Table of Contents
Related Manuals for Brandywine NFS-221
Summary of Contents for Brandywine NFS-221
- Page 1 User Guide Networked Frequency Standard Model NFS-221 P/N 091001001 Revision B November 2011 Brandywine Communications 1153 Warner Ave Tustin, CA 92780 (714) 755 1050 (714) 755 0175 http://www.brandywinecomm.com MANUAL P/N 900000113 REV A...
- Page 2 Revision History REVISION DATE COMMENTS 04-30-2009 Original release of NFS-221 User Guide. 11-03-2011 1 PPS Input level amendment MANUAL P/N 900000113 REV A...
- Page 3 Safety Warnings WARNING: This unit contains lethal AC voltages. Disconnect the unit from the AC supply before removing the cover. WARNING: The lightning flash with an arrowhead inside of an equilateral triangle is intended to alert the user to the presence of un-insulated “dangerous voltage” within the product’s enclosure. The “dangerous voltage”...
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Page 4: Table Of Contents
3.3.2 Network Connections ....................13 3.3.2.1 Discovering the automatically assigned NFS-221 IP address ......14 3.3.2.2 Changing NFS-221 Network IP address using Internet Explorer ......14 3.3.2.3 Latest Version of Java Software ................16 Configuration ..........................17 Setup ..........................17 4.1.1... -
Page 5: Introduction
GPS when operating in a fixed location. The NFS-221 is fitted with an internal back up oscillator that is continuously calibrated to GPS using an advanced algorithm, providing optimal frequency control of the oscillator. This ensures that the highest time and frequency accuracy is maintained if no satellites can be tracked, and ensures an ultra stable, low noise frequency reference. -
Page 6: Specifications
Specifications Reference Inputs Receiver Type Parallel 16 Channel. All-in-view satellites tracked continuously and simultaneously Satellite Signal GPS L 1575.42 MHz Satellite Code C/A 1.023 MHz Warm Start <10 sec(Open Sky) Autonomous Start <60 seconds Cold Start (Open Sky) Cold Start Requirement Automatic: No input of time or position required Position Accuracy 2.4 m horizontal, 5 m altitude with respect to WGS84 after 24 hour position averaging... - Page 7 System Outputs 1PPS Output 11 Outputs Connector BNC (8) DB9 (3) Level 0-10V for output 1 to 8 (BNCs) 0-5V for output 9, 10, 11. (DB9) On Time Rising Edge Width 100ns to 6.5 ms software settable in 100ns steps Delay -0.5 to +0.5 seconds in 1 ns steps Individually settable for each output...
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Page 8: Led Indicators
Satellites Quick time code has been successfully decoded if HQ is selected as a reference. Indicates that the NFS-221 has not had a valid reference for 12 hours. Indicates that the NFS-221 is not tracking satellites or successfully decoding HQ. -
Page 9: Connections
Connections Table 2 shows the signal interface connections provided on the NFS-221. CONNECTOR REFERENCE CONNECTOR CONNECTOR SIGNAL TYPE J1 1 PPS OUTPUT 1 BNC FEMALE CENTER 1 PPS SHIELD GROUND J2 1 PPS OUTPUT 2 BNC FEMALE CENTER 1 PPS... -
Page 10: Source Impedance Selection And Signal Termination
3.2.1 Mounting The NFS-221 can be installed into a 19” rack mount cabinet either using rack slides or only using the front panel flanges. For static applications, the short depth and light weight of the NFS-221 ensures that the front panel is not stressed when only the front panel is used for support. -
Page 11: Power
GPS signals do not penetrate buildings. Use the cable provided in the shipment to connect the GPS antenna and NFS-221. In the event that a longer cable is required, a low loss cable must be used so that the total signal attenuation at 1575 MHz is < 20 dB. For more information on suitable cables contact Brandywine Communications. -
Page 12: External Gps Receiver (Have Quick/1Pps)
(antenna gain - cable loss) be between 10 dB - 33 dB. Using an antenna with 30 dB of gain allows for about 20 dB of cable loss. The NFS-221 is shipped with 100’ of Belden 8240 antenna cable with a cable loss of approximately 18 dB. -
Page 13: External 1Pps Receiver
Reference source not found. 3.2.5 NTP Server Connection Example The NFS-221 is suitable for use as a Network Time Server, supporting Network Time Protocol (NTP). An example of the deployment of the NFS-221 in this role is shown below. NFS-221... -
Page 14: Discovering The Automatically Assigned Nfs-221 Ip Address
Changing NFS-221 Network IP address using Internet Explorer Enter the IP address of the NFS-221 into the address bar of a web browser running on a computer that is connected to the same network as the NFS-221, as shown in... - Page 15 3. Click on the Submit button. 4. Note that the browser will not reload the page, because the NFS-221 IP address has now changed. 5. Set the browser to the newly configured IP address and confirm that the NFS-221 IP address has changed as desired.
