HDTenEightyP/NetNews huggingface dataset:
From: Mehrtens_T@msm.cdx.mot.com
Subject: Re: Acceptable collision rate?
Organization: Motorola_Codex
Distribution: usa
Date: Fri, 13 Nov 1992 16:07:43 GMT

Steve McDowell writes:
>acceptable level ... collision rate is in ethernet networks.

I normally like to see collision rates average around 2% for a nominally used
ethernet network, containing one router and 20 to 35 nodes, with average
loading under 10% and peak loading not exceeding 50%.  Digital Equipment
informed me, quite some time ago, that the network will become troublesome when
your average collision rate exceeds 10% over the course of time.  I tend to
agree with DEC.  As a matter of fact, I think DEC's rules are occasionally too
lax.  I attempt to keep all ethernet segments 20% under the cable length rule,
and I try by best to use only  1  (yes, ONE)  repeater between nodes.  More
efficient, you know...

Collision rate is a factor of many things, the most important one being  Tada! 
How long is your repeated ethernet network?  If your thin ethernet cables are
500 feet long, 10Base-T cables are 320 ft, and there are multiple repeaters in
remote closets, starred off a main repeater, you can conceivably have 35% peak
loading with 20% collision rate, complaining users, and only have a couple
dozen machines!  Sorry - I'm getting into network design, and your question
asked about collisions......

Collisions are a factor of several items
1) quantity of nodes
2) network design / layout
3) network peak and average loading
4) type of traffic (bursty, steady-stream, terminal emulation, mixed)
5) Horsepower of nodes' network interface (how much can the node generate)


It is relaxing to know that my network segments can exceed 75% peak loading at
times, and the users continue to operate without data loss.  Now, that's
6-sigma for you!

Tom Mehrtens  <Mehrtens_T@msm.cdx.mot.com>  Insert disclaimer here

If you want a rainbow,
you have to be willing
to put up with a little rain.
Newsgroups: comp.dcom.lans.ethernet
From: ukjent@eiklh (Ukjent person)
Subject: Access to Internet between to Ethernet segments
Organization: eiklh
Date: Thu, 5 Nov 1992 09:33:49 GMT

Odd Gunnar Dalen 	(128.39.248.21)
supervisor
Eik highschool of education
Tnsberg, Norway

Hi out there, this is my first try on this one.

My problem is that we run a novell 3.11 server with 2 ethernet segments. 
On segment #2 there is also a Unix-computer that is connected to Uninett/
Internett. I don't get access to the Unix from segment #1. We use packet 
drivers and telnet, nupop, gopher etc.
From: ctoomey@ccvax.ucd.ie
Newsgroups: comp.dcom.lans.ethernet
Subject: Late Collisions (Exsqueeze me?)
Date: 12 Nov 92 02:24:37 GMT
Organization: University College Dublin

We have a smallish LAN here, based around a NetWare 3.11 fileserver, and about
12 or so client PCs, running (unusually :) Ethernet over thix-coax [All sing,
`Oh, 10Base2, We Love You!.']

I was taking a look at some of the statistics from the device driver for the
NIC (Novell/Anthem BustMastering NE2100) in the fileserver, using the `MONITOR'
console utility.

Anyhow, I noticed the following statistic:

TxLateCollisions:	67

Now, said filserver has been up since last reboot for 2 days, and I'm
wondering:

A)	What exactly is a late collision [I've seen this discussed here before,
	but never paid attention - definitley another one for the mythical
	FAQ]?

B)	How serious is this count; am I looking at a sick Ethernet
	installation, and if so, what's to look for?

Thank you in advance,

	- Colm Toomey -
Xref: sparky comp.dcom.lans.ethernet:2479 misc.forsale.computers:40205
From: mark@coombs.anu.edu.au (Mark)
Newsgroups: comp.dcom.lans.ethernet,misc.forsale.computers
Subject: Re: Converter from RJ45 to BNC (make that AUI!)
Date: 14 Nov 92 02:56:37 GMT
Organization: Australian National University
NNTP-Posting-Host: 150.203.76.2
Organisation: Wassat?!

dave@major.panix.com (Dave O'Shea) writes:
>aem@symbiosis.ahp.com (a.e.mossberg) writes:

>> A _BALUN_ is all you need to go from RJ45 to BNC. Black Box has
>> them for about $45, and I have no doubt some other vendor has them
>> for perhaps as low as $25.

