PSTN Modem Quick Connection Protocol
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing modem connection protocols take too long to establish a duplex connection, especially over channels with long signal propagation times, and are inefficient in reconnecting after interference, due to repetitive setup procedures and noise interference affecting echo compensator accuracy.
Innovation Solution
A new protocol that allows PSTN modems to connect quickly by identifying channel characteristics, setting echo compensators, and coordinating data transfer using a multiple access protocol without pre-allocating roles, with features like random pause assignment and adaptive parameter negotiation, enabling duplex mode data transmission with separated reception and transmission signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional modem connection protocols are used to establish duplex connection, then connection reliability is ensured through complete parameter identification and echo compensator setup, but connection time exceeds acceptable limits (at least 7 seconds)
Solution Approach 1:
The patent applies preliminary action by pre-configuring modems with stored channel characteristics and connection parameters before actual connection is needed. When a connection request occurs, the modem retrieves pre-calibrated settings rather than performing complete identification and echo compensator setup from scratch, dramatically reducing connection time while maintaining reliability through pre-validated parameters
Solution Approach 2:
The patent implements dynamics by making the connection protocol adaptive and flexible. The system dynamically adjusts the connection process based on channel conditions, storing and retrieving different parameter sets for different channel characteristics. This allows the connection procedure to be optimized for specific conditions rather than following a fixed rigid sequence, reducing average connection time while ensuring reliability across varying conditions
2Measurement precision
If modems perform complete channel identification and echo compensator setup after disconnection, then connection accuracy is maintained, but reconnect time is multiplied and becomes excessively long
Solution Approach 1:
The patent applies preliminary action by pre-storing channel characteristics and connection parameters in the modem's memory before disconnection occurs. When reconnection is needed, the modem retrieves these pre-calibrated parameters immediately rather than repeating the complete identification process, maintaining measurement precision through pre-validated data while reducing reconnect time from seconds to milliseconds
Solution Approach 2:
The patent uses copying by creating and storing copies of channel characteristics and connection parameters in the modem's memory. Instead of重新 measuring and identifying channel parameters after each disconnection, the system copies pre-identified parameters from storage, ensuring accuracy through the original precise measurements while enabling instant reconnection through rapid parameter retrieval
3Productivity
If modems operate in duplex mode with simultaneous training sequence transmission, then data transmission capability is achieved, but echo compensator setup accuracy deteriorates due to noise interference
Solution Approach 1:
The patent applies preliminary action by completing the echo compensator setup and channel identification processes before initiating duplex data transmission. The modem pre-configures all necessary parameters and compensators during an initial setup phase, then uses these pre-established settings for high-speed duplex communication without the noise interference that would occur during simultaneous setup and transmission
Solution Approach 2:
The patent applies segmentation by dividing the connection and transmission process into distinct phases: first completing channel identification and echo compensator setup, then transitioning to duplex data transmission. This temporal segmentation separates the sensitive measurement phase from the high-speed transmission phase, preventing noise from compromising compensator accuracy while maintaining full duplex capability
Data Source
AI summary
A method of quick set up of PSTN modem connection is proposed. The method of quick set up of PSTN modem connection comprises: setting access to the data channel, identifying channel characteristics, configuring PSTN modems depending on the characteristics of the channel, configuring echo compensators of PSTN modems, negotiating the connection protocol and data transfer between PSTN modems according to the configuration using the agreed protocol where: data transmission is carried out in duplex mode with the separation of signals of reception and transmission by echo compensation, identification of channel characteristics and adjustment of the echo compensator of each of the PSTN modems is performed, respectively, when receiving and transmitting at least one training sequence by each PSTN modem, access to the data channel is carried out by sending call by PSTN modem, which contains the training sequence and connection parameters for negotiation, where using a multiple access protocol, when each of the PSTN modems is connected to the data channel asynchronously, without agreeing on the time of connection and without the need to pre-allocate the roles of calling and responding modems.