About: Permanent signal

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Permanent signal (PS) in American telephony terminology, 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 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 an off-hook tone (howler tone) or a 480/500 Hz high tone (which would subsequently bleed into adjacent lines via crosstalk). Off-hook 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.

Attributes	Values
rdf:type	yago:WikicatTelephonySignals yago:Abstraction100002137 yago:Communication100033020 disease yago:Signal106791372
rdfs:label	Permanent signal (en)
rdfs:comment	Permanent signal (PS) in American telephony terminology, 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 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 an off-hook tone (howler tone) or a 480/500 Hz high tone (which would subsequently bleed into adjacent lines via crosstalk). Off-hook 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. (en)
dcterms:subject	Local loop Telephony signals
Wikipage page ID	3759848 (xsd:integer)
Wikipage revision ID	1016904259 (xsd:integer)
Link from a Wikipage to another Wikipage	Telephony Local loop Telephony signals Reorder tone Crossbar switch Crosstalk Timeout (telecommunication) Telephone exchange Plain old telephone service Telephone call Trunking Telephone line Off-hook tone Off-hook Stored program control exchange High tone (telephony) Junctor circuit dbr:Lockout_(telecommunication) dbr:Silent_termination
sameAs	Permanent signal Permanent signal Permanent signal Permanent signal Permanent signal
dbp:wikiPageUsesTemplate	dbt:More_citations_needed dbt:Reflist dbt:Telephony-stub
has abstract	Permanent signal (PS) in American telephony terminology, 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 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 an off-hook tone (howler tone) or a 480/500 Hz high tone (which would subsequently bleed into adjacent lines via crosstalk). Off-hook 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 state. (en)
gold:hypernym	Condition
prov:wasDerivedFrom	wikipedia-en:Permanent_signal?oldid=1016904259&ns=0
page length (characters) of wiki page	2502 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Permanent_signal
is Link from a Wikipage to another Wikipage of	On- and off-hook Timeout (computing) Dial tone Direct Access Test Unit Telephone exchange Intercept message Telephone hook TXE List of telephony terminology Off-hook tone Wetlist
is Wikipage redirect of	Wetlist
is foaf:primaryTopic of	wikipedia-en:Permanent_signal

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