User guide

SATELLINE-3AS NMS / NMS Epic / NMS 869 / VHF
User Guide, Version 1.0
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3.5
Requirements for the user system
SATEL NMS fits the systems that are:
• Single master systems with point-to-multipoint network structure
• Based on polling protocol (the master polls the slaves regularly)
• Transferring user messages not larger than 1kByte
Other kinds of systems may also be possible but require careful consideration; in such cases
the customer is advised to contact SATEL for more information.
Repeater stations are fully supported. While operating the monitoring system, radio data links
are transparent. Because NMS data is invisible to the user’s system, most user protocols are not
interfered by NMS. However, note that on-line NMS always affect the real time operation of any
system due to the extra information transferred. In some cases this means that the parameter
defining the timeout of the slave station reply must be increased. Depending on how much NMS
information is required, NMS introduces an extra load of ~20…60 bytes per a message.
3.6
Designing Systems and Networks
The Routing window of SATEL NMS PC software provides a graphical tool for designing the
radio network. It is used by simply dragging and dropping modem icons on the sheet and
linking the modems and finally uploading these settings to individual modems.
The designing of any radio modem system requires very precise planning. Once the choices
between devices, their locations, installation, maintenance etc. are clear, the project file for the
system can be implemented by using SATEL NMS PC software. Please refer to the SATEL NMS
PC User Guide for more detailed description.
Please check also the chapter “2.6 Settings” before changing any settings of the radio modems .
Configure the radio modems accordingly using SATEL NMS PC. Finally, when all the radio
modems have correct settings, they are ready for further installation.