A.The optical power received by the ONU is less than the sensitivity value

B.The optical power received by the ONU is greater than the overload optical power.

C.The ODN line is too long and exceeds the online distance set by the system.

D.There is abnormal attenuation on the ODN line.

A.igmp profile

B.igmp program

C.Multicast VLAN

D.igmp user

A.pub,pri

B.common, secret

C.public,private

D.read,write

A.admin/admin

B.root/admin

C.root/root

D.admin/root

A.Both GPON and EPON use single-fiber bidirectional data transmission. EPON uses 1490nm downstream wavelength to transmit data, and GPON uses 1550nm downstream wavelength to transmit data.

B.The GPON protocol standard was proposed by IEEE, and the EPON protocol standard was proposed by ITU-T

C.GPON provides higher downstream bandwidth

D.GPON uses the extended OAM protocol to manage ONUs