JPS60242757A - 直流モデム - Google Patents

直流モデム

Info

Publication number
JPS60242757A
JPS60242757A JP9917384A JP9917384A JPS60242757A JP S60242757 A JPS60242757 A JP S60242757A JP 9917384 A JP9917384 A JP 9917384A JP 9917384 A JP9917384 A JP 9917384A JP S60242757 A JPS60242757 A JP S60242757A
Authority
JP
Japan
Prior art keywords
voltage
diode
fuse
modem
constant voltage
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
JP9917384A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0417576B2 (enExample
Inventor
Kuninosuke Ihira
伊平　國之輔
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 JP9917384A priority Critical patent/JPS60242757A/ja
Publication of JPS60242757A publication Critical patent/JPS60242757A/ja
Publication of JPH0417576B2 publication Critical patent/JPH0417576B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
JP9917384A 1984-05-17 1984-05-17 直流モデム Granted JPS60242757A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9917384A JPS60242757A (ja) 1984-05-17 1984-05-17 直流モデム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9917384A JPS60242757A (ja) 1984-05-17 1984-05-17 直流モデム

Publications (2)

Publication Number Publication Date
JPS60242757A true JPS60242757A (ja) 1985-12-02
JPH0417576B2 JPH0417576B2 (enExample) 1992-03-26

Family

ID=14240257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9917384A Granted JPS60242757A (ja) 1984-05-17 1984-05-17 直流モデム

Country Status (1)

Country Link
JP (1) JPS60242757A (enExample)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5648742A (en) * 1979-09-28 1981-05-02 Fujitsu Ltd Multipoint system
JPS5711552A (en) * 1980-06-25 1982-01-21 Kanagawaken Transmission system for disaster preventing signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5648742A (en) * 1979-09-28 1981-05-02 Fujitsu Ltd Multipoint system
JPS5711552A (en) * 1980-06-25 1982-01-21 Kanagawaken Transmission system for disaster preventing signal

Also Published As

Publication number Publication date
JPH0417576B2 (enExample) 1992-03-26

Similar Documents

Publication Publication Date Title
AU593437B2 (en) Telephone and data overvoltage protection apparatus
US5675640A (en) Telephone ringing signal detector
CN207460205U (zh) 供电电路、中继设备及以太网供电系统
CN112583682B (zh) 总线通信电路及装置
JPS63253867A (ja) 直流−直流電力変換機
WO2019109653A1 (zh) 供电电路、中继设备及以太网供电系统
US7218497B2 (en) Protective circuit for protection against over-voltage for a CAN bus transceiver
CN204613935U (zh) 一种rs485芯片的保护电路和通信电路
WO2012065494A1 (zh) 一种实现串口隔离的方法和串口隔离电路
US4585905A (en) Overvoltage protection circuit for SLIC
Marais RS-485/RS-422 circuit implementation guide
CA1241084A (en) Bidirectional bus arrangement for a digital communication system
US6377434B1 (en) Individual secondary protection device
JPS60242757A (ja) 直流モデム
JPS5976120A (ja) 信号伝達装置におけるサ−ジ保護装置
JPS6253981B2 (enExample)
CN101247236B (zh) 以太网受电设备和以太网受电设备的防护方法
JPS58501610A (ja) 通信ラインのための検出回路
CA2319989A1 (en) Reduced-loss, high-frequency signal transmission system utilizing an over-voltage and over-current protection device
CN215499002U (zh) Poe系统的防护电路和poe防护系统
CN205453744U (zh) 一种自收发防雷击的rs-485电路
JP2002039603A (ja) 通信装置
CN111901130B (zh) 以太网供电设备接口电路及以太网供电设备
EP0132266A1 (en) Direct current cable protection system
CN204304421U (zh) 煤矿井下rs485通讯线路的保护电路