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Trango Broadband Wireless — Atlas5010 page 19
RF Link Loopback Test (linktest command)
The linktest command is the primary tool to assess the quality of the link when opmode is on. The linktest command
tests the throughput and packet error rate (PER) on the current channel for each direction at all speeds and reports results.
This command also provides RSSI for both ends of the wireless link. The command can be run from either the MU or
the RU. . The linktest uses FEC but does NOT use ARQ, so all errors on the link are reported. Throughput numbers
represent the absolute maximum bi-directional capacity including the management header (which is not available for
user payload) so actual user throughput measurements will be slightly less.
In running the linktest command the user must specify the modulation speed for each end of the link.
Command format: linktest <loc speed> <peer speed>
Valid modulation speeds are: 6,12,18,24,36,48, and 54 Mbps. Lower speeds will result in fewer dropped packets.
Example:
# linktest 24 24
local tx rate = 24 Mbps
peer tx rate = 24 Mbps
packet size = 1600 bytes
# of packets per period = 1000
# of Cycle = 10
0> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
1> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
2> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
3> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
4> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
5> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
6> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
7> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.00 Mbps
8> [tx] 1000 [rx] 1000 [rssi] -36 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
9> [tx] 1000 [rx] 1000 [rssi] -37 peer: [tx] 1000 [rx] 1000 [rssi] -40 -> 22.01 Mbps
--> [tx] 10000 [rx] 10000 [rssi] -36 peer: [tx] 10000 [rx] 10000 [rssi] -40
--> [Local PER] 0.00 % [Peer PER] 0.00 %
Success.
#>
In this example the linktest was run at 24 Mbps at each end of the link. The results indicated 10 cycles of 1000 packets
were transmitted and received from each end of the link without error. Actual achievable throughput is measured at 22
Mbps.