prof. dr. m. h. assal a.s. 2/4/2014. the interfaces for attaching external devices to a computer or...
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A.S. 2/4/2014
5. Data Ports
Prof. Dr. M. H. Assal
Introduction to Computer
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Data Ports The interfaces for attaching external devices to a
computer or The doors through which information enters and
leaves a computer system. and leaves a computer system.o PS/2 ports (Mouse, Keyboard)o Serial ports (Mouse, modems, printers) 150 kbpso Parallel ports (printers, scanners, external data drives) 1.2
mbpso SCSI ports – Small Computer Systems Interface
(many internal and external devices) up to 320 mbpso USB ports - Universal Serial Bus
(nearly everything) 1.5 - 12 - 480 - 4000 mbpso Firewire Connections (imaging devices – digital
camcorders, scanners) 100-800 mbps
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Data Ports
PS/2 Ports Serial Port
Parallel Port
USB
SCSI
Firewire Ports
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Data Port Features Fast Reliable Flexible Inexpensive Power-conserving Supported by the operating system
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Parallel Port Commonly known as the printer port 25 pin D-Type connector It has 12 digital output pins, 5 digital input pins Pins operate at the TTL voltage level i.e. 0 – 5V Port identified by a base address in the computer
I/O memory space
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Serial Port 9 pin D-Type connector Pins operate at -25 to +25 voltage levels Data transmitted as a bit sequence Known as the EIA RS232C port or simply
RS232 Maximum date rate of 19,600 bps
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Serial Port vs. Parallel Port
Serial cables can be much longer than Parallel cables
Serial suited for wireless transmission
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Universal Serial Bus Universal Serial Bus (USB) was designed in mid-
1990s to standardize the connection of computer peripherals to computers.
It has become commonplace on other devices (such as smartphones, PDAs and video game consoles).
USB has effectively replaced a variety of earlier interfaces, such as serial and parallel ports.
USB is a likely solution any time you want to use a computer to communicate with devices outside the computer
Device, male connector Computer, female connector Hub
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Universal Serial Bus
Interface # of De-vices
(maximum)
Length(max feet)
Speed(max. bps)
Typical Use
USB 127 16 (or up to96 ft. with 5
hubs)
Ver. 1.0 1.5 M (nearly everything)Mouse,
Keyboard, Hard Drives, Mass Stor-
age, Network Adapters, Audio, Camcorders
Ver. 1.1 12 M
Ver. 2.0 480 M
Ver. 3.0 5 G
RS-232 2 50-100 20 K (115K with
somehardware)
Modems, MouseBar-Code ReadersInstrumentation
Parallel (Printer) Port
2 10–308 M
PrintersScanners
IEEE-1394 (FireWire)
64 15 IEEE-1394a
400 M
Digital Video (Cam-corders)
Old iPod & iPhoneMass StorageIEEE-
1394b 3.2 G
Comparison
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Universal Serial Bus USB Features
Flexible Ease of use was a major design goal for USB, and the result is an interface that’s a pleasure to use for many reasons: Windows automatically detects the peripheral and loads the appropriate software driver.There’s no need to locate and run a setup program or restart the system before using the peripheral.
One interface for many devices. USB is versatile enough to be usable with many kinds of peripherals. Instead of having a different connector type and supporting hardware for each peripheral, one interface serves many.
SpeedUSB supports three bus speeds: high speed data transfer.
ReliabilityThe reliability of USB results from both the hardware design and the data-transfer protocols.
Low Cost
Low Power Consumption
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Universal Serial BusIt’s Not Perfect
Lack of Support for Legacy HardwareOlder (“legacy”) computers and peripherals don’t have USB ports. If you want to connect a non-USB peripheral to a USB port, a solution is a converter that translates between USB and the older interface .
Distance LimitsUSB was designed as a desktop bus, with the expectation that peripherals would be relatively close at hand. A cable segment can be as long as 5 meters. You can increase the length of a USB link to as much as 30 meters by using cables that link five hubs and a device, using 6 cable segments of 5 meters each.
Peer to Peer CommunicationsUSB can’t talk to each other directly. All communications are to or from the host computer. Other interfaces, such as IEEE-1394, allow direct peripheral- to-peripheral communications.
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Universal Serial Bus
USB 2.0 A big step in USB’s evolution was version 2.0.
Support for much faster transfers.
a 40-times increase was found to be feasible, for a bus speed of 480 Megabits per second.
USB 2.0 is backwards compatible with USB 1.1.
Version 2.0 peripherals can use the same connectors and cables as 1.x peripherals.
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Universal Serial BusUSB 3.0
Released in November 2008 Also referred to as SuperSpeed USB Speeds 10x faster than 2.0 (5 Gbps in controlled test
environment) Extensible – Designed to scale > 25Gbps Optimized power efficiency Backward compatible with USB 2.0
o USB 2.0 device will work with USB 3.0 hosto USB 3.0 device will work with USB 2.0 host
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Universal Serial Bus
Added pins for SuperSpeed USB signals.
Compatibility for USB 2.0 connectors.
Different shapes of connectors are provided to support the compatibility with current (USB 1 & 2) devices.
USB 3.0 Connectors
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USB vs. Firewire (IEEE-1394)
USB Firewire
Multiple devices support
Single host can communicate with many peripherals/devices
127 64
Peer to Peer No Peer-to-Peer support
Support Peer-to-Peer model, where peripherals can communicate with each other directly
Cost Relatively Cheap Expensive
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THANK YOU