參數(shù)資料
型號(hào)： TC9205M
廠商： Electronic Theatre Controls, Inc.
英文描述： 5-Port 10/100/1000 Smart Ethernet Switch
中文描述： 5端口10/100/1000智能以太網(wǎng)交換機(jī)
文件頁(yè)數(shù)： 21/51頁(yè)
文件大小： 1661K
代理商： TC9205M
TC9205M
Preliminary Data Sheet
be completely disabled using shared configuration pin
DisBPBk
or EEPROM. In this case the switch will
start transmitting with minimum IFG after carrier sense is deasserted and followed after collision.
For carrier-based backpressure the switch will use the deferral mechanism rather than the collision
backoff mechanism. The transmit MAC will jam the line by sending continuous preamble. The link
partner will see the channel busy and thus it will defer transmission without imposing any additional
backoff delay. The jamming procedure will have short break to avoid jabber condition and the break will
also be short enough to prevent the other stations from starting transmission. Preamble can be sent this
way as long as necessary. If valid packets became available for transmission during this period then
jamming will be interrupted and the packets will be transmitted with standard IFG (Inter-Frame Gap). In
this case backpressure is executed the same way as collision based mechanism. Carrier based
backpressure can be selected using shared configuration pin
CrBP
or EEPROM.
Backpressure operation can be disabled globally using the shared configuration pin
DisBkPr
or per port
basis using the EEPROM.
By default forward pressure is also enabled whenever backpressure is
enabled. Forward pressure is executed only in extreme congestion conditions that normally do not occur
often. This flow control procedure is highly efficient in minimizing the packet loss. If desired, the forward
pressure can be disabled by the EEPROM setting.
If a HUB is connected to many workstations, one of the ports may be partitioned in heavy traffic when the
switch executes backpressure. TC9205M can prevent this by discontinuing the backpressure process
after a predefined number of consecutive collisions has reached. This function can be enabled using the
shared configuration pin
FullBP
or adjusting EEPROM setting. Unlike other settings, to enable this
feature the pin/bit should be set to '0'. The respective number of collisions defaults to 28 and can be
specified using the EEPROM. In addition, when this feature is enabled the MAC will either grant
receiving the next packet without colliding it, after which, it will resume the backpressure, or will
completely quit backpressure waiting for a new XOFF command from internal flow control management
device.
Confidential.
Copyright
2003, IC Plus Corp.
21/51
July 30, 2003
TC9205M-DS-R03
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