Bus Transceiver
Todays deals on Bus Transceiver?
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New TI Bus Transceivers PN# SN74LVTH18504APM $1,600.00 |
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240 PCS HD74LS245P 74LS245 DIP-20 Octal Bus Transceiver $159.39 |
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HIRSCHMANN 933989021 OPT FIBER GENIUS BUS TRANSCEIVER $100.00 |
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FOXBORO INVENSYS P0940KS-0C NODE BUS NODEBUS ETHERNET TRANSCEIVER $99.99 |
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100PCS 74LS243 DIP-14 74LS 243 DIP14 Quadruple Bus Transceiver $71.06 |
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AMD AM2917APC BUS TRANSCEIVER SINGLE 4-BIT NEW QTY-9 $45.00 |
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SN75ALS170J Triple Differential Bus Transceiver IC $44.35 |
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100pcs SN75176BP DIP-8 SN75176 DIP8 75176 TI BUS TRANSCEIVER IC $43.45 |
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50 PCS 74LS245 SOP-20 DM74LS245WM OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS $39.99 |
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10 ~ NSC # DS36954 IC TRANSCEIVER QUAD DIFFERENTIAL BUS 20-SOIC NATIONAL SEMI $29.75 |
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5962-8953202 QA BUS TRANSCEIVER (2 pcs) $24.99 |
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BOARD – CAN BUS Controller and Transceiver Dirver MCP2515 SN65HVD232D $19.00 |
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5962-8872701RA Mil Spec Octal Bus Transceiver 54ALS640 $19.00 |
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74LS623N 74LS623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUT IC 20-PIN DIP (Qty 2) $16.99 |
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ISO485P ISO485 P IC Isolated RS485 Diff Bus Transceiver $16.69 |
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5 TI Mil-Spec SN54LS245J Octal Bus Transceivers IC’s $12.99 |
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MOTOROLA DM54LS640J 54LS640 OCTAL BUS TRANSCEIVERS ( Qty 3 ) *** NEW *** $14.99 |
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74LS641-1N 74LS641N OCTAL BUS TRANSCEIVERS WITH 3-STATE OUT 20-PIN DIP (Qty 15) $14.99 |
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44 pcs TI # 74ACT11245DWR IC BUS TRANSCEIVER 8BT 24SOIC $18.70 |
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50 PCS SN74HC245N DIP-20 74HC245N 74HC245 HC245N Octal bus transceiver; 3-state $18.49 |
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BOARD – CAN BUS Transceiver Dirver SN65HVD232D $12.00 |
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SNJ54LS245J – 54LS245 OCTAL BUS TRANSCEIVER IC $12.88 |
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HARRIS CD74FCT7623M Octal Bus-Line Transceiver IC SMD $12.80 |
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8403001RA Mil Spec Bus Transceiver, SNJ54ALS245AJ $13.42 |
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5 PCS SN75160BN DIP-20 SN75160 INTERFACE BUS TRANSCEIVER $17.29 |
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74ALS640BN 74ALS640 OCTAL BUS TRANSCEIVERS WITH 3-ST OUT IC 20-PIN DIP (Qty 10) $12.99 |
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100 PHILIPS # 74HCT646D LOGIC BUS TRANSCEIVER OCTAL 24P $16.99 |
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74ALS646NT 74ALS646 OCTAL BUS TRANSCEIVERS AND REG IC 24-PIN DIP PKG (Qty 10) $12.99 |
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74LS646NT 74LS646 OCTAL BUS TRANSCEIVERS AND REGISTER IC 24-PIN DIP PKG (Qty 5) $12.99 |
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25pcs PERICOM # PI74FCT162501 IC BUS TRANSCEIVER 56SSOP $16.99 |
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74HC245 Bus Transceiver SMD 5 Pieces $3.89 |
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IDT74FCT861AP CMOS Bus Transceivers IC CHIPS ~ $13.66 |
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DS36954M – DS36954 Quad Differential Bus Transceiver IC $11.32 |
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5 PCS SN75161BN DIP20 SN75161 INTERFACE BUS TRANSCEIVER $14.99 |
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Bus Transceiver, SN74LS245N CHIPS ~ $11.87 |
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74ALS645A 74ALS645 OCTAL BUS TRANSCEIVERS WITH 3-ST OUT IC 20-PIN DIP (Qty 5) $9.99 |
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74ALS245N 74ALS245 OCTAL BUS TRANSCEIVERS IC 20-PIN DIP PACKAGE (Qty 20) *NEW* $9.99 |
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74ALS623AN 74ALS623 OCTAL BUS TRANSCEIVERS WITH 3-ST OUT IC 20-PIN DIP (Qty 5) $9.99 |
