Showing posts from March, 2015

Troubleshooter's Guide - Frequent disconnections in MTNL Broadband

When I learnt last month that I am eligible for one of MTNL's 8 mbps plans, I upgraded with lots of excitement. But the last 30 days have been a nightmare.

The connection goes down literally every 4-5 minutes, and comes back up on its own after a few minutes. These casual brief disconnections play havoc with the usability of the internet, especially with large downloads. I could literally do nothing on my 8 mbps broadband (yes, I was getting that speed till the modem, despite MTNL's initial apprehension that I could not get it, being more than 1 km away from the exchange).
I did some research and figured out two things
1) I have a noisy line (literally, it makes a lot of noise) 2) The broadband line drops are related to a low SNR/ noise margin. SNR (Signal to Noise Ratio) compares the level of the signal with the amount of inteference. A higher value is desirable. A lower SNR means a more unstable line. There is also a relation between line speed and SNR. At a lower speed, the SNR…