GSync®

1U Modular GPS Time and Frequency SystemFEATURES• Accuracy- Time: < 50 ns Peak (UTC)  < 50 ns RMS- Frequency: 1E-12• GPS Receivers

GSync Model 391- Standard Civil C/A Code(L1) Frequency- SAASM Military C/AP(Y)-Codes (L1, L2)

GSync® is the 1U compact chassis version of the popular and versatile CommSync II. The heart of theGSync is the GTF (GPS Time and Frequency) module within the unit. It is self-contained with a Quartz or
Rubidium oscillator, and a commercial C/A GPS receiver or a military SAASM GPS receiver• User interface(Rockwell-Collins MPE-S GB-GRAM or Trimble Force 22E MRU).

- Standard RS-232- Keypad/display

If a system needs a Primary Reference Source (PRS), the GSync provides either Standard Positioning- Ethernet I/O(Telnet, SNMP)

Service (SPS) GPS (the civil C/A signal) or the very latest in GPS military technology - SAASM Precision

TM- Zyfer Monitor

Positioning Service (PPS) GPS receivers (for approved users only). With GPS as the reference source, theGUI

GSync provides a frequency accuracy of 1E-12 and a time accuracy of < 50 ns Peak to UTC, forcalibrated units.

• Time Server- SNTP, NTP

The GSync is also designed to take external inputs to provide internal frequency synchronization to the- PTPv2 IEEE 1588-2008

accuracy of the external source.

• Standard Outputs

There are two choices of disciplined oscillator selection. Depending on holdover requirements, an Ovenized- 1 PPS

Quartz Crystal Oscillator (OCXO) or a Rubidium Atomic Oscillator can be specified. The GSync can be- 10 MHz

populated with up to (4) option modules.

- 4 output module slots
for flexibility

There are a wide variety of output option modules available: Low-Phase Noise sine wave, T1/E1,Time Code, and Network Time Protocol (NTP). The full line of common GSync and CommSync II option• External sync input(for distribution systems)

modules are shown in the option module listing on our web site.
For Monitor and Control functions there is an RS-232 communication port on the rear panel of the chassis• All systems are calibrated
with an in-house standard
traceable to UTC

and a standard Ethernet port providing Telnet, SNMP, and Network Time Protocol (NTP), as well as PTPv2
IEEE 1588-2008.
FEI-Zyfer products come with a standard 2 year factory warranty (parts & labor).
Rear Panel View

FEI-Zyfer, Inc.

7321 Lincoln Way
Garden Grove CA 92841
Toll-free: 888-886-7465
E-mail: sales@fei-zyfer.com
www.fei-zyfer.com
391-8003 B

Antenna/Comm
1 PPS/10 MHz
RJ-45 Ethernet

4 Hot-Swappable Option Module Slots

FEI-Zyfer, Inc. is an ISO 9001 certified company.

Power Supply
AC or DC Options

GSync®

1U Modular GPS Time and Frequency System

Output Specifications

GPS Receiver Options

After 24 hours of GPS locked operation, fixed antenna location,antenna delays entered.

Standard GPS Receiver - Civil C/A CodeFrequency Accuracy - 24 Hour average (a)Type:

8 to 12 channel, independent tracking

Frequency:

1575.42 MHz (L1)

Rubidium OSC

Quartz OSC

Code:C/A only< 1E-12< 1E-12Acquisition Time:(b)Warm Start:< 2 minutes

Holdover(a) – first 24 hours: < 5E-11< 1E-10

Cold Start:< 20 minutes

Locked to GPS:SAASM GPS Receiver - Military P(Y)-Code (d)Time Accuracy to UTC, for calibrated units (b)Locked to GPS:

Rubidium OSC

Quartz OSC< 50 ns Peak

< 50 ns Peak

Holdover(a) – first 24 hours: < 3 us
Short-Term Stability(c)< 7 us

MPE-S GB-GRAM:

