88CHAPTER 6: SWITCH MONITORING AND MAINTENANCE

Figure 62 Hyper Terminal serial interface attribute settings

Upgrading software XModem is a file transfer protocol used for its simplicity and performance. It through console port transmits files through serial interfaces, supporting 128 bytes and 1Kbytes in data

(XModem) units, checksum and CRC checking modes, and multiple transmissions attempts (usually 10 attempts) when packet errors are found.

XModem completes the transmission by the receiving program (receiver) and the sending program (sender). In XModem, the transmission begins by sending negotiation characters from the receiver for the purpose of check mode negotiation. After passing the negotiation, the sender is allowed to send the first data packet. Upon receiving the complete packet, the receiver checks the packet using the agreed upon check mode and sends an ACK if the packet has passed the check and a NAK if it did not. After receiving the ACK, the sender sends the next packet; if it receives a NAK, the sender retransmits the previously sent packet.

To run the Xmodem application:

1In the Boot menu, type 4, press Enter, and the system accesses the serial interface submenu as follows:

SERIAL SUBMENU

1.Download file to SDRAM through serial interface and boot

2.Download file to Flash through serial interface

3.Download file to HardDisk through serial interface

4.Modify serial interface boot parameter

0.Return to main menu Enter your choice(0-4):4

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3Com 8814, 8807, 8810 manual Serial Submenu

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.