August 31st, 2005


Dumb DSL questions

Say you have two phone jacks in your house. One (A) just has a phone going to it, and it has a wall-mounted DSL filter. The other (B) gets split at the jack. One end of the split (B1) is plugged into a filter and then a phone. The other end (B2) gets split again; one end (B2a) goes directly to the DSL modem, no filter, and the other (B2b) goes into a filter, into an answering machine, and then directly into a phone.

Is there anything about this setup that needs another filter (answering machine to phone?), or fewer splits (we could ditch B1 without too much trouble)? Could this setup account for our getting 100% of our advertised bandwidth up, but only about 10% of our bandwidth down?

(I'll probably end up crawling around on the floor disconnecting things and rebooting the modem—oh, and we have a wireless router too—tonight anyway, but that's tedious and if anyone can assure me whether it's definitely a complete waste of time, that would be nice. Next step, of course, is to contact Verizon. (Oh joy.))

wood cat

DSL query update

After rewiring as suggested in the last post [*], our speeds jumped from about 75 Kbps down, to about 200 Kbps down. Which is a huge improvement, even though the advertised speed is 768 Kbps. I anticipate that getting Verizon to care about a download speed 1/4 of the advertised, rather than 1/10, will be a lot harder, but I will try. Some other time.

[*] Splitting the upstairs phone jack, B, close to the wall; B1 goes straight to the DSL modem, B2 is filtered at the split and then goes into the answering machine/telephone. (We dropped one of the phones that had been upstairs). We also tested plugging the DSL modem straight into the jack without anything else split, and got the same speeds.

Thanks to everyone who responded!