MNP - Computer Definition
(Microcom Networking Protocol) A family of communications protocols from Microcom, Inc., Norwood, MA, that have become de facto standards for error correction (classes 2 through 4) and data compression (class 5). In 1997, Compaq acquired Microcom. Class 1: Half-duplex asynchronous transmission. This is an earlier mode that is no longer used. Class 2: Full-duplex asynchronous transmission. Class 3: Full-duplex synchronous transmission using HDLC framing techniques and 64-byte blocks. Start/stop bits are stripped. Class 4: Increased throughput. Shorter headers, frames up to 256 bytes. Some vendors adjust frame size based on line quality. Class 5: Compresses data up to two times. Class 6: Starts at V.22bis modulation and switches to V.29 if possible. Uses pseudo- duplexing ping-pong method for faster turnaround of V.29 transmission. Class 7: Compresses data up to three times. Class 8: Not in use. Class 9: Adds Piggy-back Acknowledgment** and selective retransmission for more efficient data transport. Provides better performance over variety of links. Class 10: Adds Adverse Channel Enhancements** for better transmission on rural, cellular and other noisy lines. ** Proprietary Microcom techniques.