EP0049568A1 — TASI system including an order wire

Claim 1

Independent Claim 170 words

A method of transmitting channel-to-facility assignment and channel signalling information in a TASI system in which signals from a plurality of channels (100) are interpolated for transmission via a lesser plurality of transmission facilities (101) characterized by comprising the steps of:- providing one of said facilities for the transmission of said information; defining time division multiplex frames (Fig. 3, bits 0 to 47), each frame comprising a plurality of time slots (bits 3 to 7, 11 to 15 , ...43 to 47) forming a first part of the frame and a plurality of time slots (bits 1, 2, 8 to 10, 16 to 18, 24 to 26, 32) forming a second part of the frame; transmitting channel signalling information (SO to S9") via said one facility during said first part of the frames; and transmitting channel-to-facility assignment information (C1 to C6, Al to A6), relating to the assignment of said channels to the other facilities for said interpolated transmission, via said one facility during said second part of the frames.

Claim 2

Independent Claim 170 words

A method of transmitting channel-to-facility assignment and channel signalling information in a TASI system in which signals from a plurality of channels (100) are interpolated for transmission via a lesser plurality of transmission facilities (101) characterized by comprising the steps of:- providing one of said facilities for the transmission of said information; defining time division multiplex frames (Fig. 3, bits 0 to 47), each frame comprising a plurality of time slots (bits 3 to 7, 11 to 15 , ...43 to 47) forming a first part of the frame and a plurality of time slots (bits 1, 2, 8 to 10, 16 to 18, 24 to 26, 32) forming a second part of the frame; transmitting channel signalling information (SO to S9") via said one facility during said first part of the frames; and transmitting channel-to-facility assignment information (C1 to C6, Al to A6), relating to the assignment of said channels to the other facilities for said interpolated transmission, via said one facility during said second part of the frames.

Claim 3

Dependent Claim 154 words

A method as claimed in claim 1 characterized in that channel signalling information for only some of said channels is transnitted during said first part of each frame, the method including the steps of:- determining channels whose signalling information is to be transmitted via said one facility and assigning the determined channels to respective parts (bits 3, 19, 35; 4, 20, 36; ...15, 31, 47) of the first part of the frames for transmission of their signalling information; transmitting channel signalling assignment information (C1 to C6, Al to A6), relating to the assignment of said determined channels to said respective parts of said first part of the frames, via said one facility during said second part of the frames; delaying (708, 710) the signalling information of at least each of said determined channels; and transmitting the delayed signalling information of said determined channels during the respective parts of said first part of the frames.

Claim 4

Dependent Claim 106 words

A method as claimed in claim 2 characterized in that each (e.g. bits 3, 19, 35) of said respective parts of the first part of the frames comprises a plurality of time slots (bits 3, 19, 35) in each frame, for transmission of a plurality of signalling bits (SO, SO', SO") of the relevant determined channel in each frame, and wherein each frame is divided into said parts so that the time slots (e.g. bits 3, 19, 35) of each of said respective parts of the first part of the frames occur periodically in the frames, whereby signalling bits of each determined channel are transmitted periodically.

Claim 5

Dependent Claim 37 words

A method as claimed in claim 2 or 3 characterized in that the step of delaying (708, 710) the signalling information includes the step of removing (708, 726) erroneous pulses from the signalling information during its delay.

Claim 6

Independent Claim 81 words

A method as claimed in any of claims 1 to 4 characterized in that each frame further comprises a plurality of time slots (bits 33, 34, 40, 41, 42) forming a third part of the frame, the method including the step of producing and transmitting via said one facility during said third part of each frame checking information (P1 to P5) which is dependent upon the information (C1 to C6, Al to A6) of said second part of the respective frame.

Claim 7

Independent Claim 46 words

A method as claimed in any of claims 1 to 5 characterized by including the step of transmitting message information (Cl to C6, A1 to A6) via said one facility during said second part of the frames when no assignment information is required to be transmitted.

Claim 8

Independent Claim 94 words

A method as claimed in any of claims 1 to 6 characterized in that the step of providing one of said facilities (101) for the transmission of said information comprises the steps of:- selecting (102) one of said facilities as said one facility; monitoring (119) the other facilities to determine an order of preference of said other facilities for use as said one facility; and in response to errors in information transmitted via the facility currently selected as said one facility, selecting a most preferred one of said other facilities as said one facility.

Claim 9

Dependent Claim 157 words

A TASI system in which speech signals from a plurality of channels (100) are interpolated for transmission via a lesser plurality of transmission facilities (101), characterized in that said system comprises:- means (201) for defining time division multiplex frames on one of said facilities; detecting means (109) for detecting, in respect of each o channel, speech signals to be transmitted; a buffer (110) for storing said speech signals to be transmitted; control means (119) for assigning each channel having speech signals to be transmitted to a respective one of the other facilities for transmission of said speech signals, and for producing channel-to-facility assignment information relating to the assignment; means (119, 110) for supplying the stored speech signals to be transmitted from the buffer to the respective facility for transmission; and transmitting means (114, 104) for transmitting channel signalling information and said channel-to-facility assignment information via said one facility during first and second parts, respectively, of said frames.

Claim 10

Dependent Claim 157 words

A TASI system in which speech signals from a plurality of channels (100) are interpolated for transmission via a lesser plurality of transmission facilities (101), characterized in that said system comprises:- means (201) for defining time division multiplex frames on one of said facilities; detecting means (109) for detecting, in respect of each o channel, speech signals to be transmitted; a buffer (110) for storing said speech signals to be transmitted; control means (119) for assigning each channel having speech signals to be transmitted to a respective one of the other facilities for transmission of said speech signals, and for producing channel-to-facility assignment information relating to the assignment; means (119, 110) for supplying the stored speech signals to be transmitted from the buffer to the respective facility for transmission; and transmitting means (114, 104) for transmitting channel signalling information and said channel-to-facility assignment information via said one facility during first and second parts, respectively, of said frames.

Claim 11

Dependent Claim 138 words

A TASI system as claimed in claim 8 characterized in that said first part of each frame provides for transmission of signalling information for only some of said channels (100), wherein:- said control means (119) comprises means (401) for determining each channel which has channel signalling information to be transmitted via said one facility, for assigning the determined channels temporarily to respective parts of said first part of the frames, and for producing channel signalling assignment information relating to each assignment; and said transmitting means (114, 104) comprises means (705, 713 , 714, 716) for transmitting, via said one facility in said respective parts of said first part of the frames, said channel signalling information of the determined channels and for transmitting via said one facility said channel signalling assignment information in said second part of the frames.

Claim 12

Dependent Claim 27 words

A TASI system as claimed in claim 9 characterized by including delay means (708, 710) for delaying, before transmission, said channel siqnalling information of the determined channels.

Claim 13

Dependent Claim 28 words

A TASI system as claimed in claim 10 characterized in that said delay means (708, 710) includes means (726) for removing erroneous pulses from the channel signalling information.

Claim 14

Dependent Claim 51 words

A TASI system as claimed in claim 8 or 9 characterized in that said transmitting means (114, 104) comprises means (705, 714, 716, 721) for producing and transmitting in a third part of each frame checking information which is dependent upon the information of said second part of the respective frame.

Claim 15

Dependent Claim 65 words

A TASI system as claimed in claim 8 or 9 characterized in that said channels (100) and said transmission facilities (101) comprise telephone lines, the system further including means (105, 106) for converting analog signals incoming on said channels into digital signals for storage in said buffer, and for converting digital signals supplied from said buffer into analog signals for transmission via said other facilities.

TASI system including an order wire

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