产品详情
6SL3352-1AG38-1FA1 6SN1123-1AB00-0CA2
6SL3352-1AG38-1FA1 6SN1123-1AB00-0CA2
6SL3352-1AG38-1FA1 6SN1123-1AB00-0CA2
工作原理
交换机工作于OSI参考模型的第二层，即数据链路层。交换机内部的CPU会在每个端口成功连接时，通过将MAC地址和端口对应，形成一张MAC表。在今后的通讯中，发往该MAC地址的数据包将仅送往其对应的端口，而不是所有的端口。因此，交换机可用于划分数据链路层广播，即冲突域；但它不能划分网络层广播，即广播域。
交换机拥有一条很高带宽的背部总线和内部交换矩阵。交换机的所有的端口都挂接在这条背部总线上，控制电路收到数据包以后，处理端口会查找内存中的地址对照表以确定目的MAC（网卡的硬件地址）的NIC（网卡）挂接在哪个端口上，通过内部交换矩阵迅速将数据包传送到目的端口，目的MAC若不存在，广播到所有的端口，接收端口回应后交换机会“学习”新的MAC地址，并把它添加入内部MAC地址表中。使用交换机也可以把网络“分段”，通过对照IP地址表，交换机只允许必要的网络流量通过交换机。通过交换机的过滤和转发，可以有效的减少冲突域。
端口
交换机在同一时刻可进行多个端口对之间的数据传输。每一端口都可视为独立的物理网段（注：非IP网段），连接在其上的网络设备独自享有全部的带宽，无须同其他设备竞争使用。当节点A向节点D发送数据时，节点B可同时向节点C发送数据，而且这两个传输都享有网络的全部带宽，都有着自己的虚拟连接。假使这里使用的是10Mbps的以太网交换机，那么该交换机这时的总流通量就等于2×10Mbps=20Mbps，而使用10Mbps的共享式HUB时，一个HUB的总流通量也不会超出10Mbps。总之，交换机是一种基于MAC地址识别，能完成封装转发数据帧功能的网络设备。交换机可以“学习”MAC地址，并把其存放在内部地址表中，通过在数据帧的始发者和目标接收者之间建立临时的交换路径，使数据帧直接由源地址到达目的地址。
数据传送的工作原理
交换机的任意节点收到数据传输指令后，即对于存储在内存里的地址表进行快速查找，从而对于MAC地址的网卡连接位置进行确认，然后再将数据传输到该节点上。如果在地址表中找到相应的位置，则进行传输；如果没有，交换机就会将该地址进行记录，以利于下次寻找和使用。交换机一般只需要将帧发送到相应的点，而无需如集线器发送到所有节点，从而节省了资源和时间，提高了数据传输的速率。
数据传送方式
通过交换的方式进行的数据传输，其实就是交换机的数据传送的方式。之前的集线器，更多是利用共享的方式，来对数据进行传输，没有办法从通讯的速度上进行要求。集线器的共享方式，也就是常说的共享式网络，以集线器作为连接设备并且只 有一个方向的数据流，因而网络共享的效率非常低。相对而言，交换机能够对连接到自身的各台电脑进行相应的识别，通过每台电脑网卡的物理地址也就是常说的MAC地址，来进行记忆和识别。在这样的前提之下，就不用再进行广播寻找，而能够直接将记忆的MAC地址找到相应的地点并且通过一个临时性专用的数据传输通道，来完成两个节点之间不受外来干扰的数据传输的通信。由于交换机还具有全双工传输的方式，所以也可以对于多对节点间通过同时建立临时的专用通道，来形成一个立体且交叉的数据传输通道结构。
ATV320D11N4B
TM221CE16T
TMH2GDB 各15个
171CCC76010 1 面价5736
6DT1043-0BA 1
25-ENC-2 面价580 4个
900-0GA00-0AD0 1
138-7FN00-0AB0 3
A5E02547143 1
FSP350-60EVML
153-2BB00-0XB0 5
15499-146 2
SQN90.570A2793 /50w 1
6FX3002-5CK01-1AD0 1
6FX3002-2DB20-1AD0 1
6SL3210-5FB10-2UF0 1
6AV6642-0DA01-1AX1 1
6ES7322-8BH10-0AB0 2
6RY1701-0AA04 2
6RY1801-0AA04 2
7PG1524-1JC60-1AF0 27
7PG1521-2JC60-1AF0 18
7PG1524-1GE60-1AF0 6
HIEE300890R0001数量4
UA C383 AE01
43GT-TMC25SL数量2 1362
MFE190-04UD-06A0-2
XBTGT2220 1
TSXP57103 2
TSXDEY16T2 2
RWF55.50A9 4
6ES7901-0BF00-0AA0 2
XD2GE121212121 3
LEM-AB-192T-21-NNNN 1个
EV2000-4T0220G1/0300P1 1
MPL-A320H-HJ72AA 1 面价20165
6ES5734-1BD20 - 1 pcs
6ES7221-3AD30-0XB0 - 2 pcs
6ES5 095-8MC02 - 1 pcs
6ES7647-6CH66-1JB0 1
主控板516.SY0001.05OP
主电源板516.SY0004.04
控制器连接板516.SY0006.04
接口板PIO0053.03
6AV6645-0DD01-0AX1 1
3HAC14363-1 1
220-1YD54-0CB0 1
