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USB (Universal Serial Bus) Tutorial

What is USB?
Universal Serial Bus is a high speed connectivity standard enabling simple plug and play connections to devices such as printers, digital cameras, camcorders, keyboards and mice. The standard is supported by many leading suppliers of computers and peripherals. An attractive advantage of USB is that the devices are hot pluggable meaning a live connection/disconnection without data loss or interruption. Currently there are two relevant revisions of USB, 2.0 and 3.0. USB 3.0 is an emerging standard that allows large amounts of data or video to be transferred up to 10 times faster than USB 2.0. However, USB 2.0 is still much more common in the marketplace and is expected to remain relevant for applications that do not require large amounts of data to be moved. It is important to note that in order to take advantage of the increased bandwidth USB 3.0 provides all components must be 3.0 compliant – host, cables and peripherals. Otherwise the bandwidth will perform to the lowest rated component.

Applications for USB
Initially USB products were used mainly to link computers and their associated peripherals. Today USB is used in nearly every market including communications, entertainment, medical and automotive.

USB Connectors
The USB specification requires a host system to be equipped with an A type jack. The B/mini B type jack is typically found on peripheral devices requiring detachable cables. Therefore, detachable USB cables are configured as an A to B/mini B male combination which prevents improper bus configurations and topology miswiring.
For a complete listing of USB Connectors, see the Connector Chart at L-com.com/ConnectorChart

USB connectors

USB Cable Construction

USB Cable Construction

L-com’s CSMUAA, CSMUAB, CSMUAX and CSUZAB cable series use 20 AWG power conductors.
All CSMUAMB (Mini B) cable series use 28 AWG power conductors.
ECUSB series uses 26 AWG power conductors, WPUSB series uses 24 AWG power conductors.

USB Topology
USB is a serial, bi-directional bus that can be layered in tiers or star shaped with the use of a hub. USB does not require terminators or manual addressing.

USB Tier Topology

USB Tier Topology

USB Star Topology

USB Star Topology

Technical Data: USB Limitations

USB Revision
Max. Transmission Rate
Max. Cable Length
3.0
4.8 Gbps
5 meters
2.0
480 Mbps
5 meters
1.1
12 Mbps
5 meters

Selecting the right USB cable assembly for your application

L-com takes pride in having a large variety of USB cables. The following selection guide is intended to assist you in selecting the right cable for your need.
Cable SeriesConnector TypesPhotoColorPower Lead
Wire AWG
Distinguishing Characteristics
CSMUABMale Type A - Male Type BLight Gray20Superior electrical performance compared to industry standard cables - 20 AWG power leads provide maximum current/power transfer.
CSMUAAMale Type A - Male Type ALight Gray20Superior electrical performance compared to industry standard cables - 20 AWG power leads provide maximum current/power transfer.
ECUSBABMale Type A - Male Type BGray26Industry standard USB cable suitable in most applications and comparable to competitors cables.
CSMUAXMale Type A - Female Type ALight Gray20Extension cable. Superior electrical performance compared to industry standard cables - 20 AWG power leads provide maximum current/power transfer.
CSUZABMale Type A - Male Type BBlack20Low Smoke Zero Halogen (LSZH) jacket and backshell material significantly reduce the amount of toxic and corrosive gases emitted during combustion. 20 AWG power leads provide maximum current/power transfer.
CSMUAMB4Male Type A - Male Mini-Type B 4 PositionBlack28Typically used with digital cameras, MP3 players and other small portable devices.
CSMUAMB5Male Type A - Male Mini-Type B 5 PositionBlack28Most common mini USB connector. Used with digital cameras, MP3 players, cell phones and other small portable devices as well as some GPS units.
ECF504-XXAASFemale Type A Panel Mount - Male Type ALight Gray20Efficiently allows USB cables to be passed through a panel or enclosure. Utilizes metalized plastic housing. 20 AWG power leads provide maximum current/power transfer.
ECF504-5MFemale Type A Panel Mount - Cut EndLight Gray20Efficiently allows USB cables to be passed through a panel or enclosure. Utilizes metalized plastic housing. Cut end allows user to configure their own assembly or hard wire. 20 AWG power leads provide maximum current/power transfer.
UPMAAFemale Type A Panel Mount - Male Type ALight Gray20Efficiently allows USB cables to be passed through a panel or enclosure. Utilizes molded PVC housing. 20 AWG power leads provide maximum current/power transfer.
UPMA5Female Type A Panel Mount - 5 Pin Female Header ConnectorGray26Efficiently allows USB cables to be passed through a panel or enclosure. Utilizes molded PVC housing. 5 pin connector mates to standard 0.100" centerline headers.
CSMUAXMT-2MFemale Type A Mounting - Male Type ALight Gray20Extends USB computer port for easy mounting via screws or double sided foam tape. 20 AWG power leads provide maximum current/power transfer.
COILUABLatching Male Type A - Male Type BBlack28Latching A connector provides secure connection. Retractable polyurethane cord provides longer life and saves space when compared to standard cables.
WPUSBABWaterproof Male Type A - Male Type BBlack24Waterproof A male mates with waterproof A female connectors to protect against dust, moisture and temporary immersion under water. IP67 rated.
WPUSBAXWaterproof Female Type A - Male Type ABlack24Waterproof A female is panel mountable. When mated with waterproof A male or capped with WPUSB-CVR, provides protection against dust, moisture, and temporary immersion under water. IP67 rated.
WPUSBBAWaterproof Female Type B - Male Type ABlack24Waterproof B female is panel mountable. When mated with waterproof B male or capped with WPUSB-CVR, provides protection against dust, moisture, and temporary immersion under water. IP67 rated.
WPUSBBBWaterproof Male Type B - Male Type BBlack24Waterproof B male mates with waterproof B female connectors to protect against dust, moisture and temporary immersion under water. IP67 rated.
WPUSBAFWaterproof Female Type A - Wire LeadsVarious24Waterproof A female is panel mountable. When mated with waterproof A male or capped with WPUSB-CVR, provides protection against dust, moisture and temporary immersion under water. IP67 rated. Wire leads allow user to configure their own assembly or hard wire.
WPUSBBF

Waterproof Female Type B - Wire Leads

Various24Waterproof B female is panel mountable. When mated with waterproof B male or capped with WPUSB-CVR, provides protection against dust, moisture and temporary immersion under water. IP67 rated. Wire leads allow user to configure their own assembly or hard wire.
CAU3AAMale Type A - Male Type ABlue24High speed USB 3.0 cables used for data storage/backup and applications where large volumes of data require fast transfer. Includes HD movie and other multimedia applications.
CAU3ABMale Type A - male Type BBlue24Used to connect high speed USB 3.0 host to peripheral devices such as media players, data storage devices and other USB 3.0 systems.
CAU3AMICBMale Type A - Male Micro BBlue24

Used to connect high speed USB 3.0 devices including mobile devices such as cell phones, GPS units, PDAs and digital cameras. Used for high speed voice, video, and data downloads of up to 4.8 Gbps.

CAU3AXMale Type A - Female Type ABlue24

Used to extend high speed USB 3.0 Type A cables. Can be used with host or peripheral devices such as a USB 3.0 hub.

ECF504-30Male Type A - Female Type ABlue24

Used in ECF panel mount applications where a USB Type A male to female extension connection is required. Can be used in enclosure and panel mount designs.

 
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