I just had to deal with Telecom over a customer of ours who was having trouble getting connected and I was wondering if anyone here had experience with or had heard of the excuse Telecom gave me. The customer in question lives on Wahiki Island and cannot connect to our pool at anything greater than 13200 (if that). After excluding all the usual problems (bad lines, bad modem etc etc) we opened a fault with Telecom who quite happily informed us that the reason it wouldn't connect at a decent speed was that the homeowner was on "Size Core" lines instead of normal phone lines, due to being so remote. When pressed for an explanation the person in question could only tell me that "It was a method for making 8 home lines go over a single normal line". They said they couldn't give me a better explanation and didn't want to hand me to someone who could. And that was pretty much that. Has anyone else had any experience with this sort of technology (or lack of it) and could anyone shed anymore light on the widespereadness of it's use and if it's going to become more so. Chris Rigby Senior Systems Engineer IHUG - Into the Internet --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
:: When pressed for an explanation the person in question could :: only tell me :: that "It was a method for making 8 home lines go over a single normal :: line". They said they couldn't give me a better explanation :: and didn't :: want to hand me to someone who could. And that was pretty much that. They had those in Albany as well... not "party lines" but something akin to "multiplexed lines". Anyway, the guy who runs the Internet café on Waiheke (nice food there, btw) says there's only a single coax cable connecting the island to the mainland. Says he's lucky to get 33.6Kbps, and when the banks offload their data (EFTPOS etc), the connection just croaks. -- Juha --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
Ok. I found it out "Size Core" is like a 0+2 but its a 0+8 which means he
shares his telecom bandwidth with 8 other customers! Those on 0+2 will know
that the quality of those lines (BAD), so a 0+8 will be MUCH worse(useless).
The best the customer can do is contact 123 and see if there is an
alternative feed available now, and they may change the customer over.
Secondary they can contact 120 complaining about their connection speeds
below 28800 as this is what telecom "Guarantee" (depending on who you talk
to)
Thanks
Craig Whitmore
Orcon Internet
----- Original Message -----
From: "Juha Saarinen"
:: When pressed for an explanation the person in question could :: only tell me :: that "It was a method for making 8 home lines go over a single normal :: line". They said they couldn't give me a better explanation :: and didn't :: want to hand me to someone who could. And that was pretty much that.
They had those in Albany as well... not "party lines" but something akin to "multiplexed lines".
Anyway, the guy who runs the Internet café on Waiheke (nice food there, btw) says there's only a single coax cable connecting the island to the mainland. Says he's lucky to get 33.6Kbps, and when the banks offload their data (EFTPOS etc), the connection just croaks.
-- Juha
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At 15:00 28/05/01 +1200, Chris Rigby wrote:
Telecom who quite happily informed us that the reason it wouldn't connect at a decent speed was that the homeowner was on "Size Core" lines instead of normal phone lines, due to being so remote.
Its probably in extended version of the old 2-in-one telecom line multiplexer. These old multiplexers, which are still in use in many places, (including big cities) are analog line doublers, where one of the voice signals is mixed up to a higher frequency, and on the other side (in the exchange normally) mixed down again. Using this system, it should be possible to mix multiple voice bands (each about 2.x Khz) on top of each other. ofcourse this requires agressive filtering, and will limit the bandwidth of the voice channel, and therefore the maximum throughput on modem connections. Bart Bart Kindt Director, Network Operations The Internet Group Limited New Zealand --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
At 4:15 pm +1200 5/28/01, Bart Kindt wrote:
These old multiplexers, which are still in use in many places, (including big cities) are analog line doublers, where one of the voice signals is mixed up to a higher frequency, and on the other side (in the exchange normally) mixed down again.
That's the old "1+1" type. The later ones deployed are "0+2" where there is no baseband channel (IIRC). When I was out at Riversdale Beach, I had a 2nd line put in for a modem. The installer was about to put in a 0+2, due to scarcity of pairs. I convinced him that this wouldn't work with my modem, so he pinched someone else's line to use as my 2nd one, and put the 0+2 in further down the street. :^) -- Andrew P. Gardner barcelona.com stolen, stmoritz.com stays. What's uniform about the UDRP? We could ask ICANN to send WIPO a clue, but do they have any to spare? Get active: http://www.tldlobby.com --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
:: Its probably in extended version of the old 2-in-one telecom :: line multiplexer. :: These old multiplexers, which are still in use in many :: places, (including :: big cities) are analog line doublers, where one of the voice :: signals is :: mixed up to a higher frequency, and on the other side (in :: the exchange :: normally) mixed down again. Using this system, it should be :: possible to mix :: multiple voice bands (each about 2.x Khz) on top of each :: other. ofcourse :: this requires agressive filtering, and will limit the :: bandwidth of the :: voice channel, and therefore the maximum throughput on modem :: connections. I remember that from the ADSL rollout... multiplexed lines aren't terribly good for Jetstream service ;-) -- Juha --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
Telecom who quite happily informed us that the reason it wouldn't connect at a decent speed was that the homeowner was on "Size Core" lines instead of normal phone lines, due to being so remote.
Its probably in extended version of the old 2-in-one telecom line multiplexer. These old multiplexers, which are still in use in many places, (including
It's manufactured by a company called Seiscor (or something like that). Whereas the 1+1 equipment adds a single extra circuit at a higher frequency, on top of an existing phone line circuit a bit like ADSL does. The Seiscor equipment puts 8 phone lines over a single copper pair. It doesn't carry a normal circuit and all 8 channels are carried stacked up at higher frequencies and converted to phone lines usually in a roadside cabinet. Either way the frequency performance of the lines is pretty well restricted to 3 kHz or so. Best of luck getting a line... Mike (Ex Telecom employee..... one of many ....) -- --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog
Seiscor is a method of superimposing upto 8 lines over 1 copper pair using
high frequency carriers to modulate each line.
The down side of this is that each line has a demux and a bandpass filter,
thus reducing data speed :(
My suggestion is to get the customer to ask telecom for a dedicated cable
pair if possible.
I am surprised that they can even get 13200!!!
Russ
----- Original Message -----
From: "Chris Rigby"
I just had to deal with Telecom over a customer of ours who was having trouble getting connected and I was wondering if anyone here had experience with or had heard of the excuse Telecom gave me.
The customer in question lives on Wahiki Island and cannot connect to our pool at anything greater than 13200 (if that). After excluding all the usual problems (bad lines, bad modem etc etc) we opened a fault with Telecom who quite happily informed us that the reason it wouldn't connect at a decent speed was that the homeowner was on "Size Core" lines instead of normal phone lines, due to being so remote.
When pressed for an explanation the person in question could only tell me that "It was a method for making 8 home lines go over a single normal line". They said they couldn't give me a better explanation and didn't want to hand me to someone who could. And that was pretty much that.
Has anyone else had any experience with this sort of technology (or lack of it) and could anyone shed anymore light on the widespereadness of it's use and if it's going to become more so.
Chris Rigby Senior Systems Engineer IHUG - Into the Internet
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participants (7)
-
Andy Gardner -
Bart Kindt -
Chris Rigby -
Craig Whitmore -
Juha Saarinen -
Mike Savory -
Russell Sharpe