Customer Review

3 of 4 people found the following review helpful
2.0 out of 5 stars Slow sync on BT Infinity 2, Echo on PSTN, 15 July 2012
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This review is from: AVM Fritz! Box Fon 7390 Wireless 4 Port VDSL/ADSL2+ Router DECT VoIP Phone Adaper (Accessory)
I have asked Amazon for a return of this item today. Either it is faulty or it's not ready for the UK Market yet.

I have a number of issues with this unit as listed below.

Sync speed slower than the BT Openworld modem. I could get 80/20 using the openworld modem and only 66/20 with this fritz!box. My speedtest lowered considerably because of this :(. Plugged the BTO modem back in and synced back up to maximum speed straight away.

Probably a more worrying issue was phantom calls. After about 12am at night I would get a few phantom calls. No-one there, just a silent line. Wife not impressed!

Then there was some line echo. All PSTN calls had some echo to varying degrees. Mainly you could hear your own voice when speaking as an echo. Again very annoying.

I have re installed my BTO modem and EA3500 until either AVM sort out the issues in a firmware release or bring out a new model. This item definitely has potential, it's just to buggy and without build quality to match the price.

All of these issues can be found by googling, some have been going on for over a year by the looks of things :(

Good luck
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Showing 1-1 of 1 posts in this discussion
Initial post: 10 Oct 2012 13:42:48 BDT
Last edited by the author on 10 Oct 2012 17:14:09 BDT
JonD says:
The phantom calls would be due to BT's routine night-time line testing. I think the problem is that the implementation of the analogue telephone interface on the Fritz!Box is poor. A ringing detector in a piece of Terminal Equipment should look for the presence of the 25Hz a.c. ringing signal before announcing an incoming call, and perhaps monitor the d.c. state of the line during silent period of the ringing cadence to confirm that the incoming call is still there. The Fritz!Box doesn't seem to rely on detecting 25Hz a.c. as any disturbance to the d.c. state of the line starts the phones ringing. So BT's line testing or just using another phone connected in parallel with the Fritz!Box on the exchange line will set the Fritz!Box phones ringing. I have a Message Waiting unit that regularly goes on-line to check for stutter dial tone from the BT Answer 1571 service. That set all the Fritz!Box phones ringing once every hour.
I believe BT will stop the routine testing of your line if requested, but the real solution is for AVM to sort out the Fritz!Box.
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