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西门子交换机6AV7800-0BA00-2AB0 6AV7801-0BA00-2AB0
西门子交换机6AV7800-0BA00-2AB0 6AV7801-0BA00-2AB0
西门子交换机6AV7800-0BA00-2AB0 6AV7801-0BA00-2AB0
交换器
交换式的集线器
交换器即是交换式的集线器。交换器与集线器(HUB)在网路内的功用大致相同,其间最大的差异在于交换器的每个埠(port)都享有一个专属的频宽并具备资料交换功能,使得网路传输效能得於同一时间内所能传输的资料量较大;而集线器为则是所有的埠(port)共享一个频宽。
交换器说明:
交换器背面网络节点上话务承载装置、交换级、控制和信令设备以及其他功能单元的集合体。交换机能把用户线路、电信电路和(或)其他要互连的功能单元根据单个用户的请求连接起来。网络交换机(又称“网络交换器”),是一个扩大网络的器材,能为子网络中提供更多的连接端口,以便连接更多的计算机。
功能
交换器的主要功能包括物理编址、网络拓扑结构、错误校验、帧序列以及流控。交换机还具备了一些新的功能,如对VLAN(虚拟局域网)的支持、对链路汇聚的支持,甚至有的还具有防火墙的功能。
交换器除了能够连接同种类型的网络之外,还可以在不同类型的网络(如以太网和快速以太网)之间起到互连作用。如今许多交换器都能够提供支持快速以太网或FDDI等的高速连接端口,用于连接网络中的其它交换器或者为带宽占用量大的关键服务器提供附加带宽。
一般来说,交换器的每个端口都用来连接一个独立的网段,但是有时为了提供更快的接入速度,我们可以把一些重要的网络计算机直接连接到交换机的端口上。这样,网络的关键服务器和重要用户就拥有更快的接入速度,支持更大的信息流量。
学习功能:以太网交换机了解每一端口相连设备的MAC地址,并将地址同相应的端口映射起来存放在交换器缓存中的MAC地址表中。
转发过滤:当一个数据帧的目的地址在MAC地址表中有映射时,它被转发到连接目的节点的端口而不是所有端口(如该数据帧为广播/组播帧则转发至所有端口)。
消除回路:当交换器包括一个冗余回路时,以太网交换器通过生成树协议避免回路的产生,同时允许存在后备路径。
工作原理
交换机(交换器)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ARP协议学习他的MAC地址, 保存成一张交换表。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。
分类
交换机被广泛应用于二层网络交换, 中档的网管型交换机还具有VLAN划分,端口自动协商,MAC访问控制列表等功能,并提供字符界面或图形界面控制台,供网络管理员调整参数,高档的三层交换机则可以处理第三层网络层协议,用于连接不同网段,通过对缺省网段的产旬学习来建立两个网段之间的直接连接,四层交换机可以处理第四层传输层协议,可以将会话与一个具体的IP地址绑定,以实现虚拟IP,此外还有七层交换机。
与集线器区别
交换器与集线器不同之处是,集线器是物理层的设备,它会将网络内某一使用者传送之封包传至所有已连接到集线器的电脑;而交换器是数据链路层的设备,它则只会将封包传送到目的地的电脑(透过ARP协定),相对上能减少数据碰撞及资料被窃听的机会。交换器更能将同时传到的封包分别处理,而集线器则不能。
3BHE036348R0101 – 15
18779-HXP-1-(15K-5) 10
CV3100-4T0370M
MD290T 0.7G/1.1PB
MD800-0-4T22
MD800-0-4T41
MD800-1-4T13
MD800-1-4T5R5
MD800-2-4T4R8
MD800-2-4T9R5
变频器 ACS880-01-09A4-3 1个
变频器 ACS880-01-17A-3 1个
KM533A 1
BMXEHC0200H 1
NPBA-12 1
VLT2915PT4B20STR0DBF00A21C1 1
ACH580-01-033A-4 1
物资名称: 伺服电机
型号规格: 订货号:00492552 DSD2-071LO64U-45-54-EO9-TLP-K-AN-O-999 5.9kW S1 IP64 F 1
3ABD64606778 22
3ASC25H209 1
6SE7041-3TL84-1BH0 1
6SE7035-1EJ84-1BH0 1
6SE7037-0EK84-1BH0 1
343-5FA01-0XE0 1
RDS80004-H honeywell 2
BMXNOE0110 2
6DD1682-0CH3 1
SFCA128GH2AD4TO-I-LT-226-STD 1
FX3U-64MR/ES-A 數量4個
6SL3210-1PE33-7AL0 1
IC755CSS12CDB 1
HPU690/048M1
HPU690/061MB2P
各1
触屏控制器TPC6000-A122-TH-4G-SSD64G 1
KMD-7001 1
Press filter 3AFV9876899 for ABB Azipod installation 2个
Oil filter 3AFV9911016 for Azipod ABB installation 2个
Filter element AF3000-02D for ABB Azipod installation 1个
Filter element AFM3000-02D for ABB Azipod installation 1个
