info-vax@ucbvax.ARPA (06/22/85)
From: SYSTEM%CRNLNS.BITNET@WISCVM.ARPA >From: ANDERER <anderer%udel-cc-vax1.delaware@udel-louie.ARPA> >To: info-vax@sri-kl.ARPA >Subject: DHU-11s > >We're looking to replace our 40 DZ-11 remote lines with something a little >more efficient (..on a 780 running VMS). DHU-11s seem to fit the bill. But >before spending the money, is there anything we should know about them that >our salesman might not volunteer? > >Thanks in advance. > I don't know anything about DHU-11 performance, but they cost about $3.5k for 16 lines, so that comes to $10.5K (for 48 lines) less what you would get for your DZs (not much). Plus installation and maintenance. Have you considered moving your DZs to a LAT-11? The throughput and the load on the host Vax of a LAT-11 is comparable to the same number of DMF-32 lines. Of course, the added functionality causes a load increase due to more processes being active per terminal. It would probably be a bit more expensive, but would offload your 780 and would make adding more Vaxes much easier - you wouldn't have to get dedicated terminal lines (or terminals) with the new system(s). You'd have to get an 11/34 with 256kb (unless you already have a Unibus based PDP-11 that you can dedicate to it), 1 or 2 DEUNAs (one for the 780 if it doesn't already have one and one for the 11), a DELNI, and LAT-11 software. That comes to about $12-15k altogether (used prices); maybe $1k less if you used Ethernet cabling and transcievers instead of the DELNI. If you don't have or want full function VMS DECnet (to down-line-load the terminal server: about another $3K), the 11/34 would also have to have a load device -- RX02 or TU58s at about $1k. Plus installation and maintenance. Whatever you decide, be sure to go out for bids: all of the mentioned DEC products are available from multiple distributors whose prices fluctuate in all directions (but usually downward) from day to day. Selden Ball Cornell University, LNS NYNEX: (607) 256-4882 Wilson Synchrotron Lab BITNET: SYSTEM@CRNLNS Dryden Road ARPA: SYSTEM%CRNLNS.BITNET@WISCVM.ARPA Ithaca, NY 14853