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Thread ID: 87256 2008-02-14 09:23:00 Broadband Line Noise Woody (710) Press F1
Post ID Timestamp Content User
640284 2008-02-14 09:23:00 Recently gone broadband (Xtra) from Dial-up.
1. Is a low level constant hiss on phone normal even with filters on all outlets?
2. At times, an annoying intermittent crackle which is only there on cordless phones (x3).
This is not present on fax/phone.
My cordless phones operate on 2.4GHz. Could broadbandband line be interfering with RF operation of phones?
Reason I suspect that is that crackle is not present on ordinary phone.
Woody (710)
640285 2008-02-14 09:52:00 A hiss is not normal. Do you have a wireless router? That could do it to a cordless phone. Changing the channel of the router or of the phone would fix it in that case.

Also having three cordless phones plus a fax/phone connected along with the broadband modem may be too much of a load - you could check that by unplugging one or two phones and seeing if the noise goes away.
wiselark (12849)
640286 2008-02-14 09:54:00 Do you have a wireless router for your broadband. Then it is your cordless phones that are causing the problem. Both operate on 2.4, you may need to upgrade your phones. wmoore (6009)
640287 2008-02-14 10:02:00 Thanks Guys,
Not using wireless router and although there are three phones, only one is fed from an outlet - the other two are wireless slaves fed from the first.
Woody (710)
640288 2008-02-14 10:13:00 Have you tried switching the two slaves off anyway, or changing the phones' channels? wiselark (12849)
640289 2008-02-14 10:36:00 possible bad filter drcspy (146)
640290 2008-02-14 13:37:00 If you have Sky or a monitored Alarm have you put filters on those as well ? wmoore (6009)
640291 2008-02-14 18:33:00 I had a similar problem, noisy line and crackling.

It would not let me onto the net. I had to resort to picking up my phone and dialing someone (eg 123) and that seemed to "clear the line" and I was able to go to My Network Connections and Repair my connection.

I got a sparkie out and he replaced two of my jacks and fixed some faulty wiring on another one and I no longer get any hiss.

And my connection is much more reliable.

Regards

Digby
Digby (677)
640292 2008-02-14 22:30:00 We had a line tech come round who fed a line directly to our modem from a splitter at the front of the house. Result=No line noise and no need for filters. We were having massive connectivity issues, with the net dropping off for abour 30min each day. This seems to have fixed it. He turned up without anyone at the flat having called to ask for it, so I think it was all free, just a bit odd. Thebananamonkey (7741)
640293 2008-02-15 01:18:00 as already mentioned, no you should not have a hiss on your phone line. Cordless phones do however sometimes have problems, particularly if the base unit is too close to the modem. A faulty filter as mentioned is quite possibly the cause.

I would suggest you unplug everything but the main phone and the modem and see how that works, try different filters to see if one of them is at fault.
Then plug things back in one at a time and see if / when the noise comes back.

If you are not sharing a phonejack for broadband and a phone the modem does not need a filter, it's purpose is to stop the noise you describe on the phone.

The supplied plug-in type filters are relatively cheap devices and prone to failing / causing problems. Having a professionally installed splitter and dedicated broadband jackpoint is by far the most reliable & best performing option. These are a better class of filter for a start.

Finally, as someone else mentioned, sky and monitored alarms also use the phone line and require filtering. They are often poorly wired by installers not familiar with phone wiring and known to be a common cause of faults, sometimes causing broadband to drop off when they dial out. The splitter method also tends to fix problems associated with these.
dugimodo (138)
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