(66MHz), 2X (133MHz), or 4X (266MHz). PCI - Peripheral Component Interconnect - a high speed interface for video cards, sound cards, network interface cards, and modems; runs at 33MHz. ISA - Industry Standard Architecture - a relatively low speed interface primarily used for sound cards and modems; runs at approx. 8MHz. RAM - Random Access Memory - see System RAM Port (serial, parallel, PS/2, USB, sound, LAN, VGA, SCSI) - interface connectors for the associated types of devices Serial - a low speed interface typically used for mice and external modems Parallel - a low speed interface typically used for printers PS/2 - a low speed interface used for mice and keyboards USB - Universal Serial Bus - a medium speed interface typically used for mice, keyboards, scanners, display panels (control features, not data), speakers (control features, not sound), scanners, and some digital cameras.
3. Devices 4. Physical appearance 5. Comparisons History Developed in the mid-1990s Designed to standardize the connection of computer peripherals Compaq, DEC, IBM, Intel, Microsoft, NEC and Nortel. USB 1.0 USB 2.0 USB 3.0 USB1.0 USB 1.0: Released in January 1996 USB 1.1: Released in August 1998 1.5 Mbit/s - "Low Speed" 12 Mbit/s - "Full Speed" USB 2.0 Released in April 2000 Higher maximum bandwidth of 480 Mbit/s (60 MB/s) Other modifications Mini connectors On-the-go Battery charging Micro usb USB 3.0 transfer speed more bandwidth power management improved bus utilization System design Asymmetrical in its topology Hubs Sub devices Pipes (stream, message) First connect c l ass e s De v i c e Various US B devices regular USB flash-drive regular USB hub Regular USB fan regular USB refrigerator regular USB toaster regular USB vacuum cleaner regular USB aquarium regular USB keyboard
Joonis1.1 Lõiketangid. Joonis1.0 Kabbel. Joonis1.2 RJ-45 pistik. Joonis 1.3 7 Kasutatud materjal 1. http://www.cabletiesandmore.com/american/catalog/images/network_products/cable- tester.jpg 2. http://www.connectworld.net/connectors/568A-568B.gif 3. http://www.arvutid24.ee/images/e6/orig/e6eec5a5a4d203c0977f03a93f0f11b5.jpg 4. http://img.en.china.cn/0/0,0,283,662,360,360,fee9c762.jpg 5. http://csgtechnology.com/portal/components/com_virtuemart/shop_image/product/Co nector_RJ45_48d67b211eb12.jpg 8
kaetud ferrooksiidlakiga. Pilt 3 (lisa) Kontroller ( Actuator ): Liigutab lugemis- ja kirjutamispead. Kontroller liigutab pead terve ketta raadiuses ning juhib pea sinna, kust on vaja andmeid lugeda või kirjutada. Kuigi lugemis- ja kirjutamispäid on mitu, on kontrollerit ainult üks. Mootor: Paneb pöörlema alumiiniumkettad. Sellest osast eraldub kõige suurem osa kõvaketta eraldatavast soojusest. Liidesed: ( Connectors): Mille külge on võimalik panna nii toite- kui ka andmejuhe. Kõvaketaste ühendamiseks on mitmeid liideseid, neist tuntumad on MFM, PATA (IDE), SCSI, FC , SATA, SAS, FireWire ja USB ning RJ-45. Kõvaketta liidestest lk 8 5 Haapsalu Kutsehariduskeskus Peeter Zolotov
ing. Not turning off the power supply may result in malfunction or electric shock. • Mounting or dismounting I/O Units, CPU Units, or any other Units. • Assembling the Units. • Connecting or wiring the cables. • Connecting or disconnecting the connectors. ! Caution Failure to abide by the following precautions could lead to faulty operation of the PC or the system, or could damage the PC or PC Units. Always heed these pre- cautions. • Fail-safe measures must be taken by the customer to ensure safety in the event of incorrect, missing, or abnormal signals caused by broken signal lines,
- Lost channel capacity PIM levelid: Specified in absolute power level (dBm) – -110dBm IM signal caused by two +43dBm tones Or relative to only one of the test tones (dBc) – The same specified as -153dBc IM level. – Units of dBc are relative to the largest of the incident carriers Kuidas vähendada? Passive components at least -155dBc at 2x 20W (43dBm) For terminations use cable absorbers Use 7/16 type connectors Connectors tightened with correct torque, no more no less Low PIM jumper cables with soldered connectors Use all connectors and tools from the same manufacture No mechanical stress on RF parts All RF interconnections cleaned as specified by the manufacturer 66.Mis põhjustab passiivset ristmodulatsiooni (PIM – Passive Intermodulation) Põjustajad: Poor mechanical junction in the RF path; RF components with materials which exhibit some level of hysteresis (eg
