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Nikkei Network

June 2006

FEATURE 1

How Much Do You Know about the “Mysteries” of Telephone Numbers?
Let’s look at how a telephone call is passed from one of Tokyo’s 23 wards to Noshiro City, Akita Prefecture

- How are telephone numbers assigned?

- What do phone numbers such as “0AB-J” and “0A0” indicate?

- Can the prefecture and the area in which a person is living be determined from his or her phone number?

- Why was the last digit of a long distance code moved to become the first digit of a local phone number?

- Is it true that a call between phone numbers with the same long distance code may not necessarily be a local call?

- Why can cell phones not access some of the “0120” toll-free numbers?

- How are phone numbers that begin with “#” or “*” used?  And what is the difference between the two?

- Is it true that you no longer have to dial “001” to make an international call?

- How is the telephone number that originates a call notified?

- Is it true that another phone number is assigned to numbers such as “115” and ones that begin with “0120”?

- How is a person able to use the same number after changing the company that provides her or his home telephone line?

- How does Mobile Number Portability work?

- How is someone able to access a cell phone by calling the same number from anywhere?

- How can someone receive cell phone calls using the same number even in other countries?


BEGINNERS’ QUESTIONS

Is it true that streaming images cannot be saved?


FEATURE 2

LAN Switch Technology That You Need to Learn 
A thorough understanding of “Spanning Tree”


- In order to ensure a highly reliable network, it is necessary to prevent MAC frames from moving around over a network and to allow communications to continue by providing another path if a failure occurs.  
One of the functions of a LAN switch, called “Spanning Tree,” is indispensable to implementing such measures.  
This article helps the reader understand that function, which should be regarded as an important LAN switch technology.


Part 1 - Meaning: What is Spanning Tree?  Where is it used and for what purpose?

Part 2 - Basics: The mechanism of detecting and removing loops by blocking traffic on ports

Part 3 - Progress: The latest technologies that have been developed through various innovations make Spanning Tree easier to use


 

Nikkei Network

June 2006

FEATURE 1

How Much Do You Know about the “Mysteries” of Telephone Numbers?
Let’s look at how a telephone call is passed from one of Tokyo’s 23 wards to Noshiro City, Akita Prefecture

- How are telephone numbers assigned?

- What do phone numbers such as “0AB-J” and “0A0” indicate?

- Can the prefecture and the area in which a person is living be determined from his or her phone number?

- Why was the last digit of a long distance code moved to become the first digit of a local phone number?

- Is it true that a call between phone numbers with the same long distance code may not necessarily be a local call?

- Why can cell phones not access some of the “0120” toll-free numbers?

- How are phone numbers that begin with “#” or “*” used?  And what is the difference between the two?

- Is it true that you no longer have to dial “001” to make an international call?

- How is the telephone number that originates a call notified?

- Is it true that another phone number is assigned to numbers such as “115” and ones that begin with “0120”?

- How is a person able to use the same number after changing the company that provides her or his home telephone line?

- How does Mobile Number Portability work?

- How is someone able to access a cell phone by calling the same number from anywhere?

- How can someone receive cell phone calls using the same number even in other countries?


BEGINNERS’ QUESTIONS

Is it true that streaming images cannot be saved?


FEATURE 2

LAN Switch Technology That You Need to Learn 
A thorough understanding of “Spanning Tree”


- In order to ensure a highly reliable network, it is necessary to prevent MAC frames from moving around over a network and to allow communications to continue by providing another path if a failure occurs.  
One of the functions of a LAN switch, called “Spanning Tree,” is indispensable to implementing such measures.  
This article helps the reader understand that function, which should be regarded as an important LAN switch technology.


Part 1 - Meaning: What is Spanning Tree?  Where is it used and for what purpose?

Part 2 - Basics: The mechanism of detecting and removing loops by blocking traffic on ports

Part 3 - Progress: The latest technologies that have been developed through various innovations make Spanning Tree easier to use