6SR0900-0GA00-0AD0 - 1
A5E02547143 - 1
6ES5247-4UA21 5 pcs
3轴减速机;A97L-0218-0972#50;FANUC 1哥
ABB 1SBL387001R1300 - 2
T5H 400 PR222DS/P-LSI 1SDA054353R1 ABB - 2
T5H 630 PR222DS/P-LSI 1SDA054414R1 ABB - 1
Модуль ABB 1TGE107111D4008 - 1
TSXCUSB485 1
SPAJ140C-AA 1
TTG7123 2
"ABB" RELAY , Type:SPAJ140C-AA (1pc)
"ABB" RELAY , Type:TTG7123(2pcs)
6EP1332-1SH31 5
ABB电机-型号：3HAC024519-001/03 电机，适配IRB6640-180/2.55机器人本体；数量：1套
XBTF032110 2
138-4CF42-0AB0 2
193-4CK30-0AA0 2
6ES7953-8LG30-0AA0 128 KB 20
PRS45-600-70 1SFAB96111R7000 1
ATLAS COPCO 4204 0307 80 SERVO DRIVE
#SLS1C23 ATLAS COPCO Cable Approx 18' Extention #653WT
Atlas Copco Assembly Systems I/O Controller 4240 5002 01
Filter Replaces Atlas Copco 1616-5151
Filter Replaces Atlas Copco 1616-4656
Filter Replaces Atlas Copco 2911-0016
Atlas Copco BTV 11i Right Angle Battery Nutrunner 1/4" Hex Drive Torch Light
ATLAS COPCO POWER BOX 9040120204 USED
ATLAS COPCO 2101-S7-115R TENSOR S7 CONTROLLER , USED
Pneumatic Chipping Hammer Atlas Copco TEX419 (Brand New)
Filter replaces Atlas Copco PN 1202-6263-01
Brand New Atlas Copco Lip Seal Kit 2904-0070-00
*NEW* ATLAS COPCO DRILL PV271 Wench Engagement Arm 57658239
Filter replaces Atlas Copco PN 1202-6262-01
Atlas Copco 1619-2391-00 Level Guage 1619239100
K258939 ATLAS COPCO
Filter replaces Atlas Copco PN 1202-6414-00
Filter replaces Atlas Copco PN 1202-6414-01
Atlas Copco Servo Motor 99380313 Model E3340-5 Used
ATLAS COPCO POWER BOX GOOD 9040120201 (S3B)
Atlas Copco Transducer 1000.C 942015
ATLAS COPCO LTV-46 PNEUMATIC RIGHT ANGLE NUTRUNNER
ATLAS COPCO LTV-46 PNEUMATIC RIGHT ANGLE NUTRUNNER *
ATLAS COPCO LTV-46 PNEUMATIC RIGHT ANGLE NUTRUNNER **
ATLAS COPCO LTV46 PNEUMATIC RIGHT ANGLE NUTRUNNER ***
Atlas Copco 3300 RPM Pneumatic Pistol grip Palm Drill LBB 16 EPX033-U
Atlas Copco BTV 28i Right Angle Battery Nutrunner 3/8" Torch Light BTV28i-10
ATLAS COPCO LTV36 RIGHT ANGLE 3/8" DRIVE REVERSIBLE PNEUMATIC NUTRUNNER
ATLAS COPCO LTV27-S004-10 3/8" PNEUMATIC NUTRUNNER LTV 27 S004 10 CA-N9T S5
Filter replaces Atlas Copco PN 1202-5395-00
Filter replaces Atlas Copco PN 1202-6262-02
Filter replaces Atlas Copco PN 1202-8343-00
Filter replaces Atlas Copco PN 1202-8459-00
ATLAS COPCO AIR MOTOR LME22AR4 ~ USED
ATLAS COPCO 4220 1310 90 MANIJA, MOD. 4220-1310-90 MCA. ATLAS COPCO.
