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2099-42 Clock Generator

  
The Model 2099-42 Clock Generator provides two RS422 clock signals selectable from 256, 192, 128, 96 or 64 kHz and generated from a 12.288 MHz VCXO locked to an external 10 MHz reference. Level detection circuitry provides an alarm signal if the external 10 MHz signal is removed and automatic switching tunes the VCXO in the PLL to 12.28800 MHz until the 10 MHz clock is restored. LEDs indicate PLL and Level alarms, Manual operation, and selection of internal or external (lock to 10 MHz) control of the VCXO. A front panel switch manually selects internal or external (lock to 10 MHz) control of the VCXO. Diodes on the DC inputs allow operation from redundant power supplies. An open collector indicates Manual operation and relay contacts indicate a major alarm due to loss of PLL lock or 10 MHz reference.The unit is housed in an aluminum extrusion chassis and can be mounted on an 1 3/4”, rack panel (Option -R). A wall power supply provides DC power to the 2099-42.
 
 

 2099-42 Clock Generator Front


 2099-42 Clock Generator Block Diagram

Equipment Specifications*
 

10 MHz Input Characteristics  
Impedance
Level Range
 		 75 ohms or > 2k ohms, selectable
0.5 to 1.5 Vp-p
 
Output Characteristics
Level
Data Rate
Stability, Ext. Ref.
Stability, Int. Ref.
Jitter		 RS422
64, 96, 128, 192, 256 kB/s selectable
Same as reference
±50 ppm
<= 1 degree
Controls, Indicators
Int/AUTO/Ext Switch
Int. Freq
INT/EXT LED
MAN. LED
PLL ALM LED
REF ALM LED		 Switches between int and ext (lock to 10MHz) control of VCXO or AUTO select
Adjusts freq of internal VCXO when not locked to external 10 MHz
RED if VCXO controlled internally, GREEN if locked to external 10 MHz
RED when Int/AUTO/Ext Switch not in AUTO
RED when phase lock loop is unlocked if switch in AUTO or Ext Ref
GREEN when external 10 MHz ref is present, RED if removed
Other
Mechanical
Power		 19 inch standard chassis, 1.75"H X 12.5"D
115 ± 10 VAC, 60Hz, 10W, wall power supply

*+10 to +40 degrees C; Specifications subject to change without notice