Serial Ports
Serial Ports
History of USB Port Explained, USB Port simplifed
USB Port Explanation
Everyone that has used a PC or laptop will have used this ports without themselves knowing.
The history of the USB port goes back to the period of 1990s where several connection interface exist such as serial port, parallel port, ps2, etc. With so many interfaces, a typical user will need different cables for each separate connection.
USB(Universal Serial Bus) was created to standardize all the different interfaces, hence the word “universal”
With the standardization of different interface, the USB port has more tasks to complete – to increase their transfer rate between the host and devices connected to it.
USB started off on specification USB1.0 in 1994, followed by USB1.1, and finally USB2.0 in 2000
The various transfer speed of the specification is as follows
USB1.0 – 1.5Mbit/s
USB1.1 – 12Mbit/s
USB2.0 – 480Mbit/s
As of writing, USB3.0 Specification was in the midst of discussion and the transfer speed is rumored to be at 5000Mbit/s!!
The increase in transfer speed was mainly meant for transferring of data between devices. As USB hard disk expands in capacity, and users are demanding for better video quality, naturally, video file sizes are increased. Thus the birth of USB3.0
The first commercial product released for USB flash drives, commonly known as thumbdrive, in 2000. Back then, flash storage was at a measly 128mb. At time of writing, 2009, 1.5TB (1,500GB or 1,500,000MB) already exists!
If we were to transfer a single file of 5Gb on usb1.1 specs, on theory, we will need 3333s, which will take around 55min!! and 83s on a USB2.0 Specs.
Over the years, different companies develop different interface for USB devices as well, which somehow defeats the purpose of standardizing a common interface. However, the problem of different interface was not as serious as it was back in 1990s.
USB cable was able to carry power and to power up devices such as thumbdrive, webcams, external hard disk, usb speakers, etc. However, power is capped at 5v, 100mA.
USB cables suffer from a “useful” distance. Meaning, the maximum length of a usb cable is capped at 5m. Should the length be longer, the efficiency dropped and data may be corrupted.
For PCs with limited USB ports, a hub, typically with 4 additional USB ports, may be purchased. This will indirectly increase 3 more USB ports on your computer. However, take note that the bandwidth and power of each port on the USB hub will be reduced, as all its bandwidth and power are sourced from a USB port.
Common problems faced from using a USB hub, slower transfer rate and the inability to power up external 2.5” hard disk as they require more power as compared to a usb webcam or usb speaker.
That is all to wrap up for the topic and history for USB. I hope that the above computer guide will assist you in having a further understanding of USB history.
For more information about computers, do visit S-Mall Computer Article Section.
If you are purchasing computers in Singapore, do drop by our website http://www.s-mall.com.sg
PR:
wait...
I:
wait...
L:
wait...
LD:
wait...
I:
wait...
Rank:
wait...
C:
wait...
About the Author
