Exfo FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/5 Instrukcja Użytkownika Pobierz pdf (Strona 619)

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Glossary

Power Blazer 607

Generic Framing Procedure (GFP)

 Type HEC (tHEC) Field: A two-octet field that contains a CRC-16

sequence to protect the integrity of the type field. The tHEC

sequence is computed over the core header bytes using standard

CRC-16. As with the cHEC, CRC-16 enables both single-bit error

correction and multibit error detection.

 Channel Identifier (CID): A one-byte field that is only available

when the EXI field is configured to Linear. The CID byte is used to

indicate one of 256 communication channels at a GFP termination

point.

 Spare: A one-byte field that is only available when the EXI field is

configured to Linear. This field is reserved for future use.

 Extension HEC (eHEC): A two-byte field that contains a CRC-16

check sequence that protects the integrity of the contents of the

extension. CRC-16 enables both single-bit correction and multibit

error detection.

The figure below explains how (in GFP-F) the transmitter encapsulates

one entire frame of the client data.

GFP-F vs. GFP-T Frame Structure

1 2 ... 614 615 616 617 618 619 620 621 622 623 624 ... 680 681

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