OBEX .

• OBEX

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Bluetooth protocols - Object exchange (OBEX)

1 Object exchange (OBEX; also termed IrOBEX) is a communications protocol

that facilitates the exchange of binary objects between devices. It is

maintained by the Infrared Data Association but has also been

adopted by the Bluetooth Special Interest Group and the SyncML wing of the Open Mobile Alliance (OMA).


Bluetooth protocols - Object exchange (OBEX)

1 In Bluetooth, OBEX is used for many profiles that require simple data exchange (e.g., object push, file

transfer, basic imaging, basic printing, phonebook access, etc.).


OBEX

1 This PDA and its many successors use OBEX to exchange business cards, data, even

applications.


OBEX

1 Although OBEX was initially designed for infrared, it has now been adopted by Bluetooth, and is also used over RS-232, USB, Wireless Application

Protocol|WAP, and in devices such as Livescribe smartpens.


OBEX - Comparison to HTTP

1 OBEX is similar in design and function to HTTP in providing the client with a reliable transport for

connecting to a server and may then request or provide objects. But OBEX differs in many important respects:



1 *HTTP is normally layered above a TCP/IP link. OBEX is commonly implemented on an IrLAP/IrLMP/Tiny TP stack on an IrDA device.

In Bluetooth, OBEX is implemented on a Baseband/Bluetooth_protocols#ACL_.28Asyn

chronous_Connection_Less.29_link|ACL/Bluetooth_protocols#L2CAP_.28Logical_Link_Control_and_Adaptation_Protocol.29|L2CAP/

Bluetooth_protocols#RFCOMM_.28Radio_Frequency_Communication.29|RFCOMM stack. Other such bindings of OBEX are possible.



1 *HTTP uses human-readable text, but OBEX uses binary-formatted type-

length-value triplets named Headers to exchange information about a

request or an object. These are much easier to parse by resource-limited

devices.



1 *HTTP transactions are inherently stateless; generally a HTTP client opens a connection,

makes a single request, receives its response, and either closes the connection or HTTP persistent connection|makes other

unrelated requests. In OBEX, a single transport connection may bear many related

operations. In fact, recent additions to the OBEX specification allow an abruptly closed

transaction to be resumed with all state information intact.


OBEX - Profiles

1 OBEX is the foundation for many higher-layer

profiles:


Host Controller Interface (Bluetooth) - Object exchange (OBEX)

1 Object exchange (OBEX; also termed IrOBEX) is a communications protocol

that facilitates the exchange of binary objects between devices. It is

maintained by the Infrared Data Association but has also been

adopted by the Bluetooth Special Interest Group and the SyncML wing of the Open Mobile Alliance (OMA).


GlobeXplorer

1 'GlobeXplorer' (Now part of DigitalGlobe Inc. (NYSE:DGI)) was an

online spatial data company that compiled and distributed aerial photos, satellite

imagery, and map data from their online spatial archives. Based in Walnut Creek,

CA, GlobeXplorer has been credited as the first company to establish a business

around compiling and distributing online aerial and satellite imagery.


GlobeXplorer - Products

1 GlobeXplorer’s primary products were the ImageAtlas viewer and

ImageBuilder web developer toolkit. They also provide ImageConnect

extensions and web services for GIS and CAD.


GlobeXplorer - History

1 In 2005, GlobeXplorer acquired AirPhotoUSA, one of the nation’s leading providers of aerial

imagery


GlobeXplorer - History

1 GlobeXplorer's defensible core competence was its ability to meter

custom profiles of content for consumers and pay royalties to

providers based on 512x512 standard image units (SIU). This was

accomplished through content hosting, delivery via APIs and

application plugins, and


GlobeXplorer - Prominent Customers

1 In addition to its own website, GlobeXplorer's imagery and property

data was licensed to Ask.com, Zillow.com, National Geographic (magazine)|National Geographic,

Reply.com, and the Germany-based Map24.com, as well as inside various professional real estate services like

CoStar, eNeighborhoods, and Rappatoni MLS. It also provided

Mapquest with imagery in 2001 and 2002.


GlobeXplorer - Partner Relationships

1 GlobeXplorer obtains its content through online distribution

relationships with about 30 of the world’s top acquirers of aerial, satellite, and property data.


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