Manual Leap Second Entry; Havequick Tfom - Symmetricom XLi User Manual

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• Impedance:
• Qty:
1
• Connector:

Manual Leap Second Entry

The Manual Leap Second Entry is configurable via the Keypad / Display, RS232/422 and the Network
port via telnet and HTML. This function allows the user to enter leap second data. This mode of
operation will allow the user to maintain UTC with the XLi clock without an external time reference
providing leap second data or in a standalone mode (i.e. without a time reference).
Locked reference sources containing leap second data (GPS and IRIG-B w/ IEEE1344) take priority to
the manual leap second entry.
Manual leap second data is applied to the XLi UTC TOD when locked to any reference source that does
not contain leap second data.
The manual leap second data will be applied to the clock at the end of the current quarter that it was
entered at UTC midnight on the last day of March, June, September, or December
The function is selectable by:
1. Enter / Request the current GPS leap second, e.g. 14.
2. Enter / Request the leap second, adding or subtracting in March, June, September, or
December

HaveQuick TFOM

The following Time Figure of Merit Code has been added to the HaveQuick output
TFOM code bits
0 0 0 0
1 1 1 1
All others
16
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Logic Hi
100K, or 50
1
BNC female
Table 2:
Meaning
locked
unlocked
Not used
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>2.5V < 10V
Ω .
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XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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