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GB/T 20851.1-2019E Electronic toll collection—Dedicated short range communication—Part 1:Physical layer (USD) via email in 1-3 business day VALID
GB/T 20851.5-2019E Electronic toll collection—Dedicated short range communication—Part 5:Test methods of the main parameters in physical layer (USD) via email in 1-5 business day VALID
GB/T 15127-2008 Information technology - Telecommunications and information exchange between systems - Twisted pair multipoint interconnections (USD) via email in 1-3 business day VALID
GB/T 20851.1-2007 Electronic toll collection—Dedicated short range communication—Part 1:Physical payer (USD) via email in 1-3 business day ABOLISHED
GB/T 20851.1-2019 Electronic toll collection—Dedicated short range communication—Part 1:Physical layer (USD) via email in 1-3 business day VALID
GB/T 20851.5-2019 Electronic toll collection—Dedicated short range communication—Part 5:Test methods of the main parameters in physical layer (USD) via email in 1-3 business day VALID
GB/T 20851.5-2007 Electronic toll collection—Dedicated short range communication—Part 5:Test methods of the main parameters in physical layer via email in 1-3 business day ABOLISHED please email coc@codeofchina.com for quotation
YD/T 1947-2009 Technical Requirement of Physical Layer for Extended Reach Ethernet based on 2D-PAM3 and 4D-PAM5 via email in VALID please email coc@codeofchina.com for quotation
GB/T 17183-1997 High speed 25-position interface for data terminal equipment and data circuit-terminating equipment,including alternative 26-position connector via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 20851.5-2007/XG1-2012 Electronic toll collection—Dedicated short range communication—Part 5:Test methods of the main parameters in physical layer (USD) via email in 1-3 business day ABOLISHED
GB/T 19897.3-2005 Automatic meter reading system lower layer communication protocol. Part 3: Physical layer services and procedures for connection oriented asynchronous data exchange (USD) via email in 1 business day VALID
GB/T 17534-1998 Information technology--Open Systems Interconnection--Physical service definition via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 13133-1991 Data communication?DTE to DTE physical connection using X.24 interchange circuits with DTE provided timing (USD) via email in 1-3 business day ABOLISHED
GB/T 15123-2008 Information technology - Telecommunication and information exchange between systems - DTE/DCE interface back-up control operation using GB/T 3454 interchange circuits (USD) via email in 1-3 business day VALID
GB/T 20851.1-2007/XG1-2012 Electronic toll collection—Dedicated short range communication—Part 1:Physical payer (USD) via email in 1-3 business day ABOLISHED
GB/T 13133-2008 Information technology - Telecommunication and information exchange between systems - DTE to DTE direct connections (USD) via email in 1-3 business day VALID
GB/T 17535-1998 Information technology--Telecommunications and information exchange between systems--Interface connector and contact assignments for ISDN basic access interface located at reference points S and T via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 17959-2000 Information technology--Telecommunications and information exchange between systems--50-pole interface connector mateability dimensions and contact number assignments (USD) via email in 1-3 business day VALID
GB/T 17559-1998 Information technology--Telecommunications and information exchange between systems--26-pole interface connector mateability dimensions and contact number assignments via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 18235.1-2000 Information technology--High-Performance Parallel Interface--Part 1:Mechanical,electrical and signaling protocol specification (HIPPI-PH) (USD) via email in 1-8 business day VALID
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