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PacketCable
PacketCable network is a technology specification defined by the industry consortium CableLabs for using Internet Protocol (IP) networks to deliver multimedia services, such as IP telephony, conferencing, and interactive gaming on a cable television infrastructure. The PacketCable technology is based on the DOCSIS base with extensions that enable cable operators to deliver data and voice traffic efficiently using a single high-speed, quality-of-service (QoS)-enabled broadband (cable) architecture. The PacketCable effort dates back to 1997 when cable operators identified the need for a real-time multimedia architecture to support the delivery of advanced multimedia services over the DOCSIS architecture. The original PacketCable specifications were based on the physical network characteristics of operators in the U.S. For the European market, Cable Europe Labs, maintains a separate, but equivalent effort, ''EuroPacketCable'', based on European network implementations. Technical ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Network-based Call Signaling
Network-based Call Signaling (NCS) is a profile of the Media Gateway Control Protocol (MGCP) for use in PacketCable applications for voice-over-IP. A network implementing NCS is designed according to the media gateway control protocol architecture for interconnecting a packet network with the traditional public switched telephone network (PSTN). This architecture physically decomposes the functionality of providing complete end-to-end multimedia telecommunication sessions into several discrete components, notably a media gateway (MG) located at the customer premises that performs the physical translation between analog voice or video streams to packetized digital data, and a media gateway controller (MGC) which is a centralized server that controls typically many media gateways and manages the complexity of call setup, resource negotiation, call routing, and tear-down. In addition, the architecture also uses signaling gateways to the traditional telecommunication channels, such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP Multimedia Subsystem
The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched-style network, rather than strictly over an IP packet-switched network. Alternative methods of delivering voice (VoIP) or other multimedia services have become available on smartphones, but they have not become standardized across the industry. IMS is an architectural framework that provides such standardization. IMS was originally designed by the wireless standards body 3rd Generation Partnership Project (3GPP), as a part of the vision for evolving mobile networks beyond GSM. Its original formulation (3GPP Rel-5) represented an approach for delivering Internet services over GPRS. This vision was later updated by 3GPP, 3GPP2 and ETSI TISPAN by requiring support of networks other than GPRS, such as Wireless LAN, CDMA2000 and fixed lines. IM ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP Telephony
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 protocols th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cable Television
Cable television is a system of delivering television programming to consumers via radio frequency (RF) signals transmitted through coaxial cables, or in more recent systems, light pulses through fibre-optic cables. This contrasts with broadcast television (also known as terrestrial television), in which the television signal is transmitted over-the-air by radio waves and received by a television antenna attached to the television; or satellite television, in which the television signal is transmitted over-the-air by radio waves from a communications satellite orbiting the Earth, and received by a satellite dish antenna on the roof. FM radio programming, high-speed Internet, telephone services, and similar non-television services may also be provided through these cables. Analog television was standard in the 20th century, but since the 2000s, cable systems have been upgraded to digital cable operation. A "cable channel" (sometimes known as a "cable network") is a tele ... [...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 speech, 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, Short Message Service, 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 spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CableLabs
Cable Television Laboratories, Inc. (CableLabs) is a nonprofit corporation promoting innovation as a research and development lab founded in 1988 by American cable operators. System operators from around the world are eligible to be members. The DOCSIS standard for cable Internet access was originally developed by CableLabs and contributing companies, including Arris, BigBand Networks, Broadcom, Cisco, Comcast, Conexant, Correlant, Cox, Harmonic, Intel, Motorola, Netgear, Terayon, Time Warner Cable, and Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globall .... See also * References External links * CableLabs Specifications Database {{Authority control Boulder County, Colorado Cable television in the United States Intelligent Community Forum Non-profit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
μ-law Algorithm