Juhib pead vastavalt sinna, kust on vaja andmeid lugeda või kirjutada. Kontroller liigutab pead terve ketta raadiuses. Kuigi lugemis- ja kirjutamispäid on mitu, siis kontrollerit on ainult üks. ·Mootor. Mootor paneb pöörlema alumiinimum kettad. Sellest osast eraldub kõige suurem osa kõvaketa eraldatavast soojusest. 4 ·Liidesed (ingl. k. Connectors). Liidesed kuhu on võimalik külge panna juhtmed. Vastavalt siis toite ja andme juhe. ·Korpus. Mõeldud kõvaketta kaitsmiseks ja kooshoidmiseks. Samuti aitab see säilitada kõvaketta sisest rõhku. Tänapäeval leiavad kõvakettad kasutust paljudes kohtades: muusikakeskustes, pleierites, lauaarvutites, personaalarvutites, mängukonsoolides, telekates ja ka mõningates kaasaskantavates seadmetes. Kaasaskantavates seadmetes pole HDD ehk standartne kõvaketas väga levinud kuna
3. IT Description 3.1.Hardware Environment The hardware environment of Lee IS is comprised of following components: Server Laptops (Dell x6) (two privately owned ones) Work stations (one privately owned by an employee) Telephone (Philips) Network devices: a router and a switch Portable hard drives Computer mice, keyboards (Logitech, Defender, Microsoft) Displays Dock connectors (Dell x3) 3.2.Software Environment As the primary technology the company is using is ASP.NET and as it is a part of Microsoft Partner Program the majority of software originates from Microsoft: Microsoft Visual Studio 2012 Microsoft Windows XP/7, Microsoft Windows server 2012/2008 R2 Internet Information Services 7.5 Microsoft SQL Server 2008 R2 Microsoft .NET Framework 4 Microsoft Visual SourceSafe(VSS) Microsoft Office 2010
after ten or more collisions, choose K from {0,1,2,3,4,...,1023}· after 16 collisions, give up and tell layer sends to B minimum frame size(64 B). Industrial connectors and cables CAT5E above "I give up"· "fixes" random access stability problem by passing it to the layer above! oCollision domain - the set of networked devices whose framescan collide with · Even a frame with a valid FCS is considered runt, if it's <64B High speed redundancy Collision detection time, abort time Need to distinguish collision from noise, since no need for one another
city. Two most important landmarks in Tartu are Emajõe Ärikeskus (Emajõe Business centre) and Tigutorn (Snail Tower). These are most easily spotted in the city and these are also the buildings that most characterize Tartu. Four more visual elements besides landmarks were studied in Tartu. These were edges, districts, nodes and paths. All the elements are interacted with each other, forming an entity. Nodes are important as connectors between districts. Main nodes in the area under survey were: Anne roundabout (Est. Anne ring), Turu crossroads (Est. Turu ring) and Town Hall Square (Est. Raekoja plats). Those nodes connect the districts in the area under survey: Centre of the City (Est. Kesklinn), Ülejõe, Karlova and Annelinn. Districts in the area are rather well distinguishable, though the Centre of the City could be divided into two districts: old Centre of the City and new
A Fuel trap C Spark sustain valve C Ported vacuum switch (blue) H Dual diaphragm distributor B Ported vacuum switch D Ported vacuum switch (green) J Inlet manifold connection E T-connectors Under part throttle cruising conditions, engine warm-up, some models may suffer from distributor vacuum advance is required to allow a lack of throttle response. To overcome this 2 Inlet manifold - removal and time for the fuel/air mixture in the cylinders to problem a spark sustain valve may be fitted in refitting burn. When returning to a part throttle opening the vacuum line either individually or in
board and the microprocessor circuit. If the sensor circuit draws any signifi- cant current, there will be a DC offset between the microprocessor board and the sensor circuit. This will cause an offset to the thermistor signal, affecting the temperature measurement. Figure 8.3 shows the same circuit, but with resistances in all the lines. These resistors represent the sum of the wire resistance and contact resistance in the connectors. Say that the total resistance in the ground wire is 1 ohm. If the sensor circuit draws 50 ma, then the drop across the ground wire is 50 ma ¥ 1 ohm, or 50 mv. The result of this is that the thermistor signal, which is 250 mv at the sensor board, becomes 300 mv at the microprocessor board—an error of 5°C. If the sensor circuit also controls an output, such as a heater that shares the same ground, then the thermistor signal will jump every time the heater is on. This
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