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CEBus
CEBus(r), short for Consumer Electronics Bus, also known as EIA-600, is a set of electrical standards and communication protocols for electronic devices to transmit commands and data. It is suitable for devices in households and offices to use, and might be useful for utility interface and light industrial applications.
In 1984, members of the Electronic Industries Alliance (EIA) identified a need for standards that included more capability than the de facto home automation standard X10. X10 provided blind transmission of the commands ON, OFF, DIM, BRIGHT, ALL LIGHTS ON, and ALL UNITS OFF over powerline carrier, and later infrared and short range radio mediums. Over a six-year period, engineers representing international companies met on a regular basis and developed a proposed standard. They called this standard CEBus (pronounced "see bus"). The CEBus standard was released in September 1992.
CEBus is an open architecture set of specification documents which define protocols for products to communicate through power line wire, low voltage twisted pair wire, coaxial cable, infrared, RF, and fiber optics.
The CEBus Standard was developed on the foundation of an IR (infrared) protocol developed by GE (General Electric). This work was transferred to the EIA at the beginning of the EIA's involvement, under the plan that it would be expanded then maintained by the EIA.
The CEBus standard includes such things as spread spectrum modulation on the power line. Spread spectrum involves starting a modulation at one frequency, and altering the frequency during its cycle. The CEBus power line standard begins each burst at 100 kHz, and increases linearly to 400 kHz during a 100 microsecond duration. Both the bursts (referred to as "superior" state) and the absence of burst (referred to as the "inferior" state) create similar digits, so a pause in between is not necessary.
A digit 1 is created by an inferior or superior state that lasts 100 microseconds, and a digit 0 is created by an inferior or superior state that lasts 200 microseconds. Consequently, the transmission rate is variable, depending upon how many of the characters are one and how many are zero; the average rate is about 7,500 bits per second. A 400 microsecond burst is an end of frame indicator and also saves time. For example, if the 32-bit destination address field has some of its most significant bits zero, they need not be sent; the end of frame delimits the field and all receiving devices assume the untransmitted bits are zero.
CEBus transmissions are strings or packets of data that also vary in length, depending upon how much data is included. Some packets can be hundreds of bits in length. The minimum packet size is 64 bits, which at an average rate of 7,500 bits per second, will take about 1/117th of a second to be transmitted and received.
Other media besides powerline carrier are specified: coaxial cable, infrared, radio frequency, and optical fiber. The initial offerings supported only a powerline carrier.
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CEBus
CEBus(r), short for Consumer Electronics Bus, also known as EIA-600, is a set of electrical standards and communication protocols for electronic devices to transmit commands and data. It is suitable for devices in households and offices to use, and might be useful for utility interface and light industrial applications.
In 1984, members of the Electronic Industries Alliance (EIA) identified a need for standards that included more capability than the de facto home automation standard X10. X10 provided blind transmission of the commands ON, OFF, DIM, BRIGHT, ALL LIGHTS ON, and ALL UNITS OFF over powerline carrier, and later infrared and short range radio mediums. Over a six-year period, engineers representing international companies met on a regular basis and developed a proposed standard. They called this standard CEBus (pronounced "see bus"). The CEBus standard was released in September 1992.
CEBus is an open architecture set of specification documents which define protocols for products to communicate through power line wire, low voltage twisted pair wire, coaxial cable, infrared, RF, and fiber optics.
The CEBus Standard was developed on the foundation of an IR (infrared) protocol developed by GE (General Electric). This work was transferred to the EIA at the beginning of the EIA's involvement, under the plan that it would be expanded then maintained by the EIA.
The CEBus standard includes such things as spread spectrum modulation on the power line. Spread spectrum involves starting a modulation at one frequency, and altering the frequency during its cycle. The CEBus power line standard begins each burst at 100 kHz, and increases linearly to 400 kHz during a 100 microsecond duration. Both the bursts (referred to as "superior" state) and the absence of burst (referred to as the "inferior" state) create similar digits, so a pause in between is not necessary.
A digit 1 is created by an inferior or superior state that lasts 100 microseconds, and a digit 0 is created by an inferior or superior state that lasts 200 microseconds. Consequently, the transmission rate is variable, depending upon how many of the characters are one and how many are zero; the average rate is about 7,500 bits per second. A 400 microsecond burst is an end of frame indicator and also saves time. For example, if the 32-bit destination address field has some of its most significant bits zero, they need not be sent; the end of frame delimits the field and all receiving devices assume the untransmitted bits are zero.
CEBus transmissions are strings or packets of data that also vary in length, depending upon how much data is included. Some packets can be hundreds of bits in length. The minimum packet size is 64 bits, which at an average rate of 7,500 bits per second, will take about 1/117th of a second to be transmitted and received.
Other media besides powerline carrier are specified: coaxial cable, infrared, radio frequency, and optical fiber. The initial offerings supported only a powerline carrier.