12 channel, independent tracking

FORCE 22E MRU:

24 channel, independent tracking

Frequency:

1575.42 MHz and 1227.60 MHz (L1 & L2)

Code:

C/A and P(Y)

Acquisition Time (b)typical (Allan Deviation)
Rubidium OSC

Quartz OSC

Warm start:< 2 minutes

1 sec:< 3E-11< 1E-11

Hot or Cold Start:

10 sec:< 1E-11< 1E-11100 sec:< 3E-12< 1E-10Dependent on accuracy of initialization
parameters from PLGR or DAGR handheld
military GPS receivers, or otherinitialization devices

Standard

Low Noise 5 MHz

1 Hz:< −90 dBc/Hz< −100 dBc/Hz

10 Hz:< −105 dBc/Hz< −130 dBc/Hz

100 Hz:< −125 dBc/Hz< −150 dBc/Hz

1 kHz:< −135 dBc/Hz< −158 dBc/Hz

Phase Noise (c) typicalInput/Output (Rear Panel)(1) 1 PPS, 50 Ω, TTL level, BNC, External Sync input(1) RS-232 I/O, DE-9 Connector

Keyload Interface:DS-102

PhysicalHeight:

44 mm (1.75”) (1U)

Width:

448 mm (17.65”) Mounts in 19” EIA rack

Depth:

381 mm (15”) includes connectors

Weight:10 lb. maximum

Panel Color:

Black Satin finish (Front Panel)

Environmental(1) GPS Antenna Connector, TNC

MIL-STD-810G

Operating Temperature: 0 °C to 50 °C

501.5 & 502.5

Storage Temperature:−40 °C to +85 °C

501.5 & 502.5

Humidity:

5 % to 95 %non-condensing
at 40 °C

507.5

• Telnet RFC 854, SSHv1, SSHv2

Operating Altitude:−60 m to 4000 m

500.5• SNMPv1, SNMPv2c, SNMPv3

Storage Altitude:−60 m to 9000 m

500.5• SNTP, NTPv1, NTPv2, NTPv3, NTPv4, PTPv2, IEEE 1588-2008

EMC/EMI:FCC Code of Federal Regulations 47CFRPart 15, Subpart B, Class B(1) 10 MHz, 50 Ω, TTL level, BNC Connector(1) 1 PPS, 50 Ω, TTL level, BNC Connector(1) RJ-45 Fast Ethernet• TCP/IP, Ethernet 2.0/IEEE 802.3, IPv4, IPv6

• Syslog support RFC 5424
Notes:- SAASM Option (front panel)(1) Key Load connector, (1) Hot Start connector, (1) Zeroize button(a) After 48 hours of continuous operation.
(b) 2σ (95.5% probability).
(c) Detailed specifications for various frequency output modules: seePower Options• AC input (115/230 VAC)

100-120 and 200-240 VAC,
100 Watts max., 47-63 Hz• DC input (24 VDC)

18-36 VDC, 100 Watts max.

• DC input (48 VDC)

36-76 VDC, 100 Watts max.

• DC input (12 VDC)

11.5-18 VDC, 150 Watts max.

• DC input(28 VDC aircraft bus)

22-29 VDC, 150 Watts max.

“Option Module User Manual”.
(d) Note: U.S. Government policy restricts the sale of Precise Positioning

Service (PPS) equipment to those authorized by the U.S. Department ofDefense. Non-U.S. authorized users must purchase PPS equipment
through the Foreign Military Sales (FMS) process.
Specifications subject to change without notice.

Designed, Manufactured, and Supported in the U.S.A.

Over 100+ Option Modules available. For a complete list contact FEI-Zyfer, Inc.
FEI-Zyfer, Inc. 7321 Lincoln Way, Garden Grove CA 92841
Toll-free: 888-886-7465 E-mail: sales@fei-zyfer.com www.fei-zyfer.com