西門(mén)子S7-1500 PLC通信模塊6GK7542-6UX00-0XE0
西門(mén)子S7-1500 PLC通信模塊6GK7542-6UX00-0XE0
西門(mén)子S7-1500 PLC通信模塊6GK7542-6UX00-0XE0
交換是按照通信兩端傳輸信息的需要，用人工或設(shè)備自動(dòng)完成的方法，把要傳輸?shù)男畔⑺偷椒弦蟮南鄳?yīng)路由上的技術(shù)的統(tǒng)稱(chēng)。交換機(jī)根據(jù)工作位置的不同，可以分為廣域網(wǎng)交換機(jī)和局域網(wǎng)交換機(jī)。廣域的交換機(jī)就是一種在通信系統(tǒng)中完成信息交換功能的設(shè)備，它應(yīng)用在數(shù)據(jù)鏈路層。交換機(jī)有多個(gè)端口，每個(gè)端口都具有橋接功能，可以連接一個(gè)局域網(wǎng)或一臺(tái)高性能服務(wù)器或工作站。實(shí)際上，交換機(jī)有時(shí)被稱(chēng)為多端口網(wǎng)橋。
網(wǎng)絡(luò)交換機(jī)，是一個(gè)擴(kuò)大網(wǎng)絡(luò)的器材，能為子網(wǎng)絡(luò)中提供更多的連接端口，以便連接更多的計(jì)算機(jī)。隨著通信業(yè)的發(fā)展以及國(guó)民經(jīng)濟(jì)信息化的推進(jìn)，網(wǎng)絡(luò)交換機(jī)市場(chǎng)呈穩(wěn)步上升態(tài)勢(shì)。它具有性?xún)r(jià)比高、高度靈活、相對(duì)簡(jiǎn)單和易于實(shí)現(xiàn)等特點(diǎn)。以太網(wǎng)技術(shù)已成為當(dāng)今最重要的一種局域網(wǎng)組網(wǎng)技術(shù)，網(wǎng)絡(luò)交換機(jī)也就成為了最普及的交換機(jī)。
Switch是交換機(jī)的英文名稱(chēng)，這個(gè)產(chǎn)品是由原集線器的升級(jí)換代而來(lái)，在外觀上看和集線器沒(méi)有很大區(qū)別。由于通信兩端需要傳輸信息，而通過(guò)設(shè)備或者人工來(lái)把要傳輸?shù)男畔⑺偷椒弦髽?biāo)準(zhǔn)的對(duì)應(yīng)的路由器上的方式，這個(gè)技術(shù)就是交換機(jī)技術(shù)。從廣義上來(lái)分析，在通信系統(tǒng)里對(duì)于信息交換功能實(shí)現(xiàn)的設(shè)備，就是交換機(jī)。
Hanna Instruments HI7639829/10 pH/EC/DO/Temp/Turb probe for HI9829
Hanna Instruments HI769828/100 Spare Temp. probe for HI9828 w/100m Cbl
Hanna Instruments HI769828/60 Spare DO/EC/C probe for HI9828 w/60m
Hanna Instruments HI769828/70 Spare DO/EC/C probe for HI9828 w/70m
Hanna Instruments HI769828/80 Spare DO/EC/C probe for HI9828 w/80m
Hanna Instruments HI769828/90 Spare DO/EC/C probe for HI9828 w/90m
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HANSA MOTOREN FCM 225M-47HE MOTOR
Hanse Environmental TC-1
HANSEN GEAR REDUCER 83B 11-1, SHELF WORN RATED 125 HP AT 1750 RPM
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Hardy HI 1756-2WS Series B Dual Weigh Scale Mod - with 30 Warrantee
Hardy HI 1756-2WS Series B Dual Weigh Scale Mod - EXLNT with 30 Warrantee
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Harmonic Drive and Electric Motor - Intromitter Drive A
HARMONIC DRIVE HTL8000-1L-AS-DC USPP HTL80001LASDC
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HARRIS 10307-1610-01 SPLITTER ASSEMBLY RF CONNECTOR BOARD NSN 5895-01-464-4365
HARRIS CORPORATION 101-115540-001 USPP 101115540001
HARRIS CORPORATION 12045-4001-102 NSFP 120454001102
HARRIS CORPORATION 193-115038-013 USPP 193115038013
HARRIS CORPORATION 193-115039-013 USPP 193115039013
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Harris Flexstar exciter
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HART FIELDBUS 375 FIELD COMMUNICATOR WITH CASE, MANUAL, LEADS
Hart Scientific 7012
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HARTFORD 411BLFNBRMFBJ63 USPP 411BLFNBRMFBJ63
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HARTMAN FIELD OVERVOLTAGE RELAY A-927AA NSN: 5945-00-719-4092 COIL 28V
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HA-SH152CK Mitsubishi 3.5KW Servo Motor HASH152CK HA-SH152
HA-SH352CK Mitsubishi 3.5KW Servo Motor HASH352CK HA-SH352
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Hauser Parker HLE 100 Linear Drive w/Servo 62" Travel w/Emerson DXM-455C & Neuga
Have the est N8972-60101 input module. Calibrated.