Press filter 3AFV9876899 for ABB Azipod installation 1个
Filter element 3AFV9879988 for ABB Azipod installation 1个
3BSE056899R1, 1个
3BSE013238R1, 1个
6SE6400-7AA00-0BA0 1
TAMAGAWA TS2014-N182E32 1 (要未税价)
6SE6430-2UD31-1CA0 1
FR-A8NPRT-2P 40个
SKM150GB07E3 24
A20B-3300-0600/04B 1
VM42A00200001A0000 1
EL6731 1
6SL3995-6AC10-0AA0 1
Eaton AE16NN0 版本A1 1个
Eaton CE55NN3 版本A1 1个
6ES7405-0KR02-0AA0 1 (要未税价)全新原装
1SDA058321R1 18pcs
RD238-137 5pcs
DSD2-071LO64U-45-54-EO9-TLP-KAN-O-999 3
6AV2123-2MB03-0AX0 1 (要未税价)全新原装
A06B-2085-B107
A06B-2075-B107 各2
6SE7034-6EE85-1JA0 1
C98043-A1682-L 1
2094-BC07-M05-S 1 个 90436
2198-P141 1 个 29322
2198-S086-ERS3 2 个 36689
1606-XLP25A 1 个 1367
PMM-BD-5702-4 1
Telemecanique XY2CD01 35
DANMOTION E32NRFP-LNS-NS-02 1
(要未税价)
DCM1500S 2 巴基斯坦
6FX2007-1AD03数量1
MC07B0075-5A3-4-S0数量1
MC07B0075-5A3-4-00
General Electric FKN36NE125SSF - 1
6ES7451-3AL00-0AE0 3
BRONKHORST L23-PGD-33-K-70S - 1
Honeywell DC2501-EE-1L0R-200-10000-E0-0 - 1
Shuft PS-500 L - 2
Belimo R2050-25-S4 - 2
Belimo SR24A-SR 0-10В - 1
Ziehl Abegg FE091-SDS.6N.6 - 1
Ziehl-abegg FN045-VDD.4F.A7P1 - 1
ASCO NFX8327B012 - 1
MC220L
Make: TP LINK
15Nos
SCFV160*400FAH-JX151C
02Nos
BTL7-E100-M0175-B-KA05 BTL06YR 1
BTL7-E100-M0150-B-KA05 BTL06YN 1
BTL-P-1013-4R BAM013L 2
General Electric品牌
SELA36AI007 4PCS
SRPE7A3 2PCS
TCAL18 24PCS
SRPE7A7 2PCS
A5E32855090 3
AIA10000350.00MREVBG 1
A5E03931016 1
A1A0100275 3
802T-ATP 4 2063
ABB变频器功率单元 POWER CELL ABB ACS580MV_PEBB_R5 Material Number:2UBA004416R005
Serial Number:2UBA915280003
各1
REXA-CR06550 1
KORB 06D1 1
7SJ6825-5EW20-3FE0/CC 1
LLCSRLT6RZ25S12 1
1)GEMINI GT6K-L5 ---1ea
2)NE34-015-LB ---1ea
3)ZETA83-135 ---1ea
9007FTUB4M11 5个
高速计数模块, BMXEHC0200
ASEA BROWN BOVERI OHY1AH1 NSFP OHY1AH1
ASEA BROWN BOVERI CBK-KLFL8G NSFP CBKKLFL8G
ASEA BROWN BOVERI M2SS1-10B NSFP M2SS110B
ASEA BROWN BOVERI S271-K6A USPP S271K6A
ASEA BROWN BOVERI S201-K10 USPP S201K10
ASEA BROWN BOVERI S272-K3A USPP S272K3A
ASEA BROWN BOVERI S271-NA-K3 USPP S271NAK3
ASEA BROWN BOVERI CA531N FNFP CA531N
ASEA BROWN BOVERI 68226716 NSFP 68226716
ASEA BROWN BOVERI 05402 NSFP 05402
ASEA BROWN BOVERI 05415 NSFP 05415
ASEA BROWN BOVERI CBK-PL NSFP CBKPL
ASEA BROWN BOVERI CBK-PL NSFP CBKPL
ASEA BROWN BOVERI CBK-PL NSPP CBKPL
ASEA BROWN BOVERI CBK-S2KM45 NSFP CBKS2KM45
ASEA BROWN BOVERI CL-502R NSFP CL502R
ASEA BROWN BOVERI CBK-MPG10 NSFP CBKMPG10
ASEA BROWN BOVERI CBK-XSA NSFP CBKXSA
