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GB/T 13159-1991 Networking specifications for digital radio-relay sy-stems (USD) via email in 1-3 business day ABOLISHED
GB/T 13168-1991 General specification for 8MHz (1800ch) carrier systems on standardized 2.6/9.5mm coaxial cable pairs (USD) via email in 1-3 business day
YD/T 1273-2003 Techincal specification for terminal equipment of optical Wavelength Division Multiplexing(WDM)——16×10Gb/s、32×10Gb/s parts (USD) via email in 1-5 business day VALID
YD/T 1961-2009 Technical Requirements for SDH-based Multi-service Transport Platform (MSTP)--Interoperatibility via email in VALID please email coc@codeofchina.com for quotation
GB/T 33711-2017 Mobile laboratory—General technical specification for information transmission system (USD) via email in 1-3 business day VALID
MT/T 1006-2006 Signal converter for coal mine (USD) via email in 1-3 business day VALID
GB/T 9541-1988 2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2 wire leased telephone-type-circuits (USD) via email in 1-10 business day VALID
YD/T 1030-1999 Air Interface Technical Specifications of the 800MHz CDMA Digital Cellular Mobile Telecommunication Network (USD) via email in 1-10 business day VALID
GB/T 15837-2008 Interface requirements for digital synchronization network (USD) via email in 1-5 business day VALID
GB/T 14733.11-1993 Terminology for telecommunications-Telecommnication via email in 1-3 business day ABOLISHED please email coc@codeofchina.com for quotation
YD/T 2003-2009 Technical Requirements for Reconfigurable Optical Add Drop Multiplexing (ROADM) Equipment via email in ABOLISHED please email coc@codeofchina.com for quotation
YD/T 1745-2009 Security protection testing requirements for transport network (USD) via email in 1-5 business day VALID
GB/T 24367.1-2009 Technical requirements for automatically switched optical network (ASON) node— Part 1:Technical requirements for SDH-based ASON node (USD) via email in 1-5 business day VALID
YD/T 1267-2003 Technical specification for synchronization netwrok based on SDH transport network (USD) via email in 1-8 business day VALID
GB/T 14731-2008 Synchronous digital hierarchy (SDH) bit rates (USD) via email in 1-3 business day VALID
GB/T 16858-1997 A far end camera control protocol for videoconferences using data link protocol via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
MT/T 1005-2006 Substation for coal mine (USD) via email in 1-3 business day VALID
YD/T 1810-2008 Testing Methods for SDH-Based MSTP Embedded With MPLS (USD) via email in 1-5 business day VALID
GB/T 17904.2-1999 ISDN user-network interface data link layer specification and conformance testing method Part 2:Data link layer protocol conformance testing method via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 15409-2008 Frame structure for synchronous digital hierarchy signal (USD) via email in 1-3 business day VALID
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