ZyXEL Communications SAM1316-22, Руководство пользователя

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Chapter 18 IGMP
SAM1316-22 User’s Guide
149
18.7 IGMP Count Screen
Use this screen to limit the number of IGMP groups a subscriber on a port can join.
This allows you to control the distribution of multicast services (such as content
information distribution) based on service plans and types of subscription.
IGMP count is useful for ensuring the service quality of high bandwidth services
like video or Internet Protocol television (IPTV). IGMP count can limit how many
channels (IGMP groups) the subscriber connected to a DSL port can use at a time.
If each channel requires 4~5 Mbps of download bandwidth, and the subscriber’s
connection supports 11 Mbps, you can use IGMP count to limit the subscriber to
using just 2 channels at a time. This also effectively limits the subscriber to using
only two IPTVs with the DSL connection.
To open this screen, click Advanced Application, IGMP, Count Setup.
Figure 72 IGMP Count
The following table describes the labels in this screen.
Table 40 IGMP Count
LABEL DESCRIPTION
IGMP Status Click IGMP Status to open the IGMP Setup screen where you can
view current IGMP information (see
Section 18.3 on page 143 ).
Port This field shows each DSL port number.
Active This field shows whether or not the IGMP count limit is enabled on
this port. “V” displays if it is enabled and “-“ displays if it is disabled.
Count Enter the maximum number of IGMP groups a subscriber on this port
can join. This has no effect if the IGMP count limit is disabled.
Select Select this, and click Active or Inactive to enable or disable the
specified IGMP count limit on this port.
Active Click this to enable the specified IGMP count limits on the selected
ports.
Inactive Click this to disable the specified IGMP count limits on the selected
ports.