VeEX MTX150 Series, Руководство пользователя

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Ethernet © VeEX Inc. All Rights Reserved. 54
BERT Setup - IP Address settings (Layer 3 )
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Data Tab: User selects a test pattern that will be encapsulated in the Ethernet frame payload (for
framed mode).
Depending on the test layer, different test pattern options are available.
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Layer 2, 3, & 4 test patterns
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PRBS:
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2^31 -1 (147 483 647-bit pattern used for special measurement tasks, [e.g., delay
measurements at higher bit rates])
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2^23 -1 (8 388 607 bit pattern primarily intended for error and jitter measurements
at bit rates of 34 368 and 139 264 kbps)
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2^13 -1 (32 767 bit pattern primarily intended for error and jitter measurements at
bit rates of 1344, 2048, 6312, 8448, 32 064 and 44 736 kbps)
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2^11 -1 (2047 bit pattern primarily intended for error and jitter measurements on
circuits operating at bit rates of 64 kbps and N x 64 kbps)
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Fixed: All 0s or All 1s
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User Defined pattern: Length depends on size of frame
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Inversion: Normal or inverted