just my 2c to add to Ronni's comment i was called in to followup a problem like this & found that the wiring in the 'junction box' in the roof was loose (very poorly done) in an other case there was the connection/ loop through in the kitchen not done (the wires layed paralell & thus the high frequency could pass through) you are sure you have no funny noise on the line (just dial a 0 & listen a few seconds if there is silence James
SAD Technic U3 6 Chalkley Pl Bayswater WA Australia +618 9370 5307 mob 0414 421132 (international +614 14421132) [email protected] http://www.members.iinet.net.au/~saddas/ Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish. On 14/06/2011, at 9:26 PM, Ronda Brown wrote: > > On 14/06/2011, at 6:50 PM, John Daniels wrote: > >> >> Hi everyone >> >> I am still being plagued with a big reduction in speed in the evening. Up >> until 3.20pm it was 162KBs, then went to 90KBs and 50KBs >> >> Has anyone else on Hammersley Exchange experienced this? >> >> Cheers >> >> John > Hi John, > > More details might help you get some advice. > What Modem? > What sync / attenuation stats is your modem reporting? (Line Speed / > Attenuation / Noise details) > What MTU setting do you have on your modem router? The MTU setting of your > router will lead to performance issues if set too high or too low. > The normal MTU (Maximum Transmit Unit) value for most Ethernet Networks is > 1500 Bytes, or 1492 Bytes for PPPoE connections. > > Have you tried an Isolation Test? > > Isolation Test > > So, you are on ADSL or ADSL2/2+ and are having some problems, someone has > told you to do an isolation test and you have no idea what that is. > > What is an Isolation test > Basically an Isolation test is when you remove all telephony devices in your > premises from the phone line. These can include ADSL filters, phones, faxes, > answering machines, Foxtel Digital (or any other Digital PayTV), EFTPOS > machines, back-to-base alarm systems, dialup modems, medical alterting > systems etc – basically anything that plugs into the phone line. > > After all devices have been removed, plug your ADSL broadband modem directly > into the first phone socket into the house, bypassing any ADSL > filters/splitters (just to eliminate these as a possible problem). The first > socket is generally the one in the common area of the house (kitchen or > lounge/front room), but you may have to consider where the line comes into > the house and trace it if necessary – especially if multiple sockets have > been installed. Use the shortest phone cable you have (ie 1-2m), and try > another phone cable if there is no luck with the first. Try various phone > sockets in the house if what you think is the first socket doesn't work; it's > not impossible for a single socket to have a fault, and if the house has a > central filter fitted then some sockets may have no ADSL signal at all by > design. > > Monitor the Internet connection for the difficulty you were experiencing to > see if it clears. If the problem is still there, refer notes below. > > If the difficulty you were experiencing clears, then you can connect one > filter and one telephony device to your phone line, and monitor your internet > connection again for the difficulty you were experiencing. > > By connecting telephony devices one by one, and testing your internet > connection each time when you add another device, this process of elimination > should single out the telephony device which causes difficulty with your > Internet connection. Bear in mind that since adding a single telephony device > will introduce a piece of equipment, a filter and a line cord into the > circuit, *any one of these things* could introduce a fault into the circuit – > be prepared to swap equipment around and test rigorously. > > What is the purpose for doing an Isolation test > If you are having issues with things like your connection dropping out (modem > losing ADSL sync), noise/static on your phone line, slower speeds than usual, > then this test can help isolate the issue. > > All these issues are often caused by some form of interference induced into > line, which could be a result of bad filters, dodgy phone cables, > malfunctioning telephony equipment, or even nearby electrical devices. Ensure > that "pest-it" and other electronic rodent repellers (like the devices Dick > Smith and others sell) are removed from power points – these often cause > problems with ADSL signals. The same goes for any electrical equipment > capable of generating an electromagnetic field, such as fridges/freezers, air > conditioners, compressors, cordless phones, microwave ovens, flourescent > lights etc. This alone is a good argument for not using extension cords, as > they act as an antenna for electromagnetic interference induction. > > Notes > > • If after you have done all this and still having issues, it isn't > always a problem with your line outside your house (Telstra's boundary), it > sometimes could be an issue with your internal wiring (eg a mouse could've > chewed the wires in your roof). Issues can also arise with corroded > cabling/sockets, problems with hardwired equipment that can't be removed > (alarm systems, wallphones, ringer bells), or internal cabling that won't > support ADSL due to faulty installation – the latter is why you try all the > sockets. > • If after you have done all this and still having issues, it isn't > always a problem with your line outside your house or your internal wiring. > It may be possible that your modem has gone faulty and would be good if > possible to test with another modem. > If you have completed your isolation tests and still have no ADSL connection, > an unstable connection, or a poor speed issue etc, it's time to escalate the > problem to your ISP and let them launch an investigation for you. It's in > your best interest to complete this process first though for several reasons: > • If the problem is on your end, you can clear it quickly > yourself. > • Your ISP will ask you to do it anyway, both for speed and to > protect you – see point 3 below. > • If a Telstra tech finds the problem is beyond the Telstra > Network Boundary Point (NBP), they not only charge you a large (in the > hundreds) exhorbitant fee, but they leave the problem as is and walk away. > This is because any and all wiring, sockets, equipment and connections > downstream/past the NBP are your privately owned equipment, which Telstra > will not service. Doing your isolation test thoroughly eliminates this as an > issue, protects you from being charged this fee, and allows you to correct > any issues with your own equipment more quickly than waiting for a Telstra > tech to do so. > > > Cheers, > Ronni > > 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt" > 2.3GHz / 8GB / 750GB @ 7200rpm HD > > OS X 10.6.7 Snow Leopard > Windows 7 Ultimate (under sufferance) > > > > > > > > > > > > > > > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Unsubscribe - <mailto:[email protected]> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Unsubscribe - <mailto:[email protected]>
