Comtech EF Data SLM-5650A Installation And Operation Manual page 483
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- User manual (154 pages) ,
- Installation and operation manual (420 pages)
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G.3.5
Carrier-in-Carrier Commissioning and Deployment
Prior to commissioning a Carrier-in-Carrier link, it is critical that the link is fully tested in non
Carrier-in-Carrier mode and all system issues including external interference, antenna pointing,
cabling, SSPA backoff are resolved. Only after the link is robust, should the user attempt turning
on Carrier-in-Carrier.
The following procedure is recommended for Carrier-in-Carrier commissioning and deployment.
Step
1
Turn ON the carrier at Site 'A'. Carrier from Site 'B' is OFF. CnC function is OFF at both sites.
2
Turn OFF the carrier at Site 'A'. Turn ON the carrier at Site 'B'. CnC function is OFF at both sites.
3
Using Co+No/No readings calculate PSD ratio at Site 'A' and Site 'B'. If it is not within specification,
make necessary adjustments to bring it within specification and repeat measurements in Steps 1
and 2.
Also verify that the RSL is within spec.
4
Without changing the transmit power levels, turn ON both the carriers (on the same frequency) and
turn CnC ON.
5
Repeat the test for different PSD ratio and Eb/No.
Appendix H
a.
Using a spectrum analyzer, measure Co+No/No at the input to the modem at Site 'A'.
b.
Using a spectrum analyzer, measure Co+No/No at the input to the modem at Site 'B'.
c.
Measure/record Eb/No at Site 'B'. Make sure there is sufficient margin to account for CnC.
d.
Measure/record Receive Signal Level (RSL) at Site 'B'.
a.
Using a spectrum analyzer, measure Co+No/No at the input to the modem at Site 'A'.
b.
Using a spectrum analyzer, measure Co+No/No at the input to the modem at Site 'B'.
c.
Measure/record Eb/No at Site 'A'. Make sure there is sufficient margin to account for CnC.
d.
Measure/record RSL at Site 'B'.
a.
Measure/record Eb/No at Site 'A' and 'B'
b.
Measure/record RSL at Site 'A' and 'B'
c.
Compare Eb/No in presence of two over lapping carriers with CnC with Eb/No when only
one carrier was ON. Eb/No variation should be within spec for that modulation, FEC and
PSD ratio.
Task
G–17
SLM-5650A Satellite Modem
Revision 10
MN-SLM-5650A
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