ZyXEL Communications P-660H-T Series User Manual

P-660H/HW-T Series User’ Guide

Chapter 16 Media Bandwidth Management Advanced Setup

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This chapter describes bandwidth management with one level of child class.

Bandwidth management allows you to allocate an interface’s outgoing capacity to specific 
types of traffic. It can also help you make sure that the Prestige forwards certain types of 
traffic (especially real-time applications) with minimum delay. With the use of real-time 
applications such as Voice-over-IP (VoIP) increasing, the requirement for bandwidth 
allocation is also increasing. 

Bandwidth management addresses questions such as:

• Who gets how much access to specific applications?
• What priority level should you give to each type of traffic?
• Which traffic must have guaranteed delivery?
• How much bandwidth should be allotted to guarantee delivery?

Bandwidth management also allows you to configure the allowed output for an interface to 
match what the network can handle. This helps reduce delays and dropped packets at the next 
routing device. For example, you can set the WAN interface speed to 1000kbps if the ADSL 
connection has an upstream speed of 1Mbps. All configuration screens display measurements 
in kbps (kilobits per second), but this User’s Guide also uses Mbps (megabits per second) for 
brevity’s sake.

 to enable and configure bandwidth on the interfaces. 

 to configure bandwidth classes. 

 to view bandwidth usage information. 

Use bandwidth classes and child-classes to allocate specific amounts of bandwidth capacity 
(bandwidth budgets). Configure a bandwidth filter to define a bandwidth class (or child-class) 
based on a specific application and/or subnet. Use the Class Configuration screen (see 

) to set up a bandwidth class’s name, bandwidth allotment, and