Pulse or digital communications – Repeaters – Testing
Patent
1985-11-29
1988-05-17
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
379400, 178 69R, H04L 2534
Patent
active
047456248
ABSTRACT:
A circuit for restoring and converting bipolar customer data signals into a pair of binary signals at a customer data frequency equal to or less than 250 KHz includes a PCM integrated circuit repeater for restoring and converting 1.544 MHz communication signals and transmission lines. Use of the high frequency repeater is enabled by a buffer amplifier connected in series with the input of a repeater amplifier and which has an input connected to a parallel resistance and capacitance network which is connected in series with an ALBO diode of the repeater for automatically inserting loss characteristics in the input signal so that the input signal has characteristics resembling losses of a signal passing through a maximum length transmission line. Fixed equalizer and amplification circuitry restores the original pulse signal magnitude and characteristics. Additionally, the circuit includes a slicing circuit responsive to a customer input clock recovery circuit wherein the phase of the recovered clock is controlled by gating a high frequency input clock signal through a doubling circuit for advancing the phase or through a pulse dropping circuit for retarding the phase.
REFERENCES:
patent: 3578914 (1971-05-01), Simonelli
patent: 3906174 (1975-09-01), Dotter, Jr.
patent: 4007340 (1977-02-01), Russell
patent: 4413240 (1983-11-01), Dyke
patent: 4592068 (1986-05-01), Jessop et al.
Bender et al., "Local Distribution System", The Bell System Technical Journal, vol. 54, No. 5, May-June 1975, pp. 919-942.
Dunbar et al., "Dataport-Channel Units for Digital Data System 56 kb/s Rate", The Bell System Technical Journal, vol. 61, No. 9, Nov. 1982, pp. 2741-2756.
PMI, "RPT-81/RPT-82 PCM Carrier Repeaters", 1981.
EXAR "XR-C277 Low Voltage PCM Repeater IC", Jun. 1981.
Bishop Larry D.
Mantovani John C.
Chin Stephen
Conklin Instrument Corporation
Griffin Robert L.
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