Trango Broadband : Essential Configuration and RF Testing Guide for Network Cards

Configuration RF Link Loopback Test (linktest command)

Yellow LED 1 : Begins blinking when RSSI is greater or equal to –90 dBm. On continuously at –85 dBm. This is the Leftmost LED

Yellow LED 2 : Begins blinking when RSSI is greater or equal to –80 dBm. On continuously at –75 dBm.

Yellow LED 3 : Begins blinking when RSSI is greater or equal to –70 dBm. On continuously at –65 dBm.

Yellow LED 4 : Begins blinking when RSSI is greater or equal to –60 dBm. On continuously at –55 dBm. This is the rightmost LED.

If no VALID MU or RU signal is detected the LEDs will not be on at all.

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	%
Trango Broadband Wireless — TrangoLINK-45				page 23