AS
Mxxxx Series User’s Manual
Asia Pacific | EMEA | Americas
160
14. Frequently Asked Questions (FAQ)
Q
–
Does the ASM really evaluate each frequency individually?
A
–
Yes.
Each frequency is broken down individually and the Tx Forward Power, Tx VSWR and Rx Level is
displayed per-channel.
Q
–
Does the VSWR monitor function ignore nearby (12.5 KHz) off-frequency RF energy entering backwards
from other transmitting antennas (i.e. horizontally mounted antennas)
A
–
Yes.
The VSWR, like the Tx Forward Power, is measured in a channelised bandwidth. The high
directivity of the ASM directional coupler prevents Tx Forward Power from creating a Tx VSWR measurement
error also.
Q
–
What is the minimum channel spacing to maintain true channelisation?
A
–
The ASM can discern and measure 12.5KHz channel separation between Tx channels.
Q
–
Channel bandwidth is established per channel during setup, and these could be mixed bandwidths (i.e.
25KHz Analogue, APCOP25 Phase1, TETRA, DMR, etc.) in a single combiner. Can these each be measured
individually?
A
–
Yes.
Modulations and selected channel bandwidths can be mixed within a combiner with no issue as
modulation type is programmed by channel in the GUI. Channel bandwidth is automatically selected by the
modulation type chosen
– except FM where several channel bandwidths are available.
Q
–
Are alarms logged for future reporting and analysis?
A
–
Yes.
In firmware revision 1.92 and above, alarm events are stored in an Alarm Event Log which can be
viewed and downloaded as desired.
Q
–
Can alarms be sent to remote devices?
A
–
Yes.
Alarm events can be sent via SMTP (Email), SNMP (Northbound) traps, ASM relay outputs, or
(optional) SAM/CAM relay outputs to remote devices for monitoring. SNMP GET Summary Alarms can also be
polled if desired.
Q
–
How is the VSWR calibrated to the antenna?
A
–
The ASM accepts the cable loss of the tx feeder network and uses this to calculate the measured VSWR to
the top of the Tx antenna.
Q
–
Will calibration take into account different lengths, types, and losses of the cable?
A
–
Yes.
The coupling loss, cable loss, and any variable losses will be compensated out during calibration
.
Q
–
What is the minimum Tx forward power levels that can the monitored?
A
–
The ASM will measure down to -10 dBm and up to +60 dBm without any changes.
Q
–
Can a PC file be created and/or saved of the ASMs configuration?
A
–
Yes
.
A configuration file containing all of the ASM
’s parameters relevant to a site may be prepared
beforehand and easily uploaded to an ASM (locally or remotely via Ethernet port), simplifying the deployment
activities carried at a network site. This file is in easily editable text format for ease of use. In addition, multiple
configuration files can be stored within the ASM and activated when desired to cater for network re-frequencying
transitions, different network operating configurations, or to back up ASM configurations for site records, later
use, or convenient programming in the event of an ASM unit being exchanged.
Q
–
Can the ASM
monitor the site’s Base Rx frequencies?
A
–
Yes
. Rx Monitoring and Tx-Rx Antenna Isolation testing can be performed and results displayed.
