Comtech-ef-data MIDAS Version 4.X Basic Configuration Manuale Utente Pagina 62

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MIDAS 4.2 Basic Configuration, Rev. 1
2–28 Setup and Operation
The inbound control channel characteristics are summarized as follows:
Pre-assigned digital SCPC channel using TDMA.
Transmission is burst mode at 19.2 kbit/s, QPSK, FEC1/2.
Only one inbound control channel is supported.
Messages on the inbound control channel are contained in an HDLC
frame.
The nodes trigger the transmit off the trailing edge of the controller server
outbound transmissions.
As the inbound control channel operates in a contention mode, the node
waits for an HDLC level acknowledgment from the controller server on
the outbound control channel. A lack of acknowledgment leads to message
re-transmission after a random back-off..
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