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IPTV Analysis

VDSL2, ADSL2+, and IP Triple-Play Test Set 67

Reading Results

IGMP Monitor

The IGMP Monitor tab allows you to confirm that IGMP traffic is being

transferred between the central network and STB, and view the statistics.

The available statistics are the

following:

³ Queries counts the number of

IGMP queries issued by the

network.

³ Join Request is the number of

unsolicited IGMP “joins” issued by

the STB or the user.

³ Leave Request is the number of IGMP “leaves” issued by the STB or

the user.

³ Last Request displays the multicast addresses for Join/Leave

channels.

³ zap time(ms) is the time required for a channel change or join, and is

one of the key factors to be considered when evaluating the IPTV

quality of service (QoS).

To start/stop reporting:

1. To have the STB send an IGMP report with the multicast IP address,

press Join.

2. To inform the network to stop sending the current stream, press Leave.

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Exfo VDSL2 Manual do Utilizador Página 73