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InformaCast
InformaCast is a proprietary Voice over IP network protocol for live audio paging. The protocol allows endpoints (such as public address speakers) to autonomously announce their presence and capabilities (such as recording or GPIO) and configure themselves to play audio broadcasts. InformaCast was originally developed by Berbee and later spun off into a separate company as Singlewire Software. The protocol is built largely on standard technologies including SLP for locating a configuration server, TFTP for obtaining configuration data, HTTP and XML for registering devices and transmitting commands, and multicast RTP for audio playback and recording. Further reading Public Safety Summer Updates(Daily Gazette, Swarthmore College Swarthmore College ( , ) is a private liberal arts college in Swarthmore, Pennsylvania. Founded in 1864, with its first classes held in 1869, Swarthmore is one of the earliest coeducational colleges in the United States. It was established as ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Singlewire Software
Singlewire Software, LLC develops and supports ip-based voice applications for emergency communication with mass notification capabilities. The company is located in Madison, Wisconsin in the United States of America. History The Berbee Software IP Telephony engineering and sales team was originally formed under Berbee Information Networks Corporation in 1998. The mission of the group was to create software applications to enhance the capabilities of Voice Over IP networks which were rapidly being deployed in organizations. InformaCast, the group's flagship application, was developed as mass notification system for a federal government client in response to the September 11 terrorist attacks. Berbee was acquired by CDW Corporation on October 11, 2006. In April 2009, the group formed a company, Singlewire Software, which repurchased the assets it had developed. while all other portions of the former Berbee Information Networks Corporation remain with CDW and form the heart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berbee
CDW Corporation, headquartered in Lincolnshire, Illinois, is a provider of technology products and services for business, government and education. The company has a secondary division known as ''CDW-G'', devoted solely to United States governmental entities, such as K-12 schools, universities, non-profit healthcare organizations, State & Local and the Federal government. History CDW was originally incorporated in 1984 as "MPK Computing" by its founder Michael Krasny. The idea was born when Krasny took a small ad in a free-circulation newspaper to sell his computer and printer. It later became Computer Discount Warehouse and then simply CDW. In early 2006, CDW opened a distribution center in North Las Vegas, Nevada. The Vernon Hills, Illinois distribution center is roughly . In October 2006 CDW acquired Berbee, a top tier reseller of IBM, Cisco, and Microsoft products and services. It was CDW's second major acquisition after purchasing Micro Warehouse in September 2003. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voice Over IP
Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS). Overview The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding. Instead of being transmitted over a circuit-switched network, the digital information is packetized and transmission occurs as IP packets over a packet-switched network. They transport media streams using special media delivery proto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Address
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution. Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GPIO
A general-purpose input/output (GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit (e.g. MCUs/ MPUs ) board which may be used as an input or output, or both, and is controllable by software. GPIOs have no predefined purpose and are unused by default. If used, the purpose and behavior of a GPIO is defined and implemented by the designer of higher assembly-level circuitry: the circuit board designer in the case of integrated circuit GPIOs, or system integrator in the case of board-level GPIOs. Integrated circuit GPIOs Integrated circuit (IC) GPIOs are implemented in a variety of ways. Some ICs provide GPIOs as a primary function whereas others include GPIOs as a convenient "accessory" to some other primary function. Examples of the former include the Intel 8255, which interfaces 24 GPIOs to a parallel communication bus, and various GPIO ''expander'' ICs, which interface GPIOs to serial communication buses such as I²C and SMBus. An exam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Service Location Protocol
The Service Location Protocol (SLP, srvloc) is a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration. SLP has been designed to scale from small, unmanaged networks to large enterprise networks. It has been defined in RFC 2608 and RFC 3224 as standards track document. Overview SLP is used by devices to announce ''services'' on a local network. Each service must have a URL that is used to locate the service. Additionally it may have an unlimited number of name/value pairs, called ''attributes''. Each device must always be in one or more ''scopes''. Scopes are simple strings and are used to group services, comparable to the ''network neighborhood'' in other systems. A device cannot see services that are in different scopes. The URL of a printer could look like: service:printer:lpr://myprinter/myqueue This URL describes a queue called "myqueue" on a printer with the host name "myprinter". The protoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TFTP
