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M7/M7L/M7LT Modular Satellite Modem
Operation
M7/M7L/M7LT - Rev. 0.05
1-19
Figure 1-17 - Dual Interface Configuration I7 and G7
Figure 1-18 - Dual Interface Configuration E7 and G7
1.5.4.
Bit Rate Timing Options
The Modulator and the Demodulator each have four (4) possible sources for their bit rate timing.
These clock sources may be used in various ways in a system implementation to provide correct
timing at a destination. Each of the clock sources can be set either from the front panel or from an
external monitor and control system. Refer to Section 3.9 for details about these options and how to
configure the modem for each of these timing options.
1.5.5.
Data Interface Loop-Back Function
The standard and most optional interfaces also provide the data loop-back function. The data loop-
back can be controlled from the front panel or via remote control command. The data towards both
the terrestrial and satellite sides can be looped back individually by enabling this function via the front
panel or remote control
The data loop-back allows testing of the signal path connection up to the loop-back and back to the
source. Since both terrestrial and satellite sides of the signal path can be looped, the connection from
a local DTE can be checked on the terrestrial side while the connection from the far end DTE over the
satellite and through the modem can be checked on the satellite side. More information on use of the
loop-back modes is given in Section 4.3.
NOTE: Ethernet interfaces do not have this function.
CAUTION:
Enabling the “Data Loop-Back” functions will result in loss of traffic. It should not be
used in operating links without prior arrangements.
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