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MP-20x Telephone Adapter 84 Document #: LTRT-50609
User's Manual
8.6 Class Statistics
MP-20x provides you with accurate, real-time information on the traf fi c passing through
your de fi ned device classes. For example, the amount of packets sent, dropped or
delayed, are just a few of the parameters that you can monitor per each shaping class.
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To view your class statistics:
„ From the sidebar menu, click the QoS menu link, and then click the Class Statistics
tab; the following screen opens:
Figure 8-11: QoS - Class Statistics
Note: Class statistics are only available after de fi ning at least one class (otherwise
the screen does not present any information).
8.7 Configuring Basic VoIP QoS
The 'Traffic Shaping' feature only ensures priority to calls that originate from inside MP-20x.
When giving VoIP priority over data, the bottleneck is effectively moved from the Cable /
ADSL modem into MP-20x. To give priority to calls from the LAN, you must define a traffic
priority rule (for SIP and RTP from the device on the LAN).
This section recommends a minimal QoS configuration that ensures sufficient QoS for
VoIP calls when MP-20x is connected behind a broadband (cable or DSL) modem with
limited uplink bandwidth and the user runs bandwidth-consuming applications on their PC.
Since most modems do not have any priority mechanisms, the Tx bandwidth of MP-20x
should be limited according to the modem’s uplink bandwidth. Since MP-20x automatically
gives higher priority to VoIP packets (in its internal queues), it is not necessary to define
traffic shaping classes.