See the standard of signal transmission in the field of video conferencing
2024-04-10 10:08:30
According to statistics from the International Telecommunication Union (ITU), there are currently 2900 valid recommendations (standards) that define the methods of telecommunication network operation and interaction. But are all standards for video conferencing really necessary? Perhaps they only make things more complicated, vague and confusing? Polycom, which provides collaborative products with open standards, has a deep understanding of the importance of these standards today.
Patented proprietary solutions have led to long-term high investment by customers, and this situation must stop. Meeting and collaboration facilities need to find a connection point, and standards are unifying the connection points of these infrastructures. This demand is greater than ever. A predictable trend shows that more and more customers are changing from using proprietary products to using open standards.
When a converged collaboration solution is not yet a catchy word, it has an impact on companies that are eager to integrate applications into the same network, and makes their facilities interconnected. Communication standards, media protocols, multi-layer routing and switching networks are converging into one point to achieve unified collaboration. Whether it is the products of Avaya, Cisco, Juniper, Nortel, or the customer backbone network formed by the combination of these products, open standards make application convergence and unified collaborative communication come together.
This is the main reason why open standards are important in the video conferencing market. Imagine what happens if there is no standard in the field of video conferencing? It will form a chaotic chaos, a large and powerful company is enough to overwhelm opponents, and inhibit the emergence of competition.
More importantly, these standards make it easier for customers to choose solutions, and have the ability to select products according to common standards, rather than hovering around a limited number of suppliers. Choosing products whose standards are not approved must bear the risk that these standards will be abandoned due to the popularization of other technologies.
Let ’s take a look at some of the standards that are critical in the field of video conferencing and how they are driving the application of collaboration solutions in today ’s communications era.
1. H.323 and SIP
H.323 is a ITU standard that provides a full set of subsets for call setup, control, and payload. The standard is more mature and defines how to be compatible with the previous circuit-switched H.320 standard. On the other hand, Session Initiation Protocol (SIP) is a newly emerging standard defined by IETC. It is designed to provide call settings and control for voice, video and other multimedia applications.
Since SIP is only responsible for providing session connection and session management, and has nothing to do with applications, SIP can be used in multiple fields. Currently, SIP is bringing the most extensive interconnection to the conference market.
The freedom provided by these standards enables customers who use video conferencing products and solutions to make the best choices to meet their needs. From time division multiplexing (TDM) to H.323 or SIP has become a natural evolution, although the two themselves are not mutually exclusive.
Today, SIP IP phones, group video conferencing systems, audio conferencing media servers for service providers, and multipoint control units for audio and video conferencing that are compatible with both H.323 and SIP are available everywhere on the market. SIP's support for video conferencing services is currently in the "pre-standard" phase, so existing products can be tested on-site and interconnected.
H.323 and SIP have some of the same problems in security, network address translation (NAT) and traditional firewalls, so when deploying H.323 and SIP-based video conferencing, VPN can provide a solution for network administrators.
2. H.239
According to ITU-T recommendations, H.239 is an international standard for using, controlling, and labeling two simultaneous video channels in a video conference. The H.239 approved by the ITU in July 2003 allows systems from multiple vendors to work collaboratively on ISDN (H.320) and IP (H.323) networks.
Although some existing standards such as H.323 have always supported multiple video channels, H.239 adds the important ability to "tag" each channel task in the conference. In H.329, each video channel gets a "task label", which indicates the purpose of the channel and how each channel is presented to the audience.
3. H.264
As the latest video compression industry standard, H.264 enables video conferencing users to experience significantly improved video quality at the same rate, or to achieve current video quality at almost half the rate of the past. For example, users are accustomed to 768kbit / s high-quality video obtained under H.263 encoding, which can be obtained at a rate of 384kbit / s on H.264.
4. H.235 v3
Because of the numerous security risks like viruses and hacking attacks, network administrators do not want to compromise the integrity of the corporate network, and are reluctant to configure IP-based audio and video applications (the latter is just like computer networks for uninvited guests Viruses and hacking attacks). The H.235 v3 standard approved by the ITU in June 2003 describes how to use the "Advanced Encryption Standard 1 (AES)" video conferencing system to combine security service authentication and call privacy, and provide some improvements: such as security documents (simple Passwords and complex digital signatures), new security countermeasures and reverse service support, etc.
