ZyXEL Communications Corporation EMG2881-T20A Manuel D’Utilisation
Chapter 9 Applications
EMG2881-T20A User’s Guide
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network. The PIR is greater than or equal to the CIR. CIR and PIR values are based on the guaranteed
and maximum bandwidth respectively as negotiated between a service provider and client.
and maximum bandwidth respectively as negotiated between a service provider and client.
The trTCM evaluates incoming packets and marks them with one of three colors which refer to packet
loss priority levels. High packet loss priority level is referred to as red, medium is referred to as yellow and
low is referred to as green.
loss priority levels. High packet loss priority level is referred to as red, medium is referred to as yellow and
low is referred to as green.
The trTCM is based on the token bucket filter and has two token buckets (Committed Burst Size (CBS)
and Peak Burst Size (PBS)). Tokens are generated and added into the two buckets at the CIR and PIR
respectively.
and Peak Burst Size (PBS)). Tokens are generated and added into the two buckets at the CIR and PIR
respectively.
All packets are evaluated against the PIR. If a packet exceeds the PIR it is marked red. Otherwise it is
evaluated against the CIR. If it exceeds the CIR then it is marked yellow. Finally, if it is below the CIR then
it is marked green.
evaluated against the CIR. If it exceeds the CIR then it is marked yellow. Finally, if it is below the CIR then
it is marked green.
The following shows how tokens work with incoming packets in trTCM:
• A packet arrives. If the number of tokens in the PBS bucket is less than the size of the packet (in bytes),
the packet is marked red and may be dropped regardless of the CBS bucket. No tokens are removed
if the packet is dropped.
if the packet is dropped.
• If the PBS bucket has enough tokens, the EMG2881-T20A checks the CBS bucket. The packet is
marked green and can be transmitted if the number of tokens in the CBS bucket is equal to or greater
than the size of the packet (in bytes). Otherwise, the packet is marked yellow.
9.7.1 Using UPnP in Windows XP Example
This section shows you how to use the UPnP feature in Windows XP. You must already have UPnP installed
in Windows XP and UPnP activated on the EMG2881-T20A.
in Windows XP and UPnP activated on the EMG2881-T20A.
Make sure the computer is connected to a LAN port of the EMG2881-T20A. Turn on your computer and
the EMG2881-T20A.
the EMG2881-T20A.
9.7.1.1 Auto-discover Your UPnP-enabled Network Device
1
Click start and Control Panel. Double-click Network Connections. An icon displays under Internet
Gateway.
Gateway.
2
Right-click the icon and select Properties.
Figure 47 Network Connections
Figure 47 Network Connections