GB1231563A - - Google Patents
Info
- Publication number
- GB1231563A GB1231563A GB1231563DA GB1231563A GB 1231563 A GB1231563 A GB 1231563A GB 1231563D A GB1231563D A GB 1231563DA GB 1231563 A GB1231563 A GB 1231563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- highways
- way
- link
- overflow
- 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
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
1,231,563. Automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. 29 Jan., 1970 [31 Jan., 1969], No. 5372/69. Heading H4K. In a TDM exchange incorporating a twostage crosspoint switching network, the problem of internal blocking is partially overcome by the provision of overflow links between the " outlets " of the switches in one stage. As shown, the " outlets " of each first stage switch S1 are connected to three group equipments GE while the inlets of the second stage switches S2 are connected to junctors which terminate TDM highways. Each group equipment effects conversion between eight TDM highways of the four wire type and two one-way highways VM1, VM2. The latter each comprise eight wires on which the eight serial PCM bits pertaining to a channel of a both-way highway are transmitted in parallel mode. Each both-way highway carries 24 channels utilizing 8 bit serial PCM. The interstage links IS comprise 16 wires (eight Go and eight Return) and carry 192 channels each of which occupies a time equivalent to 1 PCM bit on a both-way highway. The necessary control circuits for multiplexing the bothway highways on to the one-way highways with or without time slot interchange are not described. In setting up a call from say junctor 3 in the second S2 switch to a both-way highway attached to one of the group equipments in the lowermost S1 switch, a link IS6 is chosen preferentially. If this link is subject to blocking during the required time slot (or in all or nearly all slots, in a system providing time slot interchange) then an overflow route involving say link IS4, switch S1 and overflow link OL1 is selected. It is suggested that the completion of overflow through the group equipment associated with this third S1 switch is accomplished by means of logic circuitry included in the group equipment.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB537269 | 1969-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1231563A true GB1231563A (en) | 1971-05-12 |
Family
ID=9794889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1231563D Expired GB1231563A (en) | 1969-01-31 | 1969-01-31 |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE745321A (en) |
CH (1) | CH518666A (en) |
ES (1) | ES376072A1 (en) |
FR (1) | FR2029766A1 (en) |
GB (1) | GB1231563A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0115486A1 (en) * | 1982-07-29 | 1984-08-15 | Western Electric Company, Incorporated | Time multiplex switch for time division switching systems |
ATE37126T1 (en) * | 1984-06-12 | 1988-09-15 | Siemens Ag | ROOM MULTIPLEX COUPLING NETWORK. |
-
1969
- 1969-01-31 GB GB1231563D patent/GB1231563A/en not_active Expired
-
1970
- 1970-01-27 CH CH108570A patent/CH518666A/en not_active IP Right Cessation
- 1970-01-28 FR FR7002937A patent/FR2029766A1/fr not_active Withdrawn
- 1970-01-30 ES ES376072A patent/ES376072A1/en not_active Expired
- 1970-02-02 BE BE745321D patent/BE745321A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR2029766A1 (en) | 1970-10-23 |
BE745321A (en) | 1970-08-03 |
CH518666A (en) | 1972-01-31 |
ES376072A1 (en) | 1972-03-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |