Re: [SLUG] Re: ADSL download speed/settings
Jake Anderson said: A filter that blocks frequencies not used for voice could well improve the SNR as delivered to the ear. (The ear being quite able to hear frequencies outside the range of the PSTN). ADSL uses frequencies above 25 kHz. Human hearing can hear frequencies up to 20 kHz, while working its way down to 16 kHz with age. Can you hear ADSL? signature.asc Description: OpenPGP digital signature -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
On Thu, May 19, 2011 at 1:02 AM, Jeremy Visser jer...@visser.name wrote: Jake Anderson said: A filter that blocks frequencies not used for voice could well improve the SNR as delivered to the ear. (The ear being quite able to hear frequencies outside the range of the PSTN). ADSL uses frequencies above 25 kHz. Human hearing can hear frequencies up to 20 kHz, while working its way down to 16 kHz with age. Can you hear ADSL? My answer to that is a qualified yes. Back in my early, early days of ADSL, I lived in a renter premises which had a wall-mounted Telstra phone. I had a tough time getting a filter for it, so I ran it without out (ADSL modem was on another socket). When I picked up the phone I could distinctly hear the data carrier - and the phone definitely interrupted any data based activity which was going on at the time. No idea if that's the case these days with ASDL2+ - I actually have a proper, working filter now. :-) DaZZa -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
Ken Foskey said: So I can totally remove the filter if only adsl connected? Phone is on another socket on same line Yes, absolutely. ADSL filters stop the voiceband devices interfering with the modem, not vice versa. On a splitter+filter, the phone plug goes through the filter, but the ADSL plug is a simple pass-through without any filtering. Some people will claim that their PSTN voice quality improves with a filter, but as the filters are not designed to do that people who claim that are suffering from the placebo effect. From Wikipedia: Typical installation for an existing home involves installing DSL filters on every telephone, fax machine, voiceband modem, and other voiceband device in the home, leaving the DSL modem as the only unfiltered device. http://en.wikipedia.org/wiki/DSL_filter signature.asc Description: OpenPGP digital signature -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
On 05/15/2011 08:50 PM, Jeremy Visser wrote: Ken Foskey said: So I can totally remove the filter if only adsl connected? Phone is on another socket on same line Yes, absolutely. ADSL filters stop the voiceband devices interfering with the modem, not vice versa. On a splitter+filter, the phone plug goes through the filter, but the ADSL plug is a simple pass-through without any filtering. Some people will claim that their PSTN voice quality improves with a filter, but as the filters are not designed to do that people who claim that are suffering from the placebo effect. I wouldn't say that is necessarily true. The frequency range transmitted through PSTN is quite narrow and any noise introduced into the line outside that range is going to be just that, noise. A filter that blocks frequencies not used for voice could well improve the SNR as delivered to the ear. (The ear being quite able to hear frequencies outside the range of the PSTN). Ergo if you have high frequency noise on the line (or your noise is made of high frequency components, clicks and buzzes perhaps) an adsl filter would do a good job of knocking that on the head. Wont do your ADSL any favours however. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] Re: ADSL download speed/settings
Thanks for the replies. 1) my Billion 7800N has an firmware update ( for ipv6) which I have yet to install. 2) my modem router is connected to the first connection on the phone line ( enters directly from outside wall ) - only phone is connected to phone line further along in another room - it has an ADSL 2+ filter. Note - originally had Modem/Router connected to filter - dropped speed from 250 to 150 Kibs (?). Removed filter and placed upstairs with phone. 3) Phone line is not shared and is directly connected from tub in street. 4) tried TPG maps link. I'm on COMO exchange in Southern Sydney (The Shire) - no TPG details for Como. 5) http://www.yourbroadband.com.au/exchanges.php?Exchange=COMO shows details of ISPs using Como exchange, though my ISP PeopleTelecom is not listed. 6) Dazza's link http://www.adsl2exchanges.com.au Rim Information for Como shows that I am nowhere near a RIM. Telstra has ADSL 2+ enabled. I am about 900 m as the crow flies and actual about 1.6 Km from the exchange with an estimated max speed of 170,000 and am in Zone 1 --- Will update modem/router firmware and use a shorter cable from wall socket to modem/router and see what changes (if any) develop. Thanks to all. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
On Wed, May 11, 2011 at 4:04 PM, gonzo01 gonz...@fastmail.fm wrote: 6) Dazza's link http://www.adsl2exchanges.com.au Rim Information for Como shows that I am nowhere near a RIM. Telstra has ADSL 2+ enabled. I am about 900 m as the crow flies and actual about 1.6 Km from the exchange with an estimated max speed of 170,000 and am in Zone 1 --- If you're only 1.6 km cable distance from the exchange, you should be getting way better than you're quoting - I'm an estimated 2.22 km cable distance from the exchange, and I get on average 13 megabits per second on my ADSL2 link - and the cabling in this house purely sucks. Call your ISP and ask if they can check your line - but remove any extension cables first, because the first thing they'll ask you is if your modem is directly connected to the phone socket. DaZZa -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
On 05/11/2011 04:41 PM, DaZZa wrote: On Wed, May 11, 2011 at 4:04 PM, gonzo01gonz...@fastmail.fm wrote: 6) Dazza's link http://www.adsl2exchanges.com.au Rim Information for Como shows that I am nowhere near a RIM. Telstra has ADSL 2+ enabled. I am about 900 m as the crow flies and actual about 1.6 Km from the exchange with an estimated max speed of 170,000 and am in Zone 1 --- If you're only 1.6 km cable distance from the exchange, you should be getting way better than you're quoting - I'm an estimated 2.22 km cable distance from the exchange, and I get on average 13 megabits per second on my ADSL2 link - and the cabling in this house purely sucks. Call your ISP and ask if they can check your line - but remove any extension cables first, because the first thing they'll ask you is if your modem is directly connected to the phone socket. DaZZa Extension cables are really really crap, if you can make it under a meter it'll make a difference. I believe its mainly because they aren't made of twisted pair. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Re: ADSL download speed/settings
So I can totally remove the filter if only adsl connected? Phone is on another socket on same line Ken Foskey-- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] Re: ADSL download speed/settings
Problem solved - or at least situation improved greatly. Remember to ALWAYS check cabling - I forgot that between the wall-socket and my modem/router my line ran through my power board. connected modem router straight to wall socket and speeds increased:- ping 37ms jitter 6ms download 6.14Mbps upload 0.32Mbs cant check packet loss - probably due to ISP's firewall. Ken, I'm not currently running through a filter. My house is cabled for ethernet/cable TV/Phone using Cat5 cables. Telstra line comes in to side of house and Cat5 is run around 2 metres to inside wall connection for modem, then line runs to other room(s) where phone is attached. Hope this helps somebody else. Thanks to all who replied. Now I just need to update the Modem Firmware and redo all of its settings. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
