nuclearcat wroteMight be everything of all, noise of powerlines, appliances connected to it (most shitty stuff sellers getting to Lebanon has no certifications), even just shitty triac water heater can make power line noisy as hell.
Interference is terrible thing.
Once wifi rates in apartment was dropped due crappy CFL lamps owner installed.
Another example, critical site in one of exUSSR countries, we had to sweep one city block to find old guy with malfunctioning TV that was causing interference to huge satellite dish 8km away.
Did you try following things:
1)Put modem in box with small UPS (maybe DC ups, if u will find it)
2)Get with laptop to telephone cables box, find yours
3)disconnect telephone wires going to apartment
4)connect to box, your telephone wires, check speed
5)just connect back wires to apartment, check speed
Did you try following things:
1)Put modem in box with small UPS (maybe DC ups, if u will find it)
Modem connected to online sinewave UPS
2)Get with laptop to telephone cables box, find yours
I have the wire labeled by Ogero tech.
3)disconnect telephone wires going to apartment
Disconnected now from the box.
4)connect to box, your telephone wires, check speed
Almost same attenuation, 0.6 dB difference.
5)just connect back wires to apartment, check speed
OK so it looks like the telephone line is not to blame. It's the telephone box that is experiencing some kind of interference.
Today at 9 AM, i waited for the power outage and checked the attenuation at the telephone box in the building.
8 :59 AM : Attenuation 22 dB ( EDL )
9: 00 AM : Power outage for 1 minute before generate kicks in - Attenuation 13 dB
9: 01 AM : Generator online - Attenuation 22 dB
So back to square one and yeah, 9 dB interference is f****ng a lot.