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Nikkei Network

December 2006 Issue

FEATURE 1 Optical phone troubles could happen to you The Dangers of IP Phones There has been a stream of trouble with IP phone services. There are probably a lot of users who are asking themselves whether IP phones are that fragile. Are they really? This feature will take a close look at the weak points of IP phones as well as server countermeasures to deal with these weaknesses. The knowledge to use IP phones safely should be helpful to both corporate users that are planning to introduce IP phone systems and to users of IP phone services. Part 1 - Digging for the weak points The pitfalls lurking behind the move to IP Be careful of servers overloaded with functions Part 2- Dealing with the weak points Dividing up the network and making pivotal points redundant Determining the important points and protecting them

BEGINNERS’ QUESTION

Who owns GPS?
How much does it cost to use it?

FEATURE 2

What Is NGN?

Next-Generation Networks

A keyword that has recently been very much in vogue in the communications industry is NGN. It became a hot topic when NTT unveiled its field trial interface in July 2006. NGN is often described as a “communications operator’s next-generation IP network,” but there still seem to be a lot of people out there who don't understand what it’s all about. This feature looks at this mysterious creation by asking 12 questions. Let’s find out what NGN really is.


Q1 Why are people making such a big deal out of NGN?
Q2 What is the substance of it in a nutshell?
Q3 Does NGN refer only to phones?
Q4 Does it mean that the Internet will disappear eventually?
Q5 What are field trials?
Q6 What is NTT’s NGN all about?
Q7 Are the specifications already completed?
Q8 What kind of equipment will it use?
Q9 What about full-scale NGN construction in the future?
Q10 How important is SIP?
Q11 What is multicasting?
Q12 What kind of transmission technology is used with NGN?