參數(shù)資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網(wǎng)核心(100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心)
文件頁數(shù): 121/130頁
文件大?。?/td> 770K
代理商: E-110
Glossary
A-3
Deference
Deference (or deferral length) is the time the MAC transmit function waits
for the network to be free before it can transmit. See also Excess
Deferral
Dribble Nibble
A nibble that is “extra” and occurs when, at the end of a frame, less than
a complete byte is received. It is possible to have one dribble nibble at
the end of a frame if a complete byte is not received.
End of Frame Delimiter
Three consecutive ones at the end of a frame that are not Manchester-
encoded; that is, they are non-return-to-zero bits that do not contain a tran-
sition in the middle of the bit time. The purpose of the end of frame
delimiter is to cause the phase-lock loop at the receiving station to lose
lock so the host can be notified that the frame has ended.
When a receiving node detects a bit that is not Manchester-encoded, it
considers the previous four bytes to be the FCS.
Ethernet LAN
A branching broadcast communications system for carrying digital data
packets among locally distributed computing stations. Ethernet is a
10-Mbit/s baseband, local area network that has evolved into the
IEEE 802.3 specification and is defined by a data-link protocol that spec-
ifies how data is placed on and retrieved from a common transmission
medium. Ethernet is used as the underlying transport vehicle by several
upper level protocols, including TCP/IP and Xerox Network System
(XNS). See IEEE 802.3/IEEE 802.3u
Excess Deferral
The time period when the media is busy longer than twice the maximum
frame size. When HUGEN is deasserted, the maximum frame size is
1518 bytes, so excess deferral in this case is:
1518 bytes x 8 bits/byte x 2 = 24,288 bits (242.88
μ
s at 100 Mbit/s or
2.4288 ms at 10 Mbit/s)
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