May 2010 Archives

Designing resilience into next-generation public safety communications

May 24, 2010 6:21 AM | 0 Comments
The team here at Aculab are gearing up for NENA 2010, which takes place in Indianapolis, USA in early June. NENA 2010 is an event run by the National Emergency Number Association (NENA) for public safety professionals, telecoms specialists and government officials, which focuses on the near and long term issues facing public safety in the USA.

NENA is calling for the migration of 911 networks to next generation E911. The idea is to move 911 systems to standards-based IP platforms and, in the process, enable citizens and those involved in emergency response to interact not only in voice, but also via text, IM and possibly even video communications.

The ultimate goal is that citizens, no matter who they are, where they are or which communications device they use, can make an emergency call and the emergency services will have the accurate location and subscriber information to find them.
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Achieving 'five-9s' reliability in IP-based communications networks

May 7, 2010 11:00 AM | 0 Comments
Is the lack of widespread support for full 'five-9's' reliability in IP-based networks  holding back the adoption of IP communications?

It is certainly something we thought might be the case, and so we set our engineers the task of providing redundancy mechanisms for IP communications , based on Aculab's SIP stack, that would enable end customers to build in the reliability they were craving.

Our goal was to enable our customers to build enterprise and service provider communications platforms that could match the reliability and resilience of a legacy TDM-based system, but also give the full unified communications experience made possible by IP.
99_999% image.PNG
For over 30 years, designers of TDM networks have taken every step possible to minimise network downtime in search of the mythical 99.999% availability figure (just over 5 minutes downtime per year). The basic rule has been to eliminate any single point of failure. This philosophy has extended beyond simply duplicating the network hardware - separate buildings with separate power feeds and physical connecting cables are also a key part of a resilient network design.

For the IP-core network consisting of routers that are inherently designed to utilise multiple routing paths, this is not an issue; but for hardware attached at the network edge such as media processing servers, it is not so straightforward. An IP-based media server supporting VoIP and video services and using SIP for its signalling is one such platform that sits at the edge of the service delivery network.
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Telecoms standards: are they slipping?

May 5, 2010 12:06 PM | 0 Comments
I often hear people say things like, "standards are slipping" - maybe they are talking about our politicians! But that's not where I'm going today; I just had a few random thoughts on standards, per this definition: 

•         standard (n): a specification for hardware or software that is both widely used and accepted (de facto) or is sanctioned by a standards organisation (de jure)

We're all familiar with the British Standards' kite mark and the American National Standards Institute (ANSI). Internationally, there is the Internet Engineering Task Force (IETF - maybe you could quibble on that one as its RFCs are more akin to recommendations; but let's not deviate from our standard interpretation), the International Telecommunications Union (ITU-T) or the 3rd Generation Partnership Project (3GPP) or...

Never mind that the list of standards bodies goes on and on, my first thought was, "Isn't it maddening that their collected output is seemingly endless?" The standard response is "yes", by the way.

Don't get me wrong, it's certainly a good idea that the graphics card you buy to upgrade your computer is built to the PCI electro-mechanical standard. You want it to slot in snugly, regardless of whether you bought it on eBay or from your local RadioShack. Continue Reading...
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