US3652802A
Expired / Lapsed
US
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Method of transmitting data over a pcm communication system
Assignee: International Standard Electric Corp
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Filing: 1969-11-14
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Granted: 1972-03-28
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Expires: 1989-11-14
Abstract
Abstract Either one data channel having a high data rate, or several data channels of the same or mixed lower data rate or rates are transmitted in a channel of a TDM-PCM system having a high data rate. The data transmission is performed in synchronism with the PCM system. This is accomplished by having the data frame of the lower data rates related by a multiple to the PCM frame and by adding bits to the data code words to cause equality between the bits of the data code words and the bits of the PCM code words. Further the data is stored in a buffer store, where the bit addition is accomplished, and is read out continuously in the proper channel time slot of the PCM system. To protect against false data frame synchronization due to data code words simulating the data frame synchronization signal, the added bits of certain of the data code words are employed to form a data frame synchronization code word. It is taught herein that conversion from binary coded bits to binary coded ternary code words provides an advantage in transmission of data in a PCM system.
Inventors
- 👤 Arnold Albert Schellenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:48
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/50; H04L12/52; H04L12/525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
345 words
A method of transmitting data over at least one channel of a TDM-PCM communication system having a predetermined PCM frame repetition frequency and PCM code words of a given number of bits comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency predeterminedly related to said PCM frame repetition frequency and PCM code words of a given number of bits Comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency predeterminately related to said PCM frame repetition frequency and each of said data code words having a number of bits less than said given number of bits; adding extra bits to each of said data code words to modify each of said data code words so that the number of bits thereof equal said given number of bits; utilizing certain ones of bits of said modified data code words to provide a data frame synchronization signal as a portion of said modified data code words; transmitting continuously said modified data code words on said one channel of said PCM system to a remote PCM terminal; extracting continuously said extra bits and said data frame synchronization signal from said modified data code words at said remote PCM terminal; and recovering at said remote PCM terminal said data code words under control of said extracted data frame synchronization signal for proper utilization of said data code words; said step utilizing including the step of employing certain ones of said extra bits of a given number of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word; and said step of employing including the steps of selecting said extra bits of a given number of consecutive ones of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word, and rendering said extra bits of the others of said modified data code words identical to one another.
Claim 2
Independent Claim
345 words
A method of transmitting data over at least one channel of a TDM-PCM communication system having a predetermined PCM frame repetition frequency and PCM code words of a given number of bits comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency predeterminedly related to said PCM frame repetition frequency and PCM code words of a given number of bits Comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency predeterminately related to said PCM frame repetition frequency and each of said data code words having a number of bits less than said given number of bits; adding extra bits to each of said data code words to modify each of said data code words so that the number of bits thereof equal said given number of bits; utilizing certain ones of bits of said modified data code words to provide a data frame synchronization signal as a portion of said modified data code words; transmitting continuously said modified data code words on said one channel of said PCM system to a remote PCM terminal; extracting continuously said extra bits and said data frame synchronization signal from said modified data code words at said remote PCM terminal; and recovering at said remote PCM terminal said data code words under control of said extracted data frame synchronization signal for proper utilization of said data code words; said step utilizing including the step of employing certain ones of said extra bits of a given number of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word; and said step of employing including the steps of selecting said extra bits of a given number of consecutive ones of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word, and rendering said extra bits of the others of said modified data code words identical to one another.
Claim 3
Dependent Claim
45 words
A method according to claim 1, wherein said step of transmitting includes the steps of storing said data code words, and reading out said stored data code words at a continuous rate equal to the information rate of said one channel of said PCM system.
Claim 4
Dependent Claim
45 words
A method according to claim 3, wherein said step of transmitting includes the steps of storing said data code words, and reading out said stored data code words at a continuous rate equal to the information rate of said one channel of said PCM system.
Claim 5
Independent Claim
344 words
A method of transmitting data over at least one channel of a TDM-PCM communication system having a predetermined PCM frame repetition frequency and PCM code words of a given number of bits comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency preterminedly related to said PCM frame repetition frequency and each of said data code words having a number of bits less than said given number of bits; adding extra bits to each of said data code words to modify each of said data code words so that the number of bits thereof equal said given number of bits; utilizing certain ones of bits of said modified data code words to provide a data frame synchronization signal as a portion of said modified data code words; transmitting continuously said modified data code words on said one channel of said PCM system to a remote PCM terminal; extracting continuously said extra bits and said data frame synchronization signal from said modified data code words at said remote PCM terminal; and recovering at said remote PCM terminal said data code words under control of said extracted data frame synchronization signal for proper utilization of said data code words; said step utilizing including the step of employing certain ones of said extra bits of a given number of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word; and said step of receiving including accepting said data including a plurality of groups of channel data code words, each of said groups predeterminedly a different data frame repetition frequency predeterminately related to said PCM frame repetition frequency and the repetitiOn frequency of the others of said groups, each of said data code words having a number of bits less than said given number of bits; and combining said plurality of groups to enable achieving in said step of adding an information rate therefore equal to the information rate of said one channel of said PCM system.
Claim 6
Independent Claim
344 words
A method of transmitting data over at least one channel of a TDM-PCM communication system having a predetermined PCM frame repetition frequency and PCM code words of a given number of bits comprising the steps of: receiving said data including a plurality of channel data code words having a data frame repetition frequency preterminedly related to said PCM frame repetition frequency and each of said data code words having a number of bits less than said given number of bits; adding extra bits to each of said data code words to modify each of said data code words so that the number of bits thereof equal said given number of bits; utilizing certain ones of bits of said modified data code words to provide a data frame synchronization signal as a portion of said modified data code words; transmitting continuously said modified data code words on said one channel of said PCM system to a remote PCM terminal; extracting continuously said extra bits and said data frame synchronization signal from said modified data code words at said remote PCM terminal; and recovering at said remote PCM terminal said data code words under control of said extracted data frame synchronization signal for proper utilization of said data code words; said step utilizing including the step of employing certain ones of said extra bits of a given number of said modified data code words to provide said data frame synchronization signal in the form of a synchronizing code word; and said step of receiving including accepting said data including a plurality of groups of channel data code words, each of said groups predeterminedly a different data frame repetition frequency predeterminately related to said PCM frame repetition frequency and the repetitiOn frequency of the others of said groups, each of said data code words having a number of bits less than said given number of bits; and combining said plurality of groups to enable achieving in said step of adding an information rate therefore equal to the information rate of said one channel of said PCM system.
Claim 7
Dependent Claim
37 words
A method according to claim 4, wherein said data frame repetition frequency of each of said groups is an integer multiple of said PCM frame repetition frequency and the repetition frequency of the others of said groups.
Claim 8
Dependent Claim
42 words
A method according to claim 4, wherein each of said code words contain binary coded bits; and said method further includes the step of converting said binary coded bits into binary coded ternary code words for employment in said step of transmitting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |