Isdn d channel handler
CA 1262274 C · Owner: Northern Telecom Limited · Inventors: Kun, Randall D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure In an integrated services digital network (ISDN) a telephone subscriber is physically connected to a telephone exchange by a digital signal subscriber loop which provides in time division multiplex (TDM), two B channels and a D channel. The two B channels are used for voice and data at a bit rate of sixty-four kilobits per second each. The D channel is used for packet data and for telephone signalling and supervision at a bit rate of sixteen kilobits per second. An ISDN D channel handler in an exchange termination (ET), collects D channel data from and distributes D channel data to various ISDN subscriber lines. A frame processor in the, D channel handler, …
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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
- Granted October 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 10, 2006.
- 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.