GFP-T vs GFP-F | Difference between GFP-T and GFP-F
This page compares GFP-T vs GFP-F and mentions difference between GFP-T and GFP-F modes. GFP is the short form of Generic Frame Protocol.
These are two adaptation modes used to carry client data in the GFP frames. GFP-F is applicable to most packet data types. GFP-T is applicable to 8B/10B coded signals.
• GFP-F maps each client frame into single GFP frame.
GFP-F is used where client signal is framed or
packetized by client protocol.
• GFP-F is the short form of Frame Mapped GFP.
• It is good for PDU-based protocols viz. ethernet, IP, MPLS or HDLC based protocols viz. PPP.
• Client PDU is placed in GFP payload field.
• GFP-T allows mapping of multiple 8B/10B
block coded client data streams into an efficient
64B/65B block code for transport within a GFP frame.
• GFP-T is the short form of Transparent GFP.
• It is good for protocols which exploit physical layer capabilities.
• GFP-T is transparent to codes such as 8B/10B, GbE, FICON, ESCON, DVB etc. Moreover GFP-T need not require entire PDU to be received.
The figure-1 depicts GFP-F and GFP-T frame structures. Following table mentions comparison GFP-T and GFP-F modes.
|Full form||Transparent GFP||Frame mapped GFP|
|Function||It maps bytes from frame to SONET frames.||It maps frames (such as ethernet) to SONET frames.|
|Encapsulation protocol level||Layer-1 (PHY)||Layer-2 (PDU)|
|Isocronic or delay sensitive||YES||NO|
|Optimized for||SAN, DVB||Ethernet|
|Statistical multiplexing of several client signals||NO||YES|
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