Core Viewpoint - The article discusses the reasons behind the heat generation in USB cables compared to Ethernet cables, highlighting the differences in their design and functionality [1][2][3][4]. Group 1: USB Heat Generation - USB interfaces and cables are designed to provide both power and data transmission, leading to significant heat generation, especially during fast charging where current can reach up to 5A [1][3]. - The presence of micro contact resistance at the metal contacts of USB interfaces can increase heat due to oxidation or dirt accumulation over time [1]. - The compact design of USB Type-C connectors makes it difficult for heat to dissipate, causing heat to accumulate at the interface [1]. Group 2: Ethernet Signal Transmission - Ethernet cables do not provide power; instead, they rely on separate power adapters, resulting in minimal heat generation during data transmission [2]. - Ethernet uses differential signaling, which enhances its ability to resist interference, allowing for low voltage swings (around ±1V) and requiring very low current (typically a few milliamps), thus generating negligible heat [2]. Group 3: Power over Ethernet (PoE) - PoE technology allows for both power and data transmission over a single cable, but the maximum current is limited to 2A, significantly lower than USB fast charging, resulting in less heat generation [4]. - The article provides a comparison of different PoE standards, indicating that even under maximum load, PoE devices typically only generate mild warmth [4][5].

Core Viewpoint - The story of a Shenzhen Huaqiangbei merchant, A Teng, reflects the challenges faced by millions of merchants in the area, highlighting a battle for survival and rebirth in a competitive market [3]. Group 1: Profit Decline and Market Changes - A Teng's profit margin has plummeted from 20% to around 5%, with a significant reduction in shipment volume [5][4]. - The increasing transparency of prices has led to rapid product obsolescence, requiring constant updates to offerings [5]. - Customers have become more knowledgeable, often dictating product specifications based on their own research [5]. Group 2: Strategies for Recovery - A Teng aims to regain control by actively seeking customers through trade shows, which provide direct access to end clients and better conversion rates [8]. - The shift from being perceived as a trader to a manufacturer is crucial, allowing for price and brand optimization [9]. - A Teng emphasizes the importance of service quality, ensuring timely delivery and product guarantees to retain large-volume clients [9]. Group 3: Upcoming Events and Opportunities - The first "Good Life Expo" will be held from June 27 to 29 in Beijing, aimed at stimulating consumer activity and supporting quality brand growth [11]. - The expo will feature a unique online-offline integration model, connecting quality product/service companies with domestic distribution channels [11].