Pulse or digital communications – Repeaters – Testing
Patent
1993-12-08
1994-10-18
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375106, 375116, 375 4, 3701051, H04B 717, H04L 2552
Patent
active
053575423
ABSTRACT:
A repeater station comprises an RFD frame synchronization circuit, an AND gate, and an IFD frame synchronization circuit. The RFD frame synchronization circuit outputs a frame synchronization signal indicating the timing of an auxiliary signal by performing frame synchronization with regard to the RFD. The AND gate inhibits clock signals during periods of the auxiliary signals and allows the clock signals to pass through during the other periods. The IFD frame synchronization circuit performs frame synchronization of the RFD with regard to the IFD by carrying out frame synchronization operation in accordance with the clock signals output from the AND gate. The IFD are accessible in the above simple construction.
REFERENCES:
patent: 4726013 (1988-02-01), Kawashima et al.
patent: 4819226 (1989-04-01), Beckner et al.
patent: 4876683 (1989-10-01), Suzuki
patent: 5113395 (1992-05-01), Murakami et al.
Patent Abstracts of Japan, vol. 10, No. 272 (E-437), Sep. 16, 1986 & JP-A-61 094426 (Nippon Telegr & Teleph Corp (NTT), May 13, 1986.
J. D. Richman & P. C. Smith, "Transmission of Synchronous Digital Hierarchy Signals by Radio," IEEE Internatinoal Conference on Communications ICC '90, vol. 1, Atlanta, Ga., Apr. 16-19, 1990, pp. 81-87.
Chin Stephen
Fujitsu Limited
Vo Don
LandOfFree
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