Sfaturi la conectarea modemului ADSL

eb2e2, on Sep 7 2007, 00:16, said:

Dr. Speed Touch, asta, merge si pt. 5x6? sau doar pt 330?

Djole, on Sep 6 2007, 17:17, said:

Nu-mi dă nimeni niciun răspuns? Vă rog! eu sunt mulțumit de performanțele modemului meu, dar mă interesează update-ul de firmware.

cum vi se pare urmatorile valori:

le am la un linksys:

DSL Status:   Connected
DSL Modulation Mode: MultiMode
DSL Path Mode: Fast
Downstream Rate: 1024 kbps
Upstream Rate: 256 kbps
Downstream Margin: 7 db
Upstream Margin: 21 db
Downstream Line Attenuation: 27 db
Upstream Line Attenuation: 4.5 db
Downstream Transmit Power: 0
Upstream Transmit Power: 0

nu prea stiu cum se interpreteaza...
mentionez ca inca NU s-a facut migrarea la 2MB

nu inteleg care e SNR aici, si ce conteaza defapt Downstream sau Upsteam Attenuation... Ce se intelege prin acel Downstream Margin?? are cineva idee?

Edited by abogo, 07 September 2007 - 18:28.

domi, on Sep 3 2007, 21:22, said:

changelog:
DMT v7.33
added: support for Speedtouch Firmware v6.2.15.5 - v6.2.17.5 (with limited functionality)
added: additional SNR-Monitor measuring method
added: SRA detection routine during SNR monitoring
added: ATU-C DSL-Version (VendorSpecific) --> Hex2Dec
added: Web-Interface (link)
fixed: bug in parsing routine (FW v6.1.4.6/7 adsl2+)
fixed: DMT-Window does not open centered (on screen) if additional startup-width was selected
fixed: Debug-Window cant be opened during resynchronisation or reboot

@abogo SNR=margin (Upstream or Downstream)

Edited by dondos, 07 September 2007 - 18:48.

Djole, on Sep 7 2007, 11:45, said:

Eu stiu ca la orice produs (placa de baza, placa video, routere etc.) nu se recomanda upgradeul de firmware daca produsul functioneaza ok, in parametri si daca nu ai avut probleme cu el... Sfatul meu ar fi sa nu te agiti cu firmwareul, daca nu ai probleme...

@ dondos

ok merci

dar valorile acestea cum ti se par?

Downstream Margin: 7 db
Upstream Margin: 21 db
Downstream Line Attenuation: 27 db
Upstream Line Attenuation: 4.5 db

sunt bune/sunt normale/sunt rele...

nu prea inteleg de cel la downstream margin este o valoare mica si la upstream margin e mare si la line attenuation se inverseaza situatia.

la ce valori te uiti ca sa-ti dai seama de calitatea liniei la Upstream sau la Downstream?

pana la urma tind sa cred ca trebuie sa existe un anumit raport intre SNR si Margin...care este acel raport ideal?

Edited by abogo, 07 September 2007 - 20:25.

iata ce am gasit pe un alt forum: (http://forums.whirlp...fm?t=433293#r14)

What is an ideal attentuation and noise margin figure?

The following may help. It is not my research but was posted some weeks ago by someone whom I neglected to identify.

Noise Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. The higher the number the better for this measurement. In some instances interleaving can help raise the noise margin to an acceptable level.

6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with little or no synch problems* (but see note below)
20dB-28dB is excellent
29dB or above is outstanding

* Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not show up in the figures.

Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. The lower the dB the better for this measurement.

20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues

DSL Rate ***/tx/rx/Rate
The actual service data rate that your ISP has provisioned.

Attainable Line Rate
This is the maximum rate at which your modem can connect to the DSLAM if there was no service provisioning limiting the bandwidth. The higher the number the better.

Occupancy
Occupancy is the percentage of line capacity used. Each DSL line is capable of a certain maximum speed or "capacity" dependant on line distance and other varying factors. The occupancy is an expression of your current sync rate setting over your maximum capacity. There are occupancy rates for both upload and download. The lower the figure, the better. Because of error correction and other factors in the DSL protocols, a margin is required so that a connection can be maintained under varying line conditions. If the occupancy approaches 100%, any interference can cause the ADSL sync to be lost. A useful measurement to monitor when sync problems occur. [AFAIK the billion SNMP utility does not give a direct measurement of occupancy :-( ]

(with due acknowledgment of the other sources/forums that this info was gleaned from)

---------------------------------------------------------------------------------

conform celor de mai sus si urmatorilor parametrii (ai mei)

DSL Modulation Mode: Multimode
Downstream Margin: 7 db
Upstream Margin: 21 db
Downstream Line Attenuation: 27 db
Upstream Line Attenuation: 4.5 db

pe upstream sta treaba foarte bine si pe downstream sta prost...
este posibil asa ceva?

