Distributed pbx/centrex and pots service over atm/xdsl
CA 2276813 A1 · Owner: Wingrove, Michael J. · Inventors: Knee, Gary; Getchell, Wayne; Hui, Man Him
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to telecommunication systems that facilitate distributed access to voice and data communications (in particular PBX/Centrex and POTS services). A gateway is connected to a PBX or Centrex switch which puts speech and call control signals originating from the PBX or Centrex switch into Asynchronous Transfer Mode (ATM) cells and sends them to an ATM network. The ATM network transports the cells to a Digital Subscriber Loop Access Multiplexer (DSLAM). The DSLAM provides an interface between the ATM network and a Digital Subscriber Loop (DSL) channel connected to the customer premises. A Customer Premises Equipment (CPE) reconstitutes the speech and call control …
Read the whole patent
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 July 6, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 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.