Copyright RF Industries Pty Ltd 2014. Subject to change without notice.
rfiwireless.com.au
6
Copyright RF Industries Pty Ltd 2014. Subject to change without notice.
rfiwireless.com.au
7
Adjacent Sites-Monitoring
If an ASM is installed at a dominant network site, it can
also be configured to ‘off-air’ monitor channels from
surrounding network sites. In trunking networks, this is
particularly useful for monitoring a control channel from
adjacent sites.
This concept requires adequate isolation between the
ASM site’s Tx antenna and the off-air Rx antenna and
provides basic monitoring of coverage - yet confirms the
continuing operation of other sites within the network.
Adding more ASMs to other sites adds more data,
providing more than one signal level reading from each
site – more thoroughly confirming network and coverage
performance.
Multiple sites’ data can also be collected, collated and
presented to identify performance impacting changes in
network coverage performance.
Other site users’ transmitters may also be monitored
by entering them as frequencies in the Rx Frequency
screens of the GUI. This monitoring method allows those
other frequencies to be measured and logged, providing
level and co-incidence data for a period of time.
This is particularly useful in assisting the tracing of
intermodulation mixes when other site users’ transmitters
are suspected of involvement.
Suspected frequencies can be entered in spare Rx
channel positions, with the ACT indicator showing the
simultaneous keying of monitored frequencies. The
ability to assign “detection” (alarm) thresholds to these
measurements allows alarm notifications to be triggered.
Time and data stamped ASM History logs and the ability to
view this activity remotely via the GUI provides additional
fault-finding capabilities to assist in the resolution of site
performance issues.
Base Station Failure
When fitted with an (optional) Site Alarm Module (SAM),
the ASM can provide Base Station monitoring in DMR
(and other) radio systems. The alarm status from each
monitored channel can be assigned to a SAM relay output,
and a failure on a base station channel can create an alarm
output that is connected back to the trunking controller or
individual bases to de-allocate the failed channel.
Using the “Digital Input” affiliated to each SAM relay output
ensures that the trunking base station’s keying is monitored,
and a total RF output failure is recognised – rather than
interpreted as valid “no channel activity”. SAM outputs can
also be manually activated and de-activated via the GUI if
the deactivation of one or more channels is desired.
Site Equipment Monitoring
When fitted with a Site Alarm Module (SAM), the ASM can
also provide monitoring of temperature, analogue voltages
and test points, and general purpose digital logic and alarm
lines.
The alarm status from each input is represented in the
webserver GUI, and alarm events trigger SNMP traps,
SMTP (Email) messages and Manager Messages for alarm
reporting.
A selection of temperature, analogue voltages and digital
logic levels can be monitored by one SAM, with ten (10)
alarm relay outputs that can be mapped to any ASM
monitored channel’s alarms. Up to ten (10) SAM’s can be
connected to one ASM for additional monitoring capacity if
required.
