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High performance GPS disciplined Time/Frequency standard
Ethernet Interface for management and control
Network Time Protocol (NTP)
Multiple 1PPS outputs with individual delay compensation
Multiple Low Phase Noise 10MHz outputs with software programmable level
Time Code outputs including Have Quick, IRIG A, IRIG B, IRIG E, IRIG G
Sync to GPS or to Have Quick/1PPS per ICD-GPS-060
Choice of internal disciplined OCXO or Rubidium Oscillator

Manufactured By: Brandywine Communications

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The NFS-220 is a low cost precision time and frequency standard that uses GPS for use in WI-FI, Wi-Max, satellite communications, telecommunications, and military communications. This frequency standard is the newest of Brandywine’s GPS Synchronizing clocks and utilizes a high performance 16 channel receiver with automatic position-averaging that enables the best use of GPS when operating in a fixed location. The NFS220 includes 4 low phase noise 10MHz outputs, 4 1PPS outputs with individual 600PS propagation delay compensation, IRIG, Have Quick, and NTP outputs.

The NFS220 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.

The NFS220 utilizes a high performance 16 channel GPS receiver. An automatic position-averaging feature enables the best use of GPS when operating in a fixed location. The NFS220 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.

The basic NFS220 includes a precision OCXO frequency standard, while a Rubidium oscillator is optionally available to give a variety of price and performance options. An option with a low noise OCXO phase locked to a rubidium is also available, combining the low noise characteristic with the OCXO with the long-term stability of a rubidium.

The NFS220 provides “at a glance” status indication via front panel LED’s and can be integrated with other management systems using Ethernet and serial ports.

The NFS220 provides simple integration into military platforms by allowing synchronization from Have Quick time code, which is available on military SA-ASM GPS receivers such as the DAGR or PLGR. The NFS220 also generates Have Quick and 1PPS signals compatible with ICD-GPS-060.

The integrated Ethernet interface provides Network Time Protocol (NTP) synchronization of other connected computers.

In addition to NTP, the NFS220 Ethernet interface contains a built in web server that allows the NFS220 to be controlled using a standard web browser such as Internet Explorer. Simple Network Management Protocol (SNMP) allows easy integration of the NFS220 with industry standard network management systems.

The NFS220 provides three 1PPS time mark outputs. A unique feature allows precisely controlled delays to be inserted into these outputs to compensate for cable and other propagation delays. Compensation delay is independent for each output and has Serial time code outputs are provided to allow time synchronization to be distributed to computers, displays, and other equipment requiring precision time. Two outputs are dedicated to Have Quick time code. Two outputs (one modulated, one DC level shift) may be user selected from IRIG A, IRIG B, IRIG E, IRIG G.

Four low phase noise 10 MHz sine wave outputs from the disciplined oscillator are provided. Signal amplitude is software settable.

All outputs are provided with activity detectors. Loss of any output is indicated by means of a individual front panel alarm LED as well as through the network interface or a discrete alarm output.