The μ-law algorithm (sometimes written Mu (letter), mu-law, often typographic approximation, approximated as u-law) is a companding algorithm, primarily used in 8-bit PCM Digital data, digital telecommunication systems in North America and Japan. It is one of two versions of the G.711 standard from ITU-T, the other version being the similar A-law algorithm, A-law. A-law is used in regions where digital telecommunication signals are carried on E-1 circuits, e.g. Europe. Companding algorithms reduce the dynamic range of an audio Signal (electrical engineering), signal. In analog systems, this can increase the signal-to-noise ratio (SNR) achieved during transmission; in the digital domain, it can reduce the quantization error (hence increasing the signal-to-quantization-noise ratio). These SNR increases can be traded instead for reduced Bandwidth (signal processing), bandwidth for equivalent SNR. Algorithm types The μ-law algorithm may be described in an analog form and in a qua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A-law
An A-law algorithm is a standard companding algorithm, used in European 8-bit PCM digital communications systems to optimize, i.e. modify, the dynamic range of an analog signal for digitizing. It is one of two versions of the G.711 standard from ITU-T, the other version being the similar μ-law, used in North America and Japan. For a given input x, the equation for A-law encoding is as follows: F(x) = \sgn(x) \begin \dfrac, & , x, < \dfrac, \\ ex \dfrac, & \dfrac \leq , x, \leq 1, \end where is the compression parameter. In Europe, . A-law expansion is given by the inverse function: The reason for this encoding is that the wide |
ILBC
Internet Low Bitrate Codec (iLBC) is a royalty-free narrowband speech audio coding format and an open-source reference implementation (codec), developed by Global IP Solutions (GIPS) formerly Global IP Sound (acquired by Google Inc in 2011). It was formerly freeware with limitations on commercial use, but since 2011 it is available under a free software/open source ( 3-clause BSD license) license as a part of the open source WebRTC project. It is suitable for VoIP applications, streaming audio, archival and messaging. The algorithm is a version of block-independent linear predictive coding, with the choice of data frame lengths of 20 and 30 milliseconds. The encoded blocks have to be encapsulated in a suitable protocol for transport, usually the Real-time Transport Protocol (RTP). iLBC handles lost frames through graceful speech quality degradation. Lost frames often occur in connection with lost or delayed IP packets. Ordinary low-bitrate codecs exploit dependencies between spee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Codec
A codec is a device or computer program that encodes or decodes a data stream or signal. ''Codec'' is a portmanteau of coder/decoder. In electronic communications, an endec is a device that acts as both an encoder and a decoder on a signal or data stream, and hence is a type of codec. ''Endec'' is a portmanteau of encoder/decoder. A coder or encoder encodes a data stream or a signal for transmission or storage, possibly in encrypted form, and the decoder function reverses the encoding for playback or editing. Codecs are used in videoconferencing, streaming media, and video editing applications. History In the mid-20th century, a codec was a device that coded analog signals into digital form using pulse-code modulation (PCM). Later, the name was also applied to software for converting between digital signal formats, including companding functions. Examples An audio codec converts analog audio signals into digital signals for transmission or encodes them for storage. A receiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teletica
Televisora de Costa Rica S.A., known as Teletica is a Costa Rican television broadcaster, founded in 1958. It operates Teletica Canal 7, XperTV Canal 33, and, since 1991 (partially since 2018), CableTica (now called Liberty). History In October 1958 an agreement was signed that gave rise to Televisora de Costa Rica S.A., Teletica Channel 7. Mario Echandi, President of Costa Rica, decided to grant licenses to public television. Two men were his predecessors, René Picado Esquivel and Carlos Manuel Reyes and his wife Andreina Otalvaro. On May 9, 1960 the first television broadcast was held. In the same year, the first newscast of Costa Rica would be created, called the word of Costa Rica, which one month later changed its name to what is now known as Telenoticias. In 1962, Teletica transmitted the visit of then US President, John F. Kennedy. In 1963, the first mobile television unit was installed, which could expand the information programs live from outside the facilities. By 196 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cable One
Cable One, Inc. is an American broadband communications provider. Under the Sparklight brand, it provides service to 21 states and 900,000 residential and business customers. It is headquartered in Phoenix, Arizona, though it does not serve that metro area. A former subsidiary of Graham Holdings Company, its name was changed in 1997 from Post-Newsweek Cable. In summer 2019, Cable One re-branded itself as Sparklight, seeking to promote its internet services more than cable TV offerings. Equipment with Cable One branding is still used by longtime customers, but new customers get equipment with Sparklight branding. Cable One's original URL, cableone.net, redirects to sparklight.com. Sparklight provides broadband service via cable (DOCSIS) through most of its footprint, and fiber-to-the-home in limited areas. Sparklight provides phone service plans such as Economy Phone, Standard Phone, and Elite Package with Starter Plan Plus. Sparklight offers three cable TV plans: Economy Cab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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