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Latest Posts
Single Pipe Future
Posted on 27/09/2007 @ 11:35 AM
The single pipe idea was used as a sales pitch to sell more bandwidth than a company really needed. Now users are asking for them. It’s seen as the natural progression. Everyone is being sold services over IP, these services all generally being delivered over the internet. So it seems reasonable for a company to want to use it's one pipe for everything.
So what’s the catch? The real issue is the mixing of traffic. Data and voice don’t mix that well. The problem is the length of the data packets. Compared to voice, data packets are huge. They just get in the way of voice and cause the dreaded jitter and choppy voice quality. This problem happens just before the data and voice packets leave the customer's site, the DSL router is the main bottle neck.
It’s not that difficult to sort out these issues. The better Cisco SoHo routers have the two mechanisms needed to mix and match data and voice. The first, Link Fragmentation & Interleaving (LFI), solves the major problem when transmitting the data packets. The data packets are that large that serialising them (putting them on the wire to send) takes a lot longer than any of the voice packets can wait. LFI chops up all the packets to a similar size, so the voice packets have a constant time to wait and in a time window which doesn’t cause them to wait too long.
The second, Priority Queuing (PQ), is part of QoS. This just puts all voice packets at the beginning of the queue, before any waiting data packets.
These mechanisms obviously have benefits for all types of services, not just voice, but they will have the most impact on slower links mixing heavy data applications or VPNs with voice.
Single pipes are being used more and more, and although their use tends to be on smaller sites with less infrastructure, it is the beginning of a trend which will become more common.
VoiceFlex has a single pipe product named MxDSL. This is a combination of business grade DSL with a Cisco router setup with the mechanisms described above. This product is currently going through successful beta trials and will soon be on full release.
About VoiceFlex
VoiceFlex, a division of Frontier Systems, was established to provide advanced IP telephony (VoIP) services for UK businesses. Bringing the reliability of the Internet to the telephone, VoiceFlex is an advocate of SIP (Session Initiation Protocol) - the latest technology allowing voice calls to be made over the Internet. VoiceFlex uses its own SIP technology offering developed completely in-house, to provide low cost, ISDN replacement lines that provide the best possible call quality, inexpensively with the flexibility that comes from using the Internet. VoiceFlex can also port any telephone number regardless of geographic location. Products include SIP Trunks and SIP Centrex.
VoiceFlex offices are based in Piccadilly and Coventry. For further information, please visit: www.voiceflex.com or contact Paul Taylor on 0207 440 1811 or email ptaylor@voiceflex.com
If you require more information, please contact Paul Taylor on 020 3004 1990 or email ptaylor@voiceflex.com
www.voiceflex.com
So what’s the catch? The real issue is the mixing of traffic. Data and voice don’t mix that well. The problem is the length of the data packets. Compared to voice, data packets are huge. They just get in the way of voice and cause the dreaded jitter and choppy voice quality. This problem happens just before the data and voice packets leave the customer's site, the DSL router is the main bottle neck.
It’s not that difficult to sort out these issues. The better Cisco SoHo routers have the two mechanisms needed to mix and match data and voice. The first, Link Fragmentation & Interleaving (LFI), solves the major problem when transmitting the data packets. The data packets are that large that serialising them (putting them on the wire to send) takes a lot longer than any of the voice packets can wait. LFI chops up all the packets to a similar size, so the voice packets have a constant time to wait and in a time window which doesn’t cause them to wait too long.
The second, Priority Queuing (PQ), is part of QoS. This just puts all voice packets at the beginning of the queue, before any waiting data packets.
These mechanisms obviously have benefits for all types of services, not just voice, but they will have the most impact on slower links mixing heavy data applications or VPNs with voice.
Single pipes are being used more and more, and although their use tends to be on smaller sites with less infrastructure, it is the beginning of a trend which will become more common.
VoiceFlex has a single pipe product named MxDSL. This is a combination of business grade DSL with a Cisco router setup with the mechanisms described above. This product is currently going through successful beta trials and will soon be on full release.
About VoiceFlex
VoiceFlex, a division of Frontier Systems, was established to provide advanced IP telephony (VoIP) services for UK businesses. Bringing the reliability of the Internet to the telephone, VoiceFlex is an advocate of SIP (Session Initiation Protocol) - the latest technology allowing voice calls to be made over the Internet. VoiceFlex uses its own SIP technology offering developed completely in-house, to provide low cost, ISDN replacement lines that provide the best possible call quality, inexpensively with the flexibility that comes from using the Internet. VoiceFlex can also port any telephone number regardless of geographic location. Products include SIP Trunks and SIP Centrex.
VoiceFlex offices are based in Piccadilly and Coventry. For further information, please visit: www.voiceflex.com or contact Paul Taylor on 0207 440 1811 or email ptaylor@voiceflex.com
If you require more information, please contact Paul Taylor on 020 3004 1990 or email ptaylor@voiceflex.com
www.voiceflex.com
