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Posting-date: 17 Aug 1992 14:28:00 -0500 (EST)
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Date:         Mon, 17 Aug 1992 13:28:00 -0500
              <CDROMLAN@IDBSU.BITNET>
From:         Linda.Newman@UC.EDU
Subject:      RE: cabling
X-To:         CDROMLAN%IDBSU.BITNET%EXTERNAL@PMDF.UC.EDU

In response to this question, recently posted:

   "Now I know we will go with 10baseT configuration.  It seems much more
    reliable then others.  But now my another question is how do I connect
    my 2 servers (file@optical) and my 4 CD-ROM towers in this configuration.
    I understand that I will use unshielded twisted pair cable with RJ45
    connectors.  Every workstation will be connected - cable from the
    network card to the hub.  How do I connect the hub with my servers
    and towers.  If anyone can give me some hints how I would do that
    that would be great.   Krystyna"

We use CBIS CD-ROM Servers on a 10baseT twisted pair Ethernet Novell
LAN.  Each CBIS server is a separate CPU, like the Novell File
Server, and from the point of view of the topology (cabling &
ethernet cards) the File Servers and CD-ROM Servers are each
connected in the same way as a workstation.

That is, for each, you need an Ethernet card, a twisted pair path
to the Hub (this could be a twisted pair cable going to a wall jack
which is in turn connected to a phone closet where the hub resides),
and a port on the Hub.  Each device, including the servers, is a
'node' on the topology, with the Hub being a center of a 'star'
configuration.

My site also uses Cabletron MRXI hubs, although there are certainly
other vendors to look at.  We have two CBIS 21 drive CD-ROM servers.
We did use Ethernet Cards in the two CD-ROM servers and the File Server
with a larger buffer (64K instead of 16K) than the Ethernet Cards put
in workstations.  Our Ethernet cards are also from Cabletron, although
there are again many sources to choose from, I believe.

[FYI Cabletron does have an 'autobus sensing' card that will work in
8 or 16 bit (XT or AT bus) slots, yet still gives the advantage of a
16 bit card in a 16 bit slot.  They have two ports on them -- we
specify Twisted Pair and Thinnet, as some of our libraries use Thinnet.]

Our main library CD-ROM LAN is connected to our campus Ethernet
backbone.  In our case we connected from the Hub to the backbone,
rather than connecting from the Novell File Server to the backbone, but
it can be done either way, depending on your needs (do you want to
run TCPIP on a workstation without running IPX at the same time for
example?), and campus/institution bridging requirements.

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  | Linda Newman               |    BITNET: LNEWMAN@UCBEH            |
  | University of Cincinnati   |  INTERNET: LNEWMAN@UCBEH.SAN.UC.EDU |
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