PTP 800 Series User Guide
1+ 1 Hot St andby link prot ect ion
phn- 2513_004v000 ( Oct 2012)
1- 67
Receive Diversity
Receive Diversity improves link availability by providing each end of a wireless link with
multiple observations of the signal which has been transmitted from the remote end of the
link. It is particularly effective in combating multipath fading caused by atmospheric
effects such as scintillation and ducting. Both these effects can occur to a significant
degree in microwave links. It also combats fading caused by reflections from water.
Receive Diversity can be enabled (at the CMU) in any of the supported 1+1 Hot Standby
configurations. When Receive Diversity is enabled, the Active CMU examines the quality of
the data which has been received from the wireless interface of both neighbour CMUs and
selects the best data on a byte by byte basis.
If separate antennas are installed at each end, then Receive Spatial Diversity is achieved.
Receive Diversity Ethernet frames
An important aspect of Receive Diversity is how the data received at the wireless interface
of the Inactive CMU arrives at the Active CMU. This is achieved by the Inactive CMU
encapsulating the received wireless data into Ethernet frames and sending the frames out
on the Data port at a constant rate. This requires that the Data ports and also the ports to
which they connect at the Ethernet switch are configured into a VLAN dedicated to
Receive Diversity Ethernet frames (
Figu r e 3 5
Receive Diver sit y Et hernet fram es
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 ...