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XLi FAQs

XLi Product
What do I get with the base XLi
Why should I buy an XLi product?
Why should I purchase this product versus another product from another company?
What markets does the XLi support?
Who should buy an XLi product?
What kind of accuracy should I expect with an XLi product?
Is this product delivered from stock?
What kind of lead-time does the XLi have?
Does the XLi replace the XL-DC?
Is the XLi backward compatible with the XL-DC?
Will my XL-DC cards work in the XLi?
What's the difference between XLi and XL-DC?
What kind of a display does the XLi have?
Is the XLi easy to use?
What new features does the XLi have?
What does modularity mean?
Is the XLi an upgraded XL-DC?
When will the XL-DC be obsoleted?
Can the XLi be used to replace an existing XL-DC without any changes?
What are the benefits of upgrading my XL-DC with the XLi?
Can I use my existing XL-DC option cards in the new XLi? If so, which ones?
How do I communicate with the XLi
How can I upgrade the software of the XLi?
How many options can I add?
Can I add redundant options?
Can I add redundant GPS receivers?
Can I add redundant power supplies?
Does the redundancy include the oscillators?
What different oscillators can I add to the unit?
Are the any options hot swappable?
Can I have "special" requirement designed in the XLi?
My XLi is running but there is no PPS or IRIG out.
What display modes can I have?
How much does the XLi weigh?

Time Code Unit (TCU)
How does the XLi work as Time Code Unit?
Can it operate as time code and GPS receiver simultaneously?
Can I integrate a "special" TCU requirement with the XLi?
Can the XLi operate as a countdown generator and what codes will it support?
Which time code products does the XLi replace from the Symmetricom line?
What codes are available in the XLi standard and optionally?
What are the advantages of the XLi over the 800 and 900 series?
What are the advantage of 800/900 series TCU over XLi
Is fault sense and switching available for multiple time code inputs?
What time codes can be used as a sync source for NTP?
Can I sync to NTP and generate time code 1pps,rate, frequency etc?

Network Port
Is the network port an option?
What functionality can I get from the network port? And what are the benefits?
What security does the network port have? And what are the benefits?
Does the XLi support SNMP protocol?
What kind of SNMP functionality is available?
How can the network port serve time like NTS?
Can I enter commands to the unit through the network port?
Can I get NTP without GPS?
What references can be used as a sync source for NTP?

Antenna and Cable
Will my XL-DC antenna work with the XLi system
Will my XL-DC Down/Up converter work with the XLi
Are the antenna and cable shipped standard with the XLi?
What is the standard cable length included with the GPS receiver XLi system?
What is the maximum length supported by the GPS receiver without preamplifier?
From which length of cable is the preamplifier required?
From which length of cable RG 59 is the Down/Up converter required?
What if I want more than 1500 ft cable?

Service and Support
How does XLi improve service and support?
Can Symmetricom access my XLi remotely?
Do I need to ship my XLi to Symmetricom for service and upgrades?
What do I do when the CPU is defective?
What diagnostic tools available for the XLi?

Configuration Questions
Do we have the NTP option and how is it turned on?
Why is the Xli displaying the wrong year of 2000, while using the time code input on J1?
Since Daylight Savings Time started, the XLi is an hour off. How do I correct this?
Why does configuration parameter "Auto" only negotiate to 10BaseT for F100?
With MD5 on, the XLi doesn't seem to be using MD5. Why do our Cisco devices synchronize with it even without the trusted key?
With 2 XLi units synchronized via IRIG B. Why does The NTP alarm not clear?
When the Xli was rebooted, the option card was not recognized. How do I fix this?
When checking F73 Alarm configuration and control, why is there always a fault on the IRIG input?
do I change the outputs of the 86-8008 cards?

Upgrade Troubleshooting
We are getting a response of "unable to open file. Too many unsuccessful attempts" What is wrong?
We just upgraded our XLi to 2-3.1. Now the NTP option is gone. How do we restore it?

GPS Operation Questions
Why does XLi have red LED on front panel and unit is in "unlocked" state?
How do I correct the wrong year and date displayed on XLi while reporting locked to GPS PRI?
The time jumped to the wrong year, and did not correct after a power cycle. What needs to be done to correct the time?
I am upgrading to an XLi. Can a MK3 or XL-DC antenna be used with the XLi?
Does the antenna need to be changed when replacing the ET6000 or 9390-6000 with an XLi?
Why is the Xli not locked when the GPS option card shows 8 Satellites tracked?

