SY15-S3 Raltron, SY15-S3 Datasheet - Page 3

• Manufacturer Part Number: SY15-S3
• Manufacturer: Raltron

Locked to EX REF.1
In this mode the output of the module is phase locked to input reference 1.
Locked to EX REF.2
In this mode the output of the module is phase locked to input reference 2.
Locked to EX REF.3
In this mode the output of the module is phase locked to input reference 3.
Locked to EX REF.4
In this mode the output of the module is phase locked to input reference 4.
Locked to EX REF.5
In this mode the output of the module is phase locked to input reference 5.
The EX REF1 to EX REF5 Modes are typically used when a slave clock source is synchronized to the network. In
these modes, the SY15-S3 provides timing signals, which are synchronized, to one of five references inputs (EX
REF1 or EX REF5). The input reference signals may have a variety of nominal frequencies, which is typically
specified by the end user. When the modes are selected the unit goes through a reference evaluation, and then a
frequency acquisition, and finally to phase locking.
Local Reference Oscillator
Depending on the type of clock, a local reference oscillator is selected. For example: for a Stratum 3 type of clock,
the local oscillator can be an AT-cut OCXO or in some cases a good TCXO that meets this standard requirements
for frequency drift and jitter noise. For other standards please contact the factory.
The external control is available for the user to control the operation of the SY15-S3. The three external inputs
CNT1, CNT2 and CNT3 provide this feature. Below, the truth table shows behavior of the SY15-S3 module
according to the control inputs states.
The SY15-S3 module accepts five input references EX REF1 to EX REF5. End users can specify the frequencies
within a range of 8 kHz to 77.76 MHz. The input reference signals are HCMOS/TTL levels with timing characteristic
in according to Bellcore GR-1244-core 3.2.1.R3-1 or equivalent standards. Please note that the end user must
specify the input frequencies at the time of order.
The SY15-S3 module provides three high frequency output signals OUT1, OUT2 and OUT3. The outputs are
generated by the high quality low jitter VCXO and scaled by the output frequency converters. The quality of the
output significantly depends on the VCXO oscillator and special care was taken to define its specification. The
OUT1 and OUT2 are buffered from VCXO output while the OUT3 is derived by dividing the output frequency of the
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Control
Input References
Output Signals
RALTRON ELECTRONICS CORP. ! ! ! ! 10651 N.W.19
CNT3
0
0
0
0
1
1
1
1
CNT2
STRATUM 3 CLOCK UNIT WITH HF OUTPUTS – SY15-S3
0
0
1
1
0
0
1
1
CNT1
0
1
0
1
0
1
0
1
th
St ! ! ! ! Florida 33172 ! ! ! ! U.S.A.
MODE OF OPERATION
Locked to EX REF1
Locked to EX REF2
Locked to EX REF3
Locked to EX REF4
Locked to EX REF5
SYNCHRONOUS EQUIPMENT
Holdover
Free-run
Ignored