Unveiled
in 1995, the Universal Serial Bus connectivity standard allows up
to 127devices may be connected to the Host PC without using multiple
connector types, without interrupt conflicts (IRQs), without hardware
address adjustments (jumpers) or channel changes(DMA). The
USB interface is standard on virtually all of the new PC's from Compaq,
Dell, Gateway, Hewlett Packard, IBM and most others. USB will be
replacing many common PC connectors such as Centronics parallel,
RS-232 serial, Mini-DIN and Sub-D (game ports, printer ports, keyboard
and mouse connectors, modem and most network adapters, etc.) ...
eventually replacing most external connections except main power
(plug-in-the-wall), specialty high speed video and very high speed
networks.
    
One industry standard connection set for virtually all peripherals
and accessories.
 Series
A Plug and Series B Plug
The series A connector, intended for upstream connections
(towards the Host PC) is available in standard, upright and vertical
designs save board space. Four wires with shield; two data lines
and 5 volts DC with ground and shield.
The series B connector, for downstream connections towards
USB peripherals such as USB hubs and USB keyboards, telephones and
modems, monitors, printers and scanners and many other peripherals.
Its the same four wires with shield; two data lines and 5 volts DC
with ground and shield.
Broad
IndustrySupport:
The standards have been established by the computer and telecommunications
leaders including Altec-Lansing, Cherry
Electric, Cypress Semiconductor, IBM, Intel
Corporation, Kodak
Digital, Micrel Semiconductor,
Microsoft, NteChip, Newnex,
Northern Telecom, Philips
Semiconductor, Siemens, Texas Instruments and USAR Systems, through the USB
Standards Organization. Joining in support and development, Apple, Compaq,
Dell, Fujitsu, Gateway,
Hewlett Packard, NEC,
Sony, Toshiba, Transmonde and many others.
It is expected that by the end of this year, most PC, WorkStation
and PowerPC parts and products manufacturers will join the effort
and offer USB compatible products. .... and USBStuff.
Flexibility:
All kinds of devices can be hooked to the USB equipped PC through
the same connector type, simultaneously ... cameras, modems, printers,
scanners, mice, joysticks, keyboards, sound cards and sound systems,
telephony devices, network connections, robotic devices, wireless
interconnectivity and more, either by daisy chaining and/or through
a tiered / star, multi-drop topology utilizing hubs. These devices
have their own unique firmware "address" on any USB system. Operating
system software will be able to identify each device through the
USB protocol as each device comes on line or goes off line.
Specifications Overview
:
Dual data transfer rates; - 1.5 Mbps and 12 Mbps; supports up to
127 devices; both isochronous and asynchronous data transfers; up
to 5 meters per cable segment length; built in power distribution
for low power devices. Daisy chain or stacked tier device topology.
Portions
of the above definitions and images are copyright 1998 by the Newnex
Corporation. Note : all trademarks, service marks and copyrights
in this catalog are attributed herein to the various owners of such
throughout this catalog and are hereby used with implied and expressed
permission in the best interest of all concerned. It is not the intention
of USBStuff or its employees and/or contractors to degrade or disparage
any trademark, service mark or copyright.
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