ITU M.810:1988
ITU M.810:1988 Setting Up And Lining Up An International Voice-frequency Telegraph Link For Public Telegraph Circuits (for 50,100 And 200 Baud Modulation Rates)
Table of Contents
1Designationofcontrolstations2Organization
3Settingupandliningupavoice-frequencytelegraph
link
4Limitsfortheoveralllossofavoice-frequency
telegraphlink
4.1Nominaloveralllossat1020Hz
4.2Overallloss/frequencydistortion
4.3Changeofoveralllossduetoachange-overto
thereservelineorsection
5Measurementofnoisevoltageonavoice-frequency
telegraphlink
5.1Uniform-spectrumrandomnoise
5.2Impulsivenoise
6Cross-talk
7Group-delay/frequencydistortion
8Frequencyerror
9Interferencecausedbypowersupplysources
10Variationofoveralllosswithtime
11Amplitudehits,shortinterruptionsintransmission
andphasehits
12Recordofresults
13Informationconcerningvoice-frequencytelegraph
terminalequipment
14Markingofcircuitsusedforvoice-frequencytelegraphy
ANNEXA-Basiccharacteristicsoftelegraphequipments
usedininternationalvoice-frequencytelegraph
systems
A.1Limitingpowerperchannel
A.2Telegraphchannelcarrierfrequencies
ANNEXB-LimitsrequiredbyabearercircuitforFMVFT
applicationifthetotalpowertransmittedby
allchannelsissetat50
B.1Loss/frequencydistortion
B.2Randomnoise
B.3Impulsivenoise
B.4Errorrates
B.5Bearerlength
References