34
MDS TransNET 900 I&O Guide
MDS 05-2708A01, Rev. B
PWR [20–30]
This command displays or sets the desired RF forward output power setting
of the radio. The
PWR
command parameter is specified in dBm and can range
from 20 dBm through 30 in 1 dBm steps. The default setting is 30 dBm (1
watt). To read the actual (measured) power output of the radio, use the
SHOW
PWR
command.
In the USA, maximum allowable power is governed by FCC limits on
Effective Isotropic Radiated Power output (EIRP). The EIRP limit of
+36 dBm means that any user with a net antenna gain greater than 6 dBi must
decrease the
PWR
Section 3.5, How Much Output Power
contains a detailed discussion of this topic.
REPEAT [0–10]
The
REPEAT
command affects “downstream” data. The command causes a
Master or Extension to always repeat transmissions for the specified number
of times (range is 0 to 10; default selection is 3). Unlike the
RETRY
command,
there is no acknowledgment that a message has been received.
Use the
REPEAT
command without a value to display the current setting.
RETRY [0–10]
The
RETRY
command affects upstream data. The command selects, or
displays, the maximum number of times (0 to 10) that a remote radio will
re-transmit data. The default setting is 10.
This command is associated with ARQ (Automatic Repeat Request)
operation of the radio and is intended for use in areas with heavy radio
interference.
When the
RETRY
command is issued without parameters, the maximum
retransmission count is shown. A value of 0 represents no retries, while
values of 1 or greater successively improve the chance of data delivery in
spectrally harsh environments (at the expense of possibly increased latency).
The
RETRY
value is only setable at the Master. It is readable by a
synchronized Remote.
RSSI
This command displays the radio’s Received Signal Strength Indication in
dBm (decibels relative to 1 mW). The output can range from –40 dBm to
–120 dBm. Command availability and results depend on the mode of
operation (master or remote). The closer to 0 dBm, the stronger the signal,
thus a reading of –70 dBm is stronger than –80 dBm.
For a remote radio, under normal operation, RSSI is based on the average
signal strength of the SYNC message received in each of the eight frequency
zones. (RSSI is sampled each time a SYNC message is received.) When using
the RSSI reading to align a directional antenna, it is important to make
changes slowly so that the RSSI reading will provide meaningful results. It
will take several seconds to indicate a change in signal level. The radio stays
in RSSI mode until
is pressed.
ENTER
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