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Page 16: Latest Version Of Java Software
3.3.2.3 Latest Version of Java Software To properly control and monitor the NFS-221 via a web browser based interface, Java software must be installed on your computer. To obtain the Java software, follow the steps given below. Go to http://www.sun.com/ Click on the Downloads link. -
Page 17: Configuration
The Setup tab consists of five sections, the System, IP Address, Reference, Application and Manual Time Set. This tab allows you to modify setup information for the NFS-221. Please note that a Class C Network is being used therefore valid IP addresses are between 192.0.0.0 to 223.255.255.0. To save all modifications made to the Setup screen, click the Submit button. -
Page 18: System
4.1.4.1 GPS Fixed Location Application If the fixed location mode is selected, the NFS-221 will begin to survey it’s location by collecting and averaging the position that it computes from the GPS satellites. The averaged position is then stored into the GPS receiver, and the receiver transitions to a timing mode, where the averaged position is assumed correct, and time is only calculated from all satellites in view. -
Page 19: Gps Mobile Application
4.1.5 Manual Time Set If the External 1PPS Only mode is selected then the NFS-221 will synchronize to the external 1PPS appearing on J10-4. The epoch of this 1PPS must be manually entered by entering the time of the next second using the function provided. Prior to the next second, click Submit to load the time into the NFS-221. -
Page 20: Status
The Status tab consists of four sections Local Time, Reference Status, Oscillator Status, Fault Status. This tab allows you to monitor the functional status of the NFS-221. There are no functions that can be modified on this tab – it is all read-only information. -
Page 21: Reference Status
4.2.3 Oscillator Status The NFS-221 contains an internal disciplined oscillator that is used as the basis of the NFS-221 time and frequency outputs. The oscillator is divided down to 1 pulse per second and the difference between this 1pulse per second and the reference 1 pulse per second is measured and displayed as “Phase Error”. -
Page 22: Time
Time, and Daylight Saving Time (Advanced) and Time Code. This tab allows you to modify the time settings for the NFS-221. To save all modifications made to the Time screen, click the Submit button. To undo all modifications made to the Time screen, click the Reset button. -
Page 23: Serial Output (Tod)
Bits, Stop Bits and Parity. The Format refers to the format of the time messages sent from both the RS232 and RS422 serial ports of the NFS-221 once per second. Table 7 below lists the characters and descriptions used in the Format field. The Baud refers to the number of bits transmitted per second. -
Page 24: Time Zone Settings
4.3.2 Time Zone Settings 4.3.2.1 Standard Time Zone settings The Time Zone Settings consist of two fields, the Time Zone text field and Time Zone combo box. The Time Zone text field allows the user to enter the Standard Time offset from the Universal Time. The Time Zone combo box allows the user to select either hour or minute. -
Page 25: Daylight Saving Time
If the user clicks the check box, the system will automatically adjust the time of the NFS- 221 when daylight saving time occurs. If the user does not click on the check box, the system will not automatically adjust the time of the NFS-221 when daylight saving time occurs. 4.3.4... -
Page 26: Password
Password screen, click the Reset button. IMPORTANT INFORMATION: The default user name and password for the system is BRANDYWINE. The user must always enter a user name and password when submitting changes to the system. Figure 11: Password 4.4.1... -
Page 27: Help
Help The Help tab provides the user with help while using difficult areas in the system. Help links are located throughout the entire system so the user has access to the Help screen whenever the user encounters a problem. Once the user clicks on the help link the user will be automatically redirected to the Help screen. -
Page 28: Drawings
Drawings FIGURE DESCRIPTION NFS-221 Front Panel NFS-221 Rear Panel MANUAL P/N 900000113 REV A... - Page 29 NFS 221 Front Panel NFS 221 Rear Panel MANUAL P/N 900000113 REV A...
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