Letter of Credit Forum

HELLO!

CAN YOU PLEASE HELP ME FIND OUT WHAT DOES IT MEAN IF THAT CONDITION IS INCLUDED IN L/C :

 'TELEGRAPHIC TRANSFER UNDER L/C ALLOWED'"

I HAVE TO ISSUE SUCH L/C,  L/C IS PAYABLE: 90 DAYS AFFER B/L DATE, BUT HOW SHOULD I TREAT THIS CONDITION? DOES IT MEAN THAT I CAN EFFECT PAYMENT '"AT SIGHT"" BY CREDIT TRANSFER, OR WHAT??

AND THE OTHER: T/T DOES NOT ALLOWED??

THANKSA LOT!