Spectracom VersaSync User Manual page 58

2.6 Configuring Inputs/Outputs
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Note: If Auto is chosen as the format group, the format will auto-
matically be Auto- detect. VersaSync will attempt to identify the
format of the incoming ASCII message.
Offset : Provides the ability to account for ASCII input cable delays or other laten-
cies in the ASCII input. The Offset value is entered and displayed in nanoseconds
(ns). The available Offset range is –500 to +500 ms.
Timescale : Used to select the time base for the incoming ASCII time code data. The
entered Timescale is used by the system to convert the time in the incoming ASCII
data stream to UTC time for use by the System Time. The available choices are:
UTC : Coordinated Universal Time ("temps universel coordonné"), also
referred to as ZULU time
TAI : Temps Atomique International
GPS : The raw GPS time as transmitted by the GNSS satellites (as of July,
2015, this is 17 seconds ahead of UTC time)
A local clock set up through the Time Management Page: This option will
appear under the name of the local clock you have set up. Refer to "The
Time Management Screen" on page 114 for more information on how to
configure and read the System Time. Local timescale allows a Local Clock
to apply a time offset for Time Zone and DST correction.
The incoming input time information may be provided as local time, but
System Time may be configured as UTC time, so internal computations
need to be performed. With the Timescale field set to "Local", select the
name of a previously created Local Clock. See for more information on
Local Clocks.
Note: The Timescale of the ASCII input (as configured in the ASCII
time source) must be set correctly, especially if other input references
are enabled. Failure to configure the Timescale of the ASCII input
correctly could result in time jumps occurring in the System Time
when input reference changes occur. These time jumps could affect
NTP and normal operation of the system.
PPS Source : Choices are:
Message : The 1PPS on time point is extracted from the ASCII message
received.
1PPS Pin : The origin of the 1PPS on-time-point is the 1PPS input connector.
Baud Rate : Determines the speed at which the input port will operate.
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