西門子觸摸屏6AV6542-0DA10-0AX0

西門子觸摸屏6AV6542-0DA10-0AX0

以太網(wǎng)技術(shù)的zui初進(jìn)展來自于施樂帕洛阿爾托研究中心的許多先鋒技術(shù)項(xiàng)目中的一個(gè)。人們通常認(rèn)為以太網(wǎng)發(fā)明于1973年，當(dāng)年羅伯特·梅特卡夫(Robert Metcalfe）給他PARC的老板寫了一篇有關(guān)以太網(wǎng)潛力的備忘錄。但是梅特卡夫本人認(rèn)為以太網(wǎng)是之后幾年才出現(xiàn)的。在1976年，梅特卡夫和他的助手David Boggs發(fā)表了一篇名為《以太網(wǎng)：局域計(jì)算機(jī)網(wǎng)絡(luò)的分布式包交換技術(shù)》的文章。1977年底，梅特卡夫和他的合作者獲得了“具有沖突檢測的多點(diǎn)數(shù)據(jù)通信系統(tǒng)”的。多點(diǎn)傳輸系統(tǒng)被稱為CSMA/CD（帶沖突檢測的載波偵聽多路訪問），從此標(biāo)志以太網(wǎng)的誕生。

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1979年，梅特卡夫?yàn)榱碎_發(fā)個(gè)人電腦和局域網(wǎng)離開了施樂，成立了3Com公司。3com對(duì)迪吉多，英特爾，和

以太網(wǎng)插頭

施樂進(jìn)行游說，希望與他們一起將以太網(wǎng)標(biāo)準(zhǔn)化、規(guī)范化。這個(gè)通用的以太網(wǎng)標(biāo)準(zhǔn)于1980年9月30日出臺(tái)，當(dāng)時(shí)業(yè)界有兩個(gè)流行的非公有網(wǎng)絡(luò)標(biāo)準(zhǔn)令牌環(huán)網(wǎng)和ARCNET，在以太網(wǎng)大潮的沖擊下他們很快萎縮并被取代。而在此過程中，3Com也成了一個(gè)化的大公司。

梅特卡夫曾經(jīng)開玩笑說，Jerry Saltzer為3Com的成功作出了貢獻(xiàn)。Saltzer在一篇與他人合著的很有影響力的論文中指出，在理論上令牌環(huán)網(wǎng)要比以太網(wǎng)*。受到此結(jié)論的影響，很多電腦廠商或猶豫不決或決定不把以太網(wǎng)接口做為機(jī)器的標(biāo)準(zhǔn)配置，這樣3com才有機(jī)會(huì)從銷售以太網(wǎng)網(wǎng)卡大賺。這種情況也導(dǎo)致了另一種說法“以太網(wǎng)不適合在理論中研究，只適合在實(shí)際中應(yīng)用”。也許只是句玩笑話，但這說明了這樣一個(gè)技術(shù)觀點(diǎn)：通常情況下，網(wǎng)絡(luò)中實(shí)際的數(shù)據(jù)流特性與人們?cè)诰钟蚓W(wǎng)普及之前的估計(jì)不同，而正是因?yàn)橐蕴W(wǎng)簡單的結(jié)構(gòu)才使局域網(wǎng)得以普及。梅特卡夫和Saltzer曾經(jīng)在麻省理工學(xué)院 MAC項(xiàng)目（Project MAC）的同一層樓里工作，當(dāng)時(shí)他正在做自己的哈佛大學(xué)畢業(yè)論文，在此期間奠定了以太網(wǎng)技術(shù)的理論基礎(chǔ)。

