146 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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The XLi responds:
OK<CR><LF>
Or, for example, to produce a repetitive one-minute pulse occurring every hour, enter:
F111 PPO XXX:XX:10:00.000000 XXX:XX:11:00.000000<CR>
The XLi responds:
OK<CR><LF>
Or, for example, to produce a repetitive one-microsecond pulse occurring on every hour, enter:
F111 PPO XXX:XX:10:00.000000<CR>
The XLi responds:
OK<CR><LF>
F113 – J3 Input (Aux Ref, Freq Meas)
Note: Frequency Measurement is an optional feature. If purchased at the same time as the XLi, it
comes enabled on the system. To purchase this option after you have purchased the XLi, contact
Symmetricom Sales. See “H: Sales and Customer Assistance” on page 295.
Use function F113 to configure the J3 Input on the XLi back panel (section 3, Figure 5) for one of the
following settings:
• Auxiliary Reference (Aux Ref) input
• Frequency Measurement (Freq Meas) input
• Disable all J3 inputs
F113 offers the following keypad settings:
• J3 Input Configuration: Aux Ref, Freq Meas, Disabled
• J3 Input Frequency: 1 MHz, 5 MHz, 10 MHz
• J3 Input Impedance: 1kΩ, 50 Ω
The factory settings are Disabled, 10 MHz, and 1kΩ.
For J3 Input specifications, see “J3 Input – Auxiliary Reference or Frequency Measurement” on page 10
.
Auxiliary Reference (Aux Ref) Input:
If an external frequency reference with better long-term stability than the XLi's own oscillator (e.g., a
Cesium reference) is available, connect it to the J3 connector and enable Aux Ref using F113. Once this
is done, the XLi will use the Aux Ref input (rather than its own oscillator) as its frequency source if the
XLi's reference source(s) become unavailable.
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