Digital data receivers, methods and circuitry for differentiatin

Details Digital data receivers, methods and circuitry for differentiatin Digital data receivers, methods and circuitry for differentiatin

1994-12-13

1998-02-10

Chin, Stephen

Pulse or digital communications

Receivers

375340, 375377, H03K 900, H04L 2706

Patent

active

057177201

ABSTRACT:
Disclosed are digital data receivers, methods and circuitry for differentiating between signals and data packets of varying physical layer protocols and frequencies transferred over a digital burst mode communications system, such as a packet-based LAN. Transitions in a received input signal to a squelch circuit start a counter which asserts one or more signals at various predetermined times from the transition. The absence or presence of the signal when the next transition in the input signal occurs indicates whether the input signal is less than or greater than a frequency associated with a particular predetermined time interval. When a predetermined number of transitions meeting a particular frequency requirement are received, the input signal is determined to be received at a particular frequency.

REFERENCES:
patent: 5199049 (1993-03-01), Wilson
"23. Physical Coding Sublayer (PCS), Physical Medium Attachment Sublayer (PMA) and Baseband Medium, Type 100Base-T4," Draft Supplement to IEEE Std 802.3, 100Base-T, Oct. 30, 1994, pp. 23-1-23-85.

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