HAYSSEN 1078-7A-0002 I/O PC BOARD PART NO 1078 7A 0002
HAYSSEN 1078-7F-0054
HAYWARD DA10600FTP3 NSFP DA10600FTP3
HAYWARD EVT30KC2E24A NSFP EVT30KC2E24A
Hazardous Location Switch Gear. Stainless steel flameproof three phase plug EXD
HBC RADIOMATIC INC FSE-735 USPP FSE735
HBS DC Power Supply L25060X, Variable Powerstart Transformer,Semiconductor,lab
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HCN50924 SQUARE D PANELBOARD INTERIOR I-LINE 400A MLO 400A 600V 3P CIRCUIT (d)
HC-SFS152 Mitsubishi Servo Motor 200V 1500W 1.5KW 7.16Nm
HC-SFS202 Mitsubishi Servo Motor 200V 2000W 2.0KW 9.55Nm
HC-SFS502 Mitsubishi Servo Motor 200V 5000W 5.0KW 23.9Nm
HC-SFS702 Mitsubishi Servo Motor 200V 7000W 7.0KW 33.4Nm
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HD VideoScope with 5.8mm Semi-Rigid Probe a€“ Extech HDV610
HD VideoScope with 5.8mm Semi-Rigid Probe a€“ Extech HDV620
HD-1033/UA Integral Stirling Cryogenic Cyrocooler Thermal Camera Infrared FLIR
HD-3WXL CONTINUOUS DUTY HARD DRIVE DEGAUSSER- MACHINE WITH CASE
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HDMI OC-030M Fiber Optic Cables
HDR 2099108 USPP 2099108
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HDS02.1-W040N-HS12-01-FW INDRAMAT CONTROLLERS REMANUFACTURED
HDS02.2-W040N INDRAMAT PLC MODULES REMANUFACTURED
HDS02.2-W040N-HS12 INDRAMAT DRIVES REMANUFACTURED
HDS03.2-W075N INDRAMAT DRIVES REMANUFACTURED
HDS03.2-W075N-HS12-01-FW INDRAMAT DRIVES REMANUFACTURED
HDS03.2-W075N-HS32-01-FW INDRAMAT DRIVES REMANUFACTURED
HDS03.2-W075N-HS45-01-FW INDRAMAT DRIVES REMANUFACTURED
HDS03.2-W100N-HS12-01-F INDRAMAT DRIVES REMANUFACTURED
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HDSIOC ROLLER B NOVELLUS 02-308058-00 VERSION 4.72
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HE697BEM600 Horner Electric GE Fanuc PLC I/O Controller
HEADER, 1.27MM, H:1.75MM, SMT, 50WAY, 15 11 050 2601000 2066957
HEADER, 1.27MM, H:1.75MM, SMT, 68WAY, 15 11 068 2601000 2066958
HEADER, 1.27MM, H:1.75MM, SMT, 80WAY, 15 11 080 2601000 2066959
HEADER, 1.27MM, H:3.25MM, SMT, 26WAY, 15 12 026 2601000 2066961
HEADER, 1.27MM, H:3.25MM, SMT, 50WAY, 15 12 050 2601000 2066962
HEADER, 1.27MM, H:3.25MM, SMT, 68WAY, 15 12 068 2601000 2066963
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Headers & Wire Housings 40P OPEN END PLUG 4640-6300 (50)
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HEATSHRINK, 2:1, 76.2MM, 60M, TF21 76,2/38,1 BK 2070907