-----------------------
am schimbat manual modulatia si astea sunt valorile acuma

DSL Status:   Connected
DSL Modulation Mode: T1.413
DSL Path Mode: Fast
Downstream Rate: 1024 kbps
Upstream Rate: 256 kbps
Downstream Margin: 31 db
Upstream Margin: 31 db
Downstream Line Attenuation: 18 db
Upstream Line Attenuation: 4.5 db
Downstream Transmit Power: 0
Upstream Transmit Power: 0

------------------------

DSL Status:   Connected
DSL Modulation Mode: G.dmt
DSL Path Mode: Fast
Downstream Rate: 1024 kbps
Upstream Rate: 256 kbps
Downstream Margin: 31 db
Upstream Margin: 24 db
Downstream Line Attenuation: 14 db
Upstream Line Attenuation: 4.5 db

-------------------

care este modulatia corecta pe care sa o aleg intre Multimode, T1.413, G.dmt, G.lite, ADSL2 sau ADSL2+?

Edited by abogo, 07 September 2007 - 20:43.

soft0811, on Sep 7 2007, 20:39, said:

Mulțumesc! Voi sta cuminte.

Nu ma pricep deloc asa ca va intreb cum vi se par parametrii liniei mele? Sint ok? Sau nu prea?
Va multumesc!

Modulation: G.992.1 Annex A
Bandwidth (Up/Down) [kbps/kbps]: 128 / 512
Data Transferred (Sent/Received) [KB/KB]: 0,00 / 0,00
Output Power (Up/Down) [dBm]: 8,5 / -2,4294967291
Line Attenuation (Up/Down) [dB]: 5,5 / 10,0
SN Margin (Up/Down) [dB]: 6,0 / 30,5
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 0 / 0
CRC Errors (Up/Down): 0 / 0
HEC Errors (Up/Down): 0 / 0

ms dondos, mai ramane cu semnul intrebarii ce am scris la  Post #44, poate se gaseste cineva s-a ma ajute

hubbabub1601, on Sep 7 2007, 00:17, said:

Dr. SpeedTouch merge DOAR pe varianta cu driverele mai vechi (și mai bune de altfel) ale modemului ST330. Pentru modelele ST din familia 5x6 se poate folosi DMT Tool.

abogo, on Sep 7 2007, 19:27, said:

la partea de Down e problemă destul de mare. Cred că ai parte de câteva deconectări pe zi ...

crn, on Sep 7 2007, 23:47, said:

Parametrii tăi pe parte de Upload sunt complet DEZASTRUOȘI ! Sincer m-aș mira dacă ai spune că nu ai deconectări la fiecare câteva minute... Atenuarea la Up este mică (bună), dar SNR-ul este la limita valorii de sincronizare. Unele modemuri stau mai mult deconectate la un SNR de 6

Edited by dragosbm, 08 September 2007 - 19:52.

@dragosbm

de cand am schimbat modulatia din router pe G.DMT s-au imbunatatit mult parametrii.

inca o intrebare: la multiplexing ce trebuie setat VC sau LLC?

DSL Status:   Connected
DSL Modulation Mode: G.dmt
DSL Path Mode: Fast
Downstream Rate: 1024 kbps
Upstream Rate: 256 kbps
Downstream Margin: 30 db
Upstream Margin: 24 db
Downstream Line Attenuation: 14 db
Upstream Line Attenuation: 4.5 db
Downstream Transmit Power: 0
Upstream Transmit Power: 0
Cisco Logo
  
PVC Connection

Encapsulation: RFC 2516 PPPoE
Multiplexing: VC
Qos: UBR
Pcr Rate: 0
Scr Rate: 0
Autodetect: Enable
VPI: 0
VCI: 35
Enable: Yes
PVC Status: Up

Fir adunat colac, INCORECT, lucreaza ca o bobina si aduna toate perturbatiile!

mare prostie... pana acum asa am avut cablu... chiar pe o rola strans... si l-am dat si eu jos sa urmez sfaturile...
surpriza:
nici un parametru nu s-a miscat... nici macar cu 0.1 unitati
...deci e o abureala. punct.

abogo, on Sep 9 2007, 12:11, said:

LLC. Eu așa țin minte parcă ...

dreyfus, on Sep 9 2007, 15:24, said:

Perfect de acord cu tine !

Edited by dragosbm, 09 September 2007 - 15:43.

Azi am fost la romtelecom si mi-am facut abonament de 1mbps . Am primit modemul ADSL cu router si interfata enthernet.
Am vrut sa il instalez..dar nu prea ma pricep distanta de la accea priza RJ11 e cam mare..ce pot face?

Ai un manual in care ti se dau toate explicatiile necesare.
Intre modem si priza telefonica pui cablu telefonic (daca nu ajunge cumperi unul mai lung, evident ). Sau pui modemul aproape de priza si iei un cablu de retea mai lung.

[quote name='abogo' date='Sep 9 2007, 12:11' post='3353861']
@dragosbm

de cand am schimbat modulatia din router pe G.DMT s-au imbunatatit mult parametrii.

Explica te rog cum pot schimba modulatia in cazul in care folosesc speedtouch 516V6, rutat ppoe!  Ma intereseaza  mai mult in scop educativ decat practic deoarece nu mi s-a deconectat niciodata in timpul lucrului si nu am avut prea mari probleme pana acum, desi parametrii liniei mele sunt slabuti: atenuare 46 db si snr 25 db.

Kunzite, on Sep 12 2007, 10:16, said:

ok..il instalez,cd ok..trebuie setat cumva? sa mearga mai bine? vad pe aici "rutat ppoe" etc. nu inteleg mai nimic.