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- From: djc@scimitar.unx.sas.com (David J. Cherveny)
- Newsgroups: comp.dcom.servers
- Subject: Re: Looking at Terminal Servers
- Message-ID: <BxuHGw.FrD@unx.sas.com>
- Date: 17 Nov 92 05:19:43 GMT
- References: <1992Nov14.013422.13818@u.washington.edu>
- Sender: news@unx.sas.com (Noter of Newsworthy Events)
- Organization: SAS Institute Inc.
- Lines: 104
- Nntp-Posting-Host: scimitar.unx.sas.com
-
- In article <1992Nov14.013422.13818@u.washington.edu> pollock@u.washington.edu writes:
- >We're currently looking at terminal servers to purchase. Since we will
- >buy only one server at this time, a detailed evauluation with demos, etc.
- >is difficult to justify, so I'm turning to the Net for assistance.
- >
- >We are looking for the following features:
- >
- >1. 16 lines, with limited modem support (DSR/DTR, RTS/CTS - enough to
- > properly handshake and disconnect on a Micom Data PBX.
- >
- >2. Good TCP/IP support, including SLIP now and PPP in the future. LAT
- > support is desirable, but can be a future add-on (if it's an extra
- > cost item, we won't buy it now).
- >
- >3. Preferably, stand-alone operation, not dependent upon a host for
- > more than initial software installation (flash eprom, ROMs, etc).
- > ...
- >
- >Joe Pollock
- >The Evergreen State College
- >pollock@u.washington.edu
- >
- >
-
- We've been using Xyplex 1600's with very good results.
-
-
- 1. Has 16 lines, supports DSR/DTR *AND* RTS/CTS simultaneously. Great for
- high speed ( v.32bs etc ) modems, especially with SLIP. We've connected
- one to our MICOM successfully. A little trickey getting the MICOM
- and XYPLEX wired and configed properly though.
-
- I'm using same terminal server for dial in and dial out using same
- pool of modems. For dial out need to use TELNET protocol, either
- vanilla TELNET or a recent version of C KERMIT that supports TELNET
- protocol. Useful for file xfers from UNIX systems.
-
- 2. TCP/IP support pretty good. SLIP impelmentation is good except doesn't
- support compressed slip ( cslip ) or PPP yet. Soon. LAT support
- included. TN3270 supported too.
-
- 3. 1600 is stand alone, has 1Mb ROM or FLASH card removable from front.
- EZ to upgrade. The card is about the size of a credit card but thicker.
-
- Remote console port, accessable via TELNET, is handy for trouble shooting
- and configuring. MONITOR commands let you repeatedly show the status of
- some system paramiter or port status... handy for watching modem control
- signals turn on/off during connection.
-
- Most problems I've had have been quickely fixed by XYPLEX with a "special"
- OS version Fed Exed to me. Just replace the ROM card and reboot.
-
- For example, had problem when TELNETing to the XYPLEX to access modems.
- TELNET sends a null after a carriage-return. The XYPLEX option to filter
- this didn't do quite do the right thing. Had fixed version in about a week.
-
- I've also had one to fail. Port status lights flash a diagnostic pattern.
- They replaced via Fed Ex next day air.
-
- A new version of 1600 is in new 9000 series rack. Has 20 ports and 68020
- instead of 68000. Serial port speeds up to 115200 vs 38400 for 1600. This
- won't really be a factor until next generation modems become available.
-
- Only a few problems/dislikes:
-
- VMS style commands -
- Either you love 'em or hate 'em. Command history and
- editing makes it tollerable, IMHO. VMS style help system
- too. Does have "UNIX" style aliases.
-
- No compressed slip or ppp support -
- Comming soon I hear.
-
- Date/time -
- No internal time of day clock in 1600. Must down
- load initial date/time from a boot server or a KERBEROS
- server. But since most 1600's are "stand alone" you don't
- normally use a boot host so date/time doesn't carry
- accros reboots. Turns out I'm using KERBEROS anyway
- for username/password authentication so the time bug
- is moot for me.
-
- KERBEROS not for everyone -
- KERBEROS system is OK but overkill for just terminal server
- username/password authentication. Note that the XYPLEX
- only uses KERBEROS to check if username/password is correct...
- the "ticket" gets tossed out... so not usefull in a real
- KERBEROS enviroment.
-
- Manual is big -
- Sometimes too complete. Sys admin section good. Decent
- examples and has sorted reference section with list of commands.
-
- No syslogd support -
- I'd like syslogd support for logging reboots, login fails,
- etc.
-
- Accounting info incomplete -
- Good enough but I'ld like more. SLIP sessions don't get logged.
-
-
-
- David Cherveny djc@unx.sas.com
- Systems Programmer, Networking (919)677-8000x6689
-