-Oct., 1979, pp. 728-738.

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