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MOTOROLA Technical Developments
SYSTEM CODEPLUG REPROGRAMMING
by John Cherney and Hans Christopher Sowa
SYSTEM BACKGROUND
The system is a Conventional or Trunked Land Mobile Radio System. Radios can roam from system to system and each system is capable of sending codeplugs over-the-air via a system codeplug manager.
THE PROBLEM
When a radio roams from system to system, it must be able to communicate with that location's system. In order to do this, the radio, would generally contain codeplug information about every possible system and that system's personalities. This results in very large codeplugs, for which there may be no storage space in the radio. A change in one of these large codeplug may require a change in every radio, making it difftcult to keep every radio up to date.
THE SOLUTION
A solution to this problem would be to have a
codeplug that contains two distinct sections:
I) A small permanent section of the codeplug that contains enough information to allow the radio to locate and communicate with every system, and
2) A large temporary section of the codeplug that can be programmed by the system codeplug manager.
Using the permanent section of the codeplug, the radio can always communicate with whichever system is in range. Given that the radio can commu- nicate with a system, it can communicate with the system codeplug manager associated with that system. The system codeplug manager can then program over-the-air or download via wireline the codeplug f...