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74LS245DW 74LS245D OCTAL BUS TRANSCEIVERS 20-PIN SOIC SMT (Qty 15) U.S. SELLER $9.99 |
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74HCT245N 74HCT245 OCTAL BUS TRANSCEIVER IC 20-PIN DIP PACKAGE (Qty 20) *NEW* $9.99 |
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74LS640N 74LS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUT IC 20-PIN DIP (Qty 10) $9.99 |
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74LS652N 74LS652 OCTAL BUS TRANSCEIVERS AND REGISTER IC 24-PIN DIP PKG (Qty 10) $9.99 |
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LOT 3x 29FCT52BTP IDT IC,BUS TRANSCEIVER,SINGLE,8-BIT,FCT/PCT-CMOS,DIP $0.99 |
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CAN BUS TRANSCEIVER IC L9615 L9615D NEW $8.98 |
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Motorola MC6880AP Quad 3-State Bus Transceiver MC6880 NEW NOS $9.99 |
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Motorola ACT245 CPBT0018 OCTAL BUS TRANSCEIVERS $6.30 |
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DV74HCT244A AVG9512DDI Phillips Octal Bus Transceiver 3 $10.00 |
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DV74HCT374A AVG9512DDI Phillips Octal Bus Transceiver 3 $10.00 |
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10pcs SN74ALVCH16245 16-Bit Bus Transceiver/3-State Out $10.00 |
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100 ~ TI # SN74ABT162245DGGR SMT IC BUS TRANSCEIVER 16-BIT 48TSSOP 74ABT162245 $9.99 |
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50 ~ TI # SN74ABT623DW SMT IC BUS TRANSCEIVER DUAL 20 SOIC 74ABT623 $9.99 |
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50 ~ TI # SN74ABT863DW SMT IC BUS TRANSCEIVER 9-BIT 24-SOIC 74ABT863 $9.99 |
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74HCT652D OCTAL BUS TRANSCEIVER/REG 3-STATE IC 24-PIN SOIC SMT PACKAGE (Qty 5) $8.99 |
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1x LVCH16245A 16-BIT BUS TRANSCEIVER WITH 3 STATE OUTPUTS BRAND NEW! $9.99 |
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ICs,TEXAS INSTRUMENTS,P/N SN74LS245N, NON INVERTING BUS TRANSCEIVER DIP-20 $6.99 |
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74AC11245 OCTAL BUS TRANSCEIVER IC $8.77 |
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DS36F95J – DS36F95 Differential Bus Transceiver IC $8.66 |
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QUADRUPLE BUS TRANSCEIVERS IC SN75138 / SN75138N -2 PCS $7.60 |
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LTC1485IS8 [LTC1485] Differential Bus Transceiver IC $7.50 |
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10 PCS SN75161BN DIP-20 SN75161 INTERFACE BUS TRANSCEIVER $12.39 |
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ELCAP 74HC640 OCTAL BUS TRANSCEIVER (20 PCS) $8.00 |
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74LS245N 74LS245 OCTAL BUS TRANSCEIVERS (Qty 20) ***NEW*** $7.99 |
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MC3447 Bidirectional Instrumentation Bus Transceiver $7.95 |
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MC3448 Bidirectional Instrumentation Bus Transceiver $7.95 |
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MC3441 Quad General Purpose Interface Bus Transceiver $7.95 |
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MC3446 Quad General Purpose Interface Bus Transceiver $7.95 |
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MC10H680 4-Bit Differential ECL Bus/TTL Bus Transceiver $7.95 |
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SN75160BN TI 75160BN OCTAL BUS TRANSCEIVER 20-DIP $5.95 |
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OCTAL BUS TRANSCEIVER IC LVC4245A / SN74LVC4245A X 2PCS $6.80 |
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QUADRUPLE BUS TRANSCEIVERS IC SN75138 / SN75138D -2 PCS $6.60 |
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L9616D – L9616 HIGH SPEED CAN BUS TRANSCEIVER IC $7.50 |
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12 PCS HD74LS245P 74LS245 DIP-20 Octal Bus Transceiver $11.39 |
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HD74LS641P – HD74LS641 Octal Bus Transceiver IC $6.38 |
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SN74AVC8T245PW // SN74AVC8T245 8-BIT DUAL-SUPPLY BUS TRANSCEIVER IC $6.33 |
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SN74LVC16245ADGGRG4 [SN74LVC16245] BUS TRANSCEIVER IC $6.33 |
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SP5301CN – SP5301 Universal Serial Bus Transceiver IC $7.20 |
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SN74AS645N IC,BUS TRANSCEIVER,SINGLE,8-BI $5.61 |
