DESCRIPTION APPLICATION VCT1000B hitless-switching dual-input stratum

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DESCRIPTION APPLICATION VCT1000B hitless-switching dual-input stratum

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Stratum Timing Module VCT1000B Application: Dual Input Timing Module
DESCRIPTION APPLICATION VCT1000B hitless-switching dual-input stratum jitter timing module with status outputs alarms. Dual references independently selected lock digital phase lock loop resulting excellent long short-term stability. control inputs used steer state machine decisions operation module. state machine will enter maintain operation free run, holdover, locked condition. state machine operates under requirements section Telcordia GR-1244-CORE. Four status pins indicate condition, which unit operating, alarm outputs indicate loss lock holdover free operation. signal outputs jitter oscillator output divided 8kHz output. Input phase rearrangement allows output remain hitless upon switching references, regardless input phase. Dimensions 0.55". state machine used assure that switching reference allowed, that both references qualified.
CNTL CNTL
System Control State Machine
Free Holdover
Main Status Alarm
Alarm Loss Lock Alarm
System control lines blocks Divider Buffer Output
Input Buffer Phase Alignment Reference Qualification
Hitless Switching
Phase Detector Buffer 19.440 Output
Input Buffer Phase Alignment Reference Qualification
Divider
Holdover History Digital Filtering Stratum OCXO
Figure VCT1000B Block Diagram
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module
ELECTRICAL CHARACTERISTICS
Specification Regulated Input Supply Voltage, Supply Current Drain. turn-on Steady state Current Frequency Output Temperature Ranges Operating Temp. Range Storage Temp. Range Timing Parameters Jitter Generation transfer Jitter Tolerance (see Figure Wander Tolerance (See figure Wander Generation TDEV (see Figure MTIE (see Figure Holdover Frequency accuracy (for initial hours during holdover) Free-run Accuracy (under conditions) Holdover History Correction period Lock time Input Logic Levels Output Logic Levels Module tuning range Dual Reference input Output loads Output Signal Rise-time 19.440 4.75 5.00 5.25 Units
2.4.1 2.4.2 2.5.1 2.5.2 2.5.3 2.5.4 2.5.5 2.5.6 2.5.7 2.5.8 2.5.9 2.5.10 2.6.1 2.6.2 2.7.1 2.7.2 2.10
-0.05
0.05
-0.37 -4.6
0.37
usec
-0.5
-0.25 -9.2 -4.6
Vcc*0.9
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module
Figure Jitter Input Tolerance
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module
Figure
Wander Input Tolerance
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module
Figure Wander Generation
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module
Figure MTIE Wander Generation
Figure MTIE Rearrangement
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Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module MECHANICAL CHARACTERISTICS Pkg. size (50.80 (50.80 0.56 (14.22mm) max. style.
Figure VCT1000B Outline
Page
Rev. 1/20/04
Stratum Timing Module VCT1000B Application: Dual Input Timing Module VCT1000B Functions
5,10,12, 14,16 Name HOLDOVER FREERUN ALARM CNTL CNTL UNLOCK Description Holdover Signal output high when unit holdover mode Reference Signal output high when unit using reference Reference Signal output high when unit using reference Free-run Signal output high when unit free mode Alarm signal output high when there alarm module, alarm condition during free-run mode, holdover mode, Control Input external input selecting mode unit table. Control Input external input selecting mode unit table. Unlocked Signal output high when unit locked references Ground Positive Voltage Supply Synchronized Output output synchronized signal Optional Output secondary output synchronized signal, Pre-defined OUT/N where integer External Reference Input input signal from reference External Reference Input input signal from reference
Control Functions
CNTL CNTL MODE OPERATION Free-run Locked REF1 Locked REF2 Holdover
STANDARD ENVIRONMENTAL LIMITS
This product capable operating within following environmental conditions: Operating Temperature Storage Temperature Humidity (non- Condensing) Atmospheric Pressure Vibration +85°C. Relative humidity 40°C. with double amplitude 1.52mm max. (1/2 hour each perpendicular planes). sine pulse, 7000G, with pulse width 0.3mSec. shock each directions perpendicular planes).
Shock
MAXIMUM SOLDERING PROFILE Temperature Time to150 6min >183°C 2.5min >235°C 0.25min 240°C temperature
Rev. 1/20/04
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DESCRIPTION APPLICATION VCT1000B hitless-switching dual-input stratum

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