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

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).

130 10/100 Managed Hub