ASEA BROWN BOVERI OSS160T1 NSFP OSS160T1
ASEA BROWN BOVERI CC501 NSFP CC501
ASEA BROWN BOVERI S271-K1.6-1.6 NSFP S271K1616
ASEA BROWN BOVERI OXP5X500 NSPP OXP5X500
ASEA BROWN BOVERI S261-B13-N USPP S261B13N
ASEA BROWN BOVERI S281-K10 NSFP S281K10
ASEA BROWN BOVERI S263-B6 NSFP S263B6
ASEA BROWN BOVERI S272-K1.6 NSFP S272K016
ASEA BROWN BOVERI S272-K4 NSPP S272K4
ASEA BROWN BOVERI S262-B10 NSPP S262B10
ASEA BROWN BOVERI OHY2AJ USPP OHY2AJ
ASEA BROWN BOVERI OX120 USPP OX120
ASEA BROWN BOVERI K5VD-S12 NSFP K5VDS12
ASEA BROWN BOVERI S201U-K20 NSPP S201UK20
ASEA BROWN BOVERI S201U-K20 USPP S201UK20
ASEA BROWN BOVERI S201-UK6 USPP S201UK6
ASEA BROWN BOVERI 1SFA616075R1002 USPP 1SFA616075R1002
ASEA BROWN BOVERI 1SFA616070R4011 USPP 1SFA616070R4011
ASEA BROWN BOVERI 1SFA616070R4012 USPP 1SFA616070R4012
ASEA BROWN BOVERI 1SFA616070R4013 USPP 1SFA616070R4013
ASEA BROWN BOVERI 1SNA608017R0600 USPP 1SNA608017R0600
ASEA BROWN BOVERI MS325-BB1 NSFP MS325BB1
ASEA BROWN BOVERI S263C10 USPP S263C10
ASEA BROWN BOVERI S263C6 USPP S263C6
ASEA BROWN BOVERI S271-Z16 USPP S271Z16
ASEA BROWN BOVERI S273K3A USPP S273K3A
ASEA BROWN BOVERI MCBH001 USPP MCBH001
ASEA BROWN BOVERI ML1-100R USPP ML1100R
ASEA BROWN BOVERI ZA16-84 USPP ZA1684
ASEA BROWN BOVERI CBK-3ML USPP CBK3ML
ASEA BROWN BOVERI S2C-H6R USPP S2CH6R
ASEA BROWN BOVERI S201-B13 USPP S201B13
ASEA BROWN BOVERI S201-C16 NSPP S201C16
ASEA BROWN BOVERI K4TC NSFP K4TC
ASEA BROWN BOVERI KA18030 NSFP KA18030
ASEA BROWN BOVERI KA22221 NSFP KA22221
ASEA BROWN BOVERI KA22223 NSFP KA22223
ASEA BROWN BOVERI MPMP3-10R NSFP MPMP310R
ASEA BROWN BOVERI 155S919 NSPP 155S919
ASEA BROWN BOVERI S271-K-10-NA USPP S271K10NA
ASEA BROWN BOVERI S271-K-4-NA USPP S271K4NA
ASEA BROWN BOVERI S272-K-20-A USPP S272K20A
ASEA BROWN BOVERI S281-K-10-NA USPP S281K10NA
ASEA BROWN BOVERI S281-K-16-NA USPP S281K16NA
ASEA BROWN BOVERI KB30 USPP KB30
ASEA BROWN BOVERI S1N0-40TL USPP S1N040TL
ASEA BROWN BOVERI CBK-KPR NSPP CBKKPR
ASEA BROWN BOVERI S272-K4 NSFP S272K4
ASEA BROWN BOVERI RVBC660 USPP RVBC660
BROWN BOVERI POWER SUPPLY MODULE BOARD YYE109A 7D YT212001-AB/4 ASEA ROBOTICS
HEAT SHOCK PROTEINS AND THE - IAN R. BROWN ALEXZANDER A. A. ASEA (PAPERBACK) NEW
ABB ASEA BROWN Boveri RXEC 1 RK426 132AE X 50V Relay with Base
Brown Boveri ASEA GR-5 202D6162 Ground Fault Relay NOS
NEW ASEA BROWN BOVERI CIRCUIT SHIELD OVERCURRENT RELAY 120V 50/60HZ 93-3826
AE5030, Asea Brown Boveri Contatoi Contactor 100A
