參數(shù)資料
型號： TC9205M-DS-R02
廠商： Electronic Theatre Controls, Inc.
元件分類： 圓形連接器
英文描述： Circular Connector; No. of Contacts:2; Series:; Body Material:Aluminum; Connector Shell Size:8; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:8-2
中文描述： 5端口10/100/1000智能以太網(wǎng)交換機
文件頁數(shù)： 20/51頁
文件大?。?/td> 1661K
代理商： TC9205M-DS-R02
TC9205M
Preliminary Data Sheet
6
Flow Control
Whenever the memory load exceeds preset thresholds, flow control commands are issued by the traffic
management entity to the transmit MACs to prevent overflow conditions occurred. The overrun
conditions are either locally or globally triggered, depending on the traffic management entity
configuration. Transmit MAC executed those flow control commands depending on the duplex mode
status. TC9205M executes backpressure for half duplex operation mode and it is IEEE 802.3x compliant
for full duplex operation mode. In special conditions forward-pressure is also executed to eliminate
packet loss.
For full duplex operation mode, TC9205M applies the XON/XOFF method using IEEE 802.3x PAUSE
frames. When a flow control command is internally generated, the transmit MAC inserts a pause frame
immediately or after the current transmission ends. On the receiving side, if a flow control frame is
received, the transmit MAC will stop transmission for a number of slot times, where the pausing time was
extracted from the received pause frame. The flow control function of the receiving side is always
operational unless is specifically disabled by EEPROM on a per port basis (if no EEPROM is present the
receive side flow-control is always operational), while transmission of the pause frames obeys the auto
negotiation result.
TC9205M recognizes flow control frames from the incoming frames and these frames should also have a
valid CRC. The IEEE 802.3x PAUSE operation reserved destination address, MAC control type and
PAUSE opcode (88-08-00-01). The chip filters all frames having PAUSE operation reserved DA
disregarding the other fields. If enabled, direct flow control addressing can be executed. This implies
inserting the port address as SA in each flow control frame generated by TC9205M and recognizing as
flow control all received frames with the port’s address as DA, MAC control type and PAUSE opcode.
After recognizing and executing appropriate flow control actions these frames will be also filtered. The
port address is obtained by adding the port’s number to the base address contained within EEPROM.
When no EEPROM is present and
DisFdFC
shared configuration pin is configured to high state, the
switch will inhibit its ability to send flow control packets on all ports while preserving its ability to receive
and act upon the incoming flow control packets. If this pin is configured to low state the switch will
execute symmetrical PAUSE operation as defined in 802.3x.
The function of enabling/disabling the flow control in the EEPROM is now available on a per port basis
rather than setting flow control globally for all ports and separate enabling/disabling flow control ability
can be performed on either receive or transmit side of a port.
TC9205M can be instructed to ignore the auto-negotiation result for full duplex flow control ability. When the
FrcFdFC
shared configuration pin or the equvalent register in the EEPROM is equal to 1, the link partner
will be considered to have full duplex flow control capable no matter of auto-negotiation result. The
FrcFdFC
setting is effective only for ports configured in 10/100 Mbps speed modes. When the
FrcGbFC
and the equivalent register in the EEPROM is equal to 1, the link partner will be considered symmetric and
asymmetric towards link partner full duplex flow control capable no matter of auto-negotiation result. The
FrcGbFC
setting is effective only for ports configured in 1000 Mbps speed mode.
The TC9205M executes backpressure algorithm for half duplex flow control, supporting both
collision-based and carrier-based backpressure. For collision-based backpressure the switch will be
forced to send collision signals to the terminal that sends packets to TC9205M. While TC9205M detects
an incoming frame that it wishes to backpressure with carrier sense signals, the switch will start
transmission to that port. If no packet is available at that moment for transmission then the MAC layer will
generate short jamming frames. Additionally, an aggressive backoff will be executed on the switch side
(by the transmit MAC) after each of the forced collisions. The transmit MAC will chose between 0 and 1
slot times to backoff. This will grant a fast recovery for the switch's congested port and will secure the
channel for the congested port in case it wishes to transmit (empty its buffers). If desired, the backoff can
Confidential.
Copyright
2003, IC Plus Corp.
20/51
July 30, 2003
TC9205M-DS-R03
相關(guān)PDF資料
PDF描述
TC9205M-DS-R03 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Crimp; Body Material:Aluminum; Series:PT06; No. of Contacts:3; Connector Shell Size:8; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Body Style:Straight
TCC0204-125 RF & Microwave Transistors VHF/UHF Applications(用于超高頻和甚高頻的RF和微波晶體管)
TCL100DC1-A 6 and 12 Volt, 75 to 450 Watts Wet Cell Lead Calcium Battery
TCL100DA1-A 6 and 12 Volt, 75 to 450 Watts Wet Cell Lead Calcium Battery
TCL100DA1-ACF1 6 and 12 Volt, 75 to 450 Watts Wet Cell Lead Calcium Battery
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC9205M-DS-R03 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5-Port 10/100/1000 Smart Ethernet Switch
TC9208 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:HIGH TENSION SUSTAINING ANALOG FUNCTION SWITCH
TC9208M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Port 10/100/1000 Smart Ethernet Switch
TC9208M-DS-R05 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Port 10/100/1000 Smart Ethernet Switch
TC9208M-DS-R06 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Port 10/100/1000 Smart Ethernet Switch
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*