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GB - Chinese national standards
Page 1428
GB/T 21638-2025 (28/03/2025)
Microbeam analysis—Guidelines for electron beam microanalysis of defects in steel materials
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 238.80 USD more info
GB/T 21639-2008 (10/04/2008)
The technical requirements of video conferencing service for IP-based network
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 666.80 USD more info
GB/T 21640-2008 (10/04/2008)
Technical standards for cooperation between equipments of IP-based video conference system
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 930.80 USD more info
GB/T 21641-2008 (10/04/2008)
Technique requirements of video conferencing system inter working between different technologies
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 294.80 USD more info
GB/T 21642.1-2008 (10/04/2008)
The technical requirements for video conference system devices based on IP-based network - Part 1: Multipoint Controller
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 198.80 USD more info
GB/T 21642.2-2008 (10/04/2008)
The technical requirements for video conference system devices based on IP-based network - Part 2: Multipoint Processor
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 694.80 USD more info
GB/T 21642.3-2012 (29/06/2012)
Technical requirements for IP video conference system devices - Part 3: multipoint control unit
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 114.80 USD more info
GB/T 21642.4-2012 (29/06/2012)
Technical requirements for IP video conference system devices - Part 4: Gatekeeper
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 270.80 USD more info
GB/T 21643-2008 (10/04/2008)
IP Authentication Header
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 274.80 USD more info
GB/T 21644-2025 (05/10/2025)
General requirements for networks distance learning platform
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 334.80 USD more info
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