IDEAL 85491 RG-58 BNC PLUG TWIST-ON PLUG PVC, BAG OF 5, NEW IN BAG
 
HUBBELL 120/277VAC 20A SINGLE POLE TOGGLE SWITCH, HBL1221GY *NEW*
 
RELIANCE ELECTRIC 115VAC/DC DUAL INPUT MODULE 45C40
 
MICRO SWITCH 15A ROLLER PLUNGER MICRO SWITCH BZ-2RQ18-A2 *NEW*
 
PEPPERL + FUCHS 24-240/250VAC, 12-240VDC PHOTOELECTRIC SENSOR FE7D-RPR7 *NEW*
 
TAPER SHANK HIGH SPEED STEEL BLACK OXIDE PTD 27/32 HSS BRAZIL
 
ABB CIRCUIT BREAKER S281 K 20A
 
ACME 2000VA 240 X 480PR 60HZ DRY TYPE DISTRIBUTION TRANSFORMER T 2-53012-S *NIB*
 
COOPER CROUSE-HINDS 600V 8A 6P 6' FEMALE PLUG CORDSET, X8987-4C *NEW*
 
MENCOM * 3-PIN/F CABLE ASSEMBLY NIB * MAC-3FP-12
 
FUJI ELECTRIC CIRCUIT PROTECTOR 15A 250V 1KA 41-20112
 
TURCK 20-250VAC/DC PROXIMITY SWITCH Bi2-CRS260-ADZ3?0X2-B1131/S34
 
FABCO AIR THE PANCAKE LINE AIR VALVE 14SP-3
 
ACCUSPEC CAPACITOR 020190 220 Ohm 1/2WATT 104X122CA-002
 
FLAME RESPONSE 3 SEC R7023 B 1003
 
DELTA CONTROLS MODEL 852 LEVEL TRANSMITTER 852D-1-4X-LE
 
TPC WIRE & CABLE 4 POLE MALE 90° DC MICRO CONNECTORS, 39700 *NEW LOT OF 9*
 
LUMBERG CONNECTOR RSF50-677/1FT NNB LOT OF 8
 
SHOPLOGIX INC. RELAY ISN-075-DEV3-00?0005
 
HIRSCHMANN RS2-TX 8 PORT ETHERNET RAIL SWITCH
 
ROBOTRON ROBOTRON ROLLER HEAD LIMIT SWITCH T-GWA 1 R
 
IDEC 10AMP 300V 8PIN RELAY SOCKET BASE LOT OF 4 SH2B-05
 
ALLEN BRADLEY WHITE PUSHBUTTON W/ TRANSFORMER AND CONTACTORS 800E-2T5
 
CKD VALVE AB21-D2-2-2
 
ATLAS COPCO 5/8" DRIVE NUTRUNNER 4220 3752 11 / QMR62-46-RT / QRT 62-200
 
TURCK 250V 4A 4PIN STRAIGHT MALE/FEMALE CORDSET, RKC 4.4T-2-RSC 4.4T *NEW*
 
SCC STATIC CONTROLS CORPORATION OPERATOR INTERFACE 1080-P4-14-128-?C-FN
 
UB TAP PIPE TAPER HSS 1/4-18NPT
 
ALLEN BRADLEY 1 AMP 3 POLE CIRCUIT BREAKER LOT OF 7 1492-ACB SER B
 
FESTO 8 PIN DISTRIBUTOR PORT MPV-E/A-08-M8 NIB
 
YOKOGAWA 0-600 DC AMPERES GAUGE 251300DRDR7JLA
 
SOLO ELECTRIC GS TRANSFORMER 83--24-260-2
 
DORMEYER LAMINATED SOLENOID 2006-M-1 NNB
 
ENLIN FLANGE END CAP A/SA182 F316L/316 150B16.5 4 8L3J0
 
ALLEN BRADLEY * DEVICENET CORDSET * 1485R-P5M5-C SER. A
 
ALLEN BRADLEY 3 POSITION SELECTOR SWITCH 800T-J2KU7 SER T
 
RADISYS 85-250V INPUT 1.0A POWER SUPPLY, EMC-PS5-AC *NEW*
 
SICK PHOTOELECTRIC REFLEX SWITCH EL3-P2428 1044704 NIB
 
GENERAL ELECTRIC 200A 3P 600VAC FUSIBLE INTERRUPTER QMR364
 
HAROWE HAROSYN-RW RESOLVER 11BRW-300-M-10B
 
16A 690V ON/OFF SWITCH IEC/ EN 60947-3
 
HUBBELL 3/4" STRAIN RELIEF CONDUIT GRIP NIB 074093513
 
MODICON CABLE ASSEMBLY AS-W804-006 *NEW IN BOX*
 
TURCK * 3-PIN M/F 22AWG CABLE ASSEMBLY NIB * KB 3T-6-SB 3T
 
UNITED ABRASIVES TYPE 1 BENCH GRINDER WHEEL SAIT 28023
 
