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(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.
References in periodicals archive ?
Guernsey's Office of Utility Regulation (OUR) said it had sought confirmation from mobile operators in Guernsey that they are prepared to offer MNP within Guernsey using the Jersey solution.
In these circumstances, MNP becomes an important consideration because it allows customers to churn between networks.
An official statement read, "The government has decided to extend the date of implementation of the full MNP in the networks by two months.
In a nutshell, it seems very difficult to roll out full MNP by May 3.
The success of MNP will ultimately depend on the porting time and charges -- however, in most markets where MNP has been introduced, it has led to some immediate churn and then the market tends to settle down at lower levels of churn, as operators start matching each others offers, making it more of a zero-sum game," Sukhdev Singh, associate vice-president at AMRB, told Gulf News.
The launch of MNP allows mobile users to switch between the country's two operators - Etisalat and du - while keeping the same number.
Speaking to Khaleej Times, Al Ghanim asked to wait for one year to judge the response and impact of the MNP for an apple-to-apple comparison, as one week was not enough to analyse the response with the countries where MNP had taken place.
sessions to raise awareness about the mechanics of MNP, discussing what it is,
Scheduled to take place on Tuesday 24th - Wednesday 25th April 2012; the international forum on Mobile Number Portability Implementation & Management will bring together key executives from operators, regulatory agencies, consultants and other industry organisations to deliberate, learn and gain first-hand knowledge and insight into realities of MNP and how best they can be managed.
Pakistan Telecommunication Authority (PTA) has revised its Mobile Number Portability (MNP) Code of Practices for all cellular companies for implementation of MNP system.
According to Antonyuk, MNP should be introduced in Russia for fixed-line and mobile operators.
In this report we look at the various factors affecting uptake of MNP services across different markets and analyse the strategies adopted by individual operators to carry out aggressive MNP campaigns as well as incumbent strategies aimed at limiting the impact of MNP.