EXFO FTB-8510B Guia Del Usuario página 1304

Glossary
Next-Gen - Generic Framing Procedure (GFP)
654
Payload FCS Indicator (PFI): A one-bit subfield indicating the
presence (1) or absence (0) of the payload FCS field. The following
table lists the currently defined PFI values.
PFI
0
1
Extension Header Identifier (EXI): A four-bit subfield identifying
the type of GFP extension header. Three kinds of extension
headers are currently defined:
EXI Description
0000 Null Extension
Header
0001 Linear
Extension
Header
0010 Ring Extension
Header
0011 Reserved
to
1111
Description
FCS Absent
FCS Present
Function
Indicates that no extension header is
present.
A two-octet extension header that supports
sharing of the GFP payload across multiple
clients in a point-to-point configuration. The
linear extension header consists of an
eight-bit channel ID (CID) field, used to
indicate one of 256 communication
channels (i.e. clients) at a GFP termination
point, and an eight-bit spare field reserved
for future use.
The use of this field is under consideration.
Similar to linear, the current proposal being
considered is to allow the sharing of the
GFP payload across multiple clients;
however, this would only apply to ring
configurations.
FTB-8100 Series Transport Blazer