The basic signaling pattern used in this pager is a sequence of coded binary data using the Post Office Code Standardization Advisory Group (POCSAG) code. The POCSAG code is a synchronous paging format that allows pages to be transmitted in a simple batch structure. The code accommodates both tone-only. The POCSAG code also provides improved battery-saving capability and an increased code capacity. The negative logic convention (?0?= high, ?1? =low) is used in this system. The POCSAG code format consists of a preamble and one or more batches of code words. Each batch comprises a 32-bit frame-synchronization code and eight 64-bit addresses frames of two 32-bit addresses or idle code words each. The frame-synchronization code makes the start of the batch code words. The pager is a localized instrument. It means the pager instrument accepts the, paged information from the transmitter. The effective of range of reception is usually in the range of 25 to 40KM from the transmitter. So it can be termed as a localized instrument. Another example of a localized instrument is a FM transmitter and receiver. The front panel of this pager trainer has all the important and necessary blocks of a pager. This contains several test points for waveform observations only. This has an alphanumeric LCD panel for displaying the incoming message. NOTE: You must send a pager instrument duly registered with a service provider in your area, while placing the purchase order. The scope of usage of this trainer is restricted to the extent of observing the waveforms only. There should be a transmitter and a service provider available in your area for actual demonstration and waveform observations. |
