ZyXEL Communications P-870HW-I User Manual

P-870HW-I1 User’s Guide

Chapter 15 Bandwidth MGMT

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You can set the bandwidth management speed for an interface higher than the interface’s 
actual transmission speed. Higher priority traffic gets to use up to its allocated bandwidth, 
even if it takes up all of the interface’s available bandwidth. This could stop lower priority 
traffic from being sent. The following is an example.

If you use VoIP and NetMeeting at the same time, the device allocates up to 500 Kbps of 
bandwidth to each of them before it allocates any bandwidth to FTP. As a result, FTP can only 
use bandwidth when VoIP and NetMeeting do not use all of their allocated bandwidth.

Suppose you try to browse the web too. In this case, VoIP, NetMeeting and FTP all have 
higher priority, so they get to use the bandwidth first. You can only browse the web when 
VoIP, NetMeeting, and FTP do not use all 1000 Kbps of available bandwidth.

Use this screen to enable bandwidth management and set the maximum allowed bandwidth for 
the WAN port. You can also set some basic settings for each rule. To open this screen, click 
Management > Bandwidth MGMT > Configuration.

Table 89   Over Allotment of Bandwidth Example

Actual outgoing bandwidth available on the interface: 1000 kbps

Root Class: 1500 kbps  (same 

as Speed setting)

VoIP traffic (Service = SIP): 500 Kbps

High

NetMeeting traffic (Service = H.323): 500 kbps

High

FTP (Service = FTP): 500 Kbps

Medium