User Guide: PTP 600 Series
Ethernet bridging
phn-0896_012v000
Jul 2010
1-37
Quality of service for bridged Ethernet traffic
The PTP 600 Series supports eight traffic classes for Ethernet frames queued for
transmission over the wireless link. Ethernet frames are classified by inspection of the
Ethernet priority code point in the outermost VLAN tag.
PTP 600 provides a configurable mapping between Ethernet priority and traffic class,
together with a simple way to restore a default mapping based on the recommended
default in IEEE 802.1Q-2005. Untagged frames can be classified into any one of the
eight classes.
Scheduling for transmission over the wireless link is by strict priority. In other words,
a frame at the head of a given queue is transmitted only when all higher priority
queues are empty.
Fragmentation
The PTP 600 Series minimizes latency and jitter for high-priority Ethernet traffic by
fragmenting Ethernet frames before transmission over the wireless link. The fragment
size is selected automatically according to channel bandwidth and modulation mode of
the wireless link. Fragments are reassembled on reception, and incomplete Ethernet
frames are discarded.
Management network
IP interface
The PTP 600
OD
U contains an embedded management agent with a single IP
interface. Network management communication is exclusively based on IP and
associated higher layer transport and application protocols. The default IP address
of the management agent is 169.254.1.1 in the master ODU and 169.254.1.2 in the
slave ODU. The PTP 600 does not require use of supplementary serial interfaces.
MAC address
The management agent end-station MAC address is recorded on the enclosure. The
MAC address is not configurable by the user.
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