Snm-1000 node control modem, Applications – Comtech EF Data MIDAS 4 System and Design User Manual
Page 102
System and Design Manual, Revision 2
6–4 Traffic
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The MIDAS SNM-1000 Node Control Modem is an all-digital, integrated,
satellite modem and Demand Assigned Multiple Access (DAMA) controller.
Utilizing the latest digital signal processing techniques, it is designed to
provide maximum flexibility when used as the node controller in the
Bandwidth-on-Demand MIDAS system. The SNM-1000 is responsible for:
• Receiving the MIDAS messages on the outbound control channel, and
transmitting messages to the MIDAS Controller on the inbound control
channel.
• Monitoring and managing local resources under MIDAS Controller
control.
• Informing the MIDAS Controller of local configuration changes.
• Reporting channel status, events, alarms and Call Detail Records to the
MIDAS Controller.
• Accepting and processing requests for circuits from end users.
• Call setup and termination under MIDAS control.
• Local diagnostics.
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The MIDAS SNM-1000 is used as a dedicated node controller within MIDAS.
At the traffic node, it provides the interface to MIDAS and manages local
resources under MIDAS control. It performs circuit setup, termination, local
M&C, diagnostics, and reports call detail records to the MIDAS Controller.
The modulator, operating in burst mode, always remains tuned to the inbound
control channel. The demodulator, operating in continuous mode, always
remains tuned to the outbound control channel.
The SNM-1000 also provides the user port interface for requesting services
from MIDAS, installation, diagnostics, and for sending and receiving service
terminal messages.
All traffic requirements are met by external traffic modems, which operate in
continuous mode. The SNM-1000 is capable of managing up to 30 data and
video modems via the multi-drop EFBUS1 modem control interface.