ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 201)

Chapter 17 Bandwidth Management

NBG420N User’s Guide

201

17.6 Predefined Bandwidth Management Services

The following is a description of the services that you can select and to which you can apply

media bandwidth management using the wizard screens.

17.6.1 Services and Port Numbers

See Appendix F on page 321 for commonly used services and port numbers.

Mid Typically used for “excellent effort” or better than best effort and would include

important business traffic that can tolerate some delay.

Low This is typically used for non-critical “background” traffic such as bulk

transfers that are allowed but that should not affect other applications and

users.

Table 72 Bandwidth Management Priorities

PRIORITY LEVELS: TRAFFIC WITH A HIGHER PRIORITY GETS THROUGH FASTER WHILE

TRAFFIC WITH A LOWER PRIORITY IS DROPPED IF THE NETWORK IS CONGESTED.

Table 73 Media Bandwidth Management Setup: Services

SERVICE DESCRIPTION

Xbox Live This is Microsoft’s online gaming service that lets you play multiplayer Xbox

games on the Internet via broadband technology. Xbox Live uses port 3074.

VoIP (SIP) Sending voice signals over the Internet is called Voice over IP or VoIP. Session

Initiated Protocol (SIP) is an internationally recognized standard for implementing

VoIP. SIP is an application-layer control (signaling) protocol that handles the

setting up, altering and tearing down of voice and multimedia sessions over the

Internet.

SIP is transported primarily over UDP but can also be transported over TCP, using

the default port number 5060.

FTP File Transfer Program enables fast transfer of files, including large files that may

not be possible by e-mail. FTP uses port number 21.

E-Mail Electronic mail consists of messages sent through a computer network to specific

groups or individuals. Here are some default ports for e-mail:

POP3 - port 110

IMAP - port 143

SMTP - port 25

HTTP - port 80

BitTorrent BitTorrent is a free P2P (peer-to-peer) sharing tool allowing you to distribute large

software and media files using ports 6881 to 6889. BitTorrent requires you to

search for a file with a searching engine yourself. It distributes files by corporation

and trading, that is, the client downloads the file in small pieces and share the

pieces with other peers to get other half of the file.

MSN Webcam MSN messenger allows you to chat online and send instant messages. If you use

MSN messenger and also have a webcam, you can send your image/photo in

real-time along with messages

WWW The World Wide Web (WWW) is an Internet system to distribute graphical, hyper-

linked information, based on Hyper Text Transfer Protocol (HTTP) - a client/server

protocol for the World Wide Web. The Web is not synonymous with the Internet;

rather, it is just one service on the Internet. Other services on the Internet include

Internet Relay Chat and Newsgroups. The Web is accessed through use of a

browser.

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