JPS57212895A - Switching system for trunk line at night - Google Patents

Switching system for trunk line at night

Info

Publication number
JPS57212895A
JPS57212895A JP9855481A JP9855481A JPS57212895A JP S57212895 A JPS57212895 A JP S57212895A JP 9855481 A JP9855481 A JP 9855481A JP 9855481 A JP9855481 A JP 9855481A JP S57212895 A JPS57212895 A JP S57212895A
Authority
JP
Japan
Prior art keywords
trunk line
relay
contact
trk
callout
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.)
Pending
Application number
JP9855481A
Other languages
Japanese (ja)
Inventor
Shigeki Hashimoto
Tsuguo Muramoto
Noriyoshi Oohino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9855481A priority Critical patent/JPS57212895A/en
Publication of JPS57212895A publication Critical patent/JPS57212895A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H04M3/51—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing
    • H04M3/515—Night service systems

Abstract

PURPOSE:To use a trunk line connected to a telephone sets at night mode also from other extensions, by switching the switching means at the incoming of a trunk line, monitoring the means with a trunk line during the response and holding this means switchingly. CONSTITUTION:If an incoming call is given at night mode, an R relay in a trunk line TRK is operated with a callout current, and a central controller detects the operation of a contact r1 of the R relay via a scanner SCN to recognize the incoming call. The central controller restores the TL relay via a relay controller RC and switches contacts tl1 and tl2 in a switching device TR to the position in solid lines. In this case, since the contact r0 in the TRK is operated in matching with the callout current, the callout signal flows to a main telephone set EX1 via the contact r0, the incoming call is informed to the EX1 and a call can be made by hooking of the EX1. At this state, the central controller monitors the contact (a) of the monitor relay A in the TRK via the scanner.
JP9855481A 1981-06-25 1981-06-25 Switching system for trunk line at night Pending JPS57212895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9855481A JPS57212895A (en) 1981-06-25 1981-06-25 Switching system for trunk line at night

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9855481A JPS57212895A (en) 1981-06-25 1981-06-25 Switching system for trunk line at night

Publications (1)

Publication Number Publication Date
JPS57212895A true JPS57212895A (en) 1982-12-27

Family

ID=14222899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9855481A Pending JPS57212895A (en) 1981-06-25 1981-06-25 Switching system for trunk line at night

Country Status (1)

Country Link
JP (1) JPS57212895A (en)

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