Config: Cnc  Search-Delay - Comtech EF Data CDM-625A Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625A Advanced Satellite Modem

Front Panel Operation

Below 64 ksymbols/sec: ±1 to ±(Rs/2) kHz, where:

Between 64 and 389 ksymbols/sec: ± 1 up to a maximum of ± 32kHz

Above 389 ksymbols/sec: ±1 to ± (0.1Rs) kHz, up to a maximum of ± 200 kHz

This range is pre-calculated and displayed in parentheses for reference.

CONFIG: CnC  Search-Delay

CnC Search Delay:

You may apply restrictions to the range of delay used by the search. This will reduce the time it

takes for the CnC algorithm to converge

Edit the Min or Max delay by using the

arrow keys to change that digit. Press ENTER.

During initial link testing, you should set Min delay to 240 ms and Max delay to 300 ms. Once

CnC finds the exact delay, you can further reduce the values, but you must take care to allow

sufficient range to accommodate changes in path delay due to Doppler.

When you are bench-testing CnC with two units in a back-to-back configuration, the

minimum delay should be set to 0 ms, and the maximum to 20 ms. This takes into

account the lack of satellite delay.

Rs=symbol rate in ksymbols/sec

(range 0-330ms)

arrow keys to select a digit. Then, use the

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