Appendix N. Receiver and Transmitter Autostart
The VSAT can be configured to automatically restart tuning of the Forward Link after having lost the
Forward Link signal.
Likewise, on the transmitter side, the VSAT can be configured to automatically try to log on to the Hub
when the Return Link has been lost. The VSAT will not try to log on again (despite autostart being
enabled) if the VSAT has been explicitly requested to log off and remain logged off by the Hub (e.g.,
receiving ‗Logon denied‘ or ‗Transmit disable‘ in the unicast TIM).
The CLI commands for enabling/disabling auto restart of the RX and TX are:
dvb rx autostart <on|off>
dvb tx autostart <on|off|traffic>
The normal factory default setting is that both rx and tx autostart are set to disabled. Once the SatLink
VSAT has been correctly installed and commissioned by the Network Operator, it is convenient to enable
rx autostart and tx autostart as described in section 9.5.
When rx autostart and tx autostart are set to off (disabled), the VSAT will make one attempt to acquire the
Forward Link when issuing the CLI command dvb rx start. If this attempt fails, a new attempt must
be manually triggered by issuing the dvb rx start command once again.
When rx autostart is enabled and tx autostart is disabled, the VSAT‘s reaction to the CLI command dvb
rx start is to continuously attempt to acquire the Forward Link until it succeeds or is manually stopped
(using CLI command dvb rx stop). If the Forward Link acquisition succeeds, the VSAT will enter a
receive-only mode. Issuing the CLI command dvb tx logon will trigger the VSAT to attempt a single
log-on attempt. Upon failure, the dvb tx logon command must be manually entered again in order to
trigger a new logon attempt. Alternatively, the CLI command dvb tx autostart on can be used to
trigger the logon procedure and at the same time configure the VSAT to automatically retry to log on if
the logon attempt fails or the VSAT has been logged off for some reason.
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