Larry_J_Osterman@cup.portal.com (10/25/87)
Does anyone know of a 9600 baud asynchronous dialup modem usable with VMS asynchronous dynamic DECnet? We are trying to use a pair of FASTCOMM 9600 modems to do this. We can make a connection to the remote machine by doing a SET HOST/DTE, and dialing using the Hayes-compatible dialing commands. We then login without a problem, but when we do the SET TERM /SWITCH=DECNET /PROTOCOL=DDCMP, the DECnet link refuses to come up. There are no error messages, indicating we've properly got dynswitch installed, virtual terminal support enabled, terminals set to disconnect, etc. NCP says there are no verification errors, meaning our passwords are set up OK. However, SHOW LINE COUNTERS shows "initialization" errors. The number of these errors increases as time goes by. The FASTCOMM uses a CRC-based error correction scheme at its 4800, 7200, and 9600 baud speeds. The scheme is called "Ensured Data Integrity", and is compatible with some CCITT X.* recommendation. DEC's Colorado CSC points out that the DECnet-VAX 4.4 SPD states that asynchronous DECnet is not supported when there is a data switch, terminal server, etc. in the connection. Though error- correcting modems are not mentioned, the support person said that DECnet developers have encountered problems using them. The support person also said that he has fielded a number of calls from users who were having trouble establishing asynchronous DECnet connections through multiplexors. Can anybody shed any light on this? Larry Osterman GTE Telecom, Incorporated Suite 1717 One Tampa City Center Tampa, Florida 33607 (813) 222-5713