Patent US3889235A successfully refreshed from Google Patents.
US3889235A
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Method of safeguarding the transmission of the continuous polarity in data transmission systems transferring a polarity reversal in coded form
Assignee: Siemens AG
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Filing: 1973-10-11
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Granted: 1975-06-10
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Expires: 1993-10-11
Abstract
Abstract A method is disclosed for checking and, if necessary, correcting the polarity reversal transmission signals in a PCM data transmission system. An additional cyclic interrogation is made of the potential of the transmitting terminals and the result transmitted in an additional time slot added to each time frame; a number of bits c > OR = 2 is in the additional time slot. Upon receipt, the c bits are checked to determine that all are received without error; if so, then the additional interrogation information is compared to the normal transmitted polarity reversal information and replaces said normal information with a corrected signal in the event of non-correspondence.
Inventors
- 👤 Ulf E Assmus
- 👤 Willy Bartel
- 👤 Horst Hessenmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:35
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04L5/225; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/493
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
225 words
In a telecommunication switching system normally transferring the polarity reversals occurring in asynchronous form on sending terminals of k parallel transmitting lines via a time division multiplex system, the transmission being carried out in synchronous serial form to a receiving terminal in time frames, each of said time frames comprising a plurality of time slots, a method for safeguarding the correct transmission of a continuous polarity signal occurring on any of said k transmitting lines by additional cyclic interrogation of said transmitting lines and forming an additional information about the polarity on each of said k transmitting lines comprising the steps of: transmitting said additional information formed concerning each said transmitting lines in the form of c > OR = 2 bits in at least one additioNal time slot (D) in one of said time frames within said time division multiplex system, where c is the number of bits representing the polarity on one of said transmitting lines, receiving said additional information at said receiving terminal, testing the c bits of said received additional information for correct transmission thereof, comparing said received additional information with said polarity reversal transmitted during a normal transmission via the time division multiplex system to determine noncorrespondence, and replacing the polarity reversal information provided by said normal transmission with said additional information in response to establishing non-correspondence by said testing.
Claim 2
Dependent Claim
225 words
In a telecommunication switching system normally transferring the polarity reversals occurring in asynchronous form on sending terminals of k parallel transmitting lines via a time division multiplex system, the transmission being carried out in synchronous serial form to a receiving terminal in time frames, each of said time frames comprising a plurality of time slots, a method for safeguarding the correct transmission of a continuous polarity signal occurring on any of said k transmitting lines by additional cyclic interrogation of said transmitting lines and forming an additional information about the polarity on each of said k transmitting lines comprising the steps of: transmitting said additional information formed concerning each said transmitting lines in the form of c > OR = 2 bits in at least one additioNal time slot (D) in one of said time frames within said time division multiplex system, where c is the number of bits representing the polarity on one of said transmitting lines, receiving said additional information at said receiving terminal, testing the c bits of said received additional information for correct transmission thereof, comparing said received additional information with said polarity reversal transmitted during a normal transmission via the time division multiplex system to determine noncorrespondence, and replacing the polarity reversal information provided by said normal transmission with said additional information in response to establishing non-correspondence by said testing.
Claim 3
Dependent Claim
49 words
The method as set forth in claim 1, wherein the additional time slot is added to said plurality of time slots in the time frame whereby the time of transmission of each of said time frames is prolonged by the time of said additional time slot (D) (FIG. 1b).
Claim 4
Dependent Claim
72 words
The method as set forth in claim 1, wherein the additional time slot is added to said plurality of time slots in the frame without increase in the time of transmission of said time frame, and comprising the additional step of increasing the bit rate for the transmission of the bits in each of said time frames, whereby the time of transmission of each of said time frames remains unchanged (FIG. 1c).
Claim 5
Dependent Claim
65 words
The method as set forth in claim 1, wherein a coding device is provided at the transmitting portion of said transmission system together with an additional storage, and including the steps of storing the results of said additional cyclic interrogation said k transmission lines in said additional storage, and transmitting said results cyclically through said pulse code modulation coding device in said additional time slot.
Claim 6
Dependent Claim
86 words
The method as set forth in claim 1, wherein said step of transmitting additional information comprises synchronous time division multiplex transmission of polarity reversals and related code line addresses incoming asynchronously to the sending terminal, said receiving terminal including a coding device having an additional storage device for receiving said additional cyclic interrogation information, and wherein said replacing step includes cyclically interrogating said additional storage device by said coding device, and derivation of a correction polarity reversal instruction in the event of detection of said noncorrespondence.
Claim 7
Dependent Claim
112 words
A method as defined in claim 1 including allocating the additional time slots for transmitting results of one of said additional cyclic interrogations of said k lines to a superframe comprising a plurality of successive time frames transmitting the potential of said k lines with c identical bits, the number of frames in said superframe being q c.2k/d wherein d is the number of bits in said additional time slot in one of said time frames, whereby the c bits comprising said additional interrogation result of said one line may be transmitted in any one of the additional time slots in the superframe carrying the polarity reversal information of said one line.
Claim 8
Dependent Claim
40 words
A method as defined in claim 1, wherein all of said c bits relevant to one of said k lines is transmitted in the additional time slot added to the time frame carrying the polarity reversal of said one line.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |