PTP 800 Series User Guide
Et hernet bridging
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Quality of service for bridged Ethernet traffic
The PTP 800 Series supports eight traffic queues for Ethernet frames waiting for
transmission over the wireless link. Ethernet frames are classified by inspection of the
Ethernet destination address, the Ethernet priority code point in the outermost VLAN tag,
the Differentiated Services Code Point (DSCP) in an IPv4 or IPv6 header, or the Traffic
Class in an MPLS header.
PTP 800 provides a configurable mapping between Ethernet, IP or MPLS priority and
transmission queue, together with a simple way to restore a default mapping based on the
recommended default in IEEE 802.1Q-2005. Untagged frames, or frames with an unknown
network layer protocol, can be separately classified.
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 800 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. Traffic is not fragmented in the highest priority traffic class.
Management network
IP interface
Each PTP 800 CMU 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. The PTP 800 does not require use of supplementary serial interfaces.
In a 1+1 protection scheme, each CMU contains a separate management agent.
MAC address
The management agent end-station MAC address is recorded on the underside of the
enclosure. The MAC address is not configurable by the user.
Summary of Contents for PTP 800 Series
Page 1: ...Cambium PTP 800 Series User Guide System Release 800 05 02 ...
Page 40: ...Licensing requirements About This User Guide 10 phn 2513_004v000 Oct 2012 ...
Page 232: ...Limit of liability Chapter 3 Legal information 3 22 phn 2513_004v000 Oct 2012 ...
Page 322: ...Radiation hazard assessm ent Chapter 4 Reference information 4 90 phn 2513_004v000 Oct 2012 ...
Page 428: ...Replacing IRFU components Chapter 5 Installation 5 106 phn 2513_004v000 Oct 2012 ...
Page 630: ...Using recovery mode Chapter 7 Operation 7 78 phn 2513_004v000 Oct 2012 ...