GB1016273A - Improvements in or relating to telephone signalling systems - Google Patents
Improvements in or relating to telephone signalling systemsInfo
- Publication number
- GB1016273A GB1016273A GB2653862A GB2653862A GB1016273A GB 1016273 A GB1016273 A GB 1016273A GB 2653862 A GB2653862 A GB 2653862A GB 2653862 A GB2653862 A GB 2653862A GB 1016273 A GB1016273 A GB 1016273A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- exchange
- tandem
- terminating
- register
- 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
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
1,016,273. Automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. July 5, 1963 [July 10, 1962], No. 26538/62. Heading H4K. In a V.F. signalling system suitable for use over a T.A.S.I. system at least some of the signals include a prefix signalling condition which is maintained until it is acknowledged by the receiver. The invention is described in relation to the tandem connection of a call via two intercontinental links each employing T.A.S.I. systems in which the risk of " freezeout " might result in non-reception of supervisory signals if the latter were all of predetermined duration. Forward transmission.-In the setting up of a call the originating exchange sends a prefix signal P only. Reception at the tandem exchange results in the reversion, a proceed to send signal X. When this is received by the originating register it sends an inter-register signal kp 2 to retain T.A.S.I. association over the link and to cause seizure of a transit register. This signal also indicates that a tandem connection is required. When the transit register is associated it terminates the proceed-to-send signal thereby causing the originating exchange to send sufficient digits to enable the tandem exchange to connect to the second intercontinental link. Intervals between digits are filled by kp 2 signals. When switching is completed a backward proceed to send X signal is sent causing the originating exchange register to transmit a kp 1 signal indicative of the fact that the rest of the digits will be for a terminating call. At the same time the tandem exchange sends forward a prefix signal P and when this is received at the terminating exchange and a register is associated it sends back a proceed to send an X signal which allows the tandem exchange to transmit the kp 1 signal from the originating exchange. When the terminating exchange receives this it associates a terminating register which terminates the backward proceed to send signal which causes the tandem exchange to terminate the backward proceed to send X signal to the originating exchange. The latter then transmits the remaining digits in the same manner as before. Backward answer signal.-The terminating exchange reverts the prefix P which in due course reaches the originating exchange. Also, recognition of this signal at the tandem exchange also causes the latter to maintain this signal, and also causes an acknowledgement signal Y to be reverted to the terminating exchange. This causes the suffix Y to be sent from the terminating exchange to the tandem exchange receipt of this signal terminating the acknowledgement signal. Likewise, when the originating exchange receives the prefix it sends an acknowledgement signal which is maintained until the Y suffix is sent thereto from the tandem exchange.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2653862A GB1016273A (en) | 1962-07-10 | 1962-07-10 | Improvements in or relating to telephone signalling systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2653862A GB1016273A (en) | 1962-07-10 | 1962-07-10 | Improvements in or relating to telephone signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1016273A true GB1016273A (en) | 1966-01-05 |
Family
ID=10245212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2653862A Expired GB1016273A (en) | 1962-07-10 | 1962-07-10 | Improvements in or relating to telephone signalling systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1016273A (en) |
-
1962
- 1962-07-10 GB GB2653862A patent/GB1016273A/en not_active Expired
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