Node, Node components – Comtech EF Data MIDAS Version 4.X Basic Configuration User Manual
Page 21
MIDAS 4.2 Basic Configuration, Rev. 1
Getting
Started
1–7
Node
A MIDAS network node:
• Provides the interface for user traffic.
• Manages local resources in cooperation with the Controller Server.
A node can be located at a remote site, or at the controller server site. Multiple
nodes can be located at a remote site and share the RF equipment. As stated
previously, one or more nodes located at the controller site can share the RF
equipment.
Node
Components
A MIDAS node may consist of:
• SNM-1000 Node Control Modems, each controlling from 1 to 30 traffic
modems
• SNM-1010 Data/Control Modem, which serves as both the node control
modem and traffic modem
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The SNM-1000 Node Control Modem performs as a dedicated node
controller. At a traffic node, it provides the interface to the controller server
and manages local resources under controller server control. It executes circuit
setup and termination, provides local M&C and diagnostics, and reports call
detail information to the controller server.
The SNM-1000 can manage up to 30 data modems.
For detailed information on the SNM-1000 Node Control Modem, refer to the
SNM-1000 Node Control Modem Operation and Maintenance Manual.
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The SNM-1010 Data/Control Modem provides both control and traffic
functions, switching between the two modes as required. The unit is used at
sites that require single-channel data connectivity.
In control mode, the SNM-1010 provides the interface to the controller server.
The modulator (operating in burst mode) is tuned to the inbound control
channel; while the demodulator (operating in continuous mode) is tuned to the
outbound control channel.
To originate or receive a call, the SNM-1010 switches to traffic mode. While
carrying user traffic, the modem operates in continuous transmit and receive
mode. It supports data rates from 2.4 kbps to 5.0 Mbps.