Variations

Model Number	Description	Oscillator Type	Power Supply	Power Type	Output Format	Input Format	Time Display
NFS-220	NFS-220 Base Model	OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+HSOCXO	NFS-220 Plus High Stability OCXO Option PWR	OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-Rb-RS422	NFS-220+ w/ Rubidium Oscillator Option (1PPS RS422)	Rubidium	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220-OCXO-10MHZ-DC	NFS-220 Base Model with OCXO option and 10MHz output, with DC Power Supply	OCXO	DC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220-OCXO	NFS-220 Base OCXO Oscillator Option with AC Power Option	OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+OCXO	NFS-220 Plus OCXO Oscillator Option with AC Power Option	OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-OCXO-24VDC	NFS-220 Base OCXO Oscillator Option with 24 V DC Power Option	OCXO	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+OCXO-24VDC	NFS-220 Plus OCXO Oscillator Option with 24 V DC Power Option	OCXO	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-OCXO-48VDC	NFS-220 Base OCXO Oscillator Option with 48 V DC Power Option	OCXO	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+OCXO-48VDC	NFS-220 Plus OCXO Oscillator Option with 48 V DC Power Option	OCXO	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RB	NFS-220 Base Model with Rubidium Oscillator Option with AC Power Option	Rubidium	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RB	NFS-220-Plus with Rubidium Oscillator Option with AC Power Option	Rubidium	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RB-24VDC	NFS-220 Base Model with Rubidium Oscillator Option with 24 V DC Power Option	Rubidium	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RB-24VDC	NFS-220-Plus with Rubidium Oscillator Option with 24 V DC Power Option	Rubidium	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RB-48VDC	NFS-220 Base Model with Rubidium Oscillator Option with 48 V DC Power Option	Rubidium	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RB-48VDC	NFS-220-Plus with Rubidium Oscillator Option with 48 V DC Power Option	Rubidium	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RBOCXO	NFS-220 Base Model with Rubidium Oscillator Option and OCXO Oscillator Option with AC Power Option	Rubidium, OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RBOCXO	NFS-220 Plus Rubidium Oscillator Option and OCXO Oscillator Option with AC Power Option	Rubidium, OCXO	90-264 VAC	AC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RBOCXO-24VDC	NFS-220 Base Model with Rubidium Oscillator Option and OCXO Oscillator Option with 24 V DC Power Option	Rubidium, OCXO	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RBOCXO-24VDC	NFS-220 Plus Rubidium Oscillator Option and OCXO Oscillator Option with 24 V DC Power Option	Rubidium, OCXO	24 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes
NFS-220-RBOCXO-48VDC	NFS-220 Base Model with Rubidium Oscillator Option and OCXO Oscillator Option with 48 V DC Power Option	Rubidium, OCXO	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	No
NFS-220+RBOCXO-48VDC	NFS-220 Plus Rubidium Oscillator Option and OCXO Oscillator Option with 48 V DC Power Option	Rubidium, OCXO	48 VDC	DC	1PPS, 10MHz, IRIG, Have Quick, NTP, RS422, RS232	GPS, HQ/1PPS, 1PPS	Yes

GPS Receiver

Satellite Signal	GPS L1 1575.42 MHz
Satellite Code	C/A 1.023 MHz
Receiver Type	Parallel 16 Channel. All-in view satellites tracked continuously and simultaneously
Warm Start	<10 sec (Open Sky)
Autonomous Start	<60 seconds Cold Start (Open Sky)
Cold Start Requirements	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
Timing Accuracy (Tracking Satellites)	± 100 ns. Absolute UTC Std Deviation 15ns (OCXO)
Timing Accuracy (Holdover mode, +/- 5°C)	< 15 µsec/day (OCXO), <1 µsec /day (Rb2)
Frequency Stability (Tracking Satellites)	See data sheet

1PPS

Connector Type	BNC (2) DB9 (1)
Output Level	0-5V or 0-10V into 50Ω link selectable by user
On Time	Rising Edge

Network Interface

Interface Type	10 BaseT
Protocols	TCP/IP, UDP, NTPv3, HTTP, SNMP v1

Serial Interface

Type	RS232 and RS422
Baud Rate	9600, N, 8, 1

Sine Wave Outputs

Number of Outputs	4
Connector Type	BNC
Frequency	10 MHz
Output Level	0-13dBm into 50 ohm, Software settable

Time Code 1 Output

Connector Type	BNC
Code Type	IRIG A135, B125, E115, G145 software selected
Control Functions	IEEE 1344
Output Levels	3 V p-p into 600 ohm (DCL)

Time Code 2 Output

Connector Type	DB9
Code Type	IRIG A005, B005, E005, G005
Selections	Same as modulated code
Levels	DC level Shift (0-5V)

Time Code 3,4 Output

Connector Type	BNC (1), DB9 (1)
Code Type	Have Quick per ICD-GPS-060
Levels	0-5V

Alarm Status

Alarm Status	Voltage free relay, changeover contacts

Status Indicator LEDs

Status Indicator LED's	Power, Tracking Satellites, Valid Time, Holdover/12hr Holdover alarm, Output Good/Fail ( 8 LEDs)

Power

Power	85-265VAC 50/60Hz
Optional	12VDC, 24VDC, -48VDC, 125VDC

Physical

Dimensions	19” rack mount, 1.75” (1U) height, 7.5“ depth
Weight	11 lb. typical

Environmental

Temperature
Instrument	-10 to +50 °C
Antenna	-40 to +85 °C
Humidity	95% Non-condensing
EMC Emission	To EN55022 as EN55024, FCC Part 15B, Class A
EMC Immunity	To EN 50082-1 as EN61000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst
Product Safety	EN 60950-1/A12:2011

Brandywine NFS220 Datasheet.pdf

Brandywine NFS-220 Plus Datasheet.pdf

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Brandywine - NFS-220 Network Ready GPS Time and Frequency Standard