anonymous, 02/19/2016 10:47 PM
E1 is definition of the physical interface used by the BTS,
and also the default type of interfaces used for higher
It is defined in ITU G.703, has 32 Channels, and is also
known as PMx or S2M Interface.
The specification is available at ITU[http://www.itu.int/rec/T-REC-G.703/e]