gsm This topic has 2 replies, 1 voice, and was last updated 13 years, 7 months ago by Jason. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts 29th May 2011 at 17:57 #66497 abdullahGuest plzzz anybody till me why we use -48, -24,-12 voltage in gsm..and what is different between them? 1st June 2011 at 21:05 #66498 MilonGuest GSM channels 3rd June 2011 at 11:35 #66499 JasonGuest I thought that the old land line equipment used this and it was a carry over from those days. `Jason Author Posts Viewing 3 posts - 1 through 3 (of 3 total) The forum ‘Telecom Design’ is closed to new topics and replies.