Comtech EF Data CDM-Qx, Инструкция по установке и эксплуатации

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CDM-Qx Satellite Modem Revision 6
Front Panel Operation MN/CDMQx.IOM
(Config
%
Tx
%
Clk) – TX CLOCKING MODE
Tx Clocking Mode: Int Ext
Loop-Timed ExtLoop ( ◄ ► , ENT)
Select
Int
(Internal),
Ext
(External) or
Loop-Timed
using the
◄ ►
arrow keys, then
press
ENTER
.
Tx Clock Inversion:
Normal Inverted ( ◄ ► , ENT)
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-Timed
Indicates that the transmit timing source should be the receive clock, from the
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
ENTER
.
Selecting
Spectrum
displays the following submenu:
Tx Spectral Inversion:
Normal Inverted ( ◄ ► , ENT)
Select
Normal
or
Inverted
using the
◄ ►
arrow keys, then press
ENTER
.
Selecting
Data Clock
displays the following submenu:
Tx Data Sense:
Normal Inverted (
◄ ► , ENT)
Select
Normal
or
Inverted
using the
◄ ►
arrow keys, then press
ENTER
.
Selecting
Clock
displays the following submenu:
5–20