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).
