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PCI Comparison Chart

Compared below is the latest in PCI bus card timing technology as well as legacy PCI products. The bc635PCI-V2 represents the newest in PCI technology and is the migration path for users of the legacy bc635PCI-U. Symmetricom is committed to extending the product lifecycle of its bus level timing cards for as long as possible to support customer designs. The PCI-SG 2U is a long standing PCI card that continues to be popular with the installed base of users. We offer this comparison to aid you in selecting the model best suited to your requirements and application.

  bc635PCI-V2 bc635PCI-U PCI-SG 2U
Sync Inputs      
  GPS optional
(bc637PCI-V2) (1)
170 nanosecond accuracy		   optional
(GPS-PCI 2U)
1 microsecond accuracy
  1PPS
  AM and DCLS time code inputs
  IRIG A, B, IEEE 1344 (2)
  IRIG E, G, NASA 36, XR3, 2137    
Sync Outputs      
  1PPS
  IRIG B, IEEE 1344 (2)
  IRIG A, E, G, NASA 36, XR3, 2137    
  Simultaneous AM and DCLS time code outputs    
Timing Functions      
  Accuracy (3) 1 microsecond 1 microsecond 1 microsecond
  100ns Resolution
  BCD Time
  Unix/Binary Time  
  1, 5, 10 MPPS output
  Programmable Rate Generation Outputs/Interrupts 0.0000001 PPS
to 10 MPPS		 <1hz to 250 KHz 1Hz to 1MHz
  Event Time Capture/Interrupts
  Time Compare (Alarm) Output/Interrupts
  Real Time Clock (In the event of a power failure.) Battery backed Battery backed 3 day limit
  Flywheeling/Holdover
  OCXO for Extended Flywheel Accuracy;
  10 MHz sine out		 optional optional  
  External Freq. Input – Disciplining Local Oscillator 1 PPS, 10 MHz 1 PPS, 10 MHz 1 PPS
  External Freq. Input – Cesium/Rubidium Direct 10 MHz 10 MHz  
  3.3V and 5.0V Universal Signaling on PCI Local Bus
  PCI-X Compatible
  Standard half size card (4.2" x 6.875")
Software and Drivers      
  Windows
  Solaris  
  Linux  

(1) The bc637PCI-V2 is the replacement for the discontinued bc637PCI-U.

(2) No IEEE 1344 support.

(3) Accuracy is a function of the input reference. Time codes are generally 1-5 microseconds, GPS is 170 nanoseconds to 1 microsecond depending on model. See datasheets for full details.