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參數(shù)資料
| 型號(hào)： | SY01-S3 |
| 廠商： | Raltron Electronics Corporation |
| 英文描述： | SYNCHRONOUS EQUIPMENT OCXO BASED STRATUM 3 CLOCK UNIT |
| 中文描述： | 基于同步設(shè)備恒溫晶振時(shí)鐘單元地層3 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大?。?/td> | 174K |
| 代理商： | SY01-S3 |
SYNCHRONOUS EQUIPMENT
OCXO BASED STRATUM 3 CLOCK UNIT – SY01-S3
Locked to Ref.1
In this mode the output of the module is phase locked to input reference 1.
Locked to Ref.2
In this mode the output of the module is phase locked to input reference 2.
The REF1 or REF2 Modes are typically used when a slave clock source is synchronized to the network. In these
modes, the SY01-S3 provides timing signals, which are synchronized, to one of two references inputs (REF1 or
REF2). 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.
Input References
The SY01-S3 module accepts two input references EX REF1 and EX REF2. 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 two input frequencies at the time of order.
Output Signals
The SY01-S3 module provides two output signals OUT and OPT OUT. The outputs are generated by the internal
oscillator and scaled by the output frequency converters. The performance of the module significantly depends on the
internal oscillator and special care was taken to define its specification. A Oven Controlled Crystal Oscillator (OCXO)
is used as the internal oscillator. The frequency of the oscillator is specified according to the network application
where the SY01-S3 will be used. The frequency converters divide signal from the oscillator to the specified
frequencies.
The SY01 Operation mode
By changing the control inputs the user can change the state of the SY01 according to the state diagram. The
SY01 offers two ways to manage state machine:
J1 jumper
Open
Closed
RALTRON ELECTRONICS CORP.
§
10651 N.W.19
th
St
§
Florida 33172
§
U.S.A.
Tel: 305 593-6033
§
Fax: 305-594-3973
§
e-mail: sales@raltron.com
§
Internet: http:/www.raltron.com
State diagram control
Manual
Automatic
The behavior of the Manual and Automatic controls are shown on the figures 2 and 3 with an explanation for each
transition. In the Automatic control the SY01 can be automatically switched to the reference (if available)
regardless of status of the control inputs. In Manual control the unit waits for control inputs to be changed. In both
modes the unit will go to the REFERENCE EVALUATION if the previously lost reference is required.
Control
Two controls are available for the user to control the operation of the SY01. The two external inputs CNT1 and CNT2
provide this feature. Below, the truth table shows behavior of the SY01 module according to the control inputs states.
CNT2
CNT1
MODE OF OPERATION
0
0
0
1
1
0
1
1
Free-run
Locked to REF1
Locked to REF2
Holdover
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