Port circuit for a token ring concentrator having phase lock loo

Details Port circuit for a token ring concentrator having phase lock loo Port circuit for a token ring concentrator having phase lock loo

1992-12-22

1996-07-09

Lee, Thomas C.

Boots, shoes, and leggings

395550, 3642293, 3642707, 364269, 364DIG1, H01J 1300

Patent

active

055353371

ABSTRACT:
A token ring concentrator port circuit including an upstream data node, a downstream data node, a station receiver node, a station transmitter node, a path switch configured to selectively either connect the upstream data node directly to the downstream data node or connect the station receiver and transmitter nodes between the upstream and downstream data nodes, and a timing recovery circuit including a phase locked loop that derives a recovered clock from data from a station connected to the station receiver and transmitter nodes and reclocks the data with the recovered clock before transmitting the data to the downstream data node, the phase locked loop including a constant gain phase detector, the timing recovery circuit including a frequency limiting circuit, the port circuit components being implemented in a common integrated circuit.

REFERENCES:
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patent: 5084870 (1992-01-01), Hutchinson et al.
patent: 5090025 (1992-02-01), Marshall et al.
patent: 5173665 (1992-12-01), Norimatsu
patent: 5276408 (1994-01-01), Norimatsu
patent: 5304954 (1994-04-01), Saito et al.
patent: 5313499 (1994-05-01), Coburn
patent: 5353313 (1994-10-01), Honea
Product sheets for Texas Instruments TMS 38051 and TMS 38052 Ring Interface Circuits (1986).
ANSI/IEEE Std. 802.5-1985, Chapters 6 and 7.

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