October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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2.7.9 Ethernet OAM Sublayer
Besides standardizing the EPON technology, another charter of the IEEE
802.3ah task force was to develop the OAM sublayer for Ethernet. The OAM
ONU 1
PS
ONU 2
ONU 3
MACMACMAC
RS (P2PE)
PHY
ONU 1
PS
ONU 2
ONU 3
MACMACMAC
RS (P2PE)
PHY
OLT
0 & LLID = 1
0 & LLID=1
0 & LLID=1
0 & LLID=1
0 & LLID=1
0 & LLID = 1
0 & LLID = 1
0 & LLID=1
0 & LLID = 1
ONU
ONU
Downstream
Upstream
Figure 2.39 EPON point-to-point emulation operation.
EPON PHY
RS (P2PE)
SCB
MAC
Bridge (802.1D)
Router/Server
MAC
3
MAC
2
MAC
1
EPON PHY
RS (P2PE)
ONU MAC(s)
Router/PC
OLT ONU
Figure 2.40 Point-to-point and single-copy broadcast (SCB) MACs in an EPON model.
68 PON Architectures Review
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