ZyXEL p-334wh Guida Utente

P-334WH User’s Guide

Chapter 15 Bandwidth Management

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

Table 60   Bandwidth Management Priorities

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. 

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 61   Media Bandwidth Management Setup: Services 

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.