12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 181
CPU, Frame Generator, and Clock Modules
Clock Module
Power A and B on the main shelf provide power to the module. These redundant
sources of –48 vDC are diode-coupled and fused, allowing the module to draw
power from either source. The internal fuse labeled F1 protects the circuitry from
excessive current. The DC-to-DC Converter changes the negative voltage into +5
vDC,
±
12 vDC power for the analog sections, and +24 vDC power for the oscillator.
The green POWER indicator on the front panel is lit when either power source is
available to the module. The POWER indicator turns off when power is lost, for
example if the fuse on the module opens, if both –48 vDC power inputs are lost, or if
the converter fails.
Specifications
Symmetricom offers several different Clock modules, as listed in
Table 6-7
. Contact
your local distributor for price and availability of these and other modules for the
TSG-3800.
These Clock modules meet and exceed a wide range of specifications and
requirements. For signal characteristics and specifications, please refer to,
Table
6-8
and
Table 6-9
for the different types of Clock modules.
Table 6-7. Available Clock Modules
Item Number
Description
23478272-001-0
Stratum 3E Quartz Clock Module
23478272-004-0
Stratum 2E Rubidium Clock Module
23478272-011-0
Stratum 3E Quartz Clock Module, EMI
23478272-014-0
Stratum 2E
Rubidium
Clock module, EMI
Table 6-8. Stratum 2E Rubidium Clock Module Specifications
Signal Characteristic
Specification
Accuracy (Free Running)
<
±
1 x 10E
–9
per 20 years
Stability (Holdover)0 to 24 hrs @ 25°
C ± 15°C 0 to 24 hrs -5 to 50°C
<
±
2 x 10E
–11
<
±
1 x 10E
–10
Pull-In Range (Acquire Mode)
±
4 x 10E
–8
Tuning Resolution (Locked Mode)
2.2 x 10E
–12
Warm-Up Time (Warmup Mode)
<10 Minutes
Acquisition Time (Acquire Mode)
< 20 Minutes to enter Lock Mode
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