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What is Spread Spectrum Carrier (SSC) Technology?
Spread spectrum technology continues to gain acceptance as the Communication technology of choice for industrial automation applications and Utility's AMR. For the major AMR Systems manufacturers of Power Line Carrier Modems (PLCs), Concentrator Units (CUs) and other data acquisition, control and processing equipment, data communications reliability and integrity are paramount for the often challenging environments encountered in real world Distributed Control System (DCS) and Automatic Meter Reading System (AMR) installations. The principal of AMR Systems manufacturers are often dependent uponPLC's modem communications to transmit data between their equipment and other devices such as Energy meters, water meters and PCs in multi-point applications at very long range.
Today, with the recent introduction of advanced spread spectrum techniques, even extensive PLC and AMR requirements can now be addressed and satisfied.
Spread spectrum technology employs two separate techniques for data transmission, referred to as Frequency Hopping and Direct Sequence (see diagram). For the industrial data acquisition and control market, including PLC's AMR, SCADA applications, the frequency hopping technique is particularly useful where reliability and data integrity are more important than the timeliness of data transmission, especially when the difference is measured in milliseconds. With advanced technology spread spectrum modems, full duplex uncompressed data rates at 115.2 Kbaud are available for line-of-sight range capability of 20 to 30 miles at 1 watt power output using a standard omni directional whip antenna (In case using SSC in Wireless/RF modems).
In summary, data transmission using SSC, continues to benefit from rapid advancements in the technology. The commercial market is now enjoying the results of an extensive research program conducted by the military over an extended period in its effort to insure reliable data integrity even under the most challenging battlefield conditions where the ability to maintain communications in the face of purposeful attempts at jamming is clearly essential. Additional applied research by the private sector, designed specifically for the requirements of the industrial automation customer, have added features and benefits appropriate for such end users.
What is AMR ?
What is Spread Spectrum Carrier ?
Why is Power line Carrier (PLC) conceder as the best Media for AMR ?
