As you see, the signal contains several codewords (Synchronization, Preamble, Address, Message, and Idle). Preamble Structureįigure 2 shows the signal format.
The frame synchronization code marks the start of the batch of codewords. Each batch comprises a 32-bit frame synchronization code, and eight 64-bit address frames of two 32-bit addresses or idle codewords each. The POCSAG code format consists of a preamble and one or more batches of codewords. The POCSAG code provides improved battery-saving capability and an increased code capacity. The POCSAG code is a synchronous paging format that allows pages to be transmitted in a single-batch structure. GeneralThe basic signaling pattern used in many pagers is a sequence of coded binary data using the Post Office Code Standardization Advisory Group (POCSAG) code. The modem connects to the serial port of a computer and sends the message on the air through a transmitter. I also wrote the code for sending the encoded message to the end user using a special modem. The website has many useful information for various wireless technologies including pager.
I grabbed most of the information about the POCSAG protocol from Brad Dye's Paging Information Resource website. For this purpose, I used my previous article, BCH 21,31, for implementing a BCH Error Correction Code that is part of the POCSAG protocol that we are going to see in the following sections. This article is an effort for doing the same task using only software code. If you search Google for POCSAG Encoder/Decoder, you will find many devices from various companies. The pager uses a protocol named POCSAG or Post Office Code Standardization Advisory Group code. One of the popular technologies that has been used for many years, in many industries, is the pager. Every technology has its advantages and disadvantages. We have available many communication technologies to communicate with each other.
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