User's Manual

Rapid Link Shutdown
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Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 2
set rls link monitor parameters [dn2up block errors per sample] [up2dn block errors per sample]
[dn2up # of samples] [up2dn # of samples] [dn2up sample time in msec] [up2dn sample time in
msec] [quick sample time]
Example: set rls link monitor parameters 2 4 5 2 1000 100 10
• If there are 4 or more block errors in 100 mS for 2 consecutive samples then invoke RLS
(“break”)
• If the 4 or more block errors occur within the first 10 mS (quick sample time) of the 100 mS
period, count it as a failure and immediately restart the 100 mS sample period.
• If 2 or less block errors occur in 1000 mS period for 5 consecutive samples revoke RLS
(“make”)
Note that the quick sample time parameter provides a quicker response to block errors if the block error
threshold occurs early in the configured sample time period. To disable the quick sample time feature,
configure its value the same as the “up2dn” sample time.
14.4 Settings for Advanced Mode
If the user requires a quicker RLS response, the Advanced Mode is recommended.
Note: When selecting Advanced Mode, both the “soft” failure mode (Basic mode parameters) and “hard”
failure mode (Advanced mode parameters) are to be configured.
14.4.1 RLS Signal Fault Settings
These settings correspond to “hard” failure mode The RLS signal fault settings are designed to detect
and react to brief bursts of extreme Rx Block error rates. The RLS signal fault detection and reaction
time is the quickest of the two RLS fault detection methods. RLS signal fault detection works with the
RLS signal degrade settings in Advanced Mode.
set rls signal fault parameters [detect time] [percentage erred blocks]
The RLS signal fault parameters command accepts two parameters:
• [detect time] is the time, in milliseconds, that the [percentage erred blocks] threshold
must be met to activate RLS.
• [percentage erred blocks] is the percentage of erred Rx Blocks required to invoke RLS.
For example, the command set rls signal fault parameters 1000 50 will activate RLS
when 50% or more of the Rx Blocks received in 1000 milliseconds are erred.
14.4.2 Recovery from a Hard Failure
Once a “hard” failure has caused an RLS activation, it uses the “soft” failure - RLS signal degrade
parameters – to determine the length of time to wait before reactivating the Ethernet ports.
14.5 RLS Link Control Settings
By default, the disabling and enabling of the data Ethernet port is automatically managed by the Horizon
Compact Plus system in response to detected RLS events. It is possible to enable manual control of
RLS shutdowns, so that the data Ethernet port remains shutdown until a user explicitly re-enables it.
There are two commands that make up RLS link control.
set rls link control [on/off]
To enable manual control of the data Ethernet port link state, set rls link control to on. The
default setting is off, allowing the Horizon Compact Plus to re-enable the data Ethernet port
once the RLS condition is cleared.