Multiplex communications – Wide area network – Packet switching
Patent
1983-11-03
1985-07-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 63, H04Q 1104, H04J 314
Patent
active
045326240
ABSTRACT:
Circuitry for validating the integrity of PCM data transmitted through a digital switching network is shown. The space stage of the switching system requires that appropriate data validity be maintained throughout. A parity scheme is employed to fulfill this requirement. For detection of invalid parity, an alarm notification is sent to the central processing unit (CPU) of the switching system. The CPU may then interrogate the space switching circuitry to determine the particular location of the parity failure. In addition, the circuitry provides for a testing feature, such that, the operation of the parity checking circuits may be validated.
REFERENCES:
patent: 4178479 (1979-12-01), McDonald et al.
patent: 4393490 (1983-07-01), Culley
patent: 4399369 (1983-08-01), Simmons et al.
patent: 4480330 (1984-10-01), Magnusson et al.
"GTD-5EAX-Digital Remote Units" by Puccini et al. in NTG-Fachber (Germany), vol. 73, 1980, pp. 212-216.
"GTD-5EAX A Family of Digital Switches" by Esperseth in GTE Automatic Electric Journal, Sep. 1979, pp. 150-154.
"Adaptation of the GTD-5EAX for International Applications" by Czarnecki et al. in GTE Automatic Electric Journal, Sep.-Oct. 1981, pp. 156-163.
Bogacz Frank J.
GTE Automatic Electric Inc.
Olms Douglas W.
Xiarhos Peter
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