Jump to content

Ultimativni ADSL topik


Lex

Recommended Posts

na beotelu je zadnjih 20ak dana tragedija, kad ih zoves i pitas sta se desava , ne pitaju te nista ni za broj telefona ni dal imas ruteer/modem , samo ti kazu da je telekom preoterecen a nema dovoljno kapaciteta...smradovi lopovski i prokleta drzava.

Procitao sam negde cene RUMUNSKOG interneta i oni placaju 30720/3072 vdsl za 15 evra mesecno (1450 dinara!!!!)

Dali smo mi toliko truli?

Link to comment
Share on other sites

Nvm, nalazi se u Basic Options a ne u Toolsu samo stim sto meni nece da se konektuje na net kada je u g.dmt modu :(

btw EchoLife HG520s

Oh boze, uspeo sam da se konektujem kad sam prebacio eternet kabl iz prvog u cetvrti port, mada mi se nesto smanjila brzina neta :D

Edited by DaNte ?

infidel

Link to comment
Share on other sites

G.dmt

This refers to the ADSL standard approved by the International Telecommunications Union (ITU). G.dmt indicates full rate ADSL which provides standards for higher speed ADLS than G.lite. G.dmt provides maximum data rates of 8 Mbps downstream to the subscriber and 1.5 Mbps upstream from the subscriber.

ADSL2+

has only been available since it was approved for use in September 2005. ADSL2+ means you can now get even higher speeds than ever before. ADSL2+ (G.992.5), more than doubles the downstream data rate (bandwidth) of ADSL to as much as 25M bit/sec. (25 Mbps)

d127a2246b.jpg

Link to comment
Share on other sites

G.dmt ADSL2 ADSL2+ na Telekom 16mbit/768kbit

adsl2plus.jpg

adsll.jpg

gdmt.jpg

dok smo bili 'osudjeni' na male brzine

adsl2plus2mbit.jpg

adslgdmt2mbit.jpg

SNR/ATT i max brzina konekcije

SNR or Signal to Noise Ratio:

Describes the ratio of usable data-signals on your line. You can associate the "signal" with the data traveling across your ADSL-line and the "noise" as the unwanted interference affecting the signal. 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

20dB-28dB is excellent

29dB or above is outstanding

If your SNR is below 12dB you are pretty much screwed and will not get a consistent level of ADSL-service. You could try to convince Telkom to rewire the cabling - but this is unlikely to happen.

Attenuation:

Is the reduction in signal strength on your phone line. In ADSL this may be reported as "loop loss" and is the natural deterioration of the ADSL signal over distance from the exchange. Attenuation is normally directly linked to the length of your line. Copper is traditionally used in the local loop and the higher gauge of copper will give the best signal, however some lines may have some aluminium or aluminium joints on the line which will increase resistance... as will oxidisation of joints. 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

The standard signal attenuation spread for a given speed is somewhere in the region of 25-30dB for ADSL1 speeds (if we had ADSL2/2+ this would be).

The following guide (distance vs. attenuation vs speed) gives you an guestimate what you can achieve:

<1km should be 23-24Mbit (nice speed, but doesn't it bug you that Telkom people walk through your bedroom?)

1.0km = 13.81dB = 23Mbit

1.5km = 20.7dB = 21Mbit

2.0km = 27.6dB = 18Mbit

2.5km = 34.5dB = 13Mbit

3.0km = 41.4dB = 8Mbit

3.5km = 48.3dB = 6Mbit

4.0km = 56dB = 4Mbit

4.5km = 62.1dB = 3Mbit

5.0km = 69dB = 2Mbit

>5.0km (you are pretty much poked --- sorry for you)

Edited by Muerte
Link to comment
Share on other sites

sta da guglam kad se ne razumem u tematiku ?!:D

zato sam i stavio slike da vidis kako promena modulacije g.dmt / ADSL2 / AdSL2+

uticu na brzinu veze (obicno 1 slika vredi 1000 reci al tebi nista zato sumnjam da si ih upste pogledao)

losa kucna instalacija je glavni problem kod vecine i naravno telekom daje lose rutere tako treba da se pazi na ukupan broj konekcija

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...