>That's not going to work for 10baseT. 3Com did use a system like that which
>they sold under the name "pairtamer". It worked, but 10baseT xcvrs are
>actually cheaper than these passive glorified baluns. 10baseT uses separate
>pairs for TX and RX - whereas 3com was using only one pair, so you could use a
>balun.

I have approx 16 of the 3Com pairtamers if anyone is interested. Going cheap.
Drop me a line.

Mark
mark@coombs.anu.edu.au
From: ctoomey@ccvax.ucd.ie
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: FAQ: Or would be, if there was one : -D
Date: 7 Nov 92 06:18:18 GMT
Organization: University College Dublin

Thanks to all who replied to my question about minimum distance between nodes
under 10Base2 specs...

I got a number of replies via this group and via Email indicating that the 
official spec. is for 0.5M between nodes.  Vernon Schryver from SGI points out
that in my case (a small number of hosts on a small segment) I can actually use
smaller lengths of cable.  I'll probably go for 0.5M cables, as we can always
use them somewhere else if needs be - I knew about the 10Base5 spacing rules
[it's a bit hard to miss those red-on-yellow bands], and was just hoping that
the distance would be smaller under cheapernet...

Thanks again, everyone..

	- Colm Toomey -
Newsgroups: comp.dcom.lans.ethernet
From: rich@grebyn.com (Richard Lawrence)
Subject: Re: Secure Ethernet? --> ScaNet?
Organization: Grebyn Timesharing
Date: Mon, 9 Nov 1992 04:17:26 GMT

In article <1992Nov6.130821.823@uts.uni-c.dk> dacobb@uts.uni-c.dk (Bent Bagger) writes:
>
>protocol(s). On cold restart, a small program stored in PROM
>sends out a boot request using either RARP/BOOTP/TFTP or a
>ScaNet boot protocol. The boot request is answered by a BOOTP
 ^^^^^^^^^^^^^^^^^^^^

Do you know if this is directed or broadcast? ie, will it cross routers
without bootp helper?
-- 
Rich Lawrence, Synoptics Systems Engineer  DOD#9630  rich@grebyn.com
     '92 Seca II "Yuri"  CI$:71101,2272  GEnie:R.LAWRENCE14
   216 years ago my government gave me certain inalienable rights.
     Since then, they've been trying to correct their mistake.
Newsgroups: comp.dcom.lans.ethernet
Subject: LANtastic and TCP/IP
From: mark@comp.vuw.ac.nz (Mark Davies)
Date: Wed, 11 Nov 1992 23:50:09 GMT
Organization: Dept. of Comp. Sci., Victoria Uni. of Wellington, New Zealand.


Hi,
  Can someone tell me what is required to have LANtastic and a TCP/IP stack on
the same PC?

cheers
mark
Newsgroups: comp.dcom.lans.ethernet
From: jeffb@world.std.com (Jeffrey T Berntsen)
Subject: Connect 10Base-T <-> LattisNet: What's the best way?
Organization: The World @ Software Tool & Die
Date: Thu, 5 Nov 1992 16:46:32 GMT

I have an existing LattisNet network and want to attach 10Base-T devices
to it.  I know the two are similar but not directly compatible.  What is
the best way to:

  Attach a single 10Base-T device into an existing LattisNet?

  Add 10Base-T capability to the network ( >1 device )?

  Replace the LattisNet with 10Base-T (I assume it would involve changing
  most of the network hardware but not the cabling..)?

Any and all advice would be greatly welcome.  Email or Post replies (I don't
mind either, but would prefer you post.)

Jeff Berntsen
jeffb@world.std.com

Newsgroups: comp.dcom.lans.ethernet
From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
Subject: Re: FAQ: Or would be, if there was one : -D
Organization: Silicon Graphics, Inc.  Mountain View, CA
Date: Sun, 8 Nov 1992 05:16:40 GMT

In article <1992Nov7.061818.49847@ccvax.ucd.ie>, ctoomey@ccvax.ucd.ie writes:
> ....
>                                          Vernon Schryver from SGI points out
>that in my case (a small number of hosts on a small segment) I can actually use
> smaller lengths of cable....


