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【多选题】
关于GEM帧和T-CONT，下面哪些说法是正确的？A.
PON口下的多个ONU可共用一个GEM Port ID
B.
多个GEM port可映射到一个T-CONT中
C.
Alloc-ID由ONU分配
D.
OLT同一GPON端口下的ONU不存在Alloc-ID相同的T-CONT
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