SMG digital gateway 39
warning, yellow LED—the fault does not affect provisioning of communication services;
OK, green LED—the fault is resolved.
Parameters—detailed fault description.
4.1.2.7 Interface Monitoring
This section describes status monitoring for network interfaces and turning VPN/PPTP interfaces on and
off.
4.1.3 Synchronisation Sources
To synchronise the device with multiple sources, a priority list
algorithm has been implemented. The algorithm is as follows: when a
sync signal from the current source is lost, the system looks through
the list to find active signals from lower priority sources. When a
higher priority signal is restored, the system switches to that signal.
Also, there may be multiple sources of the same priority. When a
signal of the same priority is restored, the system does not switch to
that signal.
Up to 4 synchronisation sources are supported (from any of the
4 E1 streams).
To generate the list, use the following buttons:
—Add Source; —Remove.
To change the source priority, use the Up/Down buttons located next to each source. The highest
priority value is 0, the lowest priority value is 14.
Signal loss timeout, sec—time interval when the system does not switch to a lower priority
synchronisation source in case of a signal loss. If the signal is restored during this interval, the
system will not switch to a lower priority source.
Signal presence timeout, sec—time interval when the restored higher priority synchronisation
signal should be active for the system to switch to that signal.
If the PRI protocol is configured for the stream, from which the synchronisation signal is
received, then the PRI protocol should also be enabled for the connected stream at the other
side. Otherwise, the synchronisation signal will not be received from the stream, which will
cause slips.
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