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ELCAP 74HCT640 OCTAL BUS TRANSCEIVER (20 PCS) $8.00 |
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74LS243N 74LS243 QUADRUPLE BUS TRANSCEIVER 14-PIN DIP PACKAGE (Qty 25) $6.99 |
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74LS242N 74LS242 QUADRUPLE BUS TRANSCEIVER 14-PIN DIP PACKAGE (Qty 10) $6.99 |
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LOT 3x SN74HCT646NT TI Bus Transceivers Tri-State Octal Bus NEW IC $0.99 |
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LOT 3x 74FCT245ATP IDT BUS TRANSCEIVER,SINGLE,8-BIT,FCT/PCT-CMOS,DIP,20PIN NEW $0.99 |
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SN75160AN TI 75160AN OCTAL BUS TRANSCEIVER 20-DIP $4.95 |
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DS75160AN NSC SN75160AN OCTAL BUS TRANSCEIVER 20-DIP $4.95 |
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NS DS16F95J EIA-485/EIA-422A Differential Bus Transceiver DS16F95 $8.95 |
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2 PCS SN75160BN SN75160 DIP20 INTERFACE BUS TRANSCEIVER $10.89 |
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2 PCS SN75161BN SN75161 DIP20 INTERFACE BUS TRANSCEIVER $10.89 |
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10 75176B SN75176BDR sop8 Differential Bus Transceiver $10.80 |
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AM29864DC 9-Line Bus-Line Transceiver NOS AM29864 NEW $6.75 |
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2PCS SN75161BN SN75161 DIP-20 Interface Bus Transceiver $10.69 |
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SN74ALS645A-1N Logic Type:Bus Transceiver $4.50 |
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Lot of 32 IDT 74FCT646TQ 24-pin 8-bit Bus Transceiver $7.00 |
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SN54HCT245J Manu:TI Encapsulation:DIP,OCTAL BUS TRANSCEIVERS WITH 3-STATE $6.00 |
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LOT 2x 74FCT245ATP IDT BUS TRANSCEIVER,SINGLE,8-BIT,FCT/PCT-CMOS,DIP,20PIN NEW $9.99 |
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6 PCS SN75176BDR SN75176 75176B SOP-8 BUS TRANSCEIVER IC /FREE registered mail $9.99 |
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QUADRUPLE BUS TRANSCEIVER IC MC3446 / MC3446N ( NEW ) $4.99 |
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2 PCS TC74LVXC3245FS TSSOP-24 74LVXC3245 LVXC3245 Interface Bus Transceiver $9.99 |
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74HC245E High Speed CMOS Logic Octal-Bus Transceiver $4.09 |
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DS8834N / DS8834 / Bus Transceiver $4.25 |
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SN75176BP (X2 off) DIFF BUS TRANSCEIVER/LINEAR $4.09 |
Bus Transceiver Questions
Comparision of WAN Technologies
Comparison of WAN Technologies
Introduction:
The advances technologies such as ISDN, Frame Relay, ATM and SDH/SONET are being integrated for the data and voice traffic being transmitted over the internet. In olden days the telephone lines used carried voice traffic in the form of analog and were know as Plain Old Telephone System (POTS), but at present the telephones and the computers use digital technology for the voice and data traffic. Devices like modems are being used to convert analog into digital and vice versa. As more and more peoples are using internet the data and voice traffic is being transmitted over the same line. In my report I will focus on some of the modern technologies for voice and data traffic and the devices that are being used for the purpose in the Wide Area Network. At present the most emerging technology being used in the Wan is VOIP. It transmits voice over the internet using the packets. The users can transmit audio and video over a data network. The analog signal is converted into digital using the modem. The modem converts analog signals into small digital packets to be transmitted over the network. At the receiver end the data is demodulated and the file is converted into an AVG file. This procedure is being used in VOIP, Video conferencing and streaming of audio and video clips on the internet. With this the WAN technologies are emerging and many WAN devices are being used.
WIDE AREA NETWORKS:
Several Local Area Network connected is know as Wide Area Network. This helps in transmitting data to longer distances using a single network. Better example for this would be different branches of a company around the world are interconnected using the Wide Area Network. The branches use LAN in the branch and WAN between different branches which helps the business to grow at a faster pace and with security.