Specification Questions
How is the web page user name and password reset on the XLi?
Why would the output 1pps drift too much for a unit with a rubidium option?
Are the LLA coordinates obtained with the F50 function on the XLi geodetic or geocentric latitude?
What is the delay or set up time when sending the F commands manually using Telnet or RS232?
The new Xli GM V2 is not working with our old v1 what do we need to do to get the units to sync?
Can the XLi be used as a standalone calibration source for the time base of a counter?
Can the power supplies be exchanged between units?
What is the cable type recommended for use with the 142-6150-XXX? Is it different than the 142-614-50 antenna included with the XLi?
Does the XLi need a null modem cable on the RS232 serial port?
Is there a10MHz sine wave output standard on the XLi J2 BNC?
What is the maximum baud rate that can be selected for the RS232 port?
What is the unlocked performance of the XLi 1pps?

General Questions
Why does the XLi time jump back to 1970 and display elapsed time upon power cycle?
What is the standard warranty period for the XLi?
Is there an extended warranty available?
Can this instrument have a banner implemented that when accessed warns the user that he or she is on "Company X Machine" and that unauthorized access will be prosecuted?
Can some sort of Antivirus/Malware be installed on this device?
Can this instrument somehow log security events such as logins, or malicious attacks?
Can a Password have complexity, minimum length and password aging?
Is the Xli NERC CIPS compliant?
How do I register the unit? Here is nothing online.
How is the DST enabled on XLi?
The key pad is not responding on the XLi. What can be done to get it working?
Can the Xli option cards be installed in the field?
What is the MTBF of the XLi?
Can we get a copy of the certificate of volatility?

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XLi Product

1) What do I get with the base XLi
Standard features of the XLi are:
-  Generator + Translator + Synchronized Generator
-  Better than 30 ns rms accuracy to UTC
-  Better than 1x10-12 frequency accuracy
-  Code In Sync to AM or DC IRIG A, B and NASA 36
-  Code out AM or DC IRIG A, B and NASA 36
-  Rate out 10MPPS default, programmable to 1PPS, 10PPS, 100KPPS,... 10MPPS
-  Alarm Open Collector via rear BNC
-  Auxiliary reference for sync to external 1Mhz, 5Mhz and 10Mhz
-  Vacuum fluorescent display and keypad
-  RS-232 / RS-422 user selectable
-  Ethernet network Port
-  Telnet and SNMP
-  Enterprise MIB, FTP (for firmware upgrades) and DHCP
-  Flash Memory for remote software upgrades
-  AC Power Supply 90-264V
-  4 options slots for 1U chassis (1.75 inch)
-  10 options slots for 2U chassis (3.5 inch)

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2) Why should I buy an XLi product?
Modularity, flexibility and the most plug-in options available in any timing product allows for best configuration for your unique timing requirement. Combined with a standard network port for remote control and monitoring, a clean "plug and play" options platform, and a bright vacuum fluorescent display. XLi is the best price performance Time and Frequency Unit available

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3) Why should I purchase this product versus another product from another company?
The most standard features, the most standard options available in the industry, quick configuration, field upgradeability, bright vacuum fluorescent display, multi-interfaces for control and the industry's first standard network port. XLi leverages Symmetricom long history of technology expertise in the Time and Frequency field. With the best customer service, Symmetricom sales will help you configure the right XLi for you, and customer support will give you the best service and advice to get the most out of your system. Put us to the test and give us a call.

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4) What markets does the XLi support?
XLi is essential to application that requires precise timing, synchronization, or frequency source. A GPS timing source-reference or just a Time Code Unit (TCU) for countdown, generator or synchronized generator. With the numerous options that it has, XLi is a custom fit for any application in the test/measurement, process automation, power system control, military test ranges, military communications, telecommunications, television broadcast, satellite ground stations, and research facilities.

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5) Who should buy an XLi product?
Anybody with need for precise timing, synchronization signal, frequency signals, rates, IRIG codes, launch codes, Telecommunication synchronization, Time stamping, NTS Network Time Server, T1, E1 synchronization needs, Data rate generator, power utility timing, Satellite ground station synchronization, test range facilities, HDTV synchronization and any time synchronization and frequency needs, with or without GPS time receiver.

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6) What kind of accuracy should I expect with an XLi product?
Accuracy is a function of the input source to the system. With XLi you can expect better that 1x10-12 frequency accuracy and better than 30ns rms 1PPS accuracy to UTC.

