EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 668)

Glossary
654 IQS-8100 Series Transport Blazer
Next-Gen - Generic Framing Procedure (GFP)
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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.
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Extension Header Identifier (EXI): A four-bit subfield identifying
the type of GFP extension header. Three kinds of extension
headers are currently defined:
PFI Description
0 FCS Absent
1 FCS Present
EXI Description Function
0000 Null Extension
Header
Indicates that no extension header is
present.
0001 Linear
Extension
Header
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.
0010 Ring Extension
Header
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.
0011
to
1111
Reserved