Vocality V200 User Manual page 106

Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02
Unit 0 is configured to accept the stable receive link clock from Modem 0, which is used
to clock data out of the Doppler buffer. This is turned around as the transmit clock
('RXC') and given back to modem as Terminal Timing. It is then sent over the satellite
link to Modem 1, which recovers the receive clock and outputs it to V200 Unit 1. Unit 1
is configured to accept this receive clock ('Ext'), to use it as the GC1 reference (GC1
source in Clocking menu) and then turn it around (Tx clock set to 'Rxc') and output it
back to Modem 1 as Terminal Timing ('TT'). Modem 1 sends this back via the satellite to
Modem 0 which recovers the receive clock and uses it to clock the Doppler buffer.
The programming of the clock references is essential to all tributary channels, since they
must use a clock reference to generate all local bit rates. In this example, the Global
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Figure 5-65 Data configuration settings Unit 0
Figure 5-66 Data configuration settings Unit 1