Nick Lee is a consultant for a computer website at http://www.s-mall.com.sg and has assisted many on their technical issues.
|
|
Syba 1-Port DB-9 Serial(RS-232) PCI-express Controller Card SD-PEX15021 $17.59 |
|
|
Add 2 Serial (DB9, RS232) ports to PC w/ PCI Slot, low profile bracket included $11.99 |
|
|
Add 2 Serial & 1 Parallel ports to PC with PCI slot, fan Out cable RS232 Printer $15.99 |
|
|
Digi Ports/ 16EM DB25 16 port Serial Server $145.00 |
|
|
add a Serial (RS232 COM1 DB9) port to PC for invoice printer, scanner, PCIe Card $19.99 |
|
|
SIIG LP-P400H3-S6 LOW PROFILE 4-PORT SERIAL CARD PCI-BUS $9.99 |
|
|
* NEW SIIG PCI ADAPTER W/ TWO SERIAL & ONE PARALLEL PORT 2S1P JJ-P21111-S4 $19.95 |
|
|
NEW SIIG JJ-E10011-S3 CyberSerial 1-port PCI Express Serial Adapter $53.41 |
|
|
SYBA SK-LP-MCS2S PCI Low Profile 2-Port Serial DB-9 Card For Windows XP/Vista $18.89 |
|
|
Syba SD-LP-MCS1S LP 1Port Serial DB9 PCI Card Retail Low Profile Work Windows 7 $13.69 |
|
|
StarTech PCI8S950LP 8 Port Low Profile RS232 PCI Serial Card with 16950 UART $151.81 |
|
|
StarTech MPEX4S552 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART $97.49 |
|
|
Lava S Serial-PCI High Speed Com Port 16550 UART 9-Pin Plug&Play FreeFastShip NR $8.99 |
|
|
DB9 PCI to COM 9-pin Serial Port RS232 Expansion Controller Card Adapter C $4.75 |
|
|
PCIe 2 Port Ports 9-Pin Serial RS232 PCI-E Express Card - Fast Ship $19.99 |
|
|
SYBA SY-PCI15031 PCI to 2x DB-9 Serial (RS-232) Ports Controller Card [OEM] $12.39 |
|
|
I/O Crest SY-PCI15031 2-Port Serial PCI Controller Card $11.39 |
|
|
PCI Dual Serial Port I/O Cards (10 in the lot) $80.00 |
|
|
Adaptec AAR-1210SA Serial SATA RAID Controller 2 Ports $24.99 |
|
|
NEW StarTech.com 4 Port PCI Serial Adapter Card $44.10 |
|
|
Digi Classic Board 4 Port ISA Serial I/O Card & Cable RS-422 1P-50000622-01 $49.99 |
|
|
Best Connectivity SD-PEX15022 PCI-Express RS232 2x Serial Port MSC9901 Chipset $9.99 |
|
|
Digi 77000857 NEO PCI-X Universal 4-Port Multiport Serial Adapter $135.99 |
|
|
DB9 RS232 Serial DB25 Parallel Port Printer PCI PC Card $9.85 |
|
|
STARTECH PCI2S550 - .COM 2 PORT SERIAL PCI I/O CARD ADA $44.59 |
|
|
STARTECH PCI1S550 - .COM 1 PORT SERIAL PCI I/O CARD ADA $32.29 |
|
|
STARTECH ISA2S550 - .COM 2 PORT ISA SERIAL CARD ADAPTER $28.29 |
|
|
STARTECH PCI2S1P - .COM 2 SERIAL 1 PARALLEL PORT PCI CO $42.39 |
|
|
4-Port RS232 Serial PCI JJ-P04511-S1 $59.99 |
|
|
NEW PCI I/O Expansion 2 Serial Port RS232 Card UK $10.93 |
|
|
SIIG CyberSerial Dual Serial Port PCI IO Card JJ-P02012 Fast 16550 16 Byte Buffe $1.00 |
|
|
NEW PCI RS232 SERIAL DB9 4PORT COM CARD WORK WINDOWS 7 32/64BIT $28.00 |
|
|
5 Pcs DB9 9 Pin Serial Port Female COM Connector Socket $3.15 |
|
|
2 Pcs DB9 9P RS232 Serial Port Female Socket + Plastic $3.25 |
|
|
New Quatech USB to Serial Cable Adapter P/N SS-USB-100 Single RS-232 Port $24.28 |
|
|
Item image StarTech 2 Port Serial PCI Card PCI2S550 $12.60 |
|
|
Lava D-Serial-PCI 2 Port Adapter - 2 x 9-pin DB-9 RS-232 Serial $12.60 |
|
|
New in Box B&B Electonics 3PCISD1A PCI to Serial Port Computer Card $107.50 |
|
|
DUAL PORT SERIAL CARD - PCI EXPRESS $31.33 |
|
|
B&B Electronics 422ICC ISA 1-Port RS-422/485 Serial Card w/16850 $106.76 |
|
|
Adaptec Dell AAR-2610SA/64MB Serial SATA RAID Controller Card 6 Ports $39.99 |
