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參數資料
| 型號： | SY05-HLPL |
| 廠商： | Raltron Electronics Corporation |
| 英文描述： | SYNCHRONOUS EQUIPMENT DUAL OUTPUT HITLESS SWITCHING |
| 中文描述： | 同步設備雙輸出過沖切換 |
| 文件頁數： | 2/8頁 |
| 文件大小： | 162K |
| 代理商： | SY05-HLPL |
SYNCHRONOUS EQUIPMENT
DUAL OUTPUT HITLESS SWITCHING - SY05-HLPL
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
Figure 1. - The functional block diagram of SY05-HLPL
The SY05-HLPL synchronization module is a high frequency PLL that performs hitless switching plus additional
features necessary for timing at high-speed Line Interface Cards. The functional block diagram is shown in figure 1.
The SY05-HLPL receives two reference signals, usually 19.44MHz and using PLL synthesizer generates a high
frequency signal necessary for transceivers or framers. The PLL that is complemented by high-speed logic that
provide processing, switching between the timing modes, alarm and status messages and etc. A high quality VCXO
provides very low jitter at the output. The additional output is provided using a divider.
The module supports two operating modes: AUTO mode is the mode where all switching are done automatically
and MANUAL mode is where unit will switch according to the two external control pins CON1 and CON2.
CON1
CON2
0
0
Free-run (Unlocked)
1
0
Locked to EX REF 1
0
1
Locked to EX REF 2
1
1
The module operates in the following four timing modes: 1) Free-run, 2) Locked to EX REF1, 3) Locked to EX REF2
and 4) Locked to TBL REF. Free-run it a mode the unit is unlocked to either of the inputs. The accuracy of the
output frequencies in this mode is equal to the accuracy of free running VCXO. Locked to EX REF 1 is the mode
where the output of the module is phase locked to input reference 1. Locked to EX REF 2 is the mode where the
output of the module is phase locked to input reference 2, Locked to TBL REF is the mode where is the output of
the module is phase locked to the signal used in Time Loop-back operation.
DESCRIPTION
Operational mode
Locked to TLB REF
MUX,
COUNTERS
&
CONTROL
LOGIC
PLL
(PD+
LF)
÷
OUT
PECL
OPT OUT
PECL
STATUS
SIGNALS
CU#1
STATUS
SIGNALS
CU#2
EX REF1
EX REF2
CNT1 CNT2
TLB REF
ALARM &
STATUS
REV/NONREV
VCXO
AUTO/MAN
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