Mode signalling method and apparatus
Assignee3Com Corporation
InventorDale M. Walsh
Life of this patent
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Abstract
A method for identifying that a data communications device is operable in a predetermined mode. The first step of the method provides for generating a frequency division modulation capabilities signal. The generated signal is limited to a predetermined frequency range. The method further provides for superimposing mode identification information upon the generated signal to form a modified signal. Like the generated signal, the modified signal falls within the predetermined range. The superimposed mode identification information may be applied by frequency modulating the generated signal.
Claims23
A method for identifying that a data communications device is operable in a predetermined mode, comprising the steps of:
- generating a frequency division modulated capabilities signal, said generated signal being limited to a predetermined frequency range;
- and
- superimposing mode identification information upon said generated signal to form a modified signal, wherein said modified signal falls within said predetermined range.
A method for identifying that a data communications device is operable in a high speed signalling mode, said method comprising the steps of:
- providing a call modem that is coupled by an analog subscriber loop to a digital telephone network, said digital telephone network being operable to transmit a set of PCM codewords;
- providing an answer modem having a digital connection to said digital telephone network, said answer modem being operable to map information into PCM codewords;
- generating, at said call modem, a call menu signal, wherein said call menu signal comprises a frequency division modulated capabilities signal having a superimposed high speed signalling mode identification signal;
- and
- transmitting said call menu signal from said call modem to said answer modem.
Dependencies are inferred from the claim text.