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1. Introduction
2. Binary Block Read Mode and Structure
2.1. Compressed Binary Block Read Sequence
2.2. Compressed Binary Block Structure
2.2.1. Data Block Structure
2.2.2. Record String Structure
3. Compression Decompression Methods
3.1. Table Decompression
3.1.1. Nibble Positioning
3.1.2. Record String Format
3.1.2.1. Data Decompression Considerations
3.1.3. Table Decompression Example
3.2. Space Compression
4. DLE Stuffing
5. The Cyclic Redundancy Check Option
5.1. Calculation
6. Customer Service
PollCat Series

2.2.2. Record String Structure

 

As shown in Figure 3, the Record String includes the following items:

 

 

Figure 3: Record String Structure

Record Header: The record header is made up of three components:

1                     Offset Byte: The binary offset to the next record.

2                     Mode Byte: The Mode Byte is described bit by bit: bit 0 is the LSB, bit 7 is the MSB.

3                     Character Count Byte "NCHAR": A binary count (up to 255) of the number of characters in the call record prior to compression.

 

 

Compressed Binary Data: The compressed binary representation of the actual call record. The compression / decompression method is explained in Section 3.