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參數(shù)資料
| 型號(hào)： | SY01-SMC |
| 廠商： | Raltron Electronics Corporation |
| 英文描述： | SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK |
| 中文描述： | 同步設(shè)備SONET的最小時(shí)鐘 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 154K |
| 代理商： | SY01-SMC |
SYNCHRONOUS EQUIPMENT
SONET MINIMUM CLOCK - SY01-SMC
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-SMC 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-SMC 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-SMC module provides two output signals OUT and OPT OUT. The first outputs are generated by the internal
oscillator and scaled by the output frequency converters if necessary. The second output is coming from free running
crystal oscillator. The performance of the module significantly depends on the internal oscillator and special care was
taken to define its specification. A high quality Crystal Oscillator (VCXO) is used as the internal oscillator. The
frequency of the oscillator is specified according to the network application where the SY01-SMC 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
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.
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
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