ABB CA7-40K W/ ABB TBC25
 
ROSS 3/2 NORMALLY CLOSED SINGLE SOLENOID PILOT 2773B6011

    
REAL POWER 115/230VAC 60/50Hz POWER SUPPLY RPS-7230
 
SUMITOMO HEAVY INDUSTRIESBACKP?LANE CHASSIS WITH BPIS SA765265AD/SA76?5266AX
 
FANUC PERTRONICS 0.1KVA TRANSFORMER A80L-0010-0071-?02
 
VICTAULIC PIPE HOUSING 10" ID STYLE 995
 
UNKNOWN MFG * 208/220V 60CYC COIL NIB * TB10-2
 
UNION BUTTERFIELD TAP 5/16-18 H3 2F PLUG SP PT
 
KASUGA TRANSFORMER 500 VA DVSE500
 
HEIDENHAIN CONNECTING CABLE 298400-07
 
NACHI TEACHING CONTROLLER RTC221
 
GENERAL ELECTRIC PANEL METER 50-255320RXRX1J?AF
 
TWECO POSITIVE-CAM CABLE CONNECTOR COMPLETE 2-MPC
 
PARKER 1" ROD SEAL KIT RK2AHL0101
 
MOELLER MANUFACTURING CO. CIRCUIT BREAKER FAZNS1
 
APPLETON 1 1/2 X UNILET FORM 35
 
WESTINGHOUSE PPD VOLTAGE TRANSFORMER 7526A05G04
 
BINDICATOR BIN-LEVEL INDICATOR A-1-MN
 
WEISS PRESSURE GAUGE 0-150 F
 
RELIANCE ELECTRIC 3.38V 100A TRANSMITTER 600595-13AD *NEW*
 
2" VALVE T250G
 
ALLEN BRADLEY 509-TOA SER B NEMA SIZE 00
 
BARNES 1/2 HUB SIZE CONDUIT CONNECTOR BAG OF 2 17441
 
ELECTRICAL CONNECTOR 0-250VAC LOT OF 2 TYPE 2508
 
LITFUSE 6-1/4A 600V POWR-GARD FUSE FLSR 6-1/4 *LOT OF 6*
 
WESTINGHOUSE 300V BF CONTROL RELAY BF22F NIB
 
MOORE CIRCUIT BOARD 15936-11-3
 
TURCK UPROX 4-PIN PROXIMITY SENSOR Bi6U-EM18H-AN6X?-H1141
 
WESTINGHOUSE RELAY MOTOR PROTECTOR CONTROL IQ-1000
 
ALLEN BRADLEY 600V 200A 3-POLE FUSEHOLDER SET X-410743 & X-402237
 
RELIANCE ELECTRIC 24VOLTS 1.90W FLIGHT II FAN ASSEMBLY 615196-SR *NEW NO BOX*
 
ELECTROMOTOREN 24VDC 5A ACTUATOR LINEAR DRIVE MAX30-A300515A2?510A-000 *CUT CABLE
 
GE 3POLE 60AMP 600 VAC FLEX-A-PLUG BROKEN PLUG COVER FVK362R
 
MEASUREX CP+ TRANSITION 05427000 REV A
 
ALLEN BRADLEY * TRANSFORMER TYPE M * X-343858
 
TURCK * SENSOR * BI2-G12-YO
 
SMC SOLENOID VALVE EVT307V
 
GE DIELEKTROL VII FLUID 2400V 3PH 60KV CAPACITOR 54L303WS60
 
ITT 120V 60HZ CLASS-A SOLENOID COIL, C225A02A18 *NEW*
 
ADVANCE 120V CORE AND COIL BALLAST REPLACEMENT KIT T1B061 *NEW*
 
SIC HEATING ELEMENT RC049 0052
 
ASHCROFT 0-100PSI INDUSTRIAL DURALIFE GAUGE 35-109-AW-2B-10?0
 
ALLEN BRADLEY AC RELAY 700-N200A1 SER. B
 
TDK 250VAC 20A NOISE FILTER ZAG2220-11S
 
BACO 12A 600VAC 2 POSITION MAINTAINED SWITCH PR12
 
FESTO MANIFOLD BLOCK PRS-ME-1/8-3
 
ALLEN BRADLEY CONTACT BLOCK 800T-XD2 SER D
 
HONEYWELL PRECISION LIMIT SWITCH 51ML2 8642
 
ALLEN BRADLEY PILOT LAMP KIT CLEAR LENS 125 VOLTS SER A NIB 1699-N71

    
ORIENTAL INDUCTION MOTOR 3IK15GN-AW W/ GEARHEAD 3GN5KA
 
ALLEN BRADLEY BLUE MUSHROOM PUSH BUTTON LOT OF 2 800T-D... SER T 99073
 
