Ericsson MX8400, Справочное руководство

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Hardware Options and Software Licenses
3.5.1.4 Configuration
The GPS option card is configurable via static parameters to allow the user to select
between a redundant and non-redundant configuration and also to allow the user to
select automatic revert to primary input, when a valid signal is re-established. The
set up of the SFN and associated GPS Interface Module is described in
Annex H,
Setting up the SFN Functionality .
3.5.2 Static Parameters
Table 3.14 lists all the static parameters associated with the GPS function.
Table 3.14 Static Parameters (GPS)
Name Description Value
GPS Terminate Input A High impedance or 50
Ω
termination
Enable/Disable
GPS Terminate Input B High impedance or 50
Ω
termination
Enable/Disable
Locking of the Multiplexer clock to GPS 10 MHz is selected using static parameters
(see
Annex C, Static Parameters ) under reference clock option. The options are
similar to HSync (redundant, revert, etc.)
Other Static Parameters are to do with terminating the inputs. Select Terminate
(50
Ω
) if the input is the last in chain, or high-impedance (not-terminated) if the
GPS signals are chained to other MX8400s.
3.5.3 Alarms
3.5.3.1 Non-redundant Configuration
In a non-redundant configuration the GPS option card alarms raised to nCC in the
event of input failures are as defined in
Table 3.15 .
Table 3.15 GPS Interface Module Input Failure Alarms (Non-redundant
Configuration)
Primary GPS Inputs Alarm Severity
Present None
Missing Critical
3.5.3.2 Redundant Configuration
In a redundant configuration the GPS option card, alarms raised to nCC in the event
of input failures are as defined in
Table 3.16 .
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