Config: Rx) Inv (Inversion Functions) - Comtech EF Data CDM-570A Installation And Operation Manual

70/140 mhz satellite modem; l-band satellite modem; reduced chassis depth l-band satellite modem

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CDM-570A/570AL Satellite Modem with Optional Packet Processor

Front Panel Operation

The modem can operate with independent receive and transmit data rates. Even in this

configuration, where Rx data rate < > Tx data rate, the buffer's output clock is phase locked to the

transmit clock.

When you select Disabled, this disables the Plesiochronous/Doppler Buffer:

Rx Buffer: Disabled (Loop

Timing Mode)(▲ ▼, ENTER)

The modem then derives the receive clock from the satellite signal, and is therefore subject to

clock offsets relative to the local transmit clock. This is due, in part, to the originating clock being

slightly different from the local clock (a so-called plesiochronous offset), and to the motion of the

satellite (a Doppler offset).

(CONFIG: Rx) Inv (Inversion Functions)

Rx Inversion functions:

arrow keys to select Spectrum, Data, or Clock. Press ENTER. Typical for each

screen, use the

(CONFIG: Rx) Rx Inversion functions: Spectrum

Rx Spectrum:

(CONFIG: Rx) Rx Inversion functions: Data

Rx Data Sense:

(CONFIG: Rx) Rx Inversion functions: Clock

This feature is UNAVAILABLE when operating in CDM-570 Compatible Mode. See

Sect. 6.2 for further information.

Rx Data Sense:

arrow keys to select Normal or Inverted. Press ENTER.

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