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Enhanced Clock Stability for the 1588 enabled network


In Packet based timing, the prediction, monitoring and management of Packet Delay Variation is complex, challenging, potentially costly and still open to random 'network noise' events.
Placing a predictable, stable and cost effective local clock at the client node can greatly improve the odds in dealing with network noise – increased client robustness allows a timing to be deployed across larger and less managed networks, reducing the overall cost of a timing solution.
Vectron matches the stability characteristics of its oscillators with the requirements of 1588 client clocks – this is done by design, but also through a system level verification of the oscillators' suitability in the target application. Choosing oscillators for 1588 applications is in many ways similar to selecting devices to support SONET/SDH 'stratum' level applications. However the role of PDV and any corresponding packet filtering used in a Packet Equipment Clock (PEC) needs to be considered also, since the system loop filter bandwidth is not necessarily pre–defined in the same way as SONET/SDH.


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1588 Oscillators: Environmental Influences on
Short Term Stability
Recommended Oscillators to support Packet Based Clock Implementation
Specification # Standard
Frequencies
Available
(MHz)
Oscillator
Type
Size (mm) Package
Type
Suggested loop filter
to meet GR-1244
MTIE and TDEV
Temp
Stability
Temp
Range
Output
Type
Supply

DX-0400-DAJ-4001-FREQUENCY
Photo of the DX-040 OCXO component
10, 12.8
20, 25
Double Oven
Controlled Oscillator
50.8 x 50.8 x 25.4 Through Hole 0.1 mHz ±0.4ppb –20 to 70°C HCMOS 5.0V

DX-1700-DAJ-4001-FREQUENCY
Photo of the DX-170 OCXO component
10, 12.8
20
Double Oven
Controlled Oscillator
38.1 x 27.9 x 19.0 Through Hole 0.3 mHz ±0.4ppb –20 to 70°C HCMOS 5.0V
 
OX-503
OX-503 OCXO
OCXO
12.8
20
Mini Oven
Controlled Oscillator
9 x 14 x 9 SMT 1 mHz ±10ppb –20 to 70°C HCMOS 3.3V

OX-2022-EAE-1080-FREQUENCY
Photo of the OX-202 OCXO component
10, 12.8
20, 25
Oven
Controlled Oscillator
25.4 x 25.4 x 13.4 Through Hole 1 mHz ±10ppb –40 to 85°C HCMOS 3.3V

OX-2221-EAE-1080-FREQUENCY
Photo of the OX-222 OCXO component

10.0

 
Oven
Controlled Oscillator
22.0 x 25.4 x 12.1 SMT 1 mHz ±10ppb –40 to 85°C LVCMOS 3.3V

20.0

 

OX-2226-EAJ-1080-FREQUENCY
Photo of the OX-222 OCXO component

10.0

 
Oven
Controlled Oscillator
22.0 x 25.4 x 8.5 SMT 1 mHz ±10ppb –20 to 70°C LVCMOS 3.3V

20.0

 

OX-4022-EAE-1080-FREQUENCY
Photo of the OX-402 OCXO component

20.0

 
Oven
Controlled Oscillator
13.1 x 20.7 x 10.2 Through Hole 1 mHz ±10ppb –40 to 85°C LVCMOS 3.3V

OX-4033-EAE-1080-FREQUENCY
Photo of the OX-403 OCXO component

20.0

 
Oven
Controlled Oscillator
13.1 x 20.7 x 12.5 SMT 1 mHz ±10ppb –40 to 85°C LVCMOS 3.3V
 

OX-4000-EAE-2580-FREQUENCY
Photo of the OX-400 OCXO component

20.0

 
Oven
Controlled Oscillator
13.1 x 20.7 x 8.5 Through Hole 3 mHz ±25ppb –40 to 85°C LVCMOS 3.3V

OX-4011-EAE-2580-FREQUENCY
Photo of the OX-401 OCXO component

20.0

 
Oven
Controlled Oscillator
13.1 x 20.7 x 10.8 SMT 3 mHz ±25ppb –40 to 85°C LVCMOS 3.3V

OX-2201-EAE-2580-FREQUENCY
Photo of the OX-220 OCXO component

10.0

 
Oven
Controlled Oscillator
22.0 x 25.4 x 12.1 SMT 3 mHz ±25ppb –40 to 85°C LVCMOS 3.3V

12.8

 

20.0

 

25.0

 
 

OX-2201-EAE-5080-FREQUENCY

Photo of the OX-220 OCXO component
10, 12.8
20, 25
Oven
Controlled Oscillator
22.0 x 25.4 x 7.8 SMT 10 mHz ±50ppb –40 to 85°C LVCMOS 3.3V

OX-4000-EAE-5080-FREQUENCY

Photo of the OX-400 OCXO component
10, 12.8
20, 25
Oven
Controlled Oscillator
13.1 x 20.7 x 10.2 Through Hole 10 mHz ±50ppb –40 to 85°C LVCMOS 3.3V

OX-4011-EAE-5080-FREQUENCY

Photo of the OX-401 OCXO component
10, 12.8
20, 25
Oven
Controlled Oscillator
13.1 x 20.7 x 10.8 SMT 10 mHz ±50ppb –40 to 85°C LVCMOS 3.3V

TX-5020-EAJ-5080-FREQUENCY

Photo of the TX-502 TCXO component
10, 12.8
20, 25
Temperature
Compensated Oscillator
9.5 x 14.4 x 5.9 SMT 100 mHz ±50ppb –20 to 70°C HCMOS 3.3V

For cost effective alternatives in less demanding client applications we suggest the following:


VI Part # Frequency (MHz) Oscillator Type Size Package Style

VCC1-B3B-FREQUENCY
Photo of the VCC1 Crystal Oscillator component
25
50
125
Clock / Crystal Oscillator 5 x 7 SMD

VC-801-B3B-FREQUENCY
Photo of the VCC4 Crystal Oscillator component
25
50
125
Clock / Crystal Oscillator 5 x 3.2 SMD

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