General FAQ


  1. How can I manage Prestige 660?
  2. What is the default user name and password to loging web configurator?
  3. What is the microfilter or splitter used for?
  4. What is Traffic Shaping?
  5. What do the parameters (PCR, SCR, MBS) mean?
  6. Why do we perform traffic shaping in the Prestige 660?

1. How can I manage Prestige 660?

2. What is the default user name and password to loging web configurator?

The default password is '1234'. You can change the password by command: sys password xxxxxx (your password).

Please record your new password whenever you change it. The system will lock you out if you have forgotten your password.

3. What is the microfilter or sipltter used for?

Generally, the voice band uses the lower frequency ranging from 0 to 4KHz, while ADSL data transmission uses the higher frequency. The microfilter acts as a low-pass filter for your telephone set to ensure that ADSL transmissions do not interfere with your voice transmissions. For the details about how to connect the microfilter please refer to the user's manual.

4. What is Traffic Shaping?

Traffic Shaping is a feature in the Prestige. It allocates the bandwidth to WAN dynamically and aims at boosting the efficiency of the bandwidth. If there are serveral VCs in the Prestige but only one VC activated at one time, the Prestige allocates all the Bandwidth to the VC and the VC gets full bandwidth. If another VCs are avtivated later, the bandwidth is yield to other VCs after ward.

5. What do the  parameters (PCR, SCR, MBS) mean?

Traffic shaping parameters (PCR, SCR, MBS) can be set in Menu 4 and Menu 11.6 and is valid for both incoming and outgoing direction since G.shdsl is symmetric.
Peak Cell Rate(PCR):  The maximum bandwidth allocated to this connection. The VC connection throughput is limited by PCR.
Sustainable Cell Rate(SCR):  The least guaranteed bandwidth of a VC. When there are multi-VCs on the same line, the VC throughput is guaranteed by SCR.
Maximum Burst Size(MBS):  The amount of cells transmitted through this VC at the Peak Cell Rate before yielding to other VCs. Total bandwidth of the line is dedicated to single VC if there is only one VC on the line. However, as the other VC asking the bandwidth, the MBS defines the maximum number of cells transmitted via this VC with Peak Cell rate before yielding to other VCs.

The Prestige 660 holds the parameters for shaping the traffic among its virtual channels. If you do not need traffic shaping, please set SCR = 0, MBS = 0 and PCR as the maximum value according to the line rate (for example, 2.3 Mbps line rate will result PCR as 5424 cell/sec.)

6.Why do we perform traffic shaping in the Prestige 660?

The Prestige 660 must manage traffic fairly and provide bandwidth allocation for different sorts of applications, such as voice, video, and data. All applications have their own natural bit rate. Large data transactions have a fluctuating natural bit rate. The Prestige 660 is able to support variable traffic among different virtual connections. Certain traffic may be discard if the virtual connection experiences congestion. Traffic shaping defines a set of actions taken by the Prestige 660 to avoid congestion; traffic shaping takes measures to adapt to unpredictable fluctuations in traffic flows and other problems among virtual connections.

 


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