JPS6450628A - Transmission level adjusting system for data modulator and demodulator - Google Patents

Transmission level adjusting system for data modulator and demodulator

Info

Publication number
JPS6450628A
JPS6450628A JP62206545A JP20654587A JPS6450628A JP S6450628 A JPS6450628 A JP S6450628A JP 62206545 A JP62206545 A JP 62206545A JP 20654587 A JP20654587 A JP 20654587A JP S6450628 A JPS6450628 A JP S6450628A
Authority
JP
Japan
Prior art keywords
data
level
demodulator
channel
data modulator
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
JP62206545A
Other languages
Japanese (ja)
Inventor
Tateo Kamiya
Masao Hagiwara
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 Platforms Ltd
NEC Corp
Original Assignee
NEC Corp
NEC AccessTechnica 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 NEC Corp, NEC AccessTechnica Ltd filed Critical NEC Corp
Priority to JP62206545A priority Critical patent/JPS6450628A/en
Publication of JPS6450628A publication Critical patent/JPS6450628A/en
Pending legal-status Critical Current

Links

Landscapes

  • Maintenance And Management Of Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To eliminate the sending level adjustment at the site by sending a level suitable for a receiver side equipment automatically through the second channel so as to improve the quality of data communication. CONSTITUTION:A signal of a main channel received by a receiver side data modulator-demodulator 2 is monitored by a reception level detector 4 and if the level is deviated from the specified level, a request to revise the sender level to the sender side data modulator-demodulator 1 is given to a second channel transmitter 5. The second channel transmitter 5, based on its request, uses a band for the data different from a data channel and sends the data to the sender side data modulator-demodulator 1 through an adder 7 and a transmission level adjusting equipment 9. A second channel receiver 8 of the sender side data modulator-demodulator 1 receives the data and requests the transmission level changeover to the transmission level adjusting equipment 9 based on the reception data. The transmission level adjusting device 9, based on the request, switches the level and sends the data to the reception side data modulator-demodulator 2.
JP62206545A 1987-08-21 1987-08-21 Transmission level adjusting system for data modulator and demodulator Pending JPS6450628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62206545A JPS6450628A (en) 1987-08-21 1987-08-21 Transmission level adjusting system for data modulator and demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62206545A JPS6450628A (en) 1987-08-21 1987-08-21 Transmission level adjusting system for data modulator and demodulator

Publications (1)

Publication Number Publication Date
JPS6450628A true JPS6450628A (en) 1989-02-27

Family

ID=16525155

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62206545A Pending JPS6450628A (en) 1987-08-21 1987-08-21 Transmission level adjusting system for data modulator and demodulator

Country Status (1)

Country Link
JP (1) JPS6450628A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006333239A (en) * 2005-05-27 2006-12-07 Nec Electronics Corp Interface apparatus and communication control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006333239A (en) * 2005-05-27 2006-12-07 Nec Electronics Corp Interface apparatus and communication control method

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