Talk:Telephone exchange/Archive 1: Difference between revisions
OneClickArchiver creating 555-test |
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:Many central offices of specific types had a similar arrangement whereby the dialing of a specific 3-digit code followed by the last 4 digits of one's own number would result in the line being rung back. These were test numbers, intended primarily for engineers and installers in the field to use to test and adjust telephone ringers without needing to tie up an operator or other engineer. The actual 3-digit code which was used varied from one office to another - There was no fixed code, but obviously it had to a code which was not in use as a local exchange prefix in the area concerned. [[Special:Contributions/146.90.55.170|146.90.55.170]] ([[User talk:146.90.55.170|talk]]) 19:35, 16 October 2012 (UTC) |
:Many central offices of specific types had a similar arrangement whereby the dialing of a specific 3-digit code followed by the last 4 digits of one's own number would result in the line being rung back. These were test numbers, intended primarily for engineers and installers in the field to use to test and adjust telephone ringers without needing to tie up an operator or other engineer. The actual 3-digit code which was used varied from one office to another - There was no fixed code, but obviously it had to a code which was not in use as a local exchange prefix in the area concerned. [[Special:Contributions/146.90.55.170|146.90.55.170]] ([[User talk:146.90.55.170|talk]]) 19:35, 16 October 2012 (UTC) |
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{{Clear}} |
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==Wrong statement removed== |
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I removed the following because it's wrong: |
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"In [[1971]] the computerized switching system for telephone traffic was invented by |
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[[Erna Schneider Hoover]] and replaced existing hard-wired, mechanical switching equipment." |
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"Computerized" or stored program control (SPC) switching was put into practice as early as 1958 with the early ESS prototypes that Bell Labs made. If one reads the Hoover patent (US Pat. No. 3623007) it can be seen that Hoover didn't invent SPC switching but rather came up with a method for process priority. This is still used today and was an important development, however the above statement is wrong. |
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[[User:Sam Etler|sam]] 14:38, 22 September 2004 (UTC) |
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Revision as of 17:29, 11 September 2023
 | This is an archive of past discussions about Telephone exchange. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
| Archive 1 |
555-test
During the mid 1980's to late 1980's in America in my hometown of Parma, Ohio, there was a "prank" which some people did at a public phone. They would dial 555 then the last four digits of the phone number that appeared on the public phone. Let the phone ring once. Then they would hang up and leave. This would then cause the phone to ring a few seconds later. Of course no one was on the line. This 555-test was also capable of being executed from a private house phone. To the best of my knowledge this 555-test longer works as described.
Can other people please provide further details on the 555-test? — Preceding unsigned comment added by 172.166.104.93 (talk) 12:54, 17 September 2004 (UTC)
- Many central offices of specific types had a similar arrangement whereby the dialing of a specific 3-digit code followed by the last 4 digits of one's own number would result in the line being rung back. These were test numbers, intended primarily for engineers and installers in the field to use to test and adjust telephone ringers without needing to tie up an operator or other engineer. The actual 3-digit code which was used varied from one office to another - There was no fixed code, but obviously it had to a code which was not in use as a local exchange prefix in the area concerned. 146.90.55.170 (talk) 19:35, 16 October 2012 (UTC)
Wrong statement removed
I removed the following because it's wrong:
"In 1971 the computerized switching system for telephone traffic was invented by Erna Schneider Hoover and replaced existing hard-wired, mechanical switching equipment."
"Computerized" or stored program control (SPC) switching was put into practice as early as 1958 with the early ESS prototypes that Bell Labs made. If one reads the Hoover patent (US Pat. No. 3623007) it can be seen that Hoover didn't invent SPC switching but rather came up with a method for process priority. This is still used today and was an important development, however the above statement is wrong.