Symmetricom TimeProvider 500, Руководство пользователя

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104 TimeProvider 500 2.0 User’s Guide 098-00172-000 Revision A – December, 2009
Chapter 4 CLI Commands
Set Output Commands
Setting Output 3 to T1 isolated pulse
set output pps-mode
This is a new command for 2.0.
There are two settings for 1PPS output.

Standard Mode : Standard mode allows the 1PPS and frequency outputs (10
MHz, E1, T1) to both be optimized. Standard mode allows the 1PPS to be
adjusted without affecting the frequency outputs.

Coupled Mode : In coupled mode, the 1PPS is adjusted by adjusting the system
clock frequency to slew the phase. This frequency adjustment also affects the
frequency outputs. At power-up and extraordinary conditions, the phase may still
be adjusted independently of the frequency outputs.
Syntax:
set output pps-mode {standard | coupled }
Default:
standard
Example:
set output pps-mode standard
Response:
Setting PPS mode to standard
set output pps-offset
This is a new command for 2.0
This command offsets the time position of the 1PPS output. The output is adjusted
in time (compared to where it would be positioned otherwise) by the configured
value. The rising edge is the on-time edge. Any 1PPS output is affected equally by
this setting. The width of the pulse can be adjusted with the CLI command,
set
output pps-width . This offset can compensate for delays in the 1PPS signal and also
for network asymmetries. The default value was chosen to compensate for the
asymmetric Ethernet switch delay if the grandmaster is at 1 Gigabit and the
TimeProvider 500 is at 100 Mbit.
Note : When output is being generated, the OUT LED illuminates
green for either an e1_signal or a t1_signal signaltype. For signal
types of
e1_ais
or
t1_iso_pulse
, the OUT LED blinks green
indicating a special signal type.