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J3 Input – Auxiliary Reference

Auxiliary Reference (Aux Ref):

Frequency:

1, 5, 10 MHz

Amplitude:

1

Vp-p to 10 Vp-p at 1 kΩ to ground

Amplitude:

1

Vp-p to 3 Vp-p at 50 Ω to ground

Impedance:

Configurable 1 kΩ or 50 Ω to ground

SNR:

>20db

Quantity:

1

 

Connector:

Female BNC

Factory Configuration:

Disabled

See “F113 – J3 Input Configuration (Aux Ref)” on page 104.

1 PPS – Pulse Per Second Output

Pulse width:

20 μS ±1 μS

On time edge:

Rising

Amplitude:

TTL Levels into 50 Ω

Quantity:

1

Connector:

Female BNC

If a time reference is unavailable, 1 PPS is as stable as the frequency reference (e.g., OCXO, Aux Ref).

CODE – Time Code Output

Format:

IRIG-B 000, IRIG-B 120, IRIG-A 003, IRIG-A 133, and NASA 36

Amplitude (AM):

3 Vp-p, into 50Ω ±10%

Ratio (AM):

3:1 ±10%

Amplitude (DC):

TTL into 50Ω

Quantity:

1

Connector:

Female BNC

Phasing:

In phase with carrier ± 10 μS

Factory setting:

IRIG-B 120

Many IRIG devices only look at the BCD portion of the IRIG frame. Devices that use IRIG A002, B002 and B122 should be able to synchronize with the XLi’s time code outputs.

XLi IEEE 1588 Clock

13

997-01510-03, Rev. C, 12/12/2006

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Symmetricom XLi IEEE 1588 manual J3 Input Auxiliary Reference, PPS Pulse Per Second Output, Code Time Code Output
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