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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 Military GPS
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 and Network Time Protocol.
Zyfer Monitor (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 |
< -143 dBc/Hz |
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1000Hz |
< -135 dBc/Hz |
< -153 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 1227.42MHz (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-key) |
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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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10 MHz, 50Ω, TTL level, SMA connector |
10 MHz, 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-key) |
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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 12-48 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 2 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 military GPS receivers, or
other initialization devices. |
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GPS
Time and Frequency Systems
