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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 ...
Virtually all new cordless phones sold in the US use DECT 6.0 on the 1.9 GHz band, though legacy phones can remain in use on the older 900 MHz, 2.4 GHz and 5.8 GHz bands. There is no specific requirement for any particular transmission mode on the older bands, but in practice many legacy phones also have digital features such as DSSS and FHSS .
Hanging up the phone after this would result in a ring back. When the ring back was answered, the ring back process could be repeated by hanging up and lifting up the phone quickly again, and then hanging up. Most other numbers listed for ringback are specific to one exchange or one telco; available lists tend to be outdated and unreliable.
Most Ericofons had mechanical rotary dials, typical of all phones made in the era. While Ericofons produced by Ericsson used miniature buzzers as ringers, North Electric introduced the electronic "Ericotone" ringer. The Ericotone ringer used a simple, one-transistor oscillator circuit to produce a distinctive "chirping" sound. Colloquially ...
A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...
[3] When the membrane phone series was replaced with the new SP- and BIS- phone series, these color choices were all eliminated except black. The original Merlin was replaced with the Merlin Plus system in the late 1980s, using circuit cards to be expandable to 8 lines and 20 telephones, much like the original 820 model.
The UK Health Protection Agency (HPA) claims that due to a mobile phone's adaptive power ability, a European DECT cordless phone's radiation could actually exceed the radiation of a mobile phone. A European DECT cordless phone's radiation has an average output power of 10 mW but is in the form of 100 bursts per second of 250 mW, a strength ...
Telephone magneto viewed from beneath shows the armature (inset, left) and the horseshoe field magnets, and the gears to drive the rotor. A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature.
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