Wireline communication system and method of frequency allocation therein
CA 2282222 A1 · Owner: Nortel Networks Corporation · Inventors: Czajkowski, Igor Kajetan; Tate, Christopher Neville; Humphrey, Lesley Derek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To alleviate the requirement to back-off all up-link performance such as by, limiting power spectral density to overcome far-end cross-talk problems otherwise associated with relatively short loop-length wireline links the , present, invention partitions the frequency spectrum based on an estimate of the loop length of a subscriber unit (CPE) modem from an exchange (LTE) modem. Up to a threshold frequency (f max) at which received transmissions from a subscriber, having a longest loop length (115) become indistinguishable by the LTE modem from a noise floor (102), up-link performance on all loop lengths is limited to, correspond to that of the longest loop. At frequencies above the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.