SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 158 (160)
Appendix N. Receiver and Transmitter Auto start
The STM SatLink 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 STM SatLink 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
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 STM SatLink 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 STM SatLink 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 modus. 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 log-on attempt. Alternatively, the CLI command
dvb tx
autostart on
can be used to trigger the log-on procedure and at the same time configure the VSAT to
automatically retry to log-on if the log-on attempt fails or the VSAT has been logged off for some reason.
The CLI command dvb rx autostart on will not automatically trigger the forward link
acquisition procedure. The CLI command dvb rx start must be explicitly issued. This is
contrary to the CLI command dvb tx autostart on, where the initiation of the log-on
procedure is implicit.
TX autostart set to enabled will overrule any rx autostart configuration. In other words, if the TX autostart
is enabled and the forward link or NCR synchronisation is lost, the STM SatLink VSAT will attempt to
retune/re-acquire the forward link regardless of rx autostart being enabled or not.
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