DragonWave Inc. 68
Horizon Compact Release 1.01.00 Wireless Ethernet Product User Manual – Volume 2
o Fast RLS switch for “hard” failure (severe degradation or link outage)
o Longer sample time and RLS switch for “soft” failure (high error rate)
• Increased flexibility in setting a larger differential for “break vs. make” error values
• Addition of a Receive Signal Level “RSL” threshold monitor to be optionally used in “make”
criteria for link startup
RLS Configuration
When RLS is enabled there are two options available for determining when RLS should be invoked to
shut down the Ethernet ports. These are the basic and advanced modes.
Basic Mode
In basic mode, the user can configure the modem-to-modem block error rate thresholds under which RLS
will be invoked and the Ethernet ports disabled. The user can also set the thresholds for which RLS will
be revoked and the Ethernet ports brought back to service. Complete link outages due to loss of Ethernet
connectivity, loss of RF path, hardware failure, or power failure will trigger an RLS event and the modem’s
Ethernet ports will be shut down until the outage is repaired.
The basic mode relies on the follow situations occurring:
“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. The value being monitored is Modem Receive Block Errors. RF link errors are typically
corrected by the modem and therefore no user data errors occur. The Modem Receive
Block Errors value is a true representation of user data errors occurring between the
modems.
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.
NOTE: It is recommended to use the Advanced Mode enhancements available in Release 4.5.
Advanced Mode
The advanced mode relies on any one of three situations occurring:
1. Link outage, which could be the result of link quality issues due to weather or path obstruction,
hardware failure, power or failure.
a. A link outage will trigger an immediate RLS condition.
2. “Hard” failure. This mode invokes RLS when the link has deteriorated to a point of a massive
amount of data errors being received over the link.
a. The RLS signal fault parameters correspond to “hard” failure mode.
b. The user-configurable error rates vary from 50% to 100%.
c. The user-configurable sample time ranges from 5 msec to 100 msec.
Example: 50% error rate over the link for a 100 msec time period will invoke RLS.
3. “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. The value being monitored is Modem Receive Block Errors. RF link errors are typically
corrected by the modem and therefore no user data errors occur. The Modem Receive
Block Errors value is a true representation of user data errors occurring between the
modems.
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.
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