NFS-220 Network Ready GPS Time and Frequency Standard0 pages

NFS220
Network Ready GPS Time and Frequency Standard

NFS220 Networked Frequency Standard
The NFS220 is a precision time and frequency standard that
uses the Global Positioning System (GPS).
It is designed for use in WI-FI, Wi-Max, satellite
communications, telecommunications and military
communication applications.
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

FEATURES
ο 16 Channel GPS Receiver or ICD-GPS-060
Have Quick/1PPS input references

ο Choice of Disciplined Oscillator
ο High Stability Time and Frequency outputs.
ο 1U 19” rack mount
ο Network Interface for remote management
and NTP server

The basic NFS220 includes a precision OCXO frequency
standard, while TCXO and Rubidium oscillators are optionally
available to giving 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.

ο Three 1PPS outputs with propagation delay

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.

ο Four 10 MHz Sinewave outputs

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 <1ns resolution.

compensation

ο Mutiple time code outputs (IRIG B, A, E, G)

ο Have Quick time code
ο Advanced Oscillator Control Algorithm
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.

1153 Warner Ave . Tustin . CA . 92780 . USA
(714) 755 1050 . (714) 755 0175 (FAX) . www.brandywinecomm.com