User's Manual

DragonWave Inc.
52
Horizon Compact Release 1.01.01 Wireless Ethernet Product User Manual – Volume 1
11.12 Horizon Compact Throughput Doubling
Horizon units are capable of transmitting up to 400 Mbps. For higher data rates, an Ethernet switch that
supports link aggregation is required. Horizon can be configured as 2 units, each with their own separate
antenna, or the Dual Polarity Radio Mount (DPRM) can also be used to mount two systems to a single
antenna (see Figure 3-3). The DPRM allows both systems to transmit/receive simultaneously, one with
horizontal polarization and the other with vertical polarization, supporting load sharing or throughput
doubling (up to 800 Mbps) (see Figure 11-1)
Figure 11-1 DPRM and Throughput Doubling
11.13 Horizon Redundancy
The Horizon system can be configured for redundancy using two physical options. One option allows for
two separate Horizon units, each with its own antenna, and connected to an Ethernet switch configured
with a re-routing protocol. The switch is responsible for re-routing the data to the redundant stand-by unit
when a failure occurs. This option is termed the “two wire” option.
The second option has two Horizon units mounted on a Power Switch Radio Mount (PS RM) with the data
feed from a single connection to a switch. Switching traffic to the redundant stand-by unit is determined
and performed by the Horizon Compact system and not the connected switch. This option is termed the
“single wire” option.
The configuration steps for each option are different (see Volume 2 for more details).
11.13.1 BNC Connector
The BNC connector on the side of the Horizon Compact serves a dual purpose. It can be configured as a
source for field strength measurements during antenna alignment, or configured to provide a redundancy
switch signal to a second Horizon Compact system mounted close by. For redundancy, the BNC
connectors on both units are interconnected with a coaxial cable. Note that for redundancy to work, you
must ensure that the field strength option for the BNC connector is turned off (set alignment off).
When the Horizon system is configured for redundancy, a DC signal is presented at the BNC connector of
the unit normally carrying traffic . Since the BNC connectors on both units are interconnected, the DC
signal is passed to the stand-by unit. As long as the DC signal is present, then the stand-by radio is held