![]() ![]() New!!: DigiCipher 2 and Communications satellite New!!: DigiCipher 2 and Cable television Ī communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder it creates a communication channel between a source transmitter and a receiver at different locations on Earth. New!!: DigiCipher 2 and Arris International Ĭable television is a system of delivering television programming to paying subscribers via radio frequency (RF) signals transmitted through coaxial cables, or in more recent systems, light pulses through fiber-optic cables. Arris InternationalĪrris International Plc is a British telecommunications equipment manufacturing company incorporated in England and Wales that provides cable operators with data, video and telephony systems for homes and businesses. Ģ2 relations: Arris International, Cable television, Communications satellite, Data compression, Digital cable, Digital Video Broadcasting, Dolby Digital, Encryption, General Instrument, Google, Huffman coding, Metadata, Motorola, PrimeStar, Program and System Information Protocol, Satellite television, Set-top box, Shaw Direct, Television, Tuner (radio), Virtual channel, 4DTV. ![]() DigiCipher II uses Dolby Digital AC-3 audio for all channels, although MPEG-1 Level 2 audio is not supported.DigiCipher 2, or simply DCII, is a proprietary standard format of digital signal transmission and it doubles as an encryption standard with MPEG-2/MPEG-4 signal video compression used on many communications satellite television and audio signals. Also unlike DVB, all text used in descriptors can be compressed using standard Huffman coding which saves on broadcast bandwidth and loading times. ![]() There are also private non-standard additions to DVB that add virtual channel remapping using logical channel numbers. DigiCipher 2 also extends the MPEG program number that is assigned for each service in a transport stream with the concept of a virtual channel number, whereas the DVB system never defined this type of remapping preferring to use a registry of network identifiers to further differentiate program numbers from those used in other transport streams. The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI metadata, or System Information, where DVB reserves packet identifiers from 16 to 31 for metadata, DigiCipher reserves only packet identifier 8187 for its master guide table which acts as a look-up table for all other metadata tables. Technical specifications ĭigiCipher II uses QPSK and BPSK at the same time. The DigiCipher 2 encryption standard was reverse engineered in 2016. DCII is also used on Motorola's 4DTV digital satellite television tuner and Shaw Direct's DBS receiver. The use of DCII is most prevalent in North American digital cable television set-top boxes. The DCII standard predates wide acceptance of DVB-based digital terrestrial television compression (although not cable or satellite DVB) and therefore is incompatible with the DVB standard.Īpproximately 70% of newer first-generation digital cable networks in North America use the 4DTV/DigiCipher 2 format. The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct PrimeStar medium-power direct broadcast satellite (DBS) system during the early 1990s. The DCII standard was originally developed in 1997 by General Instrument, which then became the Home and Network Mobility division of Motorola, then bought by Google in Aug 2011, and lastly became the Home portion of the division to Arris. JSTOR ( September 2014) ( Learn how and when to remove this template message)ĭigiCipher 2, or simply DCII, is a proprietary standard format of digital signal transmission and it doubles as an encryption standard with MPEG-2/MPEG-4 signal video compression used on many communications satellite television and audio signals.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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