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- Permanent_signal abstract "Permanent Signal (PS) in US telephony jargon, or Permanent Loop in British usage, is a condition in which a POTS line is off-hook without connection for an extended period of time. This is indicated in modern switches by the silent termination after the off hook tone times out and the telephone exchange computer puts the telephone line on its High & Wet list or Wetlist. In older switches, however, a Permanent Signal Holding Trunk (PSHT) would play either a howler tone or a 480/500 Hz high tone (which would subsequently bleed into adjacent lines via crosstalk). Howler tone is a tone of increasing intensity that is intended to alert telephone users to the fact that the receiver has been left off the hook without being connected in a call.Permanent signal can also describe the state of a trunk that is seized but has not been dialed upon, if it remains in a busy condition (sometimes alerting with reorder).In most mid-20th-century switching equipment, a permanent signal would tie up a junctor circuit, diminishing the ability of the switch to handle outgoing calls. When flooded cables or other conditions made this a real problem, switch staff would open the cable, or paper the off-normal contacts of the crossbar switch, or block the line relay from operating. These methods had the disadvantage of blocking all outgoing calls from that line until it was manually cleared. Manufacturers also sold devices that monitored the talk wires and held up the cutoff relay or crossbar hold magnet until the condition cleared. Some crossbar line circuit designs had a park condition allowing the line circuit itself to monitor the line.Stored program control exchanges finally solved the problem, by setting a bit mask in the scanning program and running a low priority periodic checking program against the wetlist. Depending on software version, a wetlisted line may also be in PLO or lockout state.".
- Permanent_signal wikiPageID "3759848".
- Permanent_signal wikiPageLength "2326".
- Permanent_signal wikiPageOutDegree "21".
- Permanent_signal wikiPageRevisionID "665237872".
- Permanent_signal wikiPageWikiLink Category:Local_loop.
- Permanent_signal wikiPageWikiLink Category:Telephony_signals.
- Permanent_signal wikiPageWikiLink Crossbar_switch.
- Permanent_signal wikiPageWikiLink Crosstalk.
- Permanent_signal wikiPageWikiLink High_tone_(telephony).
- Permanent_signal wikiPageWikiLink Howler_tone.
- Permanent_signal wikiPageWikiLink Junctor.
- Permanent_signal wikiPageWikiLink Junctor_circuit.
- Permanent_signal wikiPageWikiLink Lockout_(telecommunication).
- Permanent_signal wikiPageWikiLink Off-hook.
- Permanent_signal wikiPageWikiLink Off-hook_tone.
- Permanent_signal wikiPageWikiLink Off_hook_tone.
- Permanent_signal wikiPageWikiLink Plain_old_telephone_service.
- Permanent_signal wikiPageWikiLink Reorder_tone.
- Permanent_signal wikiPageWikiLink Silent_termination.
- Permanent_signal wikiPageWikiLink Stored_program_control.
- Permanent_signal wikiPageWikiLink Stored_program_control_exchange.
- Permanent_signal wikiPageWikiLink Telephone_call.
- Permanent_signal wikiPageWikiLink Telephone_exchange.
- Permanent_signal wikiPageWikiLink Telephone_line.
- Permanent_signal wikiPageWikiLink Telephony.
- Permanent_signal wikiPageWikiLink Timeout_(computing).
- Permanent_signal wikiPageWikiLink Timeout_(telecommunication).
- Permanent_signal wikiPageWikiLink Trunking.
- Permanent_signal wikiPageWikiLinkText "Permanent signal".
- Permanent_signal wikiPageWikiLinkText "left off-hook".
- Permanent_signal wikiPageWikiLinkText "permanent loop".
- Permanent_signal wikiPageWikiLinkText "permanent signal".
- Permanent_signal hasPhotoCollection Permanent_signal.
- Permanent_signal wikiPageUsesTemplate Template:Telephony-stub.
- Permanent_signal wikiPageUsesTemplate Template:Unreferenced.
- Permanent_signal subject Category:Local_loop.
- Permanent_signal subject Category:Telephony_signals.
- Permanent_signal hypernym Condition.
- Permanent_signal type Article.
- Permanent_signal type Disease.
- Permanent_signal type Article.
- Permanent_signal type Circuit.
- Permanent_signal comment "Permanent Signal (PS) in US telephony jargon, or Permanent Loop in British usage, is a condition in which a POTS line is off-hook without connection for an extended period of time. This is indicated in modern switches by the silent termination after the off hook tone times out and the telephone exchange computer puts the telephone line on its High & Wet list or Wetlist.".
- Permanent_signal label "Permanent signal".
- Permanent_signal sameAs m.09zh28.
- Permanent_signal sameAs Q7169290.
- Permanent_signal sameAs Q7169290.
- Permanent_signal wasDerivedFrom Permanent_signal?oldid=665237872.
- Permanent_signal isPrimaryTopicOf Permanent_signal.