Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
1997-03-12
2001-04-10
Kizou, Hassan (Department: 2662)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
C370S410000, C370S437000, C370S468000
Reexamination Certificate
active
06215796
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to digital communications systems and, in particular, to a system having a communications controller providing access to an integrated service digital network (ISDN).
Devices for interfacing multiple analog telephones to an ISDN line of a telecommunications network are known. For example, International PCT application WO 95/22218 published on Aug. 17, 1995 and U.S. Pat. No. 5,305,312 issued on Apr. 19, 1994 disclose such devices. However, these known devices only support a maximum of two telephones in concurrent use.
It is desirable to support more concurrently active telephones over the single ISDN line.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved ISDN communications controller.
The invention, therefore, according to a first aspect provides in a system having a plurality of end-user devices coupled to a communications controller which is connected to an integrated services digital network (ISDN) line of a telecommunications network, the ISDN line having two bearer channels of predetermined bandwidth and a data channel, a method of subchannel bandwidth allocation comprising the steps of: establishing, as demanded for a particular end-user device, a call connection though the telecommunications network between the communications controller and another network terminator; inquiring, over the data channel, whether the network terminator is a compatible communications controller; responsive to receiving a positive compatibility indication, allocating by the two controllers to the particular end-user device a subchannel from the predetermined bandwidth of the two bearer channels, wherein the subchannel consists of bandwidth up to the predetermined bandwidth if the particular end-user device is a data processing unit or bandwidth sufficient for a controller-encoded voice signal if the particular end-user device is a telephone; responsive to not receiving the positive compatibility indication, allocating by the communications controller to the particular end-user device one of the two bearer channels; and transmitting, over the subchannel or one bearer channel, outgoing signals from and incoming signals to the particular end-user device.
A home access network controller, manifesting the present invention, is a device that may interface subscriber premises telephone equipment with a public switched telephone network, through an ISDN interface. It is intended for residential or small office application, where it provides certain efficiencies and conveniences not previously available in that setting. A primary advantage is the capacity to support more than two and up to five telephones in concurrent use.
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Foley & Lardner
Kizou Hassan
Nortel Networks Limited
Slavitt Mitchell
LandOfFree
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