Trivial File Transfer Protocol (TFTP) is a simple lockstep File Transfer Protocol which allows a client to get a file from or put a file onto a remote host. One of its primary uses is in the early stages of nodes booting from a local area network. TFTP has been used for this application because it is very simple to implement. TFTP was first standardized in 1981 and the current specification for the protocol can be found in . Overview Due to its simple design, TFTP can be easily implemented by code with a small memory footprint. It is therefore the protocol of choice for the initial stages of any network booting strategy like BOOTP, PXE, BSDP, etc., when targeting from highly resourced computers to very low resourced Single-board computers (SBC) and System on a Chip (SoC). It is also used to transfer firmware images and configuration files to network appliances like routers, firewalls, IP phones, etc. Today, TFTP is virtually unused for Internet transfers. TFTP's design w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HTTP
The Hypertext Transfer Protocol (HTTP) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web, where hypertext documents include hyperlinks to other resources that the user can easily access, for example by a mouse click or by tapping the screen in a web browser. Development of HTTP was initiated by Tim Berners-Lee at CERN in 1989 and summarized in a simple document describing the behavior of a client and a server using the first HTTP protocol version that was named 0.9. That first version of HTTP protocol soon evolved into a more elaborated version that was the first draft toward a far future version 1.0. Development of early HTTP Requests for Comments (RFCs) started a few years later and it was a coordinated effort by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), with work later moving t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multicast
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with physical layer point-to-multipoint communication. Group communication may either be application layer multicast or network-assisted multicast, where the latter makes it possible for the source to efficiently send to the group in a single transmission. Copies are automatically created in other network elements, such as routers, switches and cellular network base stations, but only to network segments that currently contain members of the group. Network assisted multicast may be implemented at the data link layer using one-to-many addressing and switching such as Ethernet multicast addressing, Asynchronous Transfer Mode (ATM), point-to-multipoint virtual circuits (P2MP) or InfiniBand multicast. Network-assisted multicast may also b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Real-time Transport Protocol
The Real-time Transport Protocol (RTP) is a network protocol for delivering audio and video over IP networks. RTP is used in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications including WebRTC, television services and web-based push-to-talk features. RTP typically runs over User Datagram Protocol (UDP). RTP is used in conjunction with the RTP Control Protocol (RTCP). While RTP carries the media streams (e.g., audio and video), RTCP is used to monitor transmission statistics and quality of service (QoS) and aids synchronization of multiple streams. RTP is one of the technical foundations of Voice over IP and in this context is often used in conjunction with a signaling protocol such as the Session Initiation Protocol (SIP) which establishes connections across the network. RTP was developed by the Audio-Video Transport Working Group of the Internet Engineering Task Force (IETF) and first published in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swarthmore College
Swarthmore College ( , ) is a private liberal arts college in Swarthmore, Pennsylvania. Founded in 1864, with its first classes held in 1869, Swarthmore is one of the earliest coeducational colleges in the United States. It was established as a college "under the care of Friends, ndat which an education may be obtained equal to that of the best institutions of learning in our country." By 1906, Swarthmore had dropped its religious affiliation and officially became non-sectarian. Swarthmore is a member of the Tri-College Consortium, a cooperative academic arrangement with Bryn Mawr and Haverford College. Swarthmore also is affiliated with the University of Pennsylvania through the Quaker Consortium, which allows for students to cross-register for classes at all four institutions. Swarthmore offers over 600 courses per year in more than 40 areas of study, including an ABET-accredited engineering program that culminates in a Bachelor of Science in engineering. Swarthmore has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kenosha News
The ''Kenosha News'' is a daily newspaper published in Kenosha, Wisconsin, United States. With a circulation of 18,000 daily and 22,000 Sunday, the morning paper serves southeastern Wisconsin and northeastern Illinois. It was the original and flagship property of United Communications Corporation. The ''News'' also prints the free ''KN Sampler,'' which is delivered by mail to homes in the city of Kenosha, as well as select zip codes in Lake County, Illinois. In January 2019, Lee Enterprises purchased the ''Kenosha News'', as well as its sister paper, the ''Lake Geneva Regional News'', from United Communications Corporation. Early years The ''Kenosha News'' traces its history back to Wisconsin's first newspaper, the '' Green-Bay Intelligencer'', founded in 1833. In 1837, the ''Intelligencer'' was purchased by Charles Sholes, who moved his printing plant to Kenosha three years later and began printing the ''Southport Telegraph''. Sholes' brother Christopher, sometimes described ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
