Hai vijay&raj,
Three types of LAPD configuring methodology used while using a single E1 in ERICSSON.
1.LAPD Concentration.
2.LAPD unconcentration.
3.LAPD Multiplexing.
In LAPD concentration 13 TRU’s can be used with a single E1.
In LAPD unconcentration 10 TRU’s can be used.
And in LAPD Multiplexing 15 TRU’s can be used.