5. IEEE 1329 Level 1
Finally, the standard that does not involve the audio conference part is imperfect, because it is generally believed that when the telephone network operates as a continuous channel between two terminals, wave cancellation (or dropping part of the conversation) is not a problem. In fact, because of the large coverage of telephone networks, they use multiple technologies to achieve high efficiency.
The telephone network takes advantage of this phenomenon, and many conversations are actually silent. When people answer, they usually do not speak. This valuable channel capacity can be used anywhere. The synthesized mute is inserted here, and the real mute is instantly replaced by another channel session. With thousands of instantaneous sessions being processed on the order of milliseconds, the network can borrow enough silence to carry twice as many sessions on the same cable, which can reduce costs when providing services.
Remember, wave cancellation can occur for many reasons, such as network failures, half-duplex loudspeakers, packet loss and jitter, and buffer up / down overflow. In view of this, only loudspeakers certified by the manufacturer and conforming to IEEE 1329 level 1 full-duplex system have good wave-free effect. Not only is it a terminal device, but both terminal devices must be full-duplex systems.
There are some other ways to reduce the wave cancellation, but the start of the processing program must ensure that the phone faithfully complies with the IEEE 1329 level 1 system, and then correct other problems.
Conclusion Imagine if the Internet as we know it today is a proprietary technology? There will be many competitors providing similar technologies. To meet the popularity of the Internet and serious interconnection problems, it will cause confusion caused by too many products. However, there are many such examples. Many companies develop and sell proprietary solutions for patents. This is an expensive "gambling" and is also the wrong way to have technology, which everyone wants to use. It is really good to develop products according to a standard, because customers can choose the best solution without having to be forced to choose because of the existence of similar technologies.
It is very important to negotiate with product suppliers that are indispensable in the conference field, to ensure that the products meet the corresponding standards, and customers can get some basic concepts when deploying solutions.
Understandably, not all customers care about the "back-end" details of their solutions. Successfully deploying conference solutions is to make customers completely satisfied, and not to blame system integrators for problems when deploying inferior or non-standard products .
Patented proprietary solutions have led to long-term high investment by customers, and this situation must stop. Meeting and collaboration facilities need to find a connection point, and standards are unifying the connection points of these infrastructures. This demand is greater than ever. A predictable trend shows that more and more customers are changing from using proprietary products to using open standards.
When a converged collaboration solution is not yet a catchy word, it has an impact on companies that are eager to integrate applications into the same network, and makes their facilities interconnected. Communication standards, media protocols, multi-layer routing and switching networks are converging into one point to achieve unified collaboration. Whether it is the products of Avaya, Cisco, Juniper, Nortel, or the customer backbone network formed by the combination of these products, open standards make application convergence and unified collaborative communication come together.
This is the main reason why open standards are important in the video conferencing market. Imagine what happens if there is no standard in the field of video conferencing? It will form a chaotic chaos, a large and powerful company is enough to overwhelm opponents, and inhibit the emergence of competition.
More importantly, these standards make it easier for customers to choose solutions, and have the ability to select products according to common standards, rather than hovering around a limited number of suppliers. Choosing products whose standards are not approved must bear the risk that these standards will be abandoned due to the popularization of other technologies.
Let ’s take a look at some of the standards that are critical in the field of video conferencing and how they are driving the application of collaboration solutions in today ’s communications era.
1. H.323 and SIP
H.323 is a ITU standard that provides a full set of subsets for call setup, control, and payload. The standard is more mature and defines how to be compatible with the previous circuit-switched H.320 standard. On the other hand, Session Initiation Protocol (SIP) is a newly emerging standard defined by IETC. It is designed to provide call settings and control for voice, video and other multimedia applications.
Since SIP is only responsible for providing session connection and session management, and has nothing to do with applications, SIP can be used in multiple fields. Currently, SIP is bringing the most extensive interconnection to the conference market.
