Voip Accelerators For Wlan
Accelerator products can help enterprises a lot in addressing the performance requirements of all enterprise applications including voip. First, Accelerators change the economics of wide area networking by squeezing an average of 100% - 400% more bandwidth with peaks of 1000% depending on traffic mix. This frees up link bandwidth to support high quality voice over IP service - and it does it without expensive WAN upgrades.
It is also worthy to note that Accelerators do not actually use lossy compression schemes that might degrade voice quality and they add less than one millisecond of latency. In fact, the Accelerator’s compression actually reduces end-to-end latency by reducing serialization delays on WAN links. For example, it takes 125 ms to serialize a 1,000 byte packet on a 64 kbps link, but if an Accelerator increases the effective bandwidth by 4X to 256 kbps, the serialization delay is reduced by a factor of four to 31 ms. The following formula can be used to calculate the serialization delay for any combination of packet size and link speed:
Packet Size (in bytes) x 8 / Speed (in kbps) = Serialization Delay (in ms)
In addition to freeing up the bandwidth normally consumed by data applications, Accelerators are able to reduce WAN bandwidth requirements for different voip codecs. In fact, tests have shown that Accelerators reduced G.711 bandwidth requirements by 20% and G.729 by 70%. As a result, WAN links can carry more simultaneous voice calls and the performance of other applications may also be improved.
Accelerators solve increased jitter and latency caused by large data packets over slow WAN links by fragmenting large data packets and injecting voip packets at regular intervals. This feature allows voip and data to co-exist even on branch office WAN links. For example, normally, a voip packet “stuck” behind a 1,500 byte packet on a 64kbps lin will be delayed by 188ms.
Using the Accelerator’s packet fragmentation will result in the data packet being reduced in size (accelerated - say from 1500 bytes to 500b bytes) and then fragmented into smaller data packets (say - 2 packets of 250 bytes each). In this case, the latency for the voip packet will go down from 188 ms to 31ms! In addition to increasing WAN capacity for both data and voip while reducing latency and jitter, Accelerators also manage WAN bandwidth to ensure that critical applications like voip get the bandwidth they need.
Accelerators include an Instant QoS feature that prioritizes application access to WAN bandwidth. Without such priorization, the additional effective bandwidth provided by Accelerators could be consumed by aggressive, non-critical applications such as file sharing. Accelerator’s AppView feature provides graphical visibility for all application traffic sharing a link. AppView can be used to monitor WAN utilization and to plan future capacity requirements.
And finally, ip accelerators have a set of data integrity features that are designed to stop the packet loss that can degrade voice quality. A flow control mechanism reduces packet loss caused by link congestion and a packet recovery feature ensures that any lost packets are transparently recovered at the link level before they can cause voice quality problems.
Jim Francisto
Voip Solutions - Which To Choose?
Voip devices are available from many companies and range from simple vop phones to complex routers and controllers. VoIP is not really a new concept and is now available on the market for many years, it’s no more in testing mode. People don’t know that much about a Voip solutions. What are they, how do they work? Here is some information that can help.
Voip solutions can be classified in three general categories:
<ul> <li>end stations (such as phones), </li> <li>and controllers.</li> <li>gateways and routers, </li> </ul>
Like everything else in the IT domain, every category has a specific function that it performs. And if you combine all the functions you will get a complete VoIP system.
VoIP controllers
VoIP controllers, also called IP PBXs, manage the VoIP network. IP PBX controllers are PC-based, running a standard OS (such as Microsoft Windows, Linux or Sun Solaris, but very different) with additional software to control the VoIP systems. Plus they are performing all the functions of a traditional PBX. These systems can provide APIs to extend vendor-provided or user-written features and functionality.
Hardware and software vop phones
There are two types of vop phones: hardware and software.
<ul> <li> A hardware phone is a physical device, very similar to your common phone; it has a handset, dialpad, etc. The only thing that is different from your ordinary phone is that it connects to an Ethernet network rather than a telephone network. vop phones are built with all the necessary hardware (and software) to digitize your voice (i.e., codecs) as well as setup and make calls (i.e., signaling and transport). <li> Software-only phones, or “soft” phones, use the PC’s capabilities to communicate with other PC’s over the Internet, by using the PC’s sound card, CPU and network card as part of the phone’s hardware, and thus, enable a PC to become an IP phone. </ul>
VoIP gateway
With so many options available today, gateways are also capable of transcoding (changing the signal from one codec version to another so that the voip device can communicate with the rest of the network). A VoIP gateway is a voip device that connects the VoIP network to your public telephone network (PSTN). For example, a gateway uses G.729 codec, while your PTSN network uses a G.711 codec.
VoIP Routers
Routers are inter-network equipments that help a LAN connect to a WAN; therefore the router’s capability to ensure correctly handled high-priority traffic is very important. Since WAN speeds have generally less bandwidth than a LAN, proper packet queuing and priorization is in order to ensure good voice quality across the path.
Jim Francisto
reverse lookup cell phones
What is VoIP?
You are still probably not completely aware of, but the word VoIP is one that may already be familiar to you.
VoIP, is the one type of technology that everyone should be aware of today. VoIP, or Voice over Internet Protocol, is simply the transmission of voice traffic over IP-based networks. The use of VoIP has become extremely popular, especially over the past couple of years, and this is largely due to the fact that there are many cost advantages to consumers over traditional telephone networks.
VoIP can help you to save money, and everyone nowadays is looking to save money. Most Americans pay a flat monthly fee for local telephone calls and a per-minute charge for any long-distance calls. However, with the use of a VoIP phone call, it can be placed across the Internet, completely free of charge, but for paying the cost of your internet bill of course.
Types of Calls
There are actually a few different types of calls that can be made here. These telephone calls can either be placed to other VoIP devices, or to normal telephones on the PSTN. There are three methods that you can use to connect to a VoIP network and this makes it incredibly easy and convenient to get started if you want to make the switch: using a VoIP telephone, using a normal telephone with a VoIP adapter, and using a computer with speakers and a microphone.
There are several terrific options available to you here if you are interested in learning more about this before making the switch. Read some of the many different books that are available on the subject is the best idea before making the switch.
You will be able to find all the equipment that you would need to make the switch online, and the internet is also a great resource for learning about this service and all the advantages that it has to offer.
Just make sure that you are aware of all the benefits that this service has to offer before going through with it and making the switch, because you want to ensure that you are aware of all you going to be getting in return.
As more and more people are learning more about it and understanding all the benefits it has to offer, VoIP is definitely an awesome service that is worth checking out, and which continues to gain in popularity.
What is VoIP? This is definitely an excellent service that is worth looking into, and which continues to gain in popularity. To browse more articles on VoIP please visit, http://www.voip.jsgenterprises.com.