Filter replaces Atlas Copco PN 1030-1072-00
Atlas Copco Hose 0574-9841-18
ATLAS COPCO LST30 H100-13 random orbital sander
ATLAS COPCO LST32 H090-15 random orbital sander
AIRCRAFT TOOLS ATLAS COPCO AIR /PNEUMATIC PALM / PISTOL DRILL 3300rpm
ATLAS-COPCO HOUSING 1613-4123-00
Atlas Copco Compressed Air Filter Dryer w/ gauge 8102260562 NEW IN BOX
Enlarge
ATLAS COPCO 4230 1429 80 PLANETARY
ATLAS COPCO 4220 1007 10
#SLS1C23 ATLAS COPCO Cable 9040104410-10M #671WT
Atlas Copco Precision Torque Air Driver Strait Head
Atlas Copco Precision Air Driver Torque Pressure Clutch
Atlas Copco Replacement Multi-Tap Transber NEW!
Filter replaces Atlas Copco PN 1202-6259-03
Filter replaces Atlas Copco PN 1202-6268-02
ATLAS COPCO COMPRESSOR ALTERNATOR AX430 NT855 NEW
ATLAS COPCO COMPRESSOR ALTERNATOR AX430 NT855 NEW
Filter replaces Atlas Copco PN 1202-6281-02
ATLAS COPCO (9040-1001-04-50) 9810-0740-071 CABLE NEW !
ATLAS COPCO (9040-1001-05-15) CABLE ASSEMBLY NEW
ATLAS COPCO (9040-1001-04-60) CABLE ASSEMBLY NEW
4230129080 ATLAS COPCO
ATLAS COPCO POWER TOOL CABLE SE1983LB SCAN ELECTRONICS
ATLAS COPCO POWER BOX 9040120201 ~ USED - EXCELLENT
Filter replaces Atlas Copco PN 1202-6259-01
Filter replaces Atlas Copco PN 1202-6259-04
ATLAS COPCO 1202 6414 00 ED 3 1202641400ED3 OIL FILTER ELEMENT NEW
Atlas Copco 3300 RPM Pneumatic Pistol grip Palm Drill LBB 16 EPX033-U
Atlas Copco TEX 05 P Air Chipping Hammer (Oiler and Whip Hose included at NC)
ATLAS COPCO 1202-8506-00 BH21G17 HOSE ASSY, HOSE TUBE ASSEMBLY, OEM REPLACEMENT
Atlas Copco Torqe Driver, 540 RPM
ATLAS COPCO 1617-5380-03 RING SEAL / GASKET, OEM REPLACEMENT PART for AIR COMPRE
ATLAS COPCO 5199/20C Cable 90'Ft 519920C 057-3008-100 New
NEW ATLAS COPCO 4243 0070 05 CABLE 4243-0070
ATLAS COPCO LTV36 RIGHT ANGLE 3/8" DRIVE PNEUMATIC REVERSIBLE NUTRUNNER
ATLAS COPCO Pneumatic Air Pavement Breaker Jack Hammer AIR HAMMER ROCK DRILL 419
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9040101215 ATLAS COPCO
Filter replaces Atlas Copco PN 1310-0363-17
Filter replaces Atlas Copco PN 1310-2502-33
ATLAS COPCO ASSEMBLY 9810-0740-60 SPINDLE MOTOR CABLE
ATLAS COPCO 4240 0068 01 ANGLE MODULE Used
ATLAS COPCO Nutrunner Industrial surplus aircraft aviation tools
NEW ATLAS COPCO 4222-0321-00 PART 4222032100
ATLAS COPCO 9040104403-3M CABLE NEW
Filter replaces Atlas Copco PN 1310-0321-36
ATLAS COPCO FLOPPY DISK MODULE 4240 5001 00 ~ Used
ATLAS COPCO FLOPPY DISK MODULE 4240 5001 00
Filter replaces Atlas Copco PN 1202-6249-00
Filter replaces Atlas Copco PN 1202-6257-03
Filter replaces Atlas Copco PN 1202-6257-04
Filter replaces Atlas Copco PN 1202-8040-00
Filter replaces Atlas Copco PN 1202-8040-92
ATLAS COPCO SECOROC PILOT ADAPTER 503-7802,02-17
ATLAS COPCO Nutrunner Industrial surplus aircraft aviation tools
Filter replaces Atlas Copco 2900-0580-00
