October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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Fig. 2.30. It starts with a preamble and a 1-octet start frame delimiter (SFD) to
signify the beginning of a frame.
7
The EPON standard makes use of the pre-
amble field with modifications to carry LLIDs for ONUs [9, Clause 65].
Each frame carries the destination and source MAC addresses, which are
both 6-octet fields. A 2-octet length/type field is used to represent the length of
the payload when its value is between 0 and 1500 (the maximum payload length).
When its value is between 1536 and 65,535, it is used to represent the type of
Ethernet frames. The use of this field to represent length and type is therefore
mutually exclusive. Ethernet frames ...
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