Chapter 7 WAN Setup
P-660W-Tx v2 User’s Guide
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Do not specify a nailed-up connection unless your telephone company offers flat-rate service
or you need a constant connection and the cost is of no concern.
7.5.6 Traffic Shaping
Traffic Shaping is an agreement between the carrier and the subscriber to regulate the average
rate and fluctuations of data transmission over an ATM network. This agreement helps
eliminate congestion, which is important for transmission of real time data such as audio and
video connections.
Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This parameter
may be lower (but not higher) than the maximum line speed. 1 ATM cell is 53 bytes (424 bits),
so a maximum speed of 832Kbps gives a maximum PCR of 1962 cells/sec. This rate is not
guaranteed because it is dependent on the line speed.
Sustained Cell Rate (SCR) is the mean cell rate of each bursty traffic source. It specifies the
maximum average rate at which cells can be sent over the virtual connection. SCR may not be
greater than the PCR.
Maximum Burst Size (MBS) is the maximum number of cells that can be sent at the PCR.
After MBS is reached, cell rates fall below SCR until cell rate averages to the SCR again. At
this time, more cells (up to the MBS) can be sent at the PCR again.
If the PCR, SCR or MBS is set to the default of "0", the system will assign a maximum value
that correlates to your upstream line rate.
The following figure illustrates the relationship between PCR, SCR and MBS.
Figure 34
Example of Traffic Shaping
7.5.7 Zero Configuration Internet Access
Once you turn on and connect the ZyXEL Device to a telephone jack, it automatically detects
the Internet connection settings (such as the VCI/VPI numbers and the encapsulation method)
from the ISP and makes the necessary configuration changes. In cases where additional
account information (such as an Internet account user name and password) is required or the
ZyXEL Device cannot connect to the ISP, you will be redirected to web screen(s) for
information input or troubleshooting.
Zero configuration for Internet access is disabled when
• the ZyXEL Device is in bridge mode
Содержание P-660W-T1 v2
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Страница 8: ...Safety Warnings P 660W Tx v2 User s Guide 8 ...
Страница 10: ...Contents Overview P 660W Tx v2 User s Guide 10 ...
Страница 18: ...Table of Contents P 660W Tx v2 User s Guide 18 ...
Страница 22: ...List of Figures P 660W Tx v2 User s Guide 22 ...
Страница 25: ...25 PART I Introduction Introducing the ZyXEL Device 27 Introducing the Web Configurator 31 ...
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Страница 30: ...Chapter 1 Introducing the ZyXEL Device P 660W Tx v2 User s Guide 30 ...
Страница 36: ...Chapter 2 Introducing the Web Configurator P 660W Tx v2 User s Guide 36 ...
Страница 37: ...37 PART II Setup Wizard Connection Setup Wizard 39 Media Bandwidth Management Wizard 47 ...
Страница 38: ...38 ...
Страница 46: ...Chapter 3 Connection Setup Wizard P 660W Tx v2 User s Guide 46 ...
Страница 50: ...Chapter 4 Media Bandwidth Management Wizard P 660W Tx v2 User s Guide 50 ...
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Страница 83: ...Chapter 7 WAN Setup P 660W Tx v2 User s Guide 83 Figure 32 WAN Setup PPPoE ...
Страница 104: ...Chapter 8 Network Address Translation NAT Screens P 660W Tx v2 User s Guide 104 ...
Страница 130: ...Chapter 11 Firewall Configuration P 660W Tx v2 User s Guide 130 ...
Страница 156: ...Chapter 15 Logs Screens P 660W Tx v2 User s Guide 156 ...
Страница 169: ...169 PART IV Maintenance Maintenance 171 ...
Страница 170: ...170 ...
Страница 184: ...Chapter 17 Maintenance P 660W Tx v2 User s Guide 184 ...
Страница 185: ...185 PART V Troubleshooting and Specifications Troubleshooting 187 Product Specifications 193 ...
Страница 186: ...186 ...
Страница 192: ...Chapter 18 Troubleshooting P 660W Tx v2 User s Guide 192 ...
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Страница 208: ...Appendix A Pop up Windows JavaScripts and Java Permissions P 660W Tx v2 User s Guide 208 ...
Страница 226: ...Appendix C Common Services P 660W Tx v2 User s Guide 226 ...
Страница 232: ...Appendix D Legal Information P 660W Tx v2 User s Guide 232 ...
Страница 244: ...Index P 660W Tx v2 User s Guide 244 ...