in one E1 i think more conv. can be supported.
as, one E1 can support idealy 15 TRX cards
that means 5 sectors(well we are not using 5 sectors but still assuming the ideal case)
in one sec. we have 8 slots in three cards and 7 slot in one card are used for traffic
so this much no. of calls can be supported by one E1.
if any other suggestions are there please welcome.