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Standard User MrOptimistic
(member) Thu 28-Apr-11 10:43:36
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A couple of questions I was afraid to ask....


[link to this post]
 
These things have always puzzled me:
a) had a Thompson adsl router. On my 2Mbps fixed line the noise margin would be high after a reset and then slowly decline over days until I had to reset it again. The new dlink router doesn't seem to need this periodic refresh. Can anyone explain the technicalities?
b) why do upstream and downstream attenuation figures differ ? Surely its the same piece of wire ?

Thanks to anyone kind enough to answer.
Standard User XRaySpeX
(knowledge is power) Thu 28-Apr-11 10:57:32
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Re: A couple of questions I was afraid to ask....


[re: MrOptimistic] [link to this post]
 
a) Don't know but do you mean a Router or a Modem (e.g. Thomson Speedtouch 330)?

b) Generally Down Attn. = about 2 x Up Attn. This is because Up uses much fewer frequencies than Down.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU BB => 2010: Orange 19 Meg Tweaked / 16 Meg Untweaked LLU BB
Standard User john2007
(legend) Thu 28-Apr-11 11:34:48
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Re: A couple of questions I was afraid to ask....


[re: XRaySpeX] [link to this post]
 
...and the up frequencies are lower and are attenuated less.


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Standard User MrOptimistic
(member) Fri 29-Apr-11 08:48:13
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Re: A couple of questions I was afraid to ask....


[re: john2007] [link to this post]
 
Thanks. It was a Thompson 560 if I recall, adsl modem/router.
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