BROWN BOVERI LATCH & CABLE YB161101-CL YB161101CL DSQU134 ASEA ROBOTICS
BROWN BOVERI BOARD DSQC103 2668 180-141/2 ASEA ROBOTICS
BROWN BOVERI LATCH & CABLE YB161101-CL YB161101CL DSQU134 ASEA ROBOTICS
7 pack of 2 each NEW ABB 1sfn010720r1011 Cal 18-11 ASEA BROWN BOVERI total 14
ABB ASEA BROWN Boveri RVZP 20 Overload Relay RVZP20 SK 422 0029
ASEA BROWN BOVERI YYT-102E SERVO CONTROL BOARD 2668 18-586 YYT 102E
NEW ASEA ABB BROWN SK 819 003-D AUX AUXILIARY CONTACT BLOCK 500V 0.5A 3PH 28864
ABB Asea Brown Boveri S272-K16A Circuit Breaker 277/460
Asea Brown Boveri Keypad YB 161 100-BB/1 #38476
Asea Brown Boveri GRC 202K9301-UL Adjustable Ground Fault Relay 24/32VDC PLC ABB
BROWN BOVERI RACK FILLER BOARD DSRB110 52841637-G ASEA ROBOTICS
BROWN BOVERI COIL RELAY RXMM1 RXMM 1 RK214002-AD ASEA ROBOTICS
BROWN BOVERI COIL RELAY RXMM1 RXMM 1 RK214002-AD ASEA ROBOTICS
ABB ASEA BROWN BOVERI 3BSE-004265R1 3 OUTLET ADDITION 120VAC RECEPTACLE 44281
NEW ABB ASEA BROWN BOVERI 612B091U07 MOUNTING BRACKET KIT FOR FIELD 40532
ABB/ Asea Brown Boveri Type A1D FM25 Solid State Watthour Meter, Class 200
Asea Brown Boveri Contactor 27A 110-120VAC 60HZ 3 Pole 600VAC MAX EG30/30-1 NIB
ABB Asea Brown Boveri BC9/CA7-22E Contactor
ABB Asea Brown Boveri BC9-30-10 Contactor
Asea Brown Boveri ABB S3N050TW 50 A Circuit Breaker
ABB Soft Starters PSR Series PSR3-600-70 ASEA BROWN BOVERI 1SFA896103R7000
ASEA BROWN BOVERI ABB S283 k 8A din rail
FT-1 Flexitest Switch C498A010G01 Ser A Asea Brown Boveri New
Asea Brown Boveri ABB 16 Amp Din Rail 3 Pole Circuit Breaker S273 K16A
SSAC TSB222 Solid State Timer .5-60 second 24vac abb asea brown NEW
26549 NEW ASEA Brown Boveri S262-C4 Circuit Breaker 4A
ASEA BROWN BOVERI RTXG16-1 RK924 008-AA Lot Of 4
ABB Asea Brown Boveri 25 Amp Circuit Breaker S282k25A
ASEA BROWN BOVERI ABB S282 Z 20A din rail
2 pack of 2 each NEW ABB 1SBN010020R1011 CAL5-11 ASEA BROWN BOVERI total 4
ASEA BROWN BOVERI ABB S282 Z 16A din rail
ASEA BROWN BOVERI ABB S282 Z 3A din rail
Asea Brown Boveri Load Break Switch Non-Fused OT16E3 NIB
ASEA BROWN BOVERI RTXG8-1 RK 924 007-AA Lot Of 3
ASEA BROWN BOVERI ABB S262 d32 din rail
ASEA BROWN BOVERI ABB S262 K10A din rail
Asea Brown Boveri Load Break Switch Non-Fused OT16E3
Asea Brown Boveri(ABB) ACS-CP-C Basic Control Panel for Motor Drives/Inverters
ABB 1SVR430811R1300 CM-MSS THERMISTOR RELAY 220-240VAC ASEA BROWN BOVERI
