SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 52 (160)
9.3 Line-up
Perform antenna and ODU installation and alignment as described in Appendix F and the initial
parameter configuration described in section 9.2 before proceeding with the procedures described here.
9.3.1 Forward Link Acquisition
Connect the RX cable between the ODU and IDU (if not already connected). Verify that the RX power
level is between -25 dBm and -65 dBm at the input of the IDU.
If the antenna, ODU, and forward link parameters have been set correctly (section 9.2.1 - Antenna and
ODU Parameter Configuration, and section 9.2.3 Forward Link Parameters) and the IDU RX power level
is as specified above, the STM SatLink VSAT is ready to acquire the forward link:
1. If not already logged on, start the STM SatLink VSAT and login as installer (user = install, factory
default password = dvbrcs) after having seen the message
Starting DVB interface.
2. Enter the CLI command
dvb rx start to acquire the forward link.
3. The CLI message
Forward Link up is displayed on the CLI output after successful acquisition of
the forward link
The reader is referred to Appendix O for a description of the steps performed by the SatLink VSAT when
acquiring the forward link.
If the STM SatLink VSAT reports RX tuning failed please check the following:
• ODU parameter setting – section 9.2.1
• Forward link parameter setting – section 9.2.3
• That the RX cable is properly connected to both the STM SatLink VSAT and the LNB
• That the signal level in to the IDU is between -25 dBm and -65 dBm
• That the antenna/ODU has been properly aligned (both antenna pointing and polarization adjustment
correct)
To ensure good performance (less than one error event at MPEG2-TS level per hour) for the forward link,
the SNR value, reported using the dvb rx show command, shall be verified to be at a minium level
before line-up is completed. If, after repeated antenna/ODU alignment, the minimum SNR value is not
obtained, the system operator/service provider shall be contacted.
Non-rainy weather conditions will normally be required to obtain the minimum SNR value.
If the minimum SNR value has been provided by the system operator/service provider, the reported SNR
shall be verified against the provided value. If the minimum SNR value has not
been provided by the
nework operator, the minimum SNR value is found as follows:
For DVB-S2 operation:
Read the MAX MODCOD SNR Threshold value by executing the dvb rx show command and
subtract 0.5 dB
to get the minimum SNR value.
If the SatLink VSAT does not
display the MAX MODCOD SNR Threshold value when executing the
dvb rx show command (network dependent), the minimum SNR values specified in Table 6 below
apply.
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