Multichannel Multipoint Distribution Service
- MMDS is also an acronym for Mortality Medical Data System.
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Broadband Radio Service (BRS) formerly known as Multichannel Multipoint Distribution Service (MMDS), also known as Wireless Cable, is a wireless telecommunications technology, used for general-purpose broadband networking or, more commonly, as an alternative method of cable television programming reception. MMDS is used in The United States, Canada, Mexico, Dominican Republic, Iceland, Ireland, Ukraine, Russia, Slovakia, Bolivia, Brazil, Barbados, Australia, Nigeria, Pakistan, Panama, Sri Lanka, Thailand, Uruguay, India, Belarus, Lebanon, Cambodia and Kazakhstan. It is most commonly used in sparsely populated rural areas, where laying cables is not economically viable, although some companies may also offer MMDS services in urban areas.
The BRS band uses microwave frequencies at 2.1 GHz and from 2.5 GHz to 2.7 GHz. Reception of BRS-delivered television and data signals is done with a rooftop microwave antenna. The antenna is attached to a down-converter or transceiver to receive and transmit the microwave signal and convert them to frequencies compatible with standard TV tuners (much like on satellite dishes where the signals are converted down to frequencies more compatible with standard TV coaxial cabling), some antennas use an integrated down-converter or transceiver. Digital TV channels can then be decoded with a standard cable set-top box or directly for TVs with integrated digital tuners. Internet data can be received with a standard DOCSIS Cable Modem connected to the same antenna and transceiver.
The MMDS band is separated into 33 6 MHz "channels" (31 in USA) which may be licenced to cable companies offering service in different areas of a country. The concept was to allow entities to own several channels and multiplex several television, radio, and later Internet data onto each channel using digital technology. Just like with Digital Cable channels, each channel is capable of 30.34 Mbit/s with 64QAM modulation, and 42.88 Mbit/s with 256QAM modulation. Due to forward error correction and other overhead, actual throughput is around 27 Mbit/s for 64QAM and 38 Mbit/s for 256QAM.
The newer BRS Band Plan makes changes to channel size and licensing in order to accommodate new WIMAX TDD fixed and mobile equipment.
MMDS and DOCSIS+ 
Local Multipoint Distribution Service (LMDS) and BRS have adapted the DOCSIS (Data Over Cable Service Interface Specification) from the cable modem world. The version of DOCSIS modified for wireless broadband is known as DOCSIS+.
Data-transport security is accomplished under BRS by encrypting traffic flows between the broadband wireless modem and the WMTS (Wireless Modem Termination System) located in the base station of the provider's network using Triple DES.
DOCSIS+ reduces theft-of-service vulnerabilities under BRS by requiring that the WMTS enforce encryption, and by employing an authenticated client/server key-management protocol in which the WMTS controls distribution of keying material to broadband wireless modems.
LMDS and BRS wireless modems utilize the DOCSIS+ key-management protocol to obtain authorization and traffic encryption material from a WMTS, and to support periodic reauthorization and key refresh. The key-management protocol uses X.509 digital certificates, RSA public key encryption, and Triple DES encryption to secure key exchanges between the wireless modem and the WMTS.
MMDS provided significantly greater range than LMDS.
MMDS was sometimes expanded to Multipoint Microwave Distribution System or Multi-channel Multi-point Distribution System. All three phrases refer to the same technology.
Current status 
In the United States, WATCH Communications (based in Lima, Ohio), Eagle Vision (based in Kirksville, MO), and several other companies offer MMDS-based wireless cable television, Internet access, and IP-based telephone services.
With T-Mobile USA acquiring the 2.1 GHz AWS band (old MDS band) in most areas of the country, which is used for the modem upstream in MMDS DOCSIS, the future of this kind of service in the USA is in doubt. However, new CPE equipment allows operators to use part of the main 2.5 – 2.7 GHz MMDS spectrum for modem upstream, ensuring future operation in the United States. With newer WiMAX equipment available, some companies[who?] are looking to deploy mobile services instead of fixed services for future expansion.
In certain areas, BRS is being deployed for use as wireless high-speed Internet access, mostly in rural areas where other types of high-speed internet are either unavailable (such as cable or DSL) or prohibitively expensive (such as satellite internet). CommSPEED is a major vendor in the US market for BRS-based internet.
AWI Networks (formerly Sky-View Technologies) operates a number of MMDS sites delivering high-speed Internet, VoIP, and digital TV services in Southern Utah, USA. AWI has recently[when?] upgraded several sites to DOCSIS 3.0 hardware, delivering download speeds up to 100 Mbit/s. DOCSIS 3.0 has improved peak bandwidth, lower latency, and improved reliability over previous DOCSIS versions.
In the early days of MMDS, it was known as "Wireless Cable" and was used in a variety of investment scams that still surface today. Frequent solicitations of Wireless Cable fraud schemes were often heard on talk radio shows like The Sonny Bloch Show in the mid-1990s.
In Ireland, since 1990, UPC Ireland (previously Chorus and NTL Ireland) offer MMDS TV services almost nationwide. The frequency band initially allocated was 2500–2690 MHz (the “2.6GHz band”) consisting of 22–23 8 MHz analogue channels; digital TV was restricted to 2524–2668 MHz, consisting of 18 8 MHz digital channels. Two digital TV standards are used: DVB-T/MPEG-2 in the old Chorus franchise area and DVB-C/MPEG-2 in the old NTL franchise area. The existing licences were to expire 18 April 2014 but Comreg, the Irish communications regulator, extended the licences for a further 2 years to 18 April 2016 at which date they will expire together with all associated spectrum rights of use. The 2.6 GHz band spectrum will be auctioned off so that when the existing MMDS licences expire new rights of use can issue on a service and technology neutral basis (by means of new licences). As a result, holders of the new rights of use may choose to provide any service capable of being delivered using 2.6 GHz spectrum. For instance, they could distribute television programming content, subject to complying with the relevant technical conditions and with any necessary broadcasting content authorisations, or they could adopt some other use.
In Iceland, since November 2006 Vodafone Iceland runs Digital Ísland (Digital Iceland) - the broadcasting system for 365 (media corporation), (previously operated by 365 Broadcast Media). Digital Ísland offers digital MMDS television services using DVB-T technology alongside a few analogue channels. The MMDS frequency range extends from 2500–2684 MHz for a total of 23 8 MHz channels, Of these, 21 are considered usable for broadcasting in Iceland. Analogue MMDS broadcasting began in 1993, moving to digital in 2004.
In Brazil, the MMDS technology was shut down in 2012 to release the frequency for the LTE-UTRAN band in 2500–2600 Mhz. The national shutdown is planned to be finished at the end of 2012.
In Dominican Republic, Wind Telecom started operations using MMDS technology in 2008; at that time and ever since it became a pioneer taking advantage of such implementations. The company uses the DVB standard for its digital television transmissions.
See also 
- http://www.sos.state.ms.us/regenf/Securities/Scams.asp Wireless Cable Scams
- http://www.nytimes.com/1995/05/26/business/sonny-bloch-radio-show-host-charged-with-fraud.html Sonny Bloch Radio Show Host Charged with Fraud
- The Launch of the MMDS TV Distribution System 12.04.1990
- ComReg Ireland Final Decision on proposal to renew the existing MMDS licences from 19 April 2014 to 18 April 2016
- FCC BRS Homepage
- What is MMDS?
- Vodafone Digital Ísland MMDS
- Íslenska Fjarskiptahandbókin Digital Ísland info