Cambium Networks PTP 250, User Manual

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Ethernet bridging Chapter 1: Product description
1-24 phn-2510_002v000 (Mar 2012)
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:
x
Ethernet Port
x
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 10 . Protocol layers involved in bridging between external interfaces and the
management agent are shown in Figure 11 . In these figures, the layers have the meanings
defined in IEEE 802.1Q-2005.
Figure 10 Protocol layers between Ethernet and wireless interfaces
Wireless Port Ethernet 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