JPS6457539A - Three-stage switch - Google Patents

Three-stage switch

Info

Publication number
JPS6457539A
JPS6457539A JP28199987A JP28199987A JPS6457539A JP S6457539 A JPS6457539 A JP S6457539A JP 28199987 A JP28199987 A JP 28199987A JP 28199987 A JP28199987 A JP 28199987A JP S6457539 A JPS6457539 A JP S6457539A
Authority
JP
Japan
Prior art keywords
emergency
switch circuit
output terminal
terminal
input
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.)
Granted
Application number
JP28199987A
Other languages
Japanese (ja)
Other versions
JPH0821279B2 (en
Inventor
Yoshimi Hirata
Hiroteru Yoshifuji
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP28199987A priority Critical patent/JPH0821279B2/en
Publication of JPS6457539A publication Critical patent/JPS6457539A/en
Publication of JPH0821279B2 publication Critical patent/JPH0821279B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To arrange such that the function of connecting any input terminal to any output terminal is not impaired even if any one of switch circuits of 1st to 3rd stage switches fails by providing an emergency line between the input and output terminals. CONSTITUTION:Emergency changeover switch circuits 4-1...4-N/n can choose whether a signal to be outputted to output terminals E1...En is to be routed through a 3rd stage switch circuits 3-1...3-N/n or through an emergency switch circuit 3-(N/n+1). While the connection between an input terminal T1 and the output terminal E1 becomes impossible if the 3rd switch circuit 3-1 fails, the input signal from the emergency switch circuit 3-(N/n+1) is switched to be outputted to the output terminal E1 by means of an emergency changeover switch circuit 4-1. Setting at the emergency switch circuit 3-(N/n+1) to connect a 1st input terminal to a 1st output terminal, and further setting at a 2nd stage switch circuit 2-1 to connect a 1st input terminal and an (N/n+1)-th output terminal, the input terminal T1 is connected again to the output terminal E1.
JP28199987A 1987-04-09 1987-11-10 3-step switch device Expired - Lifetime JPH0821279B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28199987A JPH0821279B2 (en) 1987-04-09 1987-11-10 3-step switch device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP62-52688 1987-04-09
JP5268887 1987-04-09
JP28199987A JPH0821279B2 (en) 1987-04-09 1987-11-10 3-step switch device

Publications (2)

Publication Number Publication Date
JPS6457539A true JPS6457539A (en) 1989-03-03
JPH0821279B2 JPH0821279B2 (en) 1996-03-04

Family

ID=26393330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28199987A Expired - Lifetime JPH0821279B2 (en) 1987-04-09 1987-11-10 3-step switch device

Country Status (1)

Country Link
JP (1) JPH0821279B2 (en)

Also Published As

Publication number Publication date
JPH0821279B2 (en) 1996-03-04

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