Digital Conference System Expansion Module Cable Connection Requirements

Cable Selection for Expansion Modules

The selection of cables for digital conference system expansion modules directly impacts signal transmission quality and system stability. For analog audio signals, shielded cables are essential to minimize electromagnetic interference (EMI). For example, when connecting microphones to expansion modules, cables with a 75-ohm impedance and a 64-wire shielding net are commonly used. These cables feature a hard copper core wrapped in an insulating layer, which is further surrounded by a densely woven conductive shield and an outer protective layer. This structure effectively blocks external interference, ensuring clear audio transmission.

For digital audio signals, unshielded twisted-pair (UTP) cables, such as Category 5e or higher, are preferred. These cables support transmission distances of up to 90 meters without signal degradation, making them suitable for connecting expansion modules to digital audio processors or mixers. When dealing with high-definition video signals, HDMI or DisplayPort shielded cables are recommended. These cables can transmit uncompressed audio and video data with minimal latency, ensuring a seamless viewing experience during conferences.

In scenarios where long-distance transmission is required, optical fiber cables offer significant advantages. They are immune to EMI and can transmit signals over distances exceeding several kilometers without noticeable attenuation. For instance, when connecting expansion modules in large conference centers or multi-building setups, optical fiber cables ensure reliable signal transmission between different floors or buildings.

Connection Methods for Different Expansion Modules

The connection methods for digital conference system expansion modules vary depending on their types and functions. For bus-type expansion modules, such as those used for audio or video distribution, a single cable is typically used to connect the main host to multiple modules. This setup simplifies wiring and reduces installation costs. For example, in a hand-in-hand digital conference system, an 8-core or 10-core shielded cable is used to connect the main host to each microphone unit or expansion module. The cable carries both power and data signals, enabling a daisy-chain connection that supports up to hundreds of units.

For network-based expansion modules, such as those used for remote control or data sharing, Ethernet cables are the primary choice. These modules are connected to the main host via a local area network (LAN), allowing for flexible placement and easy integration with other networked devices. For instance, a network-enabled expansion module can be used to control lighting, curtains, or other environmental factors in the conference room from a central control panel.

In some cases, a combination of different connection methods may be required. For example, a hybrid system might use bus-type cables for local audio distribution and Ethernet cables for remote control and data transmission. This approach provides the best of both worlds, ensuring reliable signal transmission while offering flexibility in system design and expansion.

Key Considerations During Cable Installation

Proper cable installation is crucial for ensuring the optimal performance of digital conference system expansion modules. First, it is essential to avoid physical stress and damage to the cables during installation. Cables should be routed along walls, under floors, or through dedicated cable trays to keep them away from foot traffic and moving parts. Sharp bends or kinks should be avoided, as they can damage the cable’s internal structure and degrade signal quality. For example, the minimum bending radius for multi-core cables should be greater than six times the cable’s outer diameter, while for coaxial cables, it should be greater than 15 times the outer diameter.

Second, cable separation from power lines is vital to prevent electromagnetic interference. Signal cables and power lines should be kept at least 30 centimeters apart when running parallel to each other. If crossovers are unavoidable, they should be made at a 90-degree angle to minimize coupling. Additionally, using shielded cables and proper grounding techniques can further reduce EMI. For instance, the shielding layer of a signal cable should be grounded at one end only to avoid creating ground loops, which can introduce noise into the system.

Finally, labeling and documentation are essential for maintaining and troubleshooting the system. Each cable should be labeled with its purpose, source, and destination to facilitate quick identification during maintenance or upgrades. A detailed wiring diagram should also be created, showing the layout of all cables, expansion modules, and other system components. This documentation will prove invaluable when diagnosing issues or making changes to the system in the future.

Vaxden Audio Technology Co.,Ltd. Is a high-tech enterprise integrating r&d, production and sales. Develop and produce high performance and innovative conference system equipment with international product design concept.

The company’s main products include: wired digital conference system, wireless digital conference system, wireless conference microphone, professional conference microphone, etc.

The company has been adhering to the independent innovation and product differentiation development strategy, the products are independent intellectual property rights, and obtained a number of patents including utility model patents and appearance patents. After years of development, accumulated rich EXPERIENCE in OEM/ODM, adhering to the enterprise spirit of “only to improve the quality of meetings”, force casting high-quality products, and the majority of customers to achieve win-win cooperation, excellence and dreams.Official website address：https://www.vaxden.com/