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tgk... |
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Reply #1041 hhbks's post
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kici,kalu itew download naik,tu baru okay..ni upload saja.... |
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Reply #1043 razhar's post
refer post aku nombo #1034  |
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Reply #1046 bzzts's post
terus tarak upload margin....
[ Last edited by razhar at 20-1-2009 05:03 PM ] |
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Reply #1049 bzzts's post
tapi yg upload margin jadi teloq tu okay kaaa,kici? penting sangat ke margin dgn US line attenuation? boleh kao explain sikit bab2 ni? |
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Reply #1050 razhar's post
spatutnya yg post #1026 tu dah ok dah. menten je guna. nnt lama2 rasa le laju.
lgpun aku punya connection 1.5mb ni pun terasa sesak jugak masa nak load apa2 website 2-3minggu sblom ni. skrg baru ok sikit. |
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Reply #1051 bzzts's post
bai....
1. DS Line Attenuation
2. US Line Attenuation
3. US Margin
4. DS Margin
empat2 ni,apa yg boleh dibuat untuk memastikan kita mendapat speed dan line yg stabil? dan berapa rate yg patut... |
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'lower noise margin = higher sync speed. however if your noise margin gets too low, (below 6 usually), then it becomes difficult for you modem to maintain sync and you get dropouts. so the trick is finding the lowest SNR that you can maintain a reliable sync on. |
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'A low SNR can result in an unstable line.' |
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Line Attenuation
Line attenuation is an indicator of line health. ADSL, Line Attenuation is the energy loss of signal transmission through the phone line.
Several things can cause higher line attenuation, including匸/color]
- Distance from the exchange
- Type of cable & gauge of wire
- Phone line joins, such as wire connectors
- Additional phone points
- Star wiring
- Corrosion on your phone line
The lower the line attenuation, the better.
| 20bB. and below | = | Outstanding | | 20dB-30dB. | = | Excellent | | 30dB-40dB. | = | Very Good | | 40dB-50dB. | = | Good | | 50dB-60dB. | = | Poor and may experience connectivity issues | | 60dB and above | = | Bad and will experience connectivity issues |
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SNR Margins (Signal to Noise Ratio Margins)
Signal to Noise Ratio simply refers to how loud the signal is over background noise. The higher the SNR margin, the more stable the connection because of fewer errors.
A strong signal will allow the line to cope with faster speeds.
In general, a higher signal to noise ratio will result in less errors.
| 6bB. or below | = | Bad and will experience no line synchronisation or intermittent synchronisation problems. | | 7dB-10dB. | = | Fair but does not leave much room for variances in conditions. | | 11dB-20dB. | = | Good with little or no synchronisation problems | | 20dB-28dB. | = | Excellent | | 29dB. or above | = | Outstanding |
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Calculating your distance from the exchange
A handy equation that we use is to divide the downstream attenuation by 13.81. This will give you a fairly accurate distance from the exchange measured in kilometres.
For example; if you had a downstream attenuation of 30dB匸/color]
30dB divided by 13.81 = 2.172 KM |
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ADSL troubleshooting & your alarm system
Alarm systems, when wired correctly for monitoring, process the phone line first before it has the opportunity to travel throughout the premises or to you modem.
This is referred to as Mode 3 wired. The purpose of wiring your alarm system to Mode 3 configuration, is to ensure it is able to dial out in the event of a break in, regardless if the phone has been accidently left off the hook or if the phone is forcibly removed.
If the ADSL line is the same line being used in monitoring the alarm system, then a good quality Central / Remote Splitter must be fitted to the premises ensuring that there is no broadband signal being processed by the alarm.
In short, alarm systems hate ADSL broadand and modems hate alarms.
Failure to do so can result in ADSL drop outs, slow speeds, synchronisation problems, phone lines cutting out etc. |
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Poor quality wiring
=Line health will be dependent on the existing phone cabling.
=Energy is required for ADSL signals to travel along phone cables and turn corners. Therefore, more phone cables / extensions (Star wiring) or phone points connected to the line will result in a poorer quality ADSL phone line or higher line attenuation.
=The same goes for corrosion on the line. The more corrosion, the higher the resistance resulting in a poorer quality signal.
=The best way to ensure the best quality signal is to have one phone point wired to standard or install a good quality Central / Remote Splitter .
=A Central / Remote Splitter will allow many phone line extensions without interference of the ADSL signal to the modem. |
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Use good quality phone cable when wiring your house
If you want to future proof your new home or home business, we would recommend that a cat 5, 4 line cable be used for pre-wiring your phone lines.
This is a good quality cable that has the capacity to connect 4 separate phone lines at any one time if required.
Another advantage is that these 4 separate phone lines will not interfere with each other when used in conjunction with multiple workstation devices attached to the line, such as faxes, eftpos machines and telephones etc. |
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Post time 20-1-2009 04:16 PM
