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P-334U/P-335U User’s Guide
Chapter 15 Bandwidth Management 175
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.