User's Manual

PTP 250 User Guide Ethernet bridging
phn-2182_002v000
May 2011
1-25
Protocol model
Ethernet bridging behavior at each end of the wireless link is equivalent to a two-port,
managed, transparent MAC bridge where the two ports are:
• Ethernet Port
• Wireless Port
Frames are transmitted at the Wireless port over a proprietary point-to-point circuit-
mode link layer between ends of the link. Ethernet frames received at the Ethernet
port, or generated internally within the management agent, are encapsulated within a
lightweight MAC layer for transmission over the wireless link.
Protocol layers involved in bridging between Ethernet and wireless interfaces are
shown in Figure 1-10. Pro
tocol layers involved in bridging between external interfaces
and the management agent are shown in Figure 1-11. I
n these figures, the layers have
the meanings defined in IEEE 802.1Q-2005.
Figure 1-10 Protocol layers between Ethernet and wireless interfaces
Wireless PortEthernet Port
IEEE 802.3
Media Access Method
Independent Functions
Media Access Method Dependent
Convergence Functions
Media Access Method
Specific Functions
Ethernet Wireless
PTP Medium Access
Method
PTP Physical Layer
MAC Relay Entity