User's Manual

Advanced Configuration Features
47
Horizon Compact Release 1.01.01 Wireless Ethernet Product User Manual – Volume 1
Frames destined for the 01-80-C2-00-00-xx MAC addresses are sent to the internal Queue. Examples:
STP, RSTP, MSTP LACP, Pause Frames, GARP (GMRP,GVRP), bridge broadcasts, OAM, LLDP, Port
based authentication are all sent to the internal Queue and are transmitted in an expedited fashion.
Other frames that the user determines must be treated in an expedited fashion, such as “keep-alive”
frames and MRP frames, must be assigned a CoS within the switch, then assigned to the appropriate
Queue within Horizon Compact.
11.4 Pause Frames
Pause frames are generated by the weaker (slower) link when its forward pipe gets full. Pause frames
inform the upstream device to “pause and stop sending traffic for a period of 5 msec”. When the Pause
Frame feature is enabled, Horizon Compact generates pause frames to the Ethernet switch when the
Horizon Compact receiving buffer hits the internally set threshold. The receiving buffer threshold is close
to 100 msec at GigE rate. At data rates lower than GigE, the data buffer will accommodate a lesser
amount of data. The Pause Frame feature can be used when CoS/QoS is enabled or disabled.
11.5 Horizon Compact Throughput Speed
When you purchase a Horizon Compact system you receive a unit capable of giving a throughput speed
of up to 400 Mbps. However, the actual throughput speed achievable for any given system depends on
the specific throughput speed key that you purchased with the system
You can upgrade your system to a higher licensed throughput speed (up to 400 Mbps) by purchasing an
upgrade key and reprogramming your system. Any upgraded system can be reconfigured to a lower
throughput speed as required, without losing the ability to return to the upgraded speed.
You may also downgrade a system to a lower licensed speed. A downgraded system may warrant a
refund of licensing fees. A downgraded system cannot be returned to its former higher licensed speed
without purchasing another licensed upgrade key.
11.5.1 Maximum Throughput Speed
The maximum throughput speed is determined by the Horizon Compact throughput speed key you
purchase, however, it is important to note that this is also determined by the Channel bandwidth
associated with the configured radio band, and the modulation scheme used. The channel bandwidth is a
function of the radio band, and the modulation scheme is automatically selected depending on the
desired maximum throughput. Configuring the Radio Band and System Mode of the system determines
the maximum throughput and hence determines the modulation scheme applied.
Note: if you set a System mode of hc50_110_16QAM, the 110 figure indicates the maximum throughput
speed capability of that mode. However, if your licensed throughput speed key purchased from
DragonWave is less than this figure, your system throughput will be limited to the purchased licensed
throughput speed. Table 11-1 shows the modulation schemes that are selected for various Operating
Modes when 23 GHz radio band with 50 MHz channel spacing is configured.
Table 11-1 Bandwidth Operating Mode and Modulation Scheme (50 MHz Channel bandwidth)
Operating
Mode
Modem Mode
Average
Packet
Throughput
(Mbps)
Max Tx
Power
SP/HP
Threshold
(dBm)
BER 10-6
SP/HP
Saturation
(dBm)
BER 10-6
HC50_67 QPSK 67 17/27 -81 -18
HC50_110 16QAM 110 14.5/24.5 -77/ -75 -20.5
HC50_171 32QAM 172 14/24 -72/ -70 -21
HC50_215 64QAM 216 12.5/22.5 -68 -22.5
HC50_271 128QAM 272 11/21 -62 -24
HC50_322 256QAM 323 11.5/21.5 -59 -24.5
HC50_371 256 QAM 372 9.5/NA -59 -25.5
HC50_364 256 QAM 364 ** NA/19.5 -59 -25.5