|
|
NEW SIIG 1-port PCI Express Serial Adapter - 1 x 9-pin $31.24 |
|
|
STARTECH PCI2S1P - .COM 2 SERIAL 1 PARALLEL PORT PCI CO $42.09 |
|
|
STARTECH PCI2S550 - .COM 2 PORT SERIAL PCI I/O CARD ADA $41.79 |
|
|
STARTECH PCI2S1P - .COM 2 SERIAL 1 PARALLEL PORT PCI CO $42.09 |
|
|
STARTECH ISA2S550 - .COM 2 PORT ISA SERIAL CARD ADAPTER $39.99 |
|
|
STARTECH PCI2S550 - .COM 2 PORT SERIAL PCI I/O CARD ADA $41.79 |
|
|
STARTECH PCI1S550 - .COM 1 PORT SERIAL PCI I/O CARD ADA $48.59 |
|
|
STARTECH ISA2S550 - .COM 2 PORT ISA SERIAL CARD ADAPTER $39.99 |
|
|
STARTECH PCI1S550 - .COM 1 PORT SERIAL PCI I/O CARD ADA $48.69 |
|
|
STARTECH PCI2S1P - .COM 2 SERIAL 1 PARALLEL PORT PCI CO $42.09 |
|
|
STARTECH PCI2S550 - .COM 2 PORT SERIAL PCI I/O CARD ADA $41.79 |
|
|
STARTECH ISA2S550 - .COM 2 PORT ISA SERIAL CARD ADAPTER $39.99 |
|
|
STARTECH PCI1S550 - .COM 1 PORT SERIAL PCI I/O CARD ADA $48.69 |
|
|
SYBA SY-PCI15031 PCI to 2x DB-9 Serial (RS-232) Ports Controller Card [OEM] $12.39 |
|
|
Add 6 (six) Serial (COM, DB9) ports to any Desktop PC with PCI slot, 2 brackets $24.99 |
|
|
HP Pavilion 7966 Front Panel Port Assy 5065-6098 USB FireWire/USB/Serial Ports $1.99 |
|
|
SYBA SY-PCI15031 PCI to 2x DB-9 Serial (RS-232) Ports Controller Card [OEM] $12.26 |
|
|
HP COMPAQ NC8430 9-PIN SERIAL PORT BOARD 6050A2031701 $14.95 |
|
|
445775-001 HP 2-Port Powered Serial Card $50.00 |
|
|
STARTECH.COM - TWO 16C550 SERIAL ONE EPP PARALLEL PORT PCI COMBO CARD $14.99 |
|
|
HP Pavilion 743N 5002-8742 XT846 USB/Serial Ports $19.99 |
|
|
NEW PCI Express Serial ATA II (SATA II) Card, 2x External Port (e-SATA), SiI3132 $17.99 |
|
|
SIIG LP-P20011-S6 2-port serial adapter w/fan out cable $38.01 |
|
|
SIIG LP-P20011-S6 2-port serial adapter w/fan out cable $38.01 |
|
|
SIIG LP-P20011-S6 2-port serial adapter w/fan out cable $38.01 |
|
|
STARTECH.COM PEX2S950 2-port serial pci express adapter $49.60 |
|
|
SIIG JJ-P02012-S6 2-port pci serial rs232 adapter $50.26 |
|
|
SIIG JJ-P02012-S6 2-port pci serial rs232 adapter $63.25 |
|
|
STARTECH.COM PEX2S950 2 Port PCI-E Serial Card $62.40 |
|
|
STARTECH.COM PEX2S950 2-port serial pci express adapter $62.59 |
|
|
SIIG JJ-P02012-S6 2-port pci serial rs232 adapter $50.26 |
|
|
STARTECH.COM PEX2S950 2-port serial pci express adapter $49.60 |
|
|
STARTECH.COM PEX2S950 2-port serial pci express adapter $49.60 |
|
|
SIIG JJ-P02012-S6 2-port pci serial rs232 adapter $50.26 |
|
|
StarTech PCI1S950DV 1-Port PCI RS232 Serial PCI $26.71 |
|
|
B&B ELECTRONICS 3PCISD2A PCI DUAL SERIAL PORT CONTROLLER PCI CARD $39.99 |
|
|
HP COMPAQ NX8220 NC8230 NW8240 USB, AUDIO JACK, SERIAL PORT, MODEM PARTS LOT $7.49 |
|
|
3 Port SATA Serial ATA+IDE PCI PC Host Controller Card $5.99 |
|
|
New Serial Port RS 232 PCI Bracket Adapter (Lot x 2) $9.99 |
|
|
3 Port SATA Serial ATA+IDE PCI I/O Controller PC Card $7.78 |
|
|
MANHATTAN 2-ports PCI RS232C 16C550/16C450 158213 Serial Adapter 158213 $23.39 |
|
|
HP 2-Port Powered Serial Card (KH887AA) For rp5700 $28.34 |
|
|
IC INTRACOM MANHATTAN 2PORT PCI EXPRESS SERIAL ADAPTER - 158169 $37.87 |
|
|
BL-CS6 PCI to Expansion 6-Port Serial Card Adapter MC9865 Add More Serial Device $16.99 |
|
|
KEC 222N PCI 2x 9-Pin Serial Desktop Com Port Video Graphics Card $3.99 |