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7) Is this product delivered from stock?
Despite its sophistication and huge capability, The XLi is Custom Of The Shelf (COTS) product with typical lead-time of less than three weeks

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8) What kind of lead-time does the XLi have?
Because of its modularity and ease of configuration, a completely custom and uniquely configured system typically takes three weeks or less from the time of order to the time of shipping.

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9) Does the XLi replace the XL-DC?
The XLi is functionally compatible with the XL-DC. The XL-DC has been the best Time and Frequency product on the market since 1995, and the XLi continues this heritage with more advances and new state of the art design.

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10) Is the XLi backward compatible with the XL-DC?
The XLi is functionally compatible with XL-DC, and all the commands that control XL-DC (F-commands) are the same. But due to the XLi new architecture and all the added features and benefits, it is not possible to be backward compatible with interface software. If you have software written that interfaces with the XL-DC you have to modify it for the XLi, and take advantage of all the new features, especially using the new Network port.

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11) Will my XL-DC cards work in the XLi?
Because of the added features and the new XLi platform, Symmetricom does not recommend users to plug XL-DC cards in the XLi system. This includes all "special" designs for XL-DC. Please consult Symmetricom before attempting to use any XL-DC card in the XLi.

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12) What's the difference between XLi and XL-DC?
XLi has a lot more added advantages and features over the XL-DC. The GPS receiver is an option to the XLi, and without it, the system operates as a Time Code Unit (TCU) for all the Time Codes supported, please consult datasheet for the latest Time Codes. With GPS, the system is a precision GPS time source for all the various functions and codes needed. The XLi has the industry's first standard network port for remote control and monitoring with multi-layer password protection, SNMP, Telnet, FTP and DHCP. The automatic options recognition software enables for "plug and play" which has the advantage of field upgradeability. And with flash memory, the XLi software can be upgraded remotely using FTP and the network port. XLi has a brilliant multi-line vacuum fluorescent display. It has the capability of displaying different status of the system, or the Time of Year (TOY) as DDD: HH:MM:SS in big bold and bright digits.

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13) What kind of a display does the XLi have?
The XLi has a brilliant multi-line vacuum fluorescent display. It has the capability of displaying the Time of Year (TOY) as DDD: HH:MM:SS in big bold and bright digits. Or users can display different status of the XLi system and its components with a push of a button. The intensity of the display is controlled by the XLi operating system via user's interface.

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14) Is the XLi easy to use?
Out of the box you can plug in the XLi power cord and its up and running with default settings. Its sophisticated operating system takes care of the complex task of controlling the numerous tasks of boot-up. With GPS antenna, the XLi starts to receiver precise data and outputs codes without user intervention. Users will need to change different setup to take advantage of endless features that the unit has.

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15) What new features does the XLi have?
The GPS receiver is an option to the XLi allowing the system to operate as a Time Code Unit (TCU) for all the Time Codes supported; please consult datasheet for the latest Time Codes. With GPS, the system is a precision GPS time source for all the various functions and codes needed. The XLi has the industry's first standard network port for remote control and monitoring with multi-layer password protection, SNMP, Telnet, FTP and DHCP. The automatic options recognition software enables for "plug and play" which has the advantage of field upgradeability. And with flash memory, the XLi software can be upgraded remotely using FTP and the network port. XLi has a high-tech looking multi-line vacuum fluorescent display. It has the capability of displaying different status of the system, or the Time of Year (TOY) as DDD: HH:MM:SS in big bold and bright digits. Finally, the XLi had all new components ensuring its viability into the next decade.

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16) What does modularity mean?
It means that each hardware option is a module that can be plugged in to the system to add more capability of the XLi system. With each added option the XLi becomes capable of more features and can serve more functions. However, adding the hardware requires software recognition, so the software controlling the system is also modular. So, when an option is plugged-in, the XLi operating system recognizes it and launches the software module to operate that hardware option. This is a great feature that enables customers to buy options after they have purchased the XLi system. They can plug them in, power up the XLi, and the system will automatically add the new option to its configuration and launch its corresponding software module, in effect, modularity is a complete "Plug and Play" feature in the XLi.

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17) Is the XLi an upgraded XL-DC?
NO, XLi is not an upgraded XL-DC. The XLi system is a completely new design with a new microcontroller platform, a new operating system and all new components. However, the XLi has leveraged the modular style of the XL-DC into its core, which leverages many of the XL-DC plug-in card capabilities. In essence, XLi maintained the bloodline of the legendary XL-DC with all the modern technology innovations and advances incorporated.

