curt@dtix.ARPA (Curt Welch) (07/29/89)
For several months, we have been using a Bridge LS/1 (CS/1) 64 port TCP/IP terminal server to connect a bank of 48 Bell 212 modems to our local ethernet. We have been seeing a recurring problem with "dead" ports and I would like to know if anybody else has seen this problem, or if they have tried to use a Bridge LS/1 with dial-in modems. What we have found, is that every few weeks, a bank of consecutive ports on the LS/1 will stop working for no apparent reason. When we reboot the LS/1, the problem goes away, but nothing else we have tried seems to clear the condition. Typically, when a port goes "dead", the terminal server holds DTR high, so the modem will answer the phone, but the terminal server never responds with its welcome message and does not echo characters. I've never seen more than 8 (or less than 4) ports go bad at once, and the last bad port in the group has always ended on a multiple of 8. For example, twice now, we have seen ports 2 through 7 (the first port on the server is 0) go bad. Thanks for any help you can give us. Curt Welch curt@dtix.arpa David Taylor Research Center, Bethesda, MD (202) 227-1428