|
|
SIIG (JJ-E20011-S3) CyberSerial Dual PCI-E - serial adapter - 2 ports $59.99 |
|
|
4 port Serial PCI-4S Card/Low Profile/SIIG, #LP-P400A3 $29.95 |
|
|
54MM Express Card to 2 Ports ESATA SATA Serial Adapter $10.99 |
|
|
Panasonic Toughbook CF-19 SERIAL Port Cover BRAND NEW $12.75 |
|
|
Cisco WIC-2T Cisco 2 Port Serial WAN Interface Card $35.00 |
|
|
NEW DELL Half Height PCI-e 9 Pin Serial Port Low Profile Card D39K1 $10.00 |
|
|
Innosys Inc DBA Keyspan USB Twin Serial Adapter w/ 2 Ports $83.00 |
|
|
2x Wireless Serial RS232 Port Module Smart Car TTL 300M $11.99 |
|
|
StarTech.com 1 Port FTDI USB to Serial RS232 Adapter Cable with COM R ICUSB2321F $26.99 |
|
|
SYBA SY-PCI15031 PCI to 2x DB-9 Serial (RS-232) Ports Controller Card [OEM] $12.39 |
|
|
Add a Serial (DB9 COM RS232) port to PC, PCI Card: mouse, modem & label printer $9.99 |
|
|
Digi AccelePort Xe 4-port Multiport Serial Adapter $99.99 |
|
|
Addonics ADS3GX4R5-E 4-Port PCI-X Raid 5 Serial ATA Controller Card $29.99 |
|
|
IBM SSA 4-Port PCI Advance Serial RAID 34L5388 (055) $36.00 |
|
|
Aerosoles Women's Serial Port Black Boots $54.99 Brand & Style - Aerosoles Serial Port; Width - Medium (B, M); True Color - Black; Upper Material - Synthetic; Outsole Material - Man-Made ; Heel Height - 3.25 Inches |
|
|
SYBA PCI to 1-port DB-9 Serial Port Controller Card $8.49 This is an SYBA PCI to 1-port DB-9 serial port (RS-232) controller card. Upgrade and expand your system's connectivity with this card. |
|
|
SYBA SD-LP-MCS1S Low-profile PCI Single DB9 Serial Port Card $11.35 This is a SYBA low-profile PCI single DB-9 serial port card. Expand your computer's connectivity with this card. |
|
|
SYBA 34-mm ExpressCard to 2x RS232 Serial Port $29.99 This is a SYBA 34-mm ExpressCard to 2x RS232 serial port. Expand your computer's connectivity with this 2x Serial port 34-mm ExpressCard. |
|
|
SYBA PCI to 1-port DB-9 Serial Port Controller Card (SY-PCI15003) $11.49 This is an OEM SYBA PCI to 1-port DB-9 serial port (RS-232) controller card. Upgrade and expand your system's connectivity with this card. |
|
|
SYBA PCI-e to 4x DB-9 Serial Port Controller Card $34.49 This is a SYBA PCI-e to 4x DB-9 serial port controller card. Expand your computer's connectivity with this 4-port serial PCI-e controller card. |
|
|
BasAcc SYBA SD-LP-MCS1S Low-profile PCI Single DB9 Serial Port Card $12.49 This is a SYBA OEM low-profile PCI single DB-9 serial port card. Expand your computer's connectivity with this card. |
|
|
Eforcity Syba SY-PCI15004 2-Port RS-232 Serial PCI Controller Card $10.49 Controller card provides enhanced 2 serial port to your PCI equipped computerIdeal for all serial port devices for improved connectionsData transfer speed of up to 1 Mbytes/sec |
|
|
SYBA PCI-e to 4x DB-9 Serial Controller card with Fan-out Cable $35.49 This is a SYBA PCI-e to 4x DB-9 serial controller card with fan-out cable. Expand your computers connectivity with this PCI-e to 4x serial port controller card. |
|
|
SYBA PCI-e 4-Port Serial DB-9 Card SD-PEX50030/ Chipset MCS9901 $25.49 This is a SYBA PCI-e 4-port serial DB-9 card. Increase your computer's connectivity by adding this 2-serial port/ 1-printer port to your computer. |
Thanks for visiting!