16CHAPTER 1: PRODUCT OVERVIEW

Role and function

The MBUS system is powered by 5 V from the MBUS on the fabric. The 5 V power on the two fabrics are redundant to each other.

Each MBUS module is attached to the MBUS, which contains two control lines:

MBUS0 and MBUS1.

Each card has an independent MBUS module, those on the fabrics are primary

MBUS modules, and those on application modules are secondary MBUS modules.

When the fabrics operate in redundancy mode, the MBUS module on the active fabric is the active module, and the one on the standby fabric is the standby module.

The MBUS uses a controller area network (CAN) bus as its control bus, that uses the 1:1 hot backup and transfers control information at 1 Mbps.

Fan Tray The Switch 8807 uses one 25 W fan tray, which contains four 120 x 120 x 25.4

mm(4.7 x 4.7 x 1.0 in.) axial fan units. The fans can be governed in two modes: fabric-controlled or temperature-controlled. They operate at -48 VDC supplied from the backplane.

The Switch 8810 uses one 35 W fan tray, which contains six 120 x 120 x 25.4

mm(4.7 x 4.7 x 1.0 in.) axial fan units. The fans can be governed in two modes: fabric-controlled or temperature-controlled. They operate at -48 VDC supplied from the backplane.

The Switch 8814 uses two 25 W fan trays, each of which contains four 120 x 120 x 25.4 mm (4.7 x 4.7 x 1.0 in.) axial fan units (and totally eight for the two fan trays). The fans can be governed in two modes: fabric-controlled or temperature-controlled. They operate at -48 VDC supplied from the backplane.

Figure 9 Fan tray panel of the Switch 8800 Family

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3Com 8814, 8807, 8810 manual Role and function, Fan tray panel of the Switch 8800 Family

8810, 8814, 8807 specifications

The 3Com 8814, 8810, and 8807 are renowned products from the networking giant 3Com, which played a significant role in the evolution of networking technology in the early 1990s. These devices were instrumental during a time when organizations were transitioning from traditional communication systems to more sophisticated networking solutions.

The 3Com 8814 is a multi-port networking hub designed for small to medium-sized businesses. One of its main features includes a 10Base-T Ethernet capability, allowing for fast and reliable connectivity among various devices within a local area network (LAN). The 8814 supports up to 14 connections, providing scalability for growing businesses. The hub’s ease of use is notable; it features a plug-and-play design, which aids in quick setup without requiring extensive configuration. This plug-and-play functionality, alongside its robust physical and electrical performance, made the 8814 an appealing choice for organizations looking to enhance their networking infrastructure without significant investment.

Moving on to the 3Com 8810, this device is labeled as an intelligent network switch and ushered in advancements in network management and performance. A critical element of the 8810 is its ability to support both 10/100Base-T Ethernet connections, effectively allowing mixed-speed environments. Its built-in management features, enabled by 3Com's networking technologies, offered users the ability to monitor traffic flow, manage bandwidth allocation, and configure network settings through a user-friendly interface. This switch also incorporated advanced features like VLAN support, increasing security and segmentation within networks, which proved invaluable for sophisticated networking environments.

Lastly, the 3Com 8807 represents a more versatile and high-performance switch option suited for larger networks. This model features a stackable design that allows for a broader range of scalability and redundancy. It supports both fast Ethernet and Gigabit Ethernet, ensuring that organizations can expand their network speeds as needed. The 8807 includes features for enhanced fault tolerance and link aggregation, which bolsters reliability and performance under heavy traffic loads. Its integration with 3Com's Network Management Software provided administrators with unprecedented control over their networks, empowering them to optimize performance and troubleshoot issues effectively.

Overall, the 3Com 8814, 8810, and 8807 exemplified the company's commitment to innovation in networking technology, providing businesses with the tools necessary to develop efficient, scalable, and reliable network infrastructures. Each of these devices played a crucial role in shaping the landscape of networking, emphasizing ease of use, management capabilities, and performance.