WAN DEVICES:
The various WAN devices available in the market are being manufactured on the lines of reliability and security of the network. Some of them are
Router:
In the network a router helps to connect one or more than one computers. Normally for home users they are helpful in taking a single broadband connection and spreading
Figure: Router
it to other computers. Backbone of an internet is usually by industrial routers which are used in the telecom industry. Each router has a table configured to make connections which lead to a group of IP addresses. The routing table also have the rules to handle different types of traffic.
Switch:
A switch is every so often called a ‘intelligent hub’, and at the present that they are no longer considerably more costly than the hubs they have roughly replaced them completely. A switch works alike as a hub, with the aim of to connect devices to let them to work as a single segment. However, it does not repeatedly transmit traffic to each and every port. Whenever a frame of data enters into the switch, it save the physical address (MAC address) and the port it come from in its MAC address table. Then it checks the target MAC address in the table, and if it recognises it sends the frame to the suitable port. If the address is not the table, or address is a broadcast address (intended for every machine on the local network), then it do the equivalent as a hub and transmits the frame throughout every port apart from the originating port.
Hub:
A hub is a tool for connecting various Ethernet devices (usually PCs) to outline a single segment – a part of a network that is unconnected from other parts of the network. It has several ports throughout which devices are joined, and while it receives data it send it out over through every port apart from the one it come in through. Initially Ethernet networks use coaxial cables. Each computer was fixed with a transceiver, which is connected straight into a long part of coaxial cable – a bus. This means that the traffic flowing on the network is visible to every one on the network.
Modem:
The short form for modulator and demodulator is Modem. It converts digital frequencies of the computer in to analog to make it transmit over the telephone or cable lines. At the receiver end the modem successfully demodulates the analog into digital and gives it to the computer to carry out appropriate functions.
Figure: Modem
WAN FACILITIES:
ISDN:
The replacement for old age analog technology is the ISDN. It was implemented to create a more reliable and faster transport mechanism. It is cheaper than a leased line and it takes seconds to install it. The standard ISDN, Broadband ISDN is the version most people are aware of which is the ATM.
The end equipment protocol is defined by the ITU I and the switch/network protocol is defined by the ITU Q series.
Structure of ISDN
The protocol model for ISDN is represented in the following diagram:
Figure: Structure of ISDN
SONET/SDH:
With the beginning of PCM tools in the 1960s, communications networks are steadily transformed to digital technology above the next few years (Werner, Fundamentals and SONET testing). To deal with the stipulate for ever high bit rates, a multiplex hierarchy called the plesiochronous digital hierarchy (PDH) evolve. The bit rates begin with the fundamental multiplex rate of 3 Mbit/s with additional stages of 8, 34 and 140 Mbit/s. The 1980s see a start in the growth of the synchronous digital hierarchy (SDH), with the purpose to eliminate the disadvantage inbuilt in PDH. SDH bring the subsequent advantages to network provider.
- High transmission rates
Transmission rates of up and about 10 Gbit/s can be achieve in current SDH systems.
- Simplified add and drop function
When compared to the old PDH system, it is a lot easier to take out and insert low-bit rate channels on or after or into the high-speed bit streams in SDH.
- Reliability
Modern SDH networks consist of various repeated back-up and repair mechanism to deal with system faults.
- Future platform for advanced services.
At present, SDH is the suitable platform for the advanced services ranging from ISDN, POTS through to data communications (LAN, WAN).
- Interconnectivity
SDH makes it easy to install or set up new gateways in between various network providers and SONET systems.
Figure: SDH Layer Model
Difference between SDH and SONET:
SDH is the synchronous digital hierarchy that is use every where apart from in the USA, Canada and Japan. SONET (Synchronous optical network) is the American counterpart of SDH. Designs of this transmission technology in America begin as far back as 1985. The SONET basic bit rate is 51.48 Mbit/s and is named STS-1 (synchronous transport signal). If the bit rate is transmit above an optical cable system, the signal is named as OC-1 (optical container)
SONET Signal
Bit Rates
SDH Signals
STS-1
51.84 Mbit/s
STM-0
STS-3
155.52 Mbit/s
STM-1
STS-12
622.08 Mbit/s
STM-4
STS-48
2488.32 Mbit/s
STM-16
STS-192
9953.28 Mbit/s
STM-64
Table: Levels in Hierarchy
Public Data Network:
The people around the world use public network to send and receive data which is also know as internet. If a user is making a call using the internet then its priority will be high because the user is using an expensive technology. If its security and reliability is ignored then more and more private networks will be formed by different companies which will lead to congestion of the network The common carrier subscriptions which own telecom services are known as public networks. It supports the transmission of voice traffic over the internet using the modems through the telephone sockets and gain automated access to users around the world. In this there is no wastage of bandwidth as the calls are being made over the internet and this will be a reliable and suitable for small companies
ATM:
ATM is the short form for Asynchronous Transfer Mode. Circuit switching usually requires that packets are placed into position in recurring frames, i.e. synchronous, in time, in step according to use and/or network clocks. Asynchronous transmission allow cells to be placed anywhere in the data stream. ATM at present has speeds of 155Mbps (OC-3 ports), 622Mbps (OC-12 ports), 1.2 Gbps and 2.5 Gbps. Since the cells are rigid in length (53 octets, or bytes) quite than variable such as an Ethernet frame, they can be switch in hardware to a certain extent than software and these accounts for the high speeds that can be attain than Ethernet, Token Ring and FDDI.
