Troubleshooting the Network

Q:The local-console ‘login screen’ does not come up sometimes when a terminal (PC running terminal emulation) is connected to already

booted master hub. Why?

A:The screen must be refreshed, when the 10/100 Managed Hub is running and the terminal emulator is started. Pressing Ctrl + R refreshes the screen and the login menu appears.

Q: Users of the 100Mbps segment cannot use Web-Based Management, however 10Mbps segment users can. Why?

A:The SNMP agent, TCP/IP stack and the Web engine are implemented on the 10Mbps bus of the master hub. Therefore the 10Mbps segment must be used for Web-Based Management in the absence of a switch module.

Q:Even though the switch module with internal bridging has been installed, the 10Mbps segments can’t communicate with the 100Mbps segments. Why?

A:The switching function is disabled by default in the software, there- fore even though the internal function is enabled with the on board jumpers, 10Mbps and 100Mbps segments cannot communicate. The internal switch must be enabled using local console management through connections from the RS-232 port on the hub to a serial port on a PC. Select Device Control from the main menu and then 2/3 port bridge module control/status. Enable the internal switch.

Q:With regards to the 10/100 Managed Hub modules: Users will need to use Web or Console management to enable the module, however,

what if users only have a client model in their LAN and want to install a LH8100C-2TX as an internal switch or have a LH8100C-3TX as both internal and external, or have another client model in the stack and one LH8100C-2TX as an external switching port?

A:In the case of LH8112A-S only (whether single or multiple stacked), the switch module will function straightaway when installed. The mode (“internal” or/and “external”) can be set on the module PCB using the jumpers provided. When the master hub is present, we need to additionally enable the module’s function in the management software (through Local Console or Web-Based Management/SNMP Management).

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Black Box LH8124A, LH8112A-S manual Troubleshooting the Network, 130 10/100 Managed Hub

LH8112A, LH8112A-S, LH8124A specifications

The Black Box LH8112A, LH8124A, and LH8112A-S are advanced KVM (Keyboard, Video, Mouse) switch solutions designed for users who require seamless control over multiple computers or servers from a single console. These models are particularly beneficial in environments such as data centers, server farms, and high-performance computing operations where efficient management of multiple systems is essential.

One of the main features of these KVM switches is their ability to support multiple video resolutions, ensuring high-quality display output. The LH8112A and LH8112A-S models can handle video resolutions of up to 1920x1200 at 60Hz, providing sharp images and smooth performance for applications that require detailed visual fidelity. The LH8124A takes this a step further by supporting an even higher resolution, making it suitable for graphic-intensive tasks and multi-monitor setups.

The switches also come equipped with advanced switching technology, allowing users to quickly and effortlessly toggle between connected devices. Users can switch control using either the intuitive front panel buttons or keyboard hotkeys, enhancing user experience and productivity. This flexibility helps in reducing downtime and streamlining operations in busy environments.

In terms of connectivity, the Black Box LH8112A series supports both USB and PS/2 interfaces, accommodating a wide range of peripherals. This versatility ensures compatibility with various systems, including legacy devices and more modern hardware setups. Moreover, the KVM switches offer daisy-chaining capability, allowing users to expand their control setup and manage up to 256 computers using a single-console solution.

Security is another key consideration, and these models include features like password protection and user access controls, ensuring that only authorized personnel can switch between systems. Additionally, the devices are designed for high reliability, featuring a rugged construction that minimizes downtime and maximizes operational efficiency.

In summary, the Black Box LH8112A, LH8124A, and LH8112A-S KVM switches are powerful tools for anyone needing to manage multiple computers effectively. With high-resolution video support, versatile connectivity, user-friendly operation, and secure access features, these switches are indispensable for enhancing productivity and ensuring seamless management of IT resources.