Mocomtech CDM-QX Config„Tx„Inv TX Inversion Functions, Tx Spectral Inversion Normal Inverted

CDM-Qx Satellite Modem	Revision 5
Front Panel Operation	MN/CDMQx.IOM

Internal indicates that the CDM-QX will supply a clock to the DTE, which is derived from its internal high-stability source.

External indicates that the CDM-QX expects to receive a clock from the DTE, to which the unit can phase-lock its internal circuits. (If G.703 is selected as the Interface type, the software will force the clock mode to External.)

Loop- indicates that the transmit timing source should be the receive clock, from the

Timed direction of the satellite. This is a useful mode, in that no external connection needs to be made in this mode. If the demodulator loses lock, or if there is no receive signal present, the internal clock is substituted. Note also that this mode will work even with asymmetric Rx and Tx data rates.

ExtLoop Indicates that the CDM-Qx expects to receive a clock from the DTE, which is derived from the received clock from the direction of the satellite. This is useful in CnC mode with G.703 interface wherein the remote station is relying on a centralized clock from the hub station.

(Config„Tx„Inv) – TX INVERSION FUNCTIONS

Tx Inversion functions:

Spectrum Data Clock (◄ ►,ENT)

Select Spectrum or Data Clock, using the ◄ ► arrow keys, then press ENT.

If Spectrum is selected, the following sub-menu will be displayed:

Tx Spectral Inversion:

Normal Inverted (◄ ►, ENT)

Select Normal or Inverted, using the ◄ ► arrow keys, then press ENT.

If Data Clock is selected, the following sub-menu will be displayed:

Tx Data Sense:	(◄ ►, ENT)
Normal Inverted

Select Normal or Inverted, using the ◄ ► arrow keys, then press ENT.

If Clock is selected, the following sub-menu will be displayed:

Tx Clock Inversion:	(◄ ►, ENT)
Normal Inverted

5–23