Exfo FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/5 Instrukcja Użytkownika Pobierz pdf (Strona 499)

100

101

Test Functions

Power Blazer 487

Pointer Adjustment

RX Pointer Adjustment

 Pointer Value

For STS/AU: Displays the value for the pointer, H1 and H2, indicating the

offset in bytes between the pointer and the first byte of the STS-n

(SONET) or AU-n (SDH).

For VT/TU: Displays the value of the pointer, V1 and V2, indicating the

offset in bytes between the pointer and the first byte of the VTn

(SONET) or TU-n (SDH) of the high order path. However, TU-3

considered a low order path, uses the H1, H2, H3 bytes for its location.

 Cumulative Offset indicates the difference between the pointer

increment and the pointer decrement. A pointer jump will reset this

value to 0.

 Ptr. Incr. (Pointer Increment) gives statistics on positive pointer

adjustment detected.

 Ptr. Decr. (Pointer Decrement) gives statistics on negative pointer

adjustment detected.

 NDF (New Data Flag) gives statistics on pointer jumps containing a

New Data Flag.

For STS/AU: Bits 1 to 4 of the pointer word (H1 and H2) detected are

“1001”.

For VT/TU: Bits 1 to 4 of the pointer word (V1 and V2) detected are

“1001”.

 No NDF (No New Data Flag) gives statistics on normal pointer jumps

containing no NDF.

For STS/AU: Bit 1 to 4 of the pointer word (H1 and H2) detected are

“0110”.

For VT/TU: Bit 1 to 4 of the pointer word (V1 and V2) detected are

“0110”.

1 2 ... 494 495 496 497 498 499 500 501 502 503 504 ... 680 681

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