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YD/T 1259-2003 Technical specification for optical safe procedure for Wavelength Division Multiplexing (WDM)system 165 (USD) via email in 1-3 business day VALID
GB/T 7254-1995 Performance and test methods of the second order digital multiplex equipment operating at 8448 kbit/s and using positive justification via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
YD 536-1992 405 (USD) via email in 1-3 business day
YD/T 1000-1999 Performance for data networks providing international frame felay SVC service 210 (USD) via email in 1-3 business day VALID
GB/T 13998-1992 Measuring methods of the magnetic induced longitudinal EMF, magnetic induced voltage with respect to earth, electric induced current and psophometric voltage on telecommunication lines via email in 1-3 business day please email coc@codeofchina.com for quotation
GB/T 5443-1985 The test methods for the technical specifications of ringing and tone for automatic telephone switching network 120 (USD) via email in 1-3 business day VALID
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