User's Manual

DragonWave Inc.
80
Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 2
Example: Configuring 50% error rate over the link for a 100 mS time period will invoke RLS if
the error rate equals, or exceeds, 50% over a period of 100 mS.
2. “Soft” failure. This mode monitors the link for data errors either as a steady state error rate or
bursts of data errors.
a. The RLS signal degrade settings correspond to “soft” failure mode.
b. Minor modem block errors can be corrected by the modem. This correction is invisible
to the user and is not traffic affecting. The Rx Blocks Error counter indicates
uncorrectable errors in the modem block stream over the air. Modem blocks may, or
may not, contsain user/payload data. The counter is a true representation ov over-the-
air data performance, even when there is no user data present.
c. The sample time is user configurable
d. An RLS signal degrade threshold setting in percentage is available to allow shorter
sampling times should errors occur on a frequent basis.
While monitoring for a “soft” failure, any “hard failure” will invoke RLS immediately.
Note: When selecting Advanced Mode, both the “hard” failure mode and “soft” failure mode are to be
configured.
14.3 Settings for Basic Mode
Basic mode relies on RLS link monitor parameters consisting of errors in data transfer between the
modems. It monitors Rx Block errors and the user configures the number of errors and sampling time
for those errors for both the invocation and revocation of RLS.
14.3.1 RLS Signal Degrade Settings
These settings correspond to “soft” failure mode.
The following command sets the minimum RSL value that will re-establish, or “make”, the link.
set rls make rsl [RSL Threshold (dB)] [Sample Period (sec)]
Example: set rls make rsl -60.0 100
When the RSL level is maintained at -60.0 or a higher value (less negative) for the duration of the
sample period (100 seconds), the link will be re-established, provided that there are no other existing
“soft” or “hard failures”
Setting the RSL sample period to zero (0), the default value, disables this feature.
14.3.2 RLS Link Monitor Parameters
This CLI only command provides a custom method for the configuration on the “soft error” monitor. The
method directly configures the sampling period, required repeated consecutive samples and the erred
block thresholds per period of the “soft error” monitor. This method allows additional low-level tuning of
the “soft error” monitor.
The RLS link monitor parameters are a measure of the number of block errors per designated sampling
time period. The user configures the RLS settings for:
the number of desired block errors required in order to invoke, or revoke, RLS
the number of samples in which the block errors occur
the sampling time in milliseconds
a “quick” sampling time that determines a fail condition if the block error threshold is
exceeded before the down sample time period times out
The following command configures the link monitor parameters: