GB831617A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB831617A GB831617A GB2771157A GB2771157A GB831617A GB 831617 A GB831617 A GB 831617A GB 2771157 A GB2771157 A GB 2771157A GB 2771157 A GB2771157 A GB 2771157A GB 831617 A GB831617 A GB 831617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay set
- outgoing
- pulse
- signal
- incoming
- 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
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
831,617. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. Aug. 8, 1958 [Sept. 3, 1957], No. 27711/57. Drawings to Specification. Class 40 (4). Outgoing and incoming relay sets employ voice frequency signals for setting-up, control, and supervision of connections over an interexchange link and add one pulse at the end of each voice frequency digital pulse train before transmission so that the first pulse of each train may be used to effect line-splitting at the incoming relay set. When taken into use the outgoing relay set transmits a voice-frequency pulse to seize the incoming relay set. Impulses are dialled into a mechanical impulse regenerator at the outgoing relay set, the registration in the regenerator being increased by one in response to the end of a digit. At the incoming relay set the first pulse of each digit train operates a line-splitting relay and the remaining pulses of each digit control routing. On reply, a voice frequency pulse constituting an answer signal is reverted to the outgoing relay set to complete the talking path. If the calling party clears first, a release guard lamp lights and a thermal relay is connected up to repeat a clear forward signal which causes the incoming relay set to revert a release guard signal until it has released following selectors. If the calling party clears before a digit is dialled a release alarm lamp lights as well as the release guard lamp and the impulse regenerator stores a single pulse but has its impulsing contacts masked so as not to interfere with the transmission of a clear forward signal. When the incoming relay set returns to normal the release guard signal ceases and the outgoing relay set is released. If the called party clears first a clear back signal is sent and the incoming relay set waits for a clear forward signal from the outgoing relay set before sending back the release guard signal. Where an operator controls the call from the outgoing end the called subscriber may flash his switch hook for attention and cause pulses to revert which are interpreted alternately as clear back and answer signals. It is stated that the inter-exchange link may be a radio channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2771157A GB831617A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to telephone systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2771157A GB831617A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB831617A true GB831617A (en) | 1960-03-30 |
Family
ID=10264056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2771157A Expired GB831617A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to telephone systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB831617A (en) |
-
1957
- 1957-09-03 GB GB2771157A patent/GB831617A/en not_active Expired
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