The freedom provided by these standards enables customers who use video conferencing products and solutions to make the best choices to meet their needs. From time division multiplexing (TDM) to H.323 or SIP has become a natural evolution, although the two themselves are not mutually exclusive.
Today, SIP IP phones, group video conferencing systems, audio conferencing media servers for service providers, and multipoint control units for audio and video conferencing that are compatible with both H.323 and SIP are available everywhere on the market. SIP's support for video conferencing services is currently in the "pre-standard" phase, so existing products can be tested on-site and interconnected.
H.323 and SIP have some of the same problems in security, network address translation (NAT) and traditional firewalls, so when deploying H.323 and SIP-based video conferencing, VPN can provide a solution for network administrators.
2. H.239
According to ITU-T recommendations, H.239 is an international standard for using, controlling, and labeling two simultaneous video channels in a video conference. The H.239 approved by the ITU in July 2003 allows systems from multiple vendors to work collaboratively on ISDN (H.320) and IP (H.323) networks.
Although some existing standards such as H.323 have always supported multiple video channels, H.239 adds the important ability to "tag" each channel task in the conference. In H.329, each video channel gets a "task label", which indicates the purpose of the channel and how each channel is presented to the audience.
3. H.264
As the latest video compression industry standard, H.264 enables video conferencing users to experience significantly improved video quality at the same rate, or to achieve current video quality at almost half the rate of the past. For example, users are accustomed to 768kbit / s high-quality video obtained under H.263 encoding, which can be obtained at a rate of 384kbit / s on H.264.
4. H.235 v3
Because of the numerous security risks like viruses and hacking attacks, network administrators do not want to compromise the integrity of the corporate network, and are reluctant to configure IP-based audio and video applications (the latter is just like computer networks for uninvited guests Viruses and hacking attacks). The H.235 v3 standard approved by the ITU in June 2003 describes how to use the "Advanced Encryption Standard 1 (AES)" video conferencing system to combine security service authentication and call privacy, and provide some improvements: such as security documents (simple Passwords and complex digital signatures), new security countermeasures and reverse service support, etc.
5. IEEE 1329 Level 1
Finally, the standard that does not involve the audio conference part is imperfect, because it is generally believed that when the telephone network operates as a continuous channel between two terminals, wave cancellation (or dropping part of the conversation) is not a problem. In fact, because of the large coverage of telephone networks, they use multiple technologies to achieve high efficiency.
The telephone network takes advantage of this phenomenon, and many conversations are actually silent. When people answer, they usually do not speak. This valuable channel capacity can be used anywhere. The synthesized mute is inserted here, and the real mute is instantly replaced by another channel session. With thousands of instantaneous sessions being processed on the order of milliseconds, the network can borrow enough silence to carry twice as many sessions on the same cable, which can reduce costs when providing services.
Remember, wave cancellation can occur for many reasons, such as network failures, half-duplex loudspeakers, packet loss and jitter, and buffer up / down overflow. In view of this, only loudspeakers certified by the manufacturer and conforming to IEEE 1329 level 1 full-duplex system have good wave-free effect. Not only is it a terminal device, but both terminal devices must be full-duplex systems.
There are some other ways to reduce the wave cancellation, but the start of the processing program must ensure that the phone faithfully complies with the IEEE 1329 level 1 system, and then correct other problems.
Conclusion Imagine if the Internet as we know it today is a proprietary technology? There will be many competitors providing similar technologies. To meet the popularity of the Internet and serious interconnection problems, it will cause confusion caused by too many products. However, there are many such examples. Many companies develop and sell proprietary solutions for patents. This is an expensive "gambling" and is also the wrong way to have technology, which everyone wants to use. It is really good to develop products according to a standard, because customers can choose the best solution without having to be forced to choose because of the existence of similar technologies.
It is very important to negotiate with product suppliers that are indispensable in the conference field, to ensure that the products meet the corresponding standards, and customers can get some basic concepts when deploying solutions.
Understandably, not all customers care about the "back-end" details of their solutions. Successfully deploying conference solutions is to make customers completely satisfied, and not to blame system integrators for problems when deploying inferior or non-standard products .
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