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YD/T 1992-2009 Test specifications for SDH-based multi-service transport platform (MSTP) - Interoperability via email in VALID please email coc@codeofchina.com for quotation
GB/T 32657.2-2016 via email in VALID please email coc@codeofchina.com for quotation
JT/T 627-2005 Technical requirements of VHF marine data communication system for inland waterway (USD) via email in 1-3 business day
GB/T 5438-1985 Characteristics and measuring methods for monophonic and stereophonic transmissions (USD) via email in 1-3 business day VALID
YD/T 1634-2007 Optical Transport Network Physical Layer Interfaces via email in ABOLISHED please email coc@codeofchina.com for quotation
GB/T 2789-1981 Technical requirements for network interface for the analogue microwave relay communication systems via email in 1-3 business day please email coc@codeofchina.com for quotation
YD/T 1744-2009 Security protection requirements for transport network (USD) via email in 1-3 business day VALID
GB/T 13169-1991 General specification for 4MHz (960ch) carrier systems on standardized 1.2/4.4mm coaxial cable pairs (USD) via email in 1-3 business day
GB/T 21645.6-2009 Technical requirements for automatically switched optical network—Part 6:Management plane (USD) via email in 1-3 business day VALID
YD/T 1948.2-2009 Technical Requirement of Ethernet over Transport Part 2:Ethernet UNI and Ethernet NNI via email in VALID please email coc@codeofchina.com for quotation
YD/T 1958-2009 Technical Requirements for PDH Virtual Concatenation and GFP Mapping (USD) via email in 1-3 business day VALID
YD/T 1957.1-2009 Technical Requirements for Automatically Switched Optical Network (ASON) Node Part 1:Technical Requirements for SDH-based ASON Node via email in please email coc@codeofchina.com for quotation
GB/T 20185-2006 Optical interface requirements for equipments and systems relating to the synchronous digital hierarchy via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
T/ITS 0029-2015 The integrated technical requirements for the information system of urban public transit supervision via email in VALID please email coc@codeofchina.com for quotation
GB/T 4110-1983 Pulse code modulation communication system hierarchy (USD) via email in 1-3 business day VALID
MT/T 1007-2006 Information transmission interface for coal mine (USD) via email in 1-3 business day VALID
YD/T 744-2009 Technical requirements and test methods for digital microwave telecommunication equipments(systems)of plesiochronous digital hierarchy (PDH) via email in VALID please email coc@codeofchina.com for quotation
YD/T 1266-2003 Test methods of protection schemes for SDH rings (USD) via email in 1-8 business day VALID
GB/T 3383-1982 Telecommunication transmission unit; Decibel (USD) via email in 1-3 business day VALID
GB/T 17904.1-1999 ISDN user-network interface data link layer specification and conformance testing method Part 1:User-network interface data link layer specification via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
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