參數(shù)資料
型號: LSIFC909
英文描述: LSIFC909 Fibre Channel I/O Processor technical manual v2.1 8/00
中文描述: LSIFC909光纖通道I / O處理器技術(shù)手冊2.1 8 / 00
文件頁數(shù): 30/144頁
文件大小: 1496K
代理商: LSIFC909
2-10
Fibre Channel Overview
2.7 Classes of Service
There are several classes of service in FC. The different classes are
distinguished from each other in three ways: by the level of guarantee for
data being delivered, the order in which data is delivered, and how data
flow control is maintained.
Class 1 is a dedicated connection between two N_Ports. The data
delivered is guaranteed with a required acknowledgement frame (ACK),
which a Class 1 device uses for flow control. All frames are received in
order.
Class 2 is a connectionless class. The data delivered is guaranteed with
an ACK. The frames can be received out of order. Class 2 uses both
ACK frames and the R_RDY ordered set for flow control.
Class 3 is also a connectionless class; however, the data being delivered
is not guaranteed. The frames can be received out of order. Class 3 uses
only the R_RDY ordered set for flow control.
Intermix is an enhancement of Class 1 service. A dedicated Class 1
connection may waste fabric bandwidth while frames are not being
transmitted or received between two N_Ports. In order to recover some
of this bandwidth, Intermix allows Class 2 and Class 3 frames to be
transmitted/received between Class 1 frames. N_Ports advertising
Intermix capability must be capable of receiving Class 2 and Class 3
frames from other N_Ports while maintaining the original Class 1 link.
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