Redundant network control modem, Redundant linksync™ modem – Comtech EF Data MIDAS 4 System and Design User Manual
Page 70
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System and Design Manual, Revision 2
4–10
Network Management System
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As an option, a 1:1 redundancy can be provided for the Network Control
Modem to ensure continued network operation in case of failure. The
redundancy is provided via Comtech EFData’s SMS-301 Modem Protection
Switch. It can simultaneously switch data and IF, and can be ordered with
either independent or dependent switching of the modulator and the
demodulator.
When a fault is detected in the online modulator or demodulator, a switch to
the backup modem occurs, provided it is not in a faulted condition. The
transmit data is buffered and sent to the backup modem by the switch to
prevent false transmit fault indications. The actual switching is accomplished
within 20 ms, with programmable modulator and demodulator delays in the
range of 0 to 127 seconds.
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As an option, a 1:1 redundancy can be provided for the LinkSync™ Modem
to ensure continued network operation in case of failure. The redundancy is
provided via Comtech EFData’s SMS-301 Modem Protection Switch. It can
simultaneously switch data and IF, and can be ordered with either independent
or dependent switching of the modulator and the demodulator.
When a fault is detected in the online modulator or demodulator, a switch to
the backup modem occurs, provided it is not in a faulted condition. The
transmit data is buffered and sent to the backup modem by the switch to
prevent false transmit fault indications. The actual switching is accomplished
within 20 ms, with programmable modulator and demodulator delays in the
range of 0 to 127 seconds.