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Vision Series Installation and Operating Handbook
PLEASE READ THE FOLLOWING INFORM ATION FOR FIRST-TIM E
SETUP OF A PAIRED CARRIER LINK.
In relation to Paired Carrier, generally there are no restrictions on how
the overlapped carriers are brought up and the satellite link is
established. How ever, the follow ing guidelines may be useful in proving
correct Paired Carrier operation as part of the overall initial link
deploy ment process. Once correct operation is established then Paired
Carrier can be switched on and off or reconfigured just like any other
modem feature.
1. Ensure Paired Carrier is switched off.
2. Bring up the first carrier (using the selected common trans mission
frequency) and
Check the receive signal level is as expected
•
Check the received signal at the second modem is data
•
transparent.
3. Sw itch the first carrier off.
4. Bring up the second carrier (using the selected common
transmission frequency) and
Check the receive signal level is as expected
•
Check the received signal at the second modem is data
•
transparent.
5. Bring up both overlapping carriers at the same time.
6. Check that the pow er level and frequency overlap are as expected.
7. Sw itch on Paired Carrier in both modems.
8. Check the modems lock to each other's signal and are data
transparent.
9. If the modems do not lock or are not data transparent then
Sw itch Paired Carrier off and on again in each modem (to
•
counter the possibility of a false lock)
If this does not work then sw itch the carrier itsel f off and on
•
again in each modem
Otherw ise check the general modem settings for correct
•
configuration and overlap of the tw o carriers (note that there
are restrictions on the supported level of power asymmetry
and symbol rate asy mmetry).
7-39
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