| Title: | "ASK THE WIZARDS" |
| Moderator: | QUARK::LIONEL |
| Created: | Mon Oct 30 1995 |
| Last Modified: | Mon May 12 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1857 |
| Total number of notes: | 3728 |
Return-Path: "VMS001::WWW"@vms001.das-x.dec.com Received: by vmsmkt.zko.dec.com (UCX V4.1-12, OpenVMS V6.2 VAX); Wed, 7 May 1997 07:01:08 -0400 Received: from vms001 by mail11.digital.com (8.7.5/UNX 1.5/1.0/WV) id GAA25848; Wed, 7 May 1997 06:59:15 -0400 (EDT) Date: Wed, 7 May 1997 06:03:36 -0400 Message-Id: <[email protected]> From: "VMS001::WWW"@vms001.das-x.dec.com (07-May-1997 0603) To: [email protected], [email protected], [email protected] Subject: Ask the Wizard: '[email protected]' X-VMS-To: [email protected] Remote Host: n02i94.c2r5.pol.co.uk Browser Type: Mozilla/2.0 (compatible; MSIE 3.0; Windows 95) Remote Info: <null> Name: David Atherton Email Address: [email protected] CPU Architecture: VAX Version: V 5.5-2 Questions: I am trying to connect pc to vax using Win95,Pathworks and Decnet. When I physically attach the pc via ethernet network card into the Decnet circuit, (Vax 4100 out to Dechubs and 90TLs), any Vax terminals are logged out and cannot reconnect, until the pc connection is removed, then service is restored. What am i doing wrong. Manuals are totally bereft of any hardware connection details ?? Thanks.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1843.1 | Check Ethernet Wiring | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Mon May 12 1997 15:34 | 40 |
Given your comments, I will assume you are not using "fat" Ethernet
cabling.
It would appear that there is a cable fault or hardware problem that
specifically involves this PC.
There are two common schemes used for most 10 MB Ethernet connections:
ThinWire (coaxial cable with BNC connectors), and Twisted Pair (usually
flat wiring with modular jacks).
With ThinWire, look for a "T" connector and/or terminator that is not
correctly installed. Make sure that each system has a "T", and that
the coax goes "through" the top bar of the "T", and that the vertical
part of the "T" connects to the system. The only places where it is
permissible to connect coax directly to something other than a "T" is
to the 50 ohm terminator, and to the BNC wall jack.
Local ThinWire:
50ohm+-----T-----T------50ohm
| |
NIC NIC
Larger ThinWire:
50ohm+-----T-----T------jack
| |
NIC NIC
50ohm: 50 ohn Ethernet terminator
NIC: Network Interface Card (Ethernet controller)
jack: BNC wall jack for ThinWire (there's normally
sufficient termination elsewhere.)
If twisted pair Ethernet is being used, this points to a configuration
problem, or to a hardware problem specific to this PC connection.
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