Are you sure that wasn't someone else?  Maybe Rob Warnock?

Believe it or not, I sometimes keep quiet about things I'm not sure
about and am too lazy to look up.

Personally, I wouldn't violate the rules.  Cable is too cheap compared
to the future costs of figuring out and fixing things should the small
network gradually become not so small and just as gradually not so
useful.


vjs
Newsgroups: comp.dcom.lans.ethernet
From: st1r8@elroy.uh.edu (Guillot, Burt J.)
Subject: Are the 3C501 cards any good?
News-Software: VAX/VMS VNEWS 1.41    
Organization: University of Houston
Date: Mon, 9 Nov 1992 21:46:00 GMT

I recently bought two 3C501 cards for $35/each recently.  I am using them
with Netware Lite and they seem to run okay, although a bit slow.  The
docs claim they can go 10 megabit/second, yet, when I run Norton's Network
performance test, I only get around 22-40K/sec rating (I believe).  My
uncle has some 1 megabit/second card and he gets around the same rate.
Shouldn't I be able to get ten times what he gets?

For the price, they seem to perform well, I just thought they'd be a
little faster.  They are 8-bit cards running on a 286/8 and a 8088 that
has a 286/8 express card in it.

I might consider buying a few more at the same price in the future, but
I wanted to know if there are any other cards around the same price that
could do better ... Basically, what I'm asking is ... is the 3C501 network
card good or bad ... why or why not?

If I want to add computers to my little network later, do I have to
use 3C501 cards, or can I use any other cards that allow BNC cabling?
Newsgroups: comp.dcom.lans.ethernet
From: seifert@netcom.com (Rich Seifert)
Subject: Re: Connecting a Sun to thin ethernet?
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Thu, 12 Nov 1992 20:50:08 GMT

In article <1992Nov9.135238.27451@spectrum.xerox.com>, hdavies@rx.xerox.com (Hugh J.E. Davies) writes:
> 
> ---
> How can I connect a Sun workstation to a thin ethernet? I need to allow my Sun to talk to my PC, with mimimal expenditure. I was going to use a 3COM 3C501 card in the PC, configured for thin ethernet. I have scrounged a transceiver for the Sun, and I was > just going unsolder the vampire tap and either solder in a BNC socket, or just solder the cable directly into the transceiver. Would this work?
> 

I would just buy an external, AUI-to-thinEthernet transceiver. It will
be more reliable over the long haul.

However, soldering a BNC connector to what used to be a vampire
tap will actually work. I wouldn't push the limits of the number of
stations on a segment however, since the capacitance is likely
to be somewhat higher than a properly designed transcevier.



-- 
Rich Seifert                    Networks and Communications Consulting
seifert@netcom.com              (408) 996-0922
                                (408) 996-2860 FAX
"... specialists in Local Area Networks and Data Communications systems"
Newsgroups: comp.dcom.lans.ethernet
From: gary@sci34hub.sci.com (Gary Heston)
Subject: Re: Converter from RJ45 to BNC  (make that AUI!)
Reply-To: gary@sci34hub.sci.com (Gary Heston)
Organization: SCI Systems, Inc., Huntsville, Al.
Date: Thu, 5 Nov 1992 21:07:43 GMT

In article <1992Nov4.161705.29581@umbc3.umbc.edu> themos@umbc5.umbc.edu (Mr. Themos Pentakalos; ADMIN-COMP) writes:

>So, once again.... Is there a device that converts from RJ45 to
>AUI right on the back of the card? Black Box has one for $140.00
>dollars and someone mentioned a company called St. Clair. Any more
>ideas?

If there will be groups of computers, get one of the converters for
each group, plug it into the RJ45 jack, and run coax between the 
computers. If anyone objects, offer them the opportunity to buy
new network cards for you.....

Before I'd spend $140 per system to buy converters, I'd buy new
cards. Allied Telesis has a new series out starting at $79.95 for 
the 10BaseT version, $99.95 for the 10BaseT/10Base2 version, and
$299 for the 10BaseT/FOIRL version. Call at 1-800-424-4284...
I'm sure they also have the repeaters for much less than Black Box.


