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2.2 FC Layers
2-2
Figure 2.1
FC Layers
Behaviors
System
Interface
Logical
Layers
Physical
Layers
MBytes/s
The lowest layer, FC-0, is the media interface layer. It defines the
physical characteristics of the interface. It includes transceivers,
copper-to-optical transducers, connectors, and any other associated
circuitry necessary to transmit or receive at 1062 or greater Mbaud/s
rates over copper or optical cable.
The FC-1 layer defines the 8b/10b encoding/decoding scheme, the
transmission protocol necessary to integrate the data and transmit clock,
and the receive clock recovery. Implementation of this layer is usually
divided between the hardware implementing the FC-0 layer in a
transceiver, and the protocol device which implements the FC-2 layer.
Specifically, the FC-0 transceivers can include the clock recovery circuitry
while the 8b/10b encoding/decoding is provided in the protocol device.
The FC-2 layer defines the rules for the signaling protocol and describes
transfer of the Frames, Sequences, and Exchanges. The meaning of the
data being transmitted or received is transparent to the FC-2 layer.
However, the context between any given set of frames is maintained at
Fibre Channel Overview
Copyright © 2000, 2001 by LSI Logic Corporation. All rights reserved.
Upper Layer Protocol (ULP)
FC-4
FCP
IPI-3
Common Services - e.g.,...Striping (not defined)
FC-3
Framing Protocol/Flow Control
FC-2
FC-1
FC-0
1062
Mbits/s
100
HIPPI
ESCON
8b/10b Encode/Decode
2124
4248
(Full Duplex)
200
400
IP
8496
FC-PH-2
800
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