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101

Chapter 6 185

BERT Testing

Bit Error Rate Tester–Option UN7

Clock Gate Function

When you use the clock gate function, the clock signal to the BER CLK IN connector is valid

only when the clock gate signal to the BER GATE IN connector is ON.

Press the Clock Gate Off On softkey to toggle the clock gate function off and on.The Clock Gate

Polarity Neg Pos

softkey sets the input polarity of the clock gate signal supplied to the rear

panel BER GATE IN connector. When you select

Pos (positive), the clock signal is valid when

the clock gate signal is high; when you select

Neg (negative), the clock signal is valid when the

clock gate signal is low.

The following figure shows an example of the clock gate signal.

Figure 6-19

• When the

Clock Gate Off On softkey is set to Off:

The clock signal in both “A” and “B” parts is effective and no gate function is required.

Therefore, the bit error rate is measured using the clock and data signal in both “A” and

“B” parts.

• When the

Clock Gate Off On softkey is set to On, and the Clock Gate Polarity Neg Pos softkey

is set to

Pos:

The clock signal in “A” part is effective. Therefore, the bit error rate is measured using the

clock and data signals in “A” part.

• When the

Clock Gate Off On softkey is set to On, and the Clock Gate Polarity Neg Pos softkey

is set to

Neg:

The clock signal in “B” part is effective. Therefore, the bit error rate is measured using the

clock and data signals in “B” part.

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