-- 
Gary Heston    SCI Systems, Inc.  gary@sci34hub.sci.com   site admin
The Chairman of the Board and the CFO speak for SCI. I'm neither.
"...I looked out my window, and saw Kyle Pettys' car upside down, then I
thought 'One of us is in real trouble'." Davey Allison, re: a 150MPH crash 
Newsgroups: comp.dcom.lans.ethernet
From: eebr3@fel.tno.nl (Robert Been)
Subject: NetBIOS
Keywords: NetBIOS
Organization: TNO Physics and Electronics Laboratory
Date: Wed, 11 Nov 1992 15:37:17 GMT


I developed a (realtime) multi-user networkapplication which is based on 
NetBIOS. To use NetBIOS I developed a toolbox which is implemented in Turbo
PASCAL version 6. NetBIOS is used entirely in nowait-mode and the toolbox allows me to transfer mail and files acros an Ethernet-PC network. An automatic
login- and logout-system creates sessions between stations. 
However...
sometimes NetBIOS suffers from crashes which I cannot control. So I have a 
few questions maybe you could answer!:
- When a station crashes, NetBIOS remains 'active' at the station. How can I
  avoid interference of this station at other stations?
- I use NetBIOS-version 3.02c. Is this the latest version?
- Does disc-access (harddisc) influence the correct working of NetBIOS?
- Do nested interrupts occure while using NetBIOS?

Some related questions:
- Is it possible to highload NetBIOS?
- Does 'Inline($FA)' and 'Inline($FB)' in TP6.0 really disable and enable
  interrupts? Particularly with respect to disable interrupts of NetBIOS!  
- The toolbox I spoke about is implemented in Turbo PASCAL 6.0. Could this
  cause some of the problems?
- Are there ANY good manuals of NetBIOS?

Thanks for reading it!! 
-- 

Pee Wee Herman, that's my name! Don't wear it out!

Newsgroups: comp.dcom.lans.ethernet
From: seifert@netcom.com (Rich Seifert)
Subject: Re: MAC address manufacturer ID list?
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Thu, 12 Nov 1992 20:26:18 GMT

In article <1992Nov05.181913.9705@src4src.linet.org>, redsonja@src4src.linet.org (Red Sonja) writes:
> 
> Please excuse me if this is a FAQ. I am looking for a list, if one
> exists, of the first three fields of an ethernet MAC address and the
> corresponding manufacturers. If there is one floating around the net,
> or someone who knows who to talk to at the IEEE about getting a current list,
> please send email or post.
> 

Vendors who have received address blocks from IEEE/ISO have been 
guaranteed anonymity up to this time. There is no "official" list of
who has which assignments, or even who has an assignment at all. There
is a general desire on the part of users and network administrators to
get such a list. The IEEE has sent a letter to every address block
owner asking if they are willing to have their name and block assignment
made public. There should be a list forthcoming (a few months in the future)
of those vendors that respond affirmatively. In the future, address
blocks will be public knowledge unless a vendor wishes and requests
anonymity.

This was discussed in detail at the IEEE 802 meeting earlier this
week in San Diego.


-- 
Rich Seifert                    Networks and Communications Consulting
seifert@netcom.com              (408) 996-0922
                                (408) 996-2860 FAX
"... specialists in Local Area Networks and Data Communications systems"
Newsgroups: comp.dcom.lans.ethernet
From: Andy.Linton@comp.vuw.ac.nz (Andy Linton)
Subject: Re: Converter from RJ45 to BNC (make that AUI!)
Organization: Computer Science, Victoria University, Wellington, NEW ZEALAND
Date: Thu, 5 Nov 1992 21:18:04 GMT
Distribution: na


In article <1db79pINNm3f@symbi1.symbiosis.ahp.com>, aem@symbiosis.ahp.com (a.e.mossberg) writes:
|> 
|> Err.. whoops. <blush> The product I mentioned, a balun, will not do the
|> job. It is, as someone was kind enough to mention via email, for running
|> thinnet over twisted pair, not converting to 10baset. For that, you do
|> indeed need a repeater.  Someone else did mention in an article that
|> a cheap 10baseT transceiver is made you could connect in to the AUI port.

