User's Manual

Preparing for Alignment

Horizon Compact Release 1.01.01 Wireless Ethernet Product User Manual – Volume 1

10.1 Signs of a Healthy Link

You can be confident that a link is properly aligned and free of problems if the following readings are

obtained during a Telnet or Web interface session with each end of the link :

• No alarms – use the CLI command get alarms and press Enter to return a list of current

alarms – should be none that cannot be explained by network status

• Received signal level (RSL) within ±3 dB of link budget figure in clear weather. Use the

CLI command get modem statistics and press Enter to obtain the RSL reading. The

Unchannelized power reading should be within 6 dB of the RSL reading. If the

Unchannelized power drops below -75 dB, then it is likely that there is no signal being

presented at the radio portion of Horizon Compact. Check alarms.

• Eb/No of 19 dB or higher – use the CLI command get modem statistics and press Enter

to display the Eb/No value

• Signal to Noise Ratio (SNR) of 24 dB or higher – use the CLI command get modem

statistics and press Enter to display the SNR value

• Equalizer Stress typically between 20 and 30, but never more than 150 - use the CLI

command get modem statistics and press Enter to display the Equalizer stress value

• Modem Block Error Rate 0.00e+00 – use the CLI command get traffic statistics and

press Enter to display the Modem Block Error Rate. Modem block errors are an

indication of loss of data frames. Note that there are residual modem block errors as a

result of the alignment process.

• Transmit power typically set at the maximum for the radio band used – use the CLI

command get transmit power and press Enter to return the configured transmit power

• All sections operational – use the CLI command get health and press Enter to return the

health status of all three sections of the system

The readings obtained using the CLI commands during a Telnet session can also be retrieved using the

Web interface. All items listed here are available on the left-hand pane of the Web interface and appear

on each Horizon web page.