Asea Brown Boveri Thermal Overload Relay TA25DU-1.4
Asea Brown Boveri Din Rail ABB Single Pole 6 Amp Circuit Breaker Switch S281 Z6A
Asea Brown Boveri S261B6 Circuit Breaker 6amp
Asea Brown Boveri T25DU25 Thermal Relay NIB
Asea Brown Boveri T25DU11 Over Load Relay NIB
Asea Brown Boveri ABB Din Rail Circuit Breaker 6 Amp Single Pole S271 K6A
Asea Brown Boveri ABB Din Rail Circuit Breaker 2 Amp Single Pole S271 K2A
Asea Brown Boveri ABB Din Rail Circuit Breaker 1.6 Amp Single Pole S271 K1.6A
Asea Brown Boveri ABB Din Rail Circuit Breaker 10 Amp Single Pole S271 K10A
USA NEW YORK 32594 POSTCARD ASEA BROWN BOVERI TRAIN ABB ELMIRA HEIGHT RAILROAD
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TRAINS, 4 ON DISPLAY AT ELMIRA HEIGHTS NY,ABB,ASEA BROWN BOVERI, CHROME POSTCARD
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Asea Brown Boveri ABB Train Postcard Elmira Heights NY
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ASEA BROWN BOVERI IRB6000-5261 USPP IRB60005261
ASEA BROWN BOVERI ACS60402105000B00009R1 NSFP ACS60402105000B0
ASEA BROWN BOVERI ACS800-U4-0210-5-D150-L503 USPP ACS800U402105D11
ASEA BROWN BOVERI ACS550-U2-368A-4 USPP ACS550U2368A4
ASEA BROWN BOVERI DPH50051 USPP DPH50051
ASEA BROWN BOVERI 56157158 NSFP 56157158
ASEA BROWN BOVERI ACS601-0140-S00B1200901 USPP ACS6010140S00B12
ASEA BROWN BOVERI E3N32FAHOA00EXX NSFP E3N32FAHOA00EXX
ASEA BROWN BOVERI E3S25BBHEA00EXX NSFP E3S25BBHEA00EXX
ASEA BROWN BOVERI M2AA-250-SMA-3GAA254001-ADA.02.413 NSFP M2AA250SMA3GAA25
ASEA BROWN BOVERI ACS60402605000B0000901 USPP ACS60402605000B0
ASEA BROWN BOVERI ACS604-0260-5-00002000900 USPP ACS6040260500002
ASEA BROWN BOVERI M2AA-200-MLA-3GAA202001-ADA-158-02 NSFP M2AA200MLA3GAA20
ASEA BROWN BOVERI 5409351 USPP 5409351
ASEA BROWN BOVERI 3BHL000462R0050 NSPP 3BHL000462R0050
ABB ASEA BROWN BOVERI POWER ITE AIR CIRCUIT BREAKER 800A 800 AMP KDON K-DON 800S
ASEA BROWN BOVERI ACH504-060-4-00P0 USPP ACH504060400P0
ABB ASEA BROWN BOVERI K-LINE POWER AIR CIRCUIT BREAKER 800A 800 AMP A KDON KD0N
ASEA BROWN BOVERI M2AA-160-L-3GAA162102-ADA.158.02 NSFP M2AA160L3GAA1621
ABB Asea Brown Boveri V032 Motor Controller Drive V032
ASEA BROWN BOVERI M2AA160L4 NSPP M2AA160L4
ASEA BROWN BOVERI CPTA-60-10-2400-D149 NSFP CPTA60102400D149
ASEA BROWN BOVERI CPTA-60-10-2400-D149 NSPP CPTA60102400D149
ABB ASEA BROWN BOVERI DRH-10050 SERVO DRIVE
ASEA BROWN BOVERI DSQC 314B REMAN DSQC314B 3HAB2216-1