GB1290278A - - Google Patents
Info
- Publication number
- GB1290278A GB1290278A GB1290278DA GB1290278A GB 1290278 A GB1290278 A GB 1290278A GB 1290278D A GB1290278D A GB 1290278DA GB 1290278 A GB1290278 A GB 1290278A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exchange
- connection
- modem
- switch
- intra
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
1290278 Automatic exchange equipment INTERNATIONAL STANDARD ELECTRIC CORP 19 April 1971 [23 April 1970] 27265/71 Heading H4K In a telecommunication system data is transmitted as frequency modulated signals in one frequency band for transmission within an exchange and in a second frequency band for inter-exchange working and the frequency conversion occurs in an exchange modem which is seized for the inter-exchange connection. Both a data set FSM and a normal telephone set are connected through a modem T-Mo, line Ltg to the exchange switch TKF. For a connection within the exchange, i.e. intra-exchange traffic, a connection set JVS is assigned and the connection established over a further switch JKF. A changeover switch in the modems is now operated to interconnect the data sets through the modulating and demodulating circuits tuned to the intra-exchange frequency band. It is stated to be possible to cause the second data set to respond when unattended either by dialling an additional code or by operating the changeover switch in T-Mol which causes a pilot tone to be transmitted. For an inter-exchange call the connection from the switch TKF is taken through switch RKF and exchange link AVS to trunk A-Ltg. If data is to be transmitted over this connection a centrally disposed modem A-Mo is seized for adapting the intra-exchange signals to interexchange signals. Rerouting through modem A-Mo is obtained by use of a key at the substation or as a result of the operation of the changeover switch in the subscribers modem.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702019800 DE2019800C3 (en) | 1970-04-23 | 1970-04-23 | Transmission system for internal and external data traffic in a telecommunications system, in particular a telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1290278A true GB1290278A (en) | 1972-09-27 |
Family
ID=5769051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1290278D Expired GB1290278A (en) | 1970-04-23 | 1971-04-19 |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE766170A (en) |
CH (1) | CH538232A (en) |
DE (1) | DE2019800C3 (en) |
ES (1) | ES390523A1 (en) |
GB (1) | GB1290278A (en) |
-
1970
- 1970-04-23 DE DE19702019800 patent/DE2019800C3/en not_active Expired
-
1971
- 1971-04-19 GB GB1290278D patent/GB1290278A/en not_active Expired
- 1971-04-21 CH CH578771A patent/CH538232A/en not_active IP Right Cessation
- 1971-04-23 BE BE766170A patent/BE766170A/en unknown
- 1971-04-23 ES ES390523A patent/ES390523A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE766170A (en) | 1971-10-25 |
DE2019800A1 (en) | 1971-11-04 |
DE2019800B2 (en) | 1977-11-17 |
CH538232A (en) | 1973-06-15 |
ES390523A1 (en) | 1973-07-01 |
DE2019800C3 (en) | 1978-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |