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Chinese Standard Classification Professional Classification ICS Classification Latest

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Standard No.	Title	Price(USD)	Delivery	Status	Add to Cart
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	$1320.00	via email in 1~3 business day	valid,,2000-6-1
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	$2010.00	via email in 1~3 business day	valid,,2000-6-1
GB/T 18119-2000	Video coding for low bit rate communication	$450.00	via email in 1~3 business day	valid,,2000-10-1
GB/T 18498-2001	Interworking between packet switched public data networks and public maritime mobile satellite data transmission systems	$190.00	via email in 1~3 business day	valid,,2002-6-1
GB/T 19516-2004	The specifications of wired-emergency telephone system of expressway	$364.00	via email in 1~3 business day	superseded,2018-5-1,2004-11-1
GB/T 19516-2017	Wired-emergency telephone system of expressway	$250.00	via email in 1~3 business day	valid,,2018-5-1
GB/T 19856.1-2005	Lighting protection-Telecommunication lines Part 1: Fibre optic installation	$370.00	via email in 1~3 business day	valid,,2006-4-1
GB/T 19856.2-2005	Lightning protection—Telecommunication lines—Part 2:Lines using metallic conductors	$570.00	via email in 1~3 business day	valid,,2006-4-1
GB/T 19897.2-2005	Automatic meter reading system lower layer communication protocol—Part 2:Use of area networks on twisted pair with carrier signalling	$740.00	via email in 1~3 business day	superseded,2019-7-1,2006-4-1
GB/T 20185-2006	Optical interface requirements for equipments and systems relating to the synchronous digital hierarchy	$240.00	via email in 1~3 business day	valid,,2006-10-1
GB/T 21639-2008	The technical requirements of video conferencing service for IP-based network	$810.00	via email in 1~5 business day	valid,,2008-11-1
GB/T 21640-2008	Technical standards for cooperation between equipments of IP-based video conference system	$900.00	via email in 1~5 business day	valid,,2008-11-1
GB/T 21641-2008	Technique requirements of video conferencing system inter working between different technologies	$720.00	via email in 1~5 business day	valid,,2008-11-1
GB/T 21642.1-2008	The technical requirements for video conference system devices based on IP-based network - Part 1: Multipoint Controller	$600.00	via email in 1~5 business day	valid,,2008-11-1
GB/T 21642.2-2008	The technical requirements for video conference system devices based on IP-based network - Part 2: Multipoint Processor	$330.00	via email in 1~3 business day	valid,,2008-11-1
GB/T 21642.3-2012	Technical requirements for IP video conference system devices—Part 3:multipoint control unit	$600.00	via email in 1~3 business day	valid,,2012-10-1
GB/T 21642.4-2012	Technical requirements for IP video conference system devices—Part 4:Gatekeeper	$720.00	via email in 1~3 business day	valid,,2012-10-1
GB/T 21643-2008	IP Authentication Header	$120.00	via email in 1~3 business day	valid,,2008-11-1
GB/T 21644-2008	General Description of Networks Distance Learning	$360.00	via email in 1~3 business day	valid,,2008-11-1
GB/T 21645.1-2008	Technical requirements for Automatically Switched Optical Network - Part 1: Architecture and general requirements	$1500.00	via email in 1~5 business day	valid,,2008-11-1
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