Fujitsu MAT3300FC 用户手册

1.2 Information Transmitted on the Loop

C141-C008

1-5

1.1.6 Buffer-to-buffer frame transfer

As shown in Figure 1.3, data transmission occurs from an output buffer in the
node part to an input buffer in the node port.

The basic unit of buffer-to-buffer transfer is the frame.

Transmit Buffer

Receive Buffer

8bit

8B/10B Encoder

8B/10B Decoder

Serializer

Deserializer

in NL_Port

Serial Transfer on FC loop

in NL_Port

Figure 1.3 Buffer-to-buffer frame transfer

1.2 Information Transmitted on the Loop

This section explains the “Ordered Sets” and “Frame” propagated on the loop.

Since information is exchanged between the ports through serial signals, both
loop control information and information at user level are defined in frame
format.

The information on the loop is categorized into two groups.

One is “ordered sets” and the other is called “frame”.

Ordered sets consist of four 10-bit character to control port circuit mainly.

And the frame consists of FC-4 Device Data for SCSI protocol and Link Data to
control Fibre Channel layer.

The communication between the ports is done by using the frame defined in FC-
PH.

The frame has the port address of source and destination, frame control
information and user protocol (SCSI-Command, data and etc.) information.