Search results
Results from the WOW.Com Content Network
Hartford spent time to straighten these matters and compiled the "1967-1969 Most Often Needed Radio Diagram and Servicing Information" book. [ 6 ] Supreme would stop publishing by the early 1970s. One reason was the declining need for repairing consumer electronics due to the increased reliability and the low cost of electronics (cost less to ...
Ericsson Radio Systems AB was the name of a wholly owned subsidiary in the Ericsson sphere, founded on 1 January 1983 by buying out all former owners of Svenska Radioaktiebolaget (SRA). The company was well known in Scandinavia and elsewhere in the 1980s, as it was deploying NMT systems and developing a line of mobile telephones under the brand ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
Many early manual telephones had an attached hand-cranked magneto that produced an alternating current (AC) at 50–100 V for signaling to ring the bells of other telephones on the same (party) line, and to alert an operator at the local telephone exchange. These were most common on long rural lines served by small manual exchanges which did ...
With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the called customer's line.
HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and towns in the counties) HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges)
The first digital voice mode developed for EDACS was GE's Voice Guard, utilizing sub-band coding for its datastream at a rate of 9600 bps. Voice quality was not great, however, with it quickly being replaced by AEGIS. AEGIS was the second generation EDACS digital voice mode, made once again by GE, with Adaptive Multiband Encoding as its coding ...
[citation needed] As large cities had both manual and automatic exchanges for many years, the numbers for manual or automatic exchanges used the same format, which could be either spoken or dialed. [10] In the late 1940s, telephones were redesigned with the numbers and letters displayed on a ring outside the finger wheel to provide better ...