3Com MSR 50 Series Configuration Manual page 813

Terminal Access Troubleshooting 813
The terminal cannot display the login interface after configuration and no
error message is logged on the Unix server
Check the configuration file to see whether the same application mode is
configured on the router and the Unix server. This problem occurs if the Unix
server uses the many-to-one mode and the router uses one-to-one mode.
The terminal connected to a credit card (IC card) swipe reader does not
work
Check the hardware versions of the interface modules using the display version
command.
First, check the hardware versions of the interface modules. 8AS modules have
two hardware versions: 1.x and 2.x. 8AS modules with a hardware version of 1.x
do not support card swiping and those with a hardware version of 2.x do. No such
problems happen to any other interface modules.