GB1433241A - Time division multiplex telecommunications switching system - Google Patents
Time division multiplex telecommunications switching systemInfo
- Publication number
- GB1433241A GB1433241A GB575773A GB575773A GB1433241A GB 1433241 A GB1433241 A GB 1433241A GB 575773 A GB575773 A GB 575773A GB 575773 A GB575773 A GB 575773A GB 1433241 A GB1433241 A GB 1433241A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame period
- exchange
- incoming
- channel
- storage location
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/06—Time-space-time switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Abstract
1433241 Automatic exchange systems PLESSEY CO Ltd 16 Jan 1974 [6 Feb 1973] 5757/73 Heading H4K In an exchange having an incoming access store with one storage location per incoming TDM channel, one of the channels is allocated to non-speech information and a connection is established between the associated storage location and a non-speech information extraction interface at least twice per exchange frame period. The arrangement is intended to prevent the loss of signalling information which may occur due to the frame period on incoming highways under running the exchange frame period. Incoming 32 channel PCM highways 2 each terminate on a 32 location random access store which stores are coupled via a space switching network using electronic crosspoints to outgoing random access stores associated with outgoing highways 2. Speech connections are of the feed wire type and in a channel occurring at a time T one is used for one direction of communication, a time channel occurring at a time is used for the reverse direction where F is the frame period. The or each signal extraction interface is connected as a dummy termination to a respective storage location of the transmit random access store, and an incoming storage location connected to a signalling channel is connected with a transmit location associated with a signal extraction interface twice per frame period using channels in the exchange supermultiplex frame which are separated by half the exchange frame period. It is, however, stated that a triple connection is preferred using slots separated by a third of the frame period to ease the difficulties in determining whether or not a particular signalling PCM code has been transferred a plurality of times.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB575773A GB1433241A (en) | 1973-02-06 | 1973-02-06 | Time division multiplex telecommunications switching system |
ZA740426A ZA74426B (en) | 1973-02-06 | 1974-01-21 | Time division multiplex telecommunications switching system |
AU65151/74A AU482428B2 (en) | 1973-02-06 | 1974-02-01 | Time division multiplex telecommunications switching system |
FR7403726A FR2216744B1 (en) | 1973-02-06 | 1974-02-05 | |
HK286/77A HK28677A (en) | 1973-02-06 | 1977-06-09 | Time division multiplex telecommunications switching system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB575773A GB1433241A (en) | 1973-02-06 | 1973-02-06 | Time division multiplex telecommunications switching system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1433241A true GB1433241A (en) | 1976-04-22 |
Family
ID=9802102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB575773A Expired GB1433241A (en) | 1973-02-06 | 1973-02-06 | Time division multiplex telecommunications switching system |
Country Status (4)
Country | Link |
---|---|
FR (1) | FR2216744B1 (en) |
GB (1) | GB1433241A (en) |
HK (1) | HK28677A (en) |
ZA (1) | ZA74426B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2177873A (en) * | 1985-07-19 | 1987-01-28 | Marconi Electronic Devices | Communications system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA804387B (en) * | 1979-08-10 | 1981-07-29 | Plessey Co Ltd | Channel zero switching arrangements for digital telecommunication exchanges |
-
1973
- 1973-02-06 GB GB575773A patent/GB1433241A/en not_active Expired
-
1974
- 1974-01-21 ZA ZA740426A patent/ZA74426B/en unknown
- 1974-02-05 FR FR7403726A patent/FR2216744B1/fr not_active Expired
-
1977
- 1977-06-09 HK HK286/77A patent/HK28677A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2177873A (en) * | 1985-07-19 | 1987-01-28 | Marconi Electronic Devices | Communications system |
GB2177873B (en) * | 1985-07-19 | 1989-11-22 | Marconi Electronic Devices | Communications system |
Also Published As
Publication number | Publication date |
---|---|
ZA74426B (en) | 1974-11-27 |
FR2216744B1 (en) | 1980-08-14 |
FR2216744A1 (en) | 1974-08-30 |
AU6515174A (en) | 1975-08-07 |
HK28677A (en) | 1977-06-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |