XLi Time & Frequency System 1
XLi-man, Issue 8, 6/17/2008, Rev. H
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1: Equipment Overview
XLi Time and Frequency System Description and Features
The XLi provides high-precision time and frequency signals. Its modular design allows customization for
a wide range of applications. In its standard configuration, the XLi functions as a Time Code Unit which
receives an IRIG time code input, synchronizes its internal oscillator to that input, and produces time
code and frequency outputs. When paired with its internal timing-optimized GPS receiver, the XLi
provides 1x10
-12
frequency output accuracy, and better than 30 nS RMS accuracy to UTC (USNO). The
XLi is available in a 19-inch 1U or 2U chassis with rack mount ears for installation.
This new series of Time and Frequency Clock incorporates a flexible architecture to meet the most
demanding clock synchronization requirements. The Model XLi incorporates a dual redundant reference
source design that enables high-availability of the clock source. To achieve high-availability, the user
configures the XLi with dual independent GPS receivers and antennas, or with one GPS antenna/
receiver and one time code or 1PPS reference. In addition, the 2U chassis, when configured with
multiple options, provides dual redundancy and
distribution in a single unit.
Optional oscillator upgrades provide enhanced short term stability when locked to a reference source,
and improved holdover ‘flywheeling’ when a reference source is unavailable. See “P7: Oscillators” on
page 223 for more information.
Features and Options
Three user interfaces are available for managing the XLi:
• The web interface, available using a browser connected to the network port
• The command line interface, available from the serial port and standard network port (telnet)
• The keypad/display interface, available on the front panel of the XLi
The XLi’s modular design allows customization for a wide range of applications. The following range of
features are available in the standard configuration:
• Voltage-controlled temperature-compensated crystal oscillator (VCTCXO)
• 1 PPS Output
• Rate Output 1/10/100 PPS, 1/10/100 kPPS, 1/5/10 MPPS
• Code Output (IRIG-A, B, and NASA 36)
• Alarm Open Collector Output
• Code Input (AM or DC: IRIG-A, B, and NASA 36)
• Auxiliary Reference Frequency Input (1/5/10 MHz)
• Network Port (10/100 Base-T)
• Command Line Interface (Telnet and Port)
• Simple Network Management Protocol (SNMP)
• Web Interface (HTML)
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