User's Guide

PTP 250 User Guide Ethernet bridging
phn-2182_003v004 (Oct 2011)
UNDER DEVELOPMENT
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. In t
hese figures, the layers have the
meanings defined in IEEE 802.1Q-2005.
Figure 1-10 Protocol layers between Ethernet and wireless interfaces