Fujitsu MJA2500BH Maintenance Manual - Page 86
Communication layers, Contains a Shadow Block Register.
View all Fujitsu MJA2500BH manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 86 highlights
Interface 5.2.1 Communication layers Each of the layers is outlined below. Physical layer • Detects, sends, and receives band signals. • Sends serial data to and receives it from the link layer. Link layer • Negotiates against mutual transfer requests between the host system and device. • Encodes serial data as 10- or 8-bit data, then converts it into DWORD data. • Inserts auxiliary signals (SOF, CRC, and EOF), deletes auxiliary signals, and communicates with the transport and physical layers. Transport layer • Exchanges data in communication with the link layer, and builds the frame information structure (FIS). • Contains a (Shadow) Block Register. • Reflects the FIS contents to the Block Register. 5-12 C141-E293
Interface
5-12
C141-E293
5.2.1
Communication layers
Each of the layers is outlined below.
Physical layer
•
Detects, sends, and receives band signals.
•
Sends serial data to and receives it from the link layer.
Link layer
•
Negotiates against mutual transfer requests between the host system and
device.
•
Encodes serial data as 10- or 8-bit data, then converts it into DWORD data.
•
Inserts auxiliary signals (SOF, CRC, and EOF), deletes auxiliary signals, and
communicates with the transport and physical layers.
Transport layer
•
Exchanges data in communication with the link layer, and builds the frame
information structure (FIS).
•
Contains a (Shadow) Block Register.
•
Reflects the FIS contents to the Block Register.