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Chapter 6 Broadband
VMG1312-B Series User’s Guide
102
Multiplexing
There are t wo convent ions t o ident ify what prot ocols t he virt ual circuit ( VC) is carrying. Be sure t o
use t he m ult iplexing m et hod required by your I SP.
VC- based Mult iplexing
I n t his case, by prior m ut ual agreem ent , each prot ocol is assigned t o a specific virt ual circuit ; for
exam ple, VC1 carries I P, et c. VC- based m ult iplexing m ay be dom inant in environm ent s w here
dynam ic creat ion of large num bers of ATM VCs is fast and econom ical.
LLC- based Mult iplexing
I n t his case one VC carries m ult iple prot ocols wit h prot ocol ident ifying inform at ion being cont ained
in each packet header. Despit e t he ext ra bandwidt h and processing overhead, t his m et hod m ay be
advant ageous if it is not pract ical t o have a separat e VC for each carried prot ocol, for exam ple, if
charging heavily depends on t he num ber of sim ult aneous VCs.
Traffic Shaping
Traffic Shaping is an agreem ent bet ween t he carrier and t he subscriber t o regulat e t he average rat e
and fluct uat ions of dat a t ransm ission over an ATM net work. This agreem ent helps elim inat e
congest ion, which is im port ant for t ransm ission of real t im e dat a such as audio and video
connect ions.
Peak Cell Rat e ( PCR) is t he m axim um rat e at w hich t he sender can send cells. This param et er m ay
be lower ( but not higher) t han t he m axim um line speed. 1 ATM cell is 53 byt es ( 424 bit s) , so a
m axim um speed of 832Kbps gives a m axim um PCR of 1962 cells/ sec. This rat e is not guarant eed
because it is dependent on t he line speed.
Sust ained Cell Rat e ( SCR) is t he m ean cell rat e of each burst y t raffic source. I t specifies t he
m axim um average rat e at which cells can be sent over t he virt ual connect ion. SCR m ay not be
great er t han t he PCR.
Maxim um Burst Size ( MBS) is t he m axim um num ber of cells t hat can be sent at t he PCR. Aft er MBS
is reached, cell rat es fall below SCR unt il cell rat e averages t o t he SCR again. At t his t im e, m ore
cells ( up t o t he MBS) can be sent at t he PCR again.
I f t he PCR, SCR or MBS is set t o t he default of " 0" , t he syst em will assign a m axim um value t hat
correlat es t o your upst ream line rat e.
Содержание VMG1312-B Series
Страница 4: ...Contents Overview VMG1312 B Series User s Guide 4 Troubleshooting 289 ...
Страница 14: ...Table of Contents VMG1312 B Series User s Guide 14 ...
Страница 15: ...15 PART I User s Guide ...
Страница 16: ...16 ...
Страница 30: ...Chapter 2 The Web Configurator VMG1312 B Series User s Guide 30 ...
Страница 35: ...Chapter 4 Tutorials VMG1312 B Series User s Guide 35 7 Click Apply to save your settings ...
Страница 77: ...77 PART II Technical Reference ...
Страница 78: ...78 ...
Страница 166: ...Chapter 9 Routing VMG1312 B Series User s Guide 166 ...
Страница 184: ...Chapter 10 Quality of Service QoS VMG1312 B Series User s Guide 184 ...
Страница 210: ...Chapter 13 Interface Group VMG1312 B Series User s Guide 210 ...
Страница 226: ...Chapter 15 Firewall VMG1312 B Series User s Guide 226 ...
Страница 232: ...Chapter 17 Parental Control VMG1312 B Series User s Guide 232 ...
Страница 242: ...Chapter 19 Certificates VMG1312 B Series User s Guide 242 ...
Страница 246: ...Chapter 20 Log VMG1312 B Series User s Guide 246 ...
Страница 250: ...Chapter 21 Traffic Status VMG1312 B Series User s Guide 250 ...
Страница 256: ...Chapter 24 IGMP Status VMG1312 B Series User s Guide 256 ...
Страница 260: ...Chapter 25 xDSL Statistics VMG1312 B Series User s Guide 260 ...
Страница 262: ...Chapter 26 User Account VMG1312 B Series User s Guide 262 ...
Страница 268: ...Chapter 29 TR 064 VMG1312 B Series User s Guide 268 ...
Страница 272: ...Chapter 30 Time Settings VMG1312 B Series User s Guide 272 ...
Страница 278: ...Chapter 32 Logs Setting VMG1312 B Series User s Guide 278 ...
Страница 296: ...Chapter 36 Troubleshooting VMG1312 B Series User s Guide 296 ...
Страница 336: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B Series User s Guide 336 ...
Страница 350: ...Appendix D Wireless LANs VMG1312 B Series User s Guide 350 ...
Страница 374: ...VMG1312 B Series User s Guide 374 Index ...
Страница 375: ...Index VMG1312 B Series User s Guide 375 ...
Страница 376: ...VMG1312 B Series User s Guide 376 Index ...