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A typical volume of Bell System Practices from the 1970s. The Bell System Practices (BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1]
Auto-zero amplifiers use a secondary auxiliary amplifier to correct the input offset voltage of a main amplifier. Chopper-stabilized amplifiers use a combination of auto-zero and chopper techniques to give some excellent DC precision specifications. [2] Some example chopper and auto-zero amplifiers are LTC2050, [3] MAX4238/MAX4239 [4] and ...
2: Ready to start: Start train 2—2: Do not open doors: Passing automatic signal at 'on' 3: Set Back: Guard required by driver 3—1: Lock central door locking: 3—2—1: Testing doors: 3—3: Guard required by driver, or guard or driver to speak on the telephone: Guard's warning when the motorman exceeds the speed prescribed 3—3—1 ...
Box B sends 4 bells to box A. (Acknowledgement, if in the position to accept the train giving permission for box A to signal the train into the block controlled by B.) (when the signalled train enters the portion of line between A and B.) Box A sends 2 bells to box B (Train entering section) as the train passes box A and enters the block ...
The 2.2l S10/Sonoma had the starter located in the same position as front wheel drive cars. A rear wheel drive bellhousing is displayed at right, and the integrated front wheel drive bellhousing is displayed at the lower right (in this case, as a part of the GM 6T70 Transmission). GM 60-Degree 2.8/3.1/3.4/3.5/3.9 L V6 (also used by AMC) Buick ...
An opcode table (also called an opcode matrix) is a visual representation of all opcodes in an instruction set. It is arranged such that each axis of the table represents an upper or lower nibble, which combined form the full byte of the opcode.
The code 0x2F is used in EBCDIC. In the programming language C (created in 1972), and in many languages influenced by it such as Python, the bell character can be placed in a string or character constant with \a. 'a' stands for "alert" or "audible" and was chosen because \b was already used for the backspace character. [4]
The DEC DF112 from the mid-1980s used the Bell 202 protocol. The Bell 202 modem was an early (1976) modem standard developed by the Bell System. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second (bit/s), half-duplex. It has separate sets of circuits for 1200 bit/s and 300 bit/s rates. [1]