| 摘要 |
A system includes 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 has two bearer channels bandwidth and a data channel. A method of subchannel bandwidth allocation from the bearer channels is initiated by establishing, as demanded for a particular end-user device, a call connection though the telecommunications network between the communications controller and another network terminator. The controller inquires, over the data channel, whether the network terminator is a compatible communications controller. If a positive compatibility indication, the two controllers allocate to the particular end-user device a subchannel from the bandwidth of the two bearer channels, wherein the subchannel consists of bandwidth up to the full 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. If the positive compatibility indication is not received, allocating by the communications controller to the particular end-user device one of the two bearer channels.
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