How do I prevent data overrun errors when using a high speed modem on an EPORTS card at 19.2K baud or higher?
The EPORTS board can easily handle 38.4K baud on an otherwise unloaded system, provided Hardware Flow Control is enabled. The hard part is keeping HFC enabled. Several solutions to this problem exist, but one that seems to work is (1) to have a daemon set HFC on open lines periodically, and (2) have uugetty enable HFC on all logins. Some people have found the 1.2 version of the EPORTS driver to be buggy, and that 1.3 allows for significantly higher throughput. Elliot Dierksen submitted two solutions to this problem. Each one addresses the problem in two different ways. The first one enables HFC when a user logs in a HFC capable serial port. The second one is a daemon spawned by init(1) that periodically enables HFC on specified serial lines. From: elliot@oau.
