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2. Digital Access Signalling System 2 - Wikipedia

   en.wikipedia.org/wiki/Digital_Access_Signalling...

   DASS2 (Digital Access Signalling System) is a BT-designed signalling standard, and was introduced before the Q.931 standard was finalised by the international community. British Telecom used the term ISDN when describing their DASS2 lines. DASS2 lines are provided to customers on a 2 Mbit/s link and can handle 30 simultaneous calls (64 kbit/s ...

3. Digital access carrier system - Wikipedia

   en.wikipedia.org/wiki/Digital_Access_Carrier_System

   Digital access carrier system. (Redirected from Digital Access Carrier System) Digital access carrier system (DACS) is the name used by British Telecom ( BT Group plc) in the United Kingdom for a 0+2 pair gain system. Two Telspec DACS remote units mounted on a pole.

4. Redcare - Wikipedia

   en.wikipedia.org/wiki/RedCARE

   Redcare Classic works below the voice frequency spectrum on a phone line in order to avoid interference with calls or broadband, which uses frequencies above the voice spectrum. Other versions also use GSM (mobile) as a backup to the main phone line or can function using either wireless ( 2G / 3G mobile data) or IP as the primary connection all ...

5. Ringer equivalence number - Wikipedia

   en.wikipedia.org/wiki/Ringer_equivalence_number

   The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line.In the United States, ringer equivalence was first defined by U.S. Code of Federal Regulations, Title 47, Part 68, based on the load that a standard Bell System model 500 telephone represented, and was later determined in accordance with ...

6. QR Codes Are Reshaping Public Transit, But Are They Safe? - AOL

   www.aol.com/qr-codes-reshaping-public-transit...

   In most cases, those QR codes still connect to some form of data to make them work, so even when boarding public transit, a user might be giving the transit agency that data. Sarah Kaufman from ...

7. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...