F.3.3.3.3.1 Odu: Fsk-Control  Csat - Comtech EF Data CDM-625 Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625 Advanced Satellite Modem

To enable FSK, on the top line 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

ODU Control:

ODU Type: CSAT (C/KST, 2CSATS)

ODU Control:

ODU Type: KST (C/KST, 2CSATS)

At this time, use the

arrow keys to select (where appropriate), CSAT, 2CSATs, or KST.

Press ENTER when done.

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:

ODU Type: None

arrow keys to select FSK control, and then use the

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:

ODU Type: BUC

Sect. F.3.3.3.3.4 ODU: FSK-control  BUC

arrow keys to navigate to the bottom line, and then use the

Sect. F.3.3.3.3.1 ODU: FSK-control  CSAT

Sect. F.3.3.3.3.2 ODU: FSK-control  2CSATs (Redundant configuration)

Sect. F.3.3.3.3.3 ODU: FSK-control  KST

(due to Tx freq)

(due to Tx freq)

arrow keys to select FSK, and then use the

arrow keys to set control as