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In telecommunications, a plant test number is a telephone number reserved for use by telephone installers or other workers to test an individual telephone line. Test numbers are typically unlisted. The North American Numbering Plan (NANP) reserves the exchange (central office) prefixes 958 and 959 for plant testing. [1]
Use of the title requires licensure or certification in most states. The licensure or certification also requires a prelicensure examination through the ASWB (Association of Social Work Boards), with the exception of the State of California, who creates and administers their own licensing exam.
By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the central office that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians ...
Amid growing anxieties surrounding reported drone sightings, the FBI has issued a warning against a new trend of pointing lasers at aircrafts.
Numbers within these test exchange block ranges are used for various types of local and long-distance testing; generally, this block includes a ringback number (to test the ringer when installing telephone sets) and a loop around (which connects a call to another inbound call to the same or another test number).
The test consists of transmitting an analog sinusoidal signal at the frequency of 1004 Hz with the power level of 0 (zero) dBm. By definition, this is the equivalent of a continuous power dissipation of 1 mW ( milliWatt ), i.e., the power consumed if a voltage of 0.775 V ( RMS ) is applied to a telephone line with 600 Ohm nominal impedance.
In the 1960s, the electrical industry was booming thanks to lower prices and the huge increase in the number and reach of power lines, making electricity more in demand than ever before. By 1972, it was widely recognized that this rapid growth demanded some oversight to promote safety, system reliability , and quality testing.
The test, which on Wednesday received emergency-use authorization from the U.S. Food and Drug Administration, measures the number of neutralizing antibodies that the body's immune system has ...