10G EPON LLID

The LLID field is two octets in length and replaces the last two octets of preamble. The LLID field is a
concatenation of the mode, logical_group_id and logical_link_id variables for the associated MAC.

The third and fourth octets following the SPD contain the mode, logical_group_id and logical_link_id values.

These values are acted upon differently for OLTs and ONUs.

If the device is an OLT then the following comparison is made:

a) the received mode bit and logical_group_id isare ignored.

b) if the received logical_link_id value matches 0x7FFF and an enabled MAC exists with a
logical_link_id variable with the same value then the comparison is considered a match to that MAC.

c) if the received logical_link_id value is any value other than 0x7FFF and an enabled MAC exists with
a mode variable with a value of 0 and a logical_link_id variable with a value matching the received
logical_link_id value then the comparision is considered a match to that MAC.

If the device is an ONU then the following comparison is made:

a) if the received mode bit is 0, the received logical_group_id value matches one of the
logical_group_id variables, and the received logical_link_id value matches the logical_link_id
variable then the comparison is considered a match

b) if the received mode bit is 1, the received logical_group_id value matches one of the
logical_group_id variables, and the received logical_link_id value doesn’t match the logical_link_id
variable, or the received logical_link_id matches 0x7FFF, then the comparison is considered a
match