Ethernet Bridging; Ethernet Frames - Motorola PTP 48600 User Manual

User Guide: PTP 600 Series

Ethernet bridging

Ethernet frames

The PTP 600 series provides wireless Ethernet bridging between two fixed locations.
To be more precise, it forwards Ethernet frames as a two-port transparent
heterogeneous encapsulation bridge, meaning that each bridge forwards frames
between two dissimilar interfaces (Ethernet and wireless), encapsulating Ethernet
MAC frames within a PTP MAC frames for transmission at the wireless interface. A
link consisting of a pair of back to back bridges appears to the data network to be very
similar to a standard two-port Ethernet bridge.
The PTP 600 series provides eight traffic classes, classifying Ethernet frames into one
of eight prioritized queues based on inspection of the user priority field (802.1p) in a
customer (IEEE802.1Q) VLAN tag or provider (IEEE802.1ad) VLAN tag. Untagged
frames receive a default priority. The scheduling method is strict priority. The bridge
does not implement any VLAN functions for bridged frames apart from inspection of
the priority field, and consequently the bridge forwards tagged and untagged Ethernet
frames regardless of VLAN ID and without modification of any protocol header field.
The PTP 600 series supports a maximum Ethernet frame size of 2000 bytes for bridged
traffic.
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
Ethernet bridging
1-33