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Optional
Expansion Configuration |
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CommSync II®
Model 385 |
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CommSync II is a fully-redundant
modular time and frequency system combining dual GPS
receivers, oscillators, and up to 13 output option modules
in a single 3U chassis. The heart of the system is the
GTF (GPS Time and Frequency) reference module, a hot-swappable,
front panel plug-in module (with two slots available for
redundancy).
It is a
self-contained module with Quartz Crystal (OCXO) or Rubidium
Atomic oscillator options, as well as Civil or SAASM GB-GRAM
receiver options. Dual Power Supplies and Reference Modules
provide redundancy with uninterrupted automatic switchover.
Utilized as a Primary Reference Source (PRS), the CommSync
II
provides either Standard Positioning Service (SPS) GPS or
the very latest in GPS military technology - SAASM Precision
Positioning Service (PPS) GPS receivers (for authorized
users only). With GPS
as the reference source, the CommSync II provides a
frequency accuracy of
1E-12 and a time accuracy of <50ns
Peak to UTC.
Additional I/O slots can be utilized by
configuring a slaved CommSync II with Distribution Time
and Frequency (DTF) modules.
For Monitor
and Control functions there is an RS-232 communications port
on the front panel of the GTF/DTF module, a front panel
keypad and display, as well as optional Ethernet plug-in
modules providing Telnet, SNMP, PTP v2, and NTP.
Zyfer Monitor (FEI-Zyfer's remote access utility) provides
complete remote control, including system status, setup,
alarm logging and user management over a standard TCP/IP
connection. |
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Rear Panel View |
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Power Supply
AC or DC |
13 Input / Output
Hot-Swappable Option Module Slots
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Power Supply
AC or DC |
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Available Option Modules for
CommSync II
and GSync
Products |
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Output Specifications
(a) |
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 Frequency
Accuracy: |
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24 Hour
Average |
Rubidium
Oscillator |
Quartz
Oscillator |
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Locked to GPS |
< 1E-12 |
< 1E-12 |
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Holdover
(b)
-
first 24 hours |
< 5E-11 |
< 1E-10 |
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Time
Accuracy: - to UTC, for calibrated units
(c) |
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Rubidium
Oscillator |
Quartz
Oscillator |
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Locked to GPS |
< 50ns Peak |
< 50ns Peak |
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Holdover
(b)
-
first 24 hours |
< 3μs |
< 7μs |
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Short
Term Stability (d)
typical: |
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Allan
Deviation |
Rubidium
Oscillator |
Quartz Oscillator |
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1 sec |
< 3E-11 |
< 1E-11 |
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10 sec |
< 1E-11 |
< 1E-11 |
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100 sec |
< 3E-12 |
< 1E-10 |
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Phase
Noise (d)
typical: |
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Standard
Output |
Low Noise
5MHz |
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1Hz |
< -90
dBc/Hz |
< -105
dBc/Hz |
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10Hz |
< -105
dBc/Hz |
< -130
dBc/Hz |
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100Hz |
< -125 dBc/Hz |
< -150 dBc/Hz |
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1kHz |
< -135 dBc/Hz |
< -158 dBc/Hz |
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GPS
Receiver Options |
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Standard
GPS Receiver - Civil C/A-Code: |
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Type: |
8 to 12 channel, independent
tracking |
| Frequency: |
1575.42MHz
(L1) |
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Code: |
C/A |
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Acquisition
Time: (c) |
Warm Start: <
2 minutes, Cold Start: < 20 minutes. |
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SAASM
GPS Receiver - Military P(Y)-Code:
(e) |
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Type: |
12 channel, independent
tracking |
| Frequency: |
1575.42MHz
and 1227.60MHz (L1 & L2) |
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Code: |
C/A and P(Y) |
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Acquisition
Time: (c) |
Warm Start: <
2 minutes, Hot/Cold Start: Dependent on
Initialization Device
(f). |
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Keyload
Interface: |
DS-102 (Red &
Black keys) |
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Input/Output
(GTF Front Panel) |
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Reference
Option Info |
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Standard
GPS Receiver |
SAASM GPS
Receiver
(e) |
| 1PPS,
50Ω, TTL level, SMA, Ext. Sync Input |
1PPS, 50Ω,
TTL level, SMA, External Sync Input |
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RS-232
I/O connector |
RS-232 I/O
connector |
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10MHz, 50Ω, TTL level, SMA connector |
10MHz, 50Ω, TTL level, SMA connector |
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1PPS, 50Ω,
TTL level, SMA connector |
1PPS, 50Ω,
TTL level, SMA connector |
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Keyload Interface -
DS-102 (Red & Black keys) |
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Hot Start
connector (optional) |
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Power
Options |
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Power
Options Info |
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Several Power Input
options are available, which include single or
dual modules (for redundancy), 115/230 VAC 50/60 Hz or 12,
24, and 48 VDC, or a combination of AC and DC
Power Input modules. |
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Chassis Physical
Dimensions |
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Height: |
134 mm (5.25") (3U) |
| Width: |
448 mm (17.65")
(19" EIA Rack) |
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Depth: |
381 mm (15.0")
including connectors |
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Weight: |
25 lbs. (max.) |
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Environmental |
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Operating
Temperature: |
0° C to 50° C |
| Rate
of Change: |
10° C/Hour |
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Storage
Temperature: |
-40° C to
+85° C |
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Relative
Humidity: |
5% to 95%,
non-condensing |
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Altitude,
Operating: |
-60m to 4000m |
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Altitude,
Storage: |
-60m to 9000m |
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Notes: |
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(a) After 24 hours of
GPS locked operation, fixed antenna location,
antenna delays entered. |
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After 48 hours of continuous operation. |
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(c) 2σ (95.5%
probability). |
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(d) Detailed
specifications for various output modules: See
"Option Module User's Manual 385-8003". |
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(e) The sale of
SAASM receivers is restricted to users
authorized by the U.S. Department of Defense. |
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(f) Dependent on the
accuracy of initialization parameters from PLGR
or DAGR handheld SAASM GB-GRAM receivers, or
other initialization devices. |
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GPS
Time and Frequency Systems
