Configuration

RF Link Loopback Test (linktest command)

In addition, these 4 LEDs shall flash ON for 2 seconds, then OFF for 2 seconds to indicate the 'factory reset' button has been activated and the reset successful.

ASSOCiation LED (green):

The ASSOC led blinks at the following rates:

-Once every second when unit is powered on but opmode is OFF.

-Twice per second while in opmode ON and scanning for an MU or RU.

-Solid after unit is associated with the RU or MU.

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

Mbps

local tx

rate

=

24

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.

Trango Broadband Wireless — Atlas5010

page 19