Config) Carrier-In-Carrier: Search-Delay; Config: Mask - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation

5.2.2.1.6.2 (CONFIG) Carrier-in-Carrier: Search-Delay

CnC Search Delay:
To reduce the time taken for the CnC algorithm to converge, the user can restrict the range of
delay the search uses. Factory default values for satellite operation are set to a minimum of 230
ms and a maximum of 290 ms. Once CnC has found the exact delay the value can be further
reduced, but care should be taken to allow sufficient range to accommodate changes in path delay
due to Doppler.
If CnC is being bench-tested 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.
IMPORTANT
To edit the CnC Search Delay: Use the
using the arrow keys, and then edit the value of each digit by using the
ENTER when done.
5.2.2.1.7

CONFIG: Mask

Masks: RxAGC
Select RxAGC, EsNo, Reference, or DeCompInv using the
ENTER.
For the RxAGC and EsNo submenu selections, three masking options are available. Using the
RxAGC submenu as an example:
Rx AGC Mask:
Select Alarm, Fault, or Mask using the
the previous menu. Note the following:
Mask Type Description
Alarm Alarms can be viewed from the Monitor: Live Alarms menu (Sect. 5.2.2.3.1). Alarms cause the
Unit Status LED to turn AMBER.
Fault Faults can be viewed in the Stored Events Log (Sect. 5.2.2.3.2). Faults cause:
Mask Masking the event has the effect of ignoring the event – it can no longer be logged and is not seen in
any menu.
Min: 010 ms
◄ ►
EsNo
Alarm Fault
• The Unit Status LED to turn RED
• The J1 Alarm Connector to show a Fault
(range 0-300ms)
Max: 290 ms
arrow keys to select the Min or Max delay digit to edit
Reference DeCompInv
Mask
◄ ► arrow keys, and then press ENTER to return to
5–23
MN-CDM750
(34v)
arrow keys. Press
▲ ▼
◄ ►
arrow keys, and then press
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