ALLEN BRADLEY * SIZE 2 TYPE 4 AC AUTOMATIC STARTER * 709-CCA SER. L
 
ADVANCE INSTANT START ELECTRONIC 120V 60HZ REL2P60S
 
GAST 115V, 1725RPM, 1-PHASE, 60CYCLE PISTON AIR COMPRESSOR 3LBA-10-M300X *NEW*
 
OHMITE 25 WATTS 10K OHMS VITREOUS ENAMELED RESISTORS, 0215 *NEW LOT OF 6*
 
TAPER SHANK HIGH SPEED STEEL BLACK OXIDE PTD 13/16 HSS
 
GENERAL ELECTRIC PURPOSE CONTACTOR 24V CR7RB
 
POWER TEAM ENERPAC HYDRAULIC HAND PUMP REPAIR KIT
 
BELL & HOWELL M-SERIES PRESSURE TRANSMITTER 4-373-0107
 
SPEED-RAIL LOT OF 2 31-18
 
MIDWEST ELECTRIC CURRENT TRANSFORMER 3CT13-B
 
VALBIA SR-085 SET05 PNEUMATIC ROTARY ACTUATOR
 
EATON CUTLER-HAMMER CSMS3F3CY1604 600 VOLT 13 AMP 3PIN 13FT CORDSET, NEW IN BAG
 
ALLEN BRADLEY DEVICENET 5 PIN MALE PATCHCORD 1485G-P5D5-N5 SER. B *NEW*
 
TURCK 4 PIN PROXIMITY SENSOR BI16-EM30H-AP6X?-H1141/S1589
 
ABB CIRCUIT BREAKER S 221 K10A LOT OF 2
 
PANAMETRICS 26DL PLUS UNTRASONIC THICKNESS GAUGE
 
HARTING TOP ENTRY METAL HOOD, *NEW SEALED*
 
PARKER 3/8"NPT, 110/120V, 10W, 50/60HZ SOLENOID VALVE 74332BN3RNJ1N0D?1D1P3 *NEW*
 
OMRON 24VDC SAFETY RELAY UNIT, G9S-301
 
SMC * FITTINGS LOT OF 10 * KQW07-34S
 
FERRAZ SHAWMUT 600V, 30A 3 POLE FUSEHOLDER USCC3 M217522
 
TURCK * 18 AWG, 4 CONNECTOR CABLE NIB * RKG 4.4T-5-RSG 4.4T/S600
 
ALLEN-BRADLEY GENERAL PURPOSE MOUNTING BRACKET ASSEMBLY 60-1479 *NEW*
 
DYNA-QUIP CONTROLS DM4 LOT OF 7 BRASS - 1/4" MPT
 
BRAD HARRISON * 4-PIN/F 22AWG MICRO-CHANGE CABLE NIB * 804000A09M020
 
ORIENTAL COMPUTER FAN * MD1208PTS3
 
Newly listedSQUARE D THERMAL-MAGNETI?C CIRCUIT BREAKER SERIES 2 KAL262251021
 
UFM TYPE 4 FLOW METER MM-NSF16GM-4-32?V1.0-M3WR-PC4M-?DC-C-Z86-8U
 
ALLEN PRODUCTS, INC AT 210-4 COMMUNICATION CIRCUIT ACCESSORY, LOT OF 43, NEW
 
FUJI ELECTRIC * CONTACT BLOCK * 2DI30Z-100
 
GOULD SHAWMUT 600V 3-POLE POWER DISTRIBUTION BLOCK 68083
 
HONEYWELL * PROXIMITY SWITCH * 923AA2HM-A7T-L
 
KEYENCE STATIC ELIMINATOR CONTROLLER POWER SUPPLY UNIT ONLY SJ-S020
 
ALLEN BRADLEY BULLETIN 700 SUPPRESSOR FILTER BAG OF 3 700-AV3R
 
VICTAULIC PIPE JOINING SYSTEM S'/163.3MM STYLE 920
 
MAH NEER STEEL CONDUIT LOCKNUTS100 IN BOX 3/4 " L-200 NIB
 
FUJI ELECTRIC BLACK PUSH BUTTON LOT OF 7 AR22F0R
 
BLACK SELECTOR SWITCH 99656
 
BEI 3/8" SHAFT DIA. ENCODER, H25D-SS-180-ABZ?-7406R-EM16
 
EMECANIQUE CLUSTER GREEN LIGHT SET NIB XVBKEQ37433G3
 
APPLETON 1 1/4" MALL IRON CONDUIT HUBS STRAIGHT HUB-125 NIB
 
ALLEN BRADLEY OVERLOAD RELAY 193-A4C1 SER A
 
NEER PLASTIC INSULATING CONDUIT BUSHING PB-500 1/1/2" LOT OF 20
 
UNKNOWN MFG * CABLE * E-18621-7
 
