System and method for transmitting a facsimile via a network
AssigneeConexant Systems, Inc.
InventorJames W. Johnston
Life of this patent
Estimating the term…
Abstract
A data communications system and method are provided, for example, in a facsimile machine to establish a data link with a gateway over a local loop. The data link is established employing pulse code modulation with prioritization in the upstream direction. Alternatively, a modulation type may be employed that is equivalent to pulse code modulation that provides similar or higher speed data communication. By using pulse code modulation in the upstream direction, the resulting facsimile transmission in accomplished with much greater speed.
Claims18
A data communications system in a facsimile machine, comprising:
- a processor coupled to a local interface;
- a memory coupled to the local interface;
- and
- data communications logic stored on the memory and executable by the processor, the data communications logic comprising:
- logic to initiate a virtual data communications link with a peer facsimile machine through a first public switched telephone network (PSTN) link, a first gateway, a network, a second gateway, and a second PSTN link;
- logic to negotiate a data rate with the peer facsimile including logic to determine whether the peer facsimile supports a pulse code modulation (PCM) communications mode;
- logic to transmit a command to the second gateway to employ the PCM communications mode in a downstream direction with the peer facsimile if the peer facsimile supports the PCM communications mode;
- and
- logic to transmit an upstream data signal in the first PSTN link using a pulse code modulation if the peer facsimile supports the PCM communications mode.
A data communications system in a facsimile machine, comprising:
- means for initiating a virtual data communications link with a peer facsimile machine through a first public switched telephone network (PSTN) link, a first gateway, a network, a second gateway, and a second PSTN link;
- means for negotiating a data rate with the peer facsimile including means for determining whether the peer facsimile supports a pulse code modulation (PCM) communications mode;
- means for transmitting a command to the second gateway to employ the PCM communications mode in a downstream direction with the peer facsimile if the peer facsimile supports the PCM communications mode;
- and
- means for transmitting an upstream data signal in the first PSTN link using a pulse code modulation if the peer facsimile supports the PCM communications mode.
A method for data communications in a facsimile machine, comprising the steps of:
- initiating a virtual data communications link with a peer facsimile machine through a first public switched telephone network (PSTN) link, a first gateway, a network, a second gateway, and a second PSTN link;
- negotiating a data rate with the peer facsimile including determining whether the peer facsimile supports a pulse code modulation (PCM) communications mode;
- transmitting a command to the second gateway to employ the PCM communications mode in a downstream direction with the peer facsimile if the peer facsimile supports the PCM communications mode;
- and
- transmitting an upstream data signal in the first PSTN link using a pulse code modulation if the peer facsimile supports the PCM communications mode.
Dependencies are inferred from the claim text.