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18) When will the XL-DC be obsoleted?
Symmetricom introduction of the XLi indicates an orderly transition to a new technology, which will drive the conversion from the XL-DC to the XLi platform. But the XL-DC will be the only option for many requirements, and will play a role in our product line until we have replaced the majority of its capability in the XLi. Currently, we don't foresee the obsolescence of the XL-DC product line.

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19) Can the XLi be used to replace an existing XL-DC without any changes?
The functionality of the XLi system is the same as the XL-DC. So, a same configuration XLi will produce the same signals as that of an XL-DC. However, any software that users wrote for the XL-DC is not 100% backward compatible, and may need to be changed. This is because XLi has many new added features and some of the commands had to be changes. Please consult with Symmetricom for help to convert your XL-DC application to the powerful XLi.

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20) What are the benefits of upgrading my XL-DC with the XLi?
The XLi has the industry's first standard network port for remote control and monitoring with multi-layer password protection, SNMP, Telnet, FTP and DHCP. The automatic options recognition software enables for "plug and play" which has the advantage of field upgradeability. And with flash memory, the XLi software can be upgraded remotely using FTP and the network port. XLi has a brilliant multi-line vacuum fluorescent display. It has the capability of displaying different status of the system, or the Time of Year (TOY) as DDD: HH:MM:SS in big bold and bright digits. And without the GPS receiver, the XLi system operates as a Time Code Unit (TCU) for all the Time Codes supported, please consult datasheet for the latest Time Codes. Finally, the XLi had all new components ensuring its viability into the next decade.

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21) Can I use my existing XL-DC option cards in the new XLi? If so, which ones?
Because of the added features and the new XLi platform, Symmetricom does not recommend users to plug XL-DC cards in the XLi system. This includes all "special" designs for XL-DC. Please consult Symmetricom before attempting to use any XL-DC card in the XLi.

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22) How do I communicate with the XLi
Users can communicate with the XLi by sending different "F" commands to the system to control its different functions and monitors. These commands can be sent to the system via three different interfaces. Firs by using the front panel keypad and display, second via the RS-232/422 serial interface with a computer, and finally, from anywhere in the world through with an IP interface via the standard Ethernet network port onboard the XLi. Future improvements and advantages is what makes the XLi the best timing system you'll ever get, just keep watching out for latest updates and added feature to the XLi.

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23) How can I upgrade the software of the XLi?
This is the simplest part of owning an XLi. The combination of the network port and flash memory makes remote software upgrades an easy and quick task. You can wither download the new firmware from the Symmetricom.com website, or obtain it from Symmetricom customer support on CD. Setup your workstation as the FTP server, and upload the new firmware into the XLi using F100 command, via either a Telnet session or RS-232 port. Please refer to the XLi user manual for complete description of this operation. Finally, reboot the XLi, and viola! You got the latest operating software working.

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24) How many options can I add?
Currently, the XLi has nine plug-in options and five non-plug in option, all listed below. Symmetricom is always adding more options to the system, please consult the latest online datasheet for more up-to-date list of supported options. And of course, we can custom design any "Special" requirement.
Non- plug-in options:
OCXO
High stability 10Mhz OCXO
Rb. Osco. 5x10-11
High Stability Rb. Osco. 1x10-11
NTS on Standard Ethernet Network Port
Plug-in Options
GPS timing engine
1, 5, 10 MHz Sinewave
1,5,10 MPPS Output
Telecom Interface - T1
Telecom Interface - E1
Multicode 4 AM outputs
1,5,10 MHz x 4 LPN
Frequency Synthesizer N.8
DC power cards (±12 ±24 ±48 V)

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25) Can I add redundant options?
All options for the XLi are redundant, including AC and DC power supplies and the GPS receiver option. Dual redundant GPS receiver function in a master-slave configuration set up by the XLi microcontroller, and the power supplies will switch automatically upon failure detection of the master supply. All redundancy is designed for continuous uptime.

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26) Can I add redundant GPS receivers?
Yes! Dual redundant GPS receiver is a big feature of model XLi. Both receivers plug into the back of the unit, and function in master-slave configuration controlled by the microcontroller on the XLi. The switch from primary to secondary, and vise versa, takes place with no loss of lock, and designed to eliminate single point of failure and maintain continues uptime.

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27) Can I add redundant power supplies?
Up to two power supplies can be added to the XLi system. A combination of AC and DC supplies can be used, and switch over s done automatically to

 
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