5-26
RedMAX Administration and Maintenance Guide
Redline Communications Inc. Confidential and Proprietary
Subscriber Unit
The subscriber unit provide statistics for its local configuration. Unlike the sector controller,
it has no knowledge of other devices in the sector. As such, if you are attempting to
troubleshoot a sector-wide problem, a sample of a subset of the affected subscriber units
will need to be taken in order to obtain an accurate picture of the sector as a whole.
The subscriber unit can only report the downlink conditions of a link. The sector controller
does not provide the subscriber with any report on uplink conditions, other than to specify
when a subscriber should increase or decrease its transmit power in order to satisfy the
Reference RSS requirements.
You can access these parameters on the Diagnostic Statistics page of the subscriber
unit‘s web interface. See “Monitoring Statistical Results Screens” on page 2-8.
.
Uplink/Downlink CRC
This is the number of CRC errors experienced on a given subscriber unit.
The uplink counters reset after each de-registration, while the downlink
counters only reset after a subscriber unit reboots. As such, before
performing any characterization of CRC totals or rate, it's advised that
you reboot the SS to synchronize the counters.High CRC rates are
normally a result of poor signal quality, and can also indicate
interference.
Tx Power
This value displays the transmit power of the given subscriber station. If
the value displayed is -64, then the subscriber station does not support
this feature. Often when signal levels are higher or lower than expected,
it is a result of the fact that the subscriber has reached its
maximum/minimum transmit power. This parameter can be used to verify
whether this is the case.
Table 5-7
AN100U/UX Statistical Parameters (continued)
Parameter
Description
Table 5-8
Subscriber Unit Statistical Parameters
Parameter
Description
RSSI
This is the received signal strength as received by the subscriber's PHY, and is
measured after internal amplification. It should always be within a few dBm of -16.
SnR
This is a measurement of the downlink signal quality received by the SS. The higher
the better. This value normally does not exceed 31dB. A value less than around 9dB
will likely result in link-loss.
