Comtech EF Data MIDAS 4 System and Design - Manual (Page 20)

System and Design Manual, Revision 2
1–6 Introduction
SNM-1001 Network
Control Modem
The SNM-1001 Network Control Modem is an integral component of the
MIDAS System, providing the control channel communication path between
the MIDAS Controller and the remote nodes.
The MIDAS Controller transmits commands to the remote nodes through the
SNM-1001, using a continuous, TDM, and outbound carrier. The remote
nodes send requests and status messages to the NMS using the slotted
ALOHA burst inbound channel. This inbound channel technology allows
multiple remote nodes to share a single inbound carrier.
SNM-1002
LinkSync
 Modem
The SNM-1002 is an integral component of the MIDAS System, providing the
LinkSync™ monitor and control communication between the NMS and the
MIDAS network..
LinkSync™ provides three sets of capabilities for the MIDAS network.
Automatic Frequency Control (AFC) For all modems within the network.
Power Management For all active traffic circuits within the network.
Circuit Disruption Capability Allows the NMS to terminate circuits between any two
internal traffic nodes in the network.
The SNM-1002 performs a critical roll for each of these three LinkSync™
capabilities.
Traffic Node
The traffic node provides the terrestrial interface for customer equipment to
access the network services and processes local requests for services under
MIDAS control. Multiple traffic nodes can be located at a remote site and
share the RF equipment.
MIDAS supports different traffic node configurations:
• Multi-channel traffic node
• Single-channel traffic node