PARKER 60 SERIES BRASS COUPLER BH4-60
 
ALLEN BRADLEY 110/115-120V COIL SIZE 1 REVERSING STARTER 509-BOD SER. A

DONGAN 120X240V 150KVA 3R SINGLE PHASE TRANSFORMER 35-M015
 
ALLEN BRADLEY DISSCONNECT HANDEL 1494F-MI *NEW NO BOX*
 
DEVAR 4-1/2 DIGIT LOOP POWERED INDICATOR 18-LPI-4
 
SIEMENS CABLE A5E02161627
 
BANNER 20-250VAC PHOTOELECTRIC SENSOR S18RW3DLQ
 
ASHCROFT 0-250 DEGREES F -20-120 DEGREES C BIMETAL THERMOMETER 2F034 *NEW*
 
NUMATICS 150PSIG, 24VDC, 6.0W, 1/4"NPT SOLENOID VALVE 11SAD44AB
 
ORIENTAL MOTOR GEAR HEAD 4GN7.5K
 
MILLER SAFETY CLIMBING BELT LARGE 2NA
 
HONEYWELL 305965 30 PSI 1/8" NPT PRESSURE GAUGE, NIB
 
NUMATICS ACTUATOR 1A, 6-24VDC HALL EFFECT SENSOR AH6-002
 
CLE FORGE 1 21/64 HS DRILL BIT 205695
 
RUSSELLSTOLL 250V 50A ONE WAY EVERLOK RECEPTACLE ENCLOSURE 8331 *NEW*
 
BRAD HARRISON * 3 POLE FEMALE 22AWG CABLE NIB * 8030P1D01M050
 
MICRO SWITCH 10-28VDC PHOTOELECTRIC SWITCH, FE8B-TC6GR-M
 
ALLEN BRADLEY 120VAC 10A RELAY LOT OF 4 700-HA32A1-3-4 SER D
 
VEXTA 5-PHASE STEPPING MOTOR UPH599-B2
 
OM OREINTAL MOTOR INDUCTION MOTOR 5IK40GN-AUL
 
OKAYA 250VAC 5A NOISE FILTER SUP-P5H-EPR-4
 
COXREELS * 3/16" CABLE REEL WITH STAINLESS CABLE * SD-35-1
 
GKT 800 REPAIR FLAT GHN 421825-1
 
BALLUFF 35-250VAC 3 PIN PROXIMITY SWITCH BES 515-449-S21-L
 
TURCK 250V, 4A, 4 M OAL CABLE WK 4.2T-4 *NEW*
 
SQUARE D FLUSH HEAD PUSH BUTTON 9001 1SKR1R SER. K *NEW*
 
TURCK CABLE RSMCBC5 5711-4M
 
BANNER FIBER OPTIC CABLE IAT2.53S
 
FESTO FILTER CARTRIDGE LFMBP-1/2-H NIB
 
BANNER * FIBER OPTIC CABLE * IAT13S-17913
 
HONEYWELL 15-30oC, SATIN CHROME, THERMOSTAT COVER 14004406-110 *LOT OF 17, NEW*
 
RELIANCE ELECTRIC * MOTOR BRUSH NIB BOX OF 8 * 416956-4DF
 
BODINE * GEAR MOTOR * 48R6BFC1-F2
 
BANNER POWER BLOCK 2PBA
 
SIEMENS SUBRACK CR2 C-L6B01616
 
SANYO DENKI BRUSHLESS DC FINE ACE 20 109P0424H6D11
 
SHAWMUT AMPTRAP CLASS J 400AMPS FUSE A4J400
 
WESTINGHOUSE SERIES C MOLDED CASE SWITCH 480A 3 POLE 600VAC KD3400KW
 
DYNAMATIC 10HP P/S BOARD 15-871-5
 
PARKER 2.50" STROKE 3." BORE PNEUMATIC CYLINDER 02.50 BB2ANU14 3.00
 
CUTLER HAMMER 3A 600V CONTACTOR CE15AN3 B1
 
TURCK CABLE 9-PIN 4PR/24 NIB RJ45SFKSD841-2M
 
DATA TECHNOLOGY OPTECON ENCODER, ON35-1250-50/5
 
ALLEN BRADLEY 872C-D 3NN12-D4 SERIES C PROXIMITY SENSOR NNB
 
FUJI ELECTRIC 220VAC 5A 2 POLE CIRCUIT BREAKER, SA32B
 
ALLEN BRADLEY CIRCUIT BREAKER 1POLE 4 A LOT OF 7 1492-CB1 H400 SER C
 
SCHMERSAL 24VDC SAFETY RELAY SCR 1R
 
UNKNOWN MFG * SOLENOID COIL * 27-462-1
 
IMO ACTUATED SWITCH VALVE D1H-A150 NNB
 
1/8" BRASS SOCKET PLUG LOT OF 20