DAA Line Connection for Caller ID Reception
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Solution Overview
Problem
Existing communications apparatuses face challenges in quickly and efficiently connecting to a telephone line for caller ID information reception, as they often require adjustments in line connection conditions to prevent large currents from flowing, which can lead to delayed or failed connections.
Innovation Solution
The implementation of a data access arrangement (DAA) that connects the communications apparatus to a telephone line based on a first ringing signal without adjusting the line connection conditions, allowing for rapid connection and preventing large currents, while also enabling connection for a short period without impedance consideration, and allowing for call reception without a third-party call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communications apparatus adjusts line connection conditions to prevent large currents, then the reliability of connection is improved, but the connection speed deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the line connection condition (setting the line voltage to a specific value) before the actual connection is established. When the first ringing signal is detected, the line is already configured with appropriate voltage settings, eliminating the need for post-detection adjustments. This pre-configuration ensures both rapid connection (improving speed) and proper current management (maintaining reliability).
2Speed
If the communications apparatus connects quickly without adjustment, then the connection speed is improved, but large currents may flow causing harmful effects
Solution Approach 1:
The patent applies parameter changes by modifying the line voltage parameter to a specific predetermined value before connection. This voltage setting is chosen to limit the current to safe levels while still enabling rapid connection. By changing this electrical parameter in advance, the system achieves fast connection speed without generating harmful large currents that would occur with unadjusted connections.
3Reliability
If the communications apparatus performs impedance adjustment, then the connection reliability is improved, but the complexity of the device increases
Solution Approach 1:
The patent applies the taking out principle by extracting and eliminating the complex impedance adjustment device from the system. Instead of using sophisticated adjustment mechanisms, the invention achieves reliable connection through a simple predetermined voltage setting. This removal of complex hardware simplifies the device structure while maintaining connection reliability through the simplified voltage-based approach.
Data Source
AI summary
A multifunction device previously stores a line connection condition of when a line interface received caller ID information in an EEPROM, and determines that a line with an exchange is connected based on a first ringing signal or a second ringing signal. When it is determined based on the first ringing signal that a line connection is a first type of connection, the line is connected according to the line connection condition. On the other hand, when it is determined based on the second ring signal that a line connection is a second type of connection, the line is connected using a line connection condition, which is adjusted by an adjustment device at the time of determination.