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Chapter 25 xDSL Statistics
VMG1312-B Series User’s Guide
258
The following t able describes t he labels in t his screen.
Table 97
St at us > xDSL St at ist ics
LABEL
DESCRIPTION
Refresh I nt erval
Select t he t im e int erval for refreshing st at ist ics.
Line
Select w hich DSL line’s st at ist ics you want t o display.
xDSL Training
St at us
This displays t he current st at e of set t ing up t he DSL connect ion.
Mode
This displays t he I TU st andard used for t his connect ion.
Traffic Type
This displays t he t ype of t raffic t he DSL port is sending and receiving.
I na ct iv e
displays if
t he DSL port is not current ly sending or receiving t raffic.
Link Upt im e
This displays how long t he por t has been running ( or connect ed) since t he last t im e it was
st ar t ed.
xDSL Port Det ails
Upst ream
These are t he st at ist ics for t he t raffic direct ion going out from t he port t o t he service
provider.
Downst ream
These are t he st at ist ics for t he t raffic direct ion com ing int o t he port from t he service
provider.
Line Rat e
These are t he dat a t ransfer rat es at w hich t he port is sending and receiving dat a.
Act ual Net Dat a
Rat e
These are t he rat es at which t he port is sending and receiving t he payload dat a w it hout
t ranspor t layer pr ot ocol header s and t raffic.
Trellis Coding
This displays w het her or not t he port is using Trellis coding for t raffic it is sending and
r eceiving. Trellis coding helps t o r educe t he noise in ADSL t ransm issions. Trellis m ay reduce
t hroughput but it m akes t he connect ion m ore st able.
SNR Margin
This is t he upst r eam and dow nst ream Signal- t o- Noise Rat io m argin ( in dB) . A DMT sub-
carrier ’s SNR is t he rat io bet w een t he received signal power and t he received noise power.
The signal- t o- noise rat io m argin is t he m axim um t hat t he received noise power could
increase w it h t he syst em st ill being able t o m eet it s t ransm ission t ar get s.
Act ual Delay
This is t he upst ream and downst ream int erleave delay. I t is t he wait ( in m illiseconds) t hat
det erm ines t he size of a single block of dat a t o be int erleaved ( assem bled) and t hen
t ransm it t ed. I nt erleave delay is used when t ransm ission error correct ion ( Reed- Solom on)
is necessar y due t o a less t han ideal t elephone line. The bigger t he delay, t he bigger t he
dat a block size, allow ing bet t er error cor rect ion t o be per for m ed.
Transm it Pow er
This is t he upst r eam and dow nst ream far end act ual aggregat e t ransm it pow er ( in dBm ) .
Upst ream is how m uch pow er t he port is using t o t ransm it t o t he service provider.
Dow nst ream is how m uch port t he service provider is using t o t ransm it t o t he por t .
Receive Pow er
Upst ream is how m uch pow er t he service pr ovider is r eceiving from t he port . Dow nst ream
is how m uch pow er t he por t is receiving fr om t he ser vice pr ovider.
Act ual I NP
Sudden spikes in t he line’s level of ext ernal noise ( im pulse noise) can cause errors and
result in lost packet s. This could especially im pact t he qualit y of m ult im edia t raffic such as
voice or video. I m pulse noise prot ect ion ( I NP) pr ovides a buffer t o allow for cor r ect ion of
errors caused by error correct ion t o deal wit h t his. The num ber of DMT ( Discret e Mult i-
Tone) sym bols shows t he level of im pulse noise pr ot ect ion for t he upst ream and
dow nst ream t raffic. A higher sym bol value provides higher err or cor rect ion capabilit y, but it
causes overhead and higher delay which m ay increase error rat es in received m ult im edia
dat a.
Tot al At t enuat ion
This is t he upst ream and downst ream line at t enuat ion, m easured in decibels ( dB) . This
at t enuat ion is t he difference bet w een t he power t ransm it t ed at t he near- end and t he pow er
received at t he far- end. At t enuat ion is affect ed by t he channel charact erist ics ( w ire gauge,
qualit y, condit ion and lengt h of t he physical line) .
At t ainable Net
Dat a Rat e
These are t he highest t heoret ically possible t ransfer rat es at which t he port could send and
receive payload dat a w it hout t ransport layer prot ocol headers and t raffic.
xDSL Count ers
Summary of Contents for VMG1312-B Series
Page 4: ...Contents Overview VMG1312 B Series User s Guide 4 Troubleshooting 289 ...
Page 14: ...Table of Contents VMG1312 B Series User s Guide 14 ...
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 30: ...Chapter 2 The Web Configurator VMG1312 B Series User s Guide 30 ...
Page 35: ...Chapter 4 Tutorials VMG1312 B Series User s Guide 35 7 Click Apply to save your settings ...
Page 77: ...77 PART II Technical Reference ...
Page 78: ...78 ...
Page 166: ...Chapter 9 Routing VMG1312 B Series User s Guide 166 ...
Page 184: ...Chapter 10 Quality of Service QoS VMG1312 B Series User s Guide 184 ...
Page 210: ...Chapter 13 Interface Group VMG1312 B Series User s Guide 210 ...
Page 226: ...Chapter 15 Firewall VMG1312 B Series User s Guide 226 ...
Page 232: ...Chapter 17 Parental Control VMG1312 B Series User s Guide 232 ...
Page 242: ...Chapter 19 Certificates VMG1312 B Series User s Guide 242 ...
Page 246: ...Chapter 20 Log VMG1312 B Series User s Guide 246 ...
Page 250: ...Chapter 21 Traffic Status VMG1312 B Series User s Guide 250 ...
Page 256: ...Chapter 24 IGMP Status VMG1312 B Series User s Guide 256 ...
Page 260: ...Chapter 25 xDSL Statistics VMG1312 B Series User s Guide 260 ...
Page 262: ...Chapter 26 User Account VMG1312 B Series User s Guide 262 ...
Page 268: ...Chapter 29 TR 064 VMG1312 B Series User s Guide 268 ...
Page 272: ...Chapter 30 Time Settings VMG1312 B Series User s Guide 272 ...
Page 278: ...Chapter 32 Logs Setting VMG1312 B Series User s Guide 278 ...
Page 296: ...Chapter 36 Troubleshooting VMG1312 B Series User s Guide 296 ...
Page 336: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B Series User s Guide 336 ...
Page 350: ...Appendix D Wireless LANs VMG1312 B Series User s Guide 350 ...
Page 374: ...VMG1312 B Series User s Guide 374 Index ...