Filter replaces Atlas Copco 2900-0582-00
Atlas Copco Assembly System 4240 5009 00 Terminal Wiring Board
Atlas Copco Servo Controller M# 4240 0151-01 ~REPAIRED~
ATLAS COPCO I/O CONTROLLER 4240 5002 01
Atlas Copco screwdriver nutrunner pistol screw gun
Atlas Copco screwdriver nutrunner in line screw gun LUM10 PR12 inline
ATLAS COPCO - LUM 25 PR14 - ERGOLINE - AIR SCREWDRIVER
Atlas Copco Precision Torque Air Driver Strait Head
Atlas Copco Precision Torque Air Driver Strait Head
Atlas Copco Precision Torque Air Driver Strait Head
Inlet / Air Filter replaces Atlas Copco 1619-2799-00
Inlet / Air Filter replaces Atlas Copco 1619-2799-90
ATLAS COPCO 1/2 inch DRIVE AIR IMPACT WRENCH WORKS GREAT
ATLAS COPCO Nutrunner Industrial surplus aircraft aviation tools
ATLAS COPCO Nutrunner Industrial surplus aircraft aviation tools
ATLAS COPCO POWER FOCUS DC CONTROLLER 2101-S4-115R
Filter replaces Atlas Copco PN 1202-6257-01
Filter replaces Atlas Copco PN 1202-6257-02
ATLAS COPCO 9710-8699-08 DUAL CABLE ASSEMBLY FM1-4 NEW
PROFESSINAL ATLAS COPCO PNEUMATIC AIR YELLOW Straight DIE GRINDER 25000 RPM
Atlas Copco Air Compressor OEM Replacement Separator Element # 2900-0582-00
Filter replaces Atlas Copco PN 1202-6264-00
Filter replaces Atlas Copco PN 1202-6268-01
Filter replaces Atlas Copco PN 1310-0353-89
Filter replaces Atlas Copco PN 1030-0979-00
Atlas Copco Filter - replaces PN 1030-0979-99
Bit - Gas Sniffer Atlas Copco
ATLAS COPCO AIR POWERED PISTOL GRIP NUTRUNNER EP 6PT HR10/C
Atlas Copco 1619-2799-00
ATLAS COPCO Nutrunner Industrial surplus aircraft aviation tools
ATLAS COPCO 1613 6793 00 1613 6793 80 SOLENOID VALVE
ATLAS COPCO ASSEMBLY QUALIFIER CONTROLLER DISPLAY PANEL 487-066514 P-254-2 P2542
ATLAS COPCO ASSEMBLY QUALIFIER CONTROLLER CONTROL DISPLAY PANEL AQGFR-0B4 P254
ATLAS COPCO TENSOR S7 POWER FOCUS CONTROL N/R
ATLAS COPCO LTV26-SR006-10 RIGHT ANGLE 3/8" DRIVE REVERSIBLE PNEUMATIC NUTRUNNER
lot of 4 ATLAS COPCO NUTRUNNER BEARING SKF-ITALY03.T 6000 0502 1100 00
Atlas Copco Filter - replaces PN 1202-6255-01
Filter replaces Atlas Copco PN 1202-6255-02
Filter replaces Atlas Copco PN 1310-2503-45
#SLS1C23 ATLAS COPCO Cable 4231506701 6' Power Supply to Drive #659WT
Atlas Copco Case Ingersoll Rand Thermo King Alternator NEW
Atlas Copco Case Ingersoll Rand Thermo King *NEW* Alternator
New Atlas Copco Drain Valve Kit 2901 0219 00 2901021900
Allis Chalmers, Atlas Copco, Case, Deutz, International ALTERNATOR NEW
ATLAS COPCO SPINDLE CONTROL BOARD 4240 5000 01 - REPAIRED AND IN BOX
ATLAS COPCO SPINDLE CONTROL BOARD
ATLAS COPCO 2903-1011-00 AIR FILTER FOR AIR COMPRESSOR, OEM GENUINE - NEW NO BOX
Atlas Copco Connector 4230-1733-80 4230173380 Lot of 4
Atlas Copco pneumatic drill, nutrunner, LUM25, 1400 rpm
Atlas Copco 2906-0169-00 Oil Cooler Service Kit ZA3 ZA4
Atlas copco drive cat#QCM t340-25
