ZyXEL Communications P-660H-TX

P-660H-Tx v2 Support Notes

15. Why do we perform traffic shaping in the P-660H-Tx v2?

The P-660H-Tx v2 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 P-660H-Tx v2 is able to support variable traffic

among different virtual connections. Certain traffic may be discarded if the

virtual connection experiences congestion. Traffic shaping defines a set of

actions taken by the P-660H-Tx v2 to avoid congestion; traffic shaping takes

measures to adapt to unpredictable fluctuations in traffic flows and other

problems among virtual connections.

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

Traffic shaping parameters (PCR, SCR, MBS) can be set in Web Configurator,

Advanced Setup, Network -> Remote Node -> Edit -> ATM Setup:

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 P-660H-Tx v2 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.)

17. What do the ATM QoS Types (CBR, UBR, VBR-nRT, VBR-RT) mean?

Constant bit rate(CBR): An ATM bandwidth-allocation service that requires

the user to determine a fixed bandwidth requirement at the time the connection

is set up so that the data can be sent in a steady stream. CBR service is often

used when transmitting fixed-rate uncompressed video.

Unspecified bit rate(UBR): An ATM bandwidth-allocation service that does

not guarantee any throughput levels and uses only available bandwidth. UBR

is often used when transmitting data that can tolerate delays, such as e-mail.