Agilent Technologies N5980A Manual do Utilizador descarregar pdf (Página 10)

Serial BERT N4906B, Data Sheet V.3

Patterns

Patterns are used as stimulus data on the genera-

tor as well as expected data on the error detector.

These patterns can be setup commonly for the gen-

erator and error detector or independently.

User-programmable test patterns

User defined patterns are available with

variable length from 1 bit to 33,554,432 bits

(32 Mbit).

Alternate test pattern

Switch between two equal length user

programmable patterns, each up to 16,777,216

bits (16 Mbit). Switching is possible by using a

front panel key, GPIB or the auxiliary input port.

Changeover is synchronous with the end of the

pattern. The length of the alternating patterns

should be a multiple of 512 bits. Two methods of

controlling pattern changeover are available: one-

shot and alternate.

PRBS (HW generated)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted) (ITU-T O.151)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted) (ITU-T O.151)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted) (ITU-T O.152)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted)

- 1 Polynomial: x

+ x

+ 1 = 0

(inverted) (ITU-T V.29)

Zero substitution

Zeros can be substituted for data to extend the

longest run of zeros in the patterns below. The

longest run can be extended to the pattern length

-1. The bit following the substituted zeros is set to

Variable mark density

The ratio of ones to total bits in the patterns below

can be set to 1/8, 1/4, 1/2, 3/4, or 7/8.

Available test patterns for zero and variables:

• 8388608 bits based on 2

PRBS

• 32768 bits based on 2

PRBS

• 8192 bits based on 2

PRBS

• 2048 bits based on 2

PRBS

• 1024 bits based on 2

PRBS

• 128 bits based on 2

PRBS

•

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•

Ferdinand-Lassalle-Str. 52

•

72770 Reutlingen

•

Tel. 07121 / 51 50 50

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Fax 07121 / 51 50 10

•

info@datatec.de

•

www.datatec.de

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