ATM is very lithe and allow the transmission of a variety of media type such as voice, video, data files etc. all demanding the network in changed ways, video, for example can be extremely subject to a sudden slowdown in network routine as altering speed video is very disturbing. ATM allows committed circuits with certain bandwidths and differing needs to be set up at the same time (http://www.rhyshaden.com/atm.htm). Quality of Service (QoS) can be locate up and is certain at connection stage by means of parameter such as delay, delay jitter and error rate base on the function and the position of the network at the moment of connection. Two priority for traffic are defined; High priority and Low priority. Low priority traffic force is leftover if around are switch congestion trouble. Particularly voice and video traffics include to be transferred by means of previous methods such as MPLS over ATM and IP over ATM, where QoS maintain advantages of the ATM are subjugated in exacting (Cemal Kocak, et.al, 2007). There is no joint media or conflict based protocols in ATM, each machine has 155Mbps all to itself. In ATM you be able to multiplex ‘cell streams’ so as to may be for totally different application, the structure works in ‘connection oriented’ form thereby guarantee cell sequencing for those cells in a exacting connection.
Frame Relay:
It is developed by the values or technology base on ISDN (Piliouras, 2005). The communication is among end users by following the interface of public network and private network (Taylor, 2000). It handles high traffic on internet at high speeds and on the whole handles data networking issue at high speed by functioning on following principles:
Solution for errors like congestion occurs, discarding frames and means to improve errors at end user method. It works on applications of data and is based on packet switching (Smith, 1996). The data is distributed into frames of variable length similar as in packet switching, which is sent to target through frame relay networks. The difference between frame relay and packet switching is that frame relay is second layer protocol of OSI where as packet switching is third layer protocol but frame relay is quite straightforward compared to packet switching linking locations all the way through access circuit to networks (Green, 2000). Carrier information rate (CIR) is the element which is used to charge and it guarantees the transporting the carrier through, Access Circuit cost is classify by LEC and port speed which is a manifold of 64 Kbps.
CONCLUSIONS:
The idea of information backdrop, issue concerning technology, in force scenarios and advance to protocols management for WAN technologies and a lot of unresolved promotion and technological questions concerning coexist of conventional communications of voice. The WAN technology should further develop earlier than the considerable possible acceptance and also customer service and billing methods. Additional determine execution of WAN and efficient structure of billing method for calls using VOIP system and also sophisticated procedures. Advancement or adoption of WAN technologies will in the end resolve services, price efficiency and Quality of Service. The trouble for session timeout, issue of reliability and solution of feeble slow link have to be resolve. The mixing of data protection system is necessary for errors correction and dependable to run the arbitrary data or voice traffic over the internet internet.
References:
Cathrine Paquet, 2001, “Building Cisco Remote Access Networks” Cisco Press CompTia, Que Publishing.
Cemal Kocak, et.al, MPLS over ATM and IP over ATM methods for multimedia applications, Computer Standards & Interfaces 31 (2009), pp 153–160, 2007.
Dennis & Fitzgerald, 2005, “Business Data Communications Networking“, John Wiley & Sons.
Gupta C P, 2006, “Data Communications and Computer Networks“, India, Prentice Hall of India.
Huggins D, Ferguson B, 2002, “Designing a Windows Server 2003 Active Directory and Network Infrastructure“, Que Publishing.
http://www.rhyshaden.com/atm.htm, Accessed 5th May 2009.
About the Author
Completed my Master’s in Telecommunication from University of Sunderland, UK. Having zeal to get in depth of the field and share my knowledge with my fellow beings.
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