Comtech EF Data CDM-625A - Page 484

CDM-625A Advanced Satellite Modem MN-CDM625A
CDM-625A ODU (Transceiver, BUC, LNB) Operation Revision 4
10–14
To enable FSK, on the top line use the ◄ ►arrow keys to select FSK, and then use the ▲▼
arrow keys to set control as On.
Press ENTER when done.
Once FSK is enabled, the modem attempts to communicate with the installed transceiver(s).
Once communications are established, the bottom line of the ODU: FSK-control screen updates
to show the attached – and therefore controllable via FSK – transceiver(s), as per the following
examples:
ODU Control: FSK=Off (Off,On)
ODU Type: CSAT (C/KST, 2CSATS) ()
ODU Control: FSK=Off (Off,On)
ODU Type: KST (C/KST, 2CSATS) ()
At this time, use the
◄ ►arrow keys to navigate to the bottom line, and then use the ▲▼
arrow keys to select (where appropriate), CSAT, 2CSATs, or KST.
Press ENTER when done.
• Sect. 10.3.3.3.3.1 ODU: FSK-control

CSAT
• Sect. 0 ODU: FSK-control

2CSATs (Redundant configuration)
• Sect. 10.3.3.3.3 ODU: FSK-control

KST
When the Tx frequency is L-Band – Communication with a ‘smart’ BUC is achieved using a low-
speed, half-duplex FSK link over the Tx IF port, with a carrier frequency around 650 kHz.
With FSK communication disabled, the ODU: FSK-control screen appears as shown here:
ODU Control: FSK=Off (Off,On)
ODU Type: None (due to Tx freq) ()
Use the
◄ ►arrow keys to select FSK control, and then use the ▲▼ arrow keys to set control as
On, and then press ENTER. Once FSK is On, the ODU type is fixed as “BUC” and the screen
appears as shown here:
ODU Control: FSK=On (Off,On)
ODU Type: BUC (due to Tx freq) ()
Sect. 10.3.3.3.3.4 ODU: FSK-control

BUC