P-334U/P-335U User’s Guide

15.5 Bandwidth Management Priorities

The following table describes the priorities that you can apply to traffic that the ZyXEL Device forwards out through an interface.

Table 62 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.

High

Typically used for voice traffic or video that is especially sensitive to jitter (jitter

 

is the variations in delay).

 

 

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.

15.6 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.

Table 63 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

 

 

eMule

These programs use advanced file sharing applications relying on central servers

 

to search for files. They use default port 4662.

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.

Chapter 15 Bandwidth Management

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