Method and apparatus for sending faxes over analog cellular
First Claim
1. A method for use in data communications equipment operating on the analog cellular network, the method comprising the steps of;
- receiving through a data terminal equipment port of the data communications equipment a data signal representing a predefined modem command;
classifying the predefined modem command as a local command or a remote command;
if a local command, operating on the predefined modem command; and
if a remote command, transmitting the predefined modem command, in a data modulation format containing facsimile information to a remote facsimile modem, said remote facsimile modem being a PSTN-side facsimile modem of a back-to-back modem pair at a mobile switching center in the analog cellular network.
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Accused Products
Abstract
A cellular modem is configured in one of two modes of fax operation: a standard fax mode or an extended fax mode. In the standard fax mode, the cellular modem completes calls as in the prior art. In the extended fax mode, fax information is transmitted over a cellular-portion of the cellular fax call using a "2-D" fax compression scheme and a data modulation as specified in AT&T Paradyne'"'"'s "Enhanced Throughput Cellular (ETC) Protocol". In this mode of operation, "AT-commands" related to establishing the fax connection are transmitted from the cellular modem to a Mobile Switching Center (MSC) that includes a cellular modem pool. This allows fax-capable terminal equipment at the mobile end of the connection to communicate directly with a far-end fax-capable modem in the MSC notwithstanding the presence of an analog modem at the mobile end.
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Citations
9 Claims
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1. A method for use in data communications equipment operating on the analog cellular network, the method comprising the steps of;
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receiving through a data terminal equipment port of the data communications equipment a data signal representing a predefined modem command; classifying the predefined modem command as a local command or a remote command; if a local command, operating on the predefined modem command; and if a remote command, transmitting the predefined modem command, in a data modulation format containing facsimile information to a remote facsimile modem, said remote facsimile modem being a PSTN-side facsimile modem of a back-to-back modem pair at a mobile switching center in the analog cellular network. - View Dependent Claims (2, 3)
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4. A method for establishing a facsimile telephone call over the analog cellular network to an opposite endpoint, the method comprising the steps of:
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detecting in a modem a start of the facsimile telephone call; switching to an extended mode of operation;
classifying subsequently received "AT-compatible" commands as local or remote;operating on those subsequently received "AT-compatible" commands classified as local; and transmitting, in a data modulation format, those subsequently received "AT-compatible" commands classified as remote, said commands containing facsimile information, to a far-end modem, said far-end modem being a PSTN-side facsimile modem of a back-to-back modem pair at a mobile switching center in the analog cellular network. - View Dependent Claims (5)
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6. Data communications equipment apparatus comprising:
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a data terminal equipment port for receiving signals representative of a sequence of modem commands; and a processor for classifying each modem command of the sequence into either a local command or a remote command and for operating on those modem commands of the sequence that are local and for communicating those modem commands of the sequence that are remote, in a data modulation format containing facsimile information, over the analog cellular network to a remote far-end facsimile modem, said far-end facsimile modem being a PSTN-side facsimile modem of a back-to-back modem pair at a mobile switching center in the analog cellular network. - View Dependent Claims (7)
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8. Data communications equipment apparatus comprising:
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means for receiving a data signal representing a predefined modem command; means for classifying the predefined modem command as a local command or a remote command;
means for operating on the modem command if classified as local; andmeans for transmitting, in a data modulation format, the modem command if classified as remote to a remote facsimile modem, said command containing facsimile information, said remote facsimile modem being a PSTN-side facsimile modem of a back-to-back modem pair at a mobile switching center in the analog cellular network. - View Dependent Claims (9)
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Specification