Digital service unit with secondary channel diagnostics

Details Digital service unit with secondary channel diagnostics Digital service unit with secondary channel diagnostics

1985-10-23

1988-05-17

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 84, 370112, H04J 312

Patent

active

047456019

ABSTRACT:
In a method and apparatus for transmitting data over either a DDS-I (74) or DDS-II (DDS-SC) network (34), a primary and secondary channel are accommodated preferably for providing both primary data capability and diagnostics for the network. Primary and secondary channel data are multiplexed with control information in a standard DDS-SC frame. The system timing circuitry is locked to the DDS data rate and means for providing encoding and decoding of bipolar violations is provided so that the digital service unit (DSU) is compatible with both types of digital data service. At power-up, a microcomputer (102) reads the DSU clock frequency and the voltage offset of operational amplifiers and provides adjustment through digital to analog converters (210,294).

REFERENCES:
patent: 3787613 (1974-01-01), Farmer et al.
patent: 4190741 (1980-02-01), Cointot
patent: 4385384 (1983-05-01), Rosbury et al.
patent: 4408325 (1983-10-01), Grover
patent: 4498186 (1985-02-01), Hwang et al.
patent: 4520480 (1985-05-01), Kawai
"Local Distribution System" by Bender, Kneuer and Lawless, The Bell System Technical Journal, vol. 54, No. 5, May-Jun. 1975, pp. 919-942.
"Network Management Systems: the Next Generation" by Lawrence R. Pigeon reprinted from Jul. 1985 edition of Telecommunications.
"Introduction to Communications Management Series", sales brochure by Racal-Milgo, 1982.
AT&T Publication No. 41021, "Digital Data System Channel Interface Specification", Mar. 1973; 41021A addendum.
Bell System Technical Reference Publication Number 41450 entitled "Digital Data System Data Service Unit Interface Specification", Nov. 1981.
AT&T Communications Publication No. 62120 entitled "Digital Data System with Secondary Channel", Apr. 1984.
Codex.TM. Fall 1985 Direct Order Catalog, pp. 30-32 and 36-38.
TeleProcessing Products, Inc., product profile.
Black Box Catalog of Data Communications and Computer Devices, Jul. 1985.

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