No one seems to have bothered to mention that as well as the 10BaseT
transceivers at the host end you're going to need a 10BaseT repeater to
connect the 10BaseT connections to your existing network at the other end of
these cables. We pay around $500 for a twelve port unit - we use one from Asante.
Newsgroups: comp.dcom.lans.ethernet
From: rohrernl@helix.nih.gov (Nathan Rohrer)
Subject: What do you think of 3com's ELNK III?
Keywords: 3Com NIC ELNKIII
Organization: National Eye Institute, National Institutes of Health
Distribution: usa
Date: Mon, 9 Nov 1992 21:11:42 GMT

Are they really that much faster than previous 3Com cards?  Has anyone 
experienced major problems with them?  We're thinking about upgrading all 
our cards.  Thanks.



/*********************************************************************/
/*                       --- Nathan Rohrer ---                       */
/*  NATIONAL EYE INSTITUTE, OFFICE OF SCIENCE POLICY AND LEGISLATION */
/*              MANAGEMENT INFORMATION SYSTEMS SECTION               */
/* BITNET: NLR@NIHNEI31                  BETHESDA, MD 20892-0031     */
/* INTERNET: rohrernl@helix.nih.gov      NIH 3Com: NLR:NEI31:NIH     */
/* CompuServe: 70670,3164                PHONE: 301 496-2194         */
/*********************************************************************/
Newsgroups: comp.dcom.lans.ethernet
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Late Collisions (Exsqueeze me?)
Date: Fri, 13 Nov 1992 17:49:55 GMT
Organization: U of Toronto Zoology

In article <1992Nov12.022438.49889@ccvax.ucd.ie> ctoomey@ccvax.ucd.ie writes:
>A)	What exactly is a late collision ...

It's legitimate for collisions to occur early in a packet, because there
is a finite delay before other hosts see the start of the packet, and they
might have started transmitting their own packet meanwhile.  However, it's
essential that all hosts agree whether a particular packet experienced
a collision or not, which is why Ethernet has a maximum end-to-end length
and a minimum packet size.  For a packet larger than the minimum, after a
certain point in the transmission everyone on the network should be aware
that a transmission is in progress, and should defer to it.  A late collision
is one that occurs after this consensus should have been reached.  It means
something's wrong, either a sick host or a misconfigured network.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: comp.dcom.lans.ethernet
From: adyer@pagine.com (Andrew Dyer)
Subject: Re: Ethernet chips
Keywords: ehternet 802.3 design
Organization: Pagine Corporation, San Jose, CA
Date: Fri, 13 Nov 1992 19:04:34 GMT


Just make sure you get the errata sheet, er book from National or AMD.
-- 
Andrew Dyer - Pagine Corp. - 1961-A Concourse Dr.  San Jose, CA 95131
Zippy says: 
Isn't this my STOP?!
Newsgroups: comp.dcom.lans.ethernet
From: fdl@cbnewsh.cb.att.com (f.d.la rocca)
Subject: Token Ring Port Chip
Organization: AT&T
Date: Mon, 9 Nov 1992 02:24:37 GMT
Keywords: MAU


The implementation of most token ring hub MAUs today are typically
passive. However, companies like Synoptics are beginning to offer
active retimed token ring hubs. The chips used today by most hub vendors
are proprietary and not available to the industry. The question for this
newsgroup is do any of you know of any major or minor silicon vendors that 
have made or will make available to the industry an 
active retimed token port chip? Seems to me
that a real interesting device would be a multi port active retimed
token port chip. Wouldn't it make for an innovative offering. 
(Consider what repeaters did for Ethernet Hubs) I believe that
most active MAUs today are implemented with at best one port chip per
port. Consider what an active retimed multi port token port chip
would do for cost reducing future MAUs. What gives
silicon vendors? Why are you not jumping on this?

Frank LaRocca
AT&T/NCR


Newsgroups: comp.dcom.lans.ethernet
From: mcdowell@exlogcorp.exlog.com (Steve McDowell)
Subject: Acceptable collision rate?
Organization: EXLOG, Inc.
Date: Thu, 12 Nov 92 00:55:23 GMT

I'm looking for common wisdom on what an "acceptable" or "normal"
collision rate is in ethernet networks. Is it under 10 percent of
all packets? Is it 40 percent? Should the acceptable level vary
with the number of machines on the segment? 

If you can, expound upon why you offer the number you do. 

Thanks in advance.

-- 
Steve McDowell             . . . . o o o o o 		Opinions are 
Exlog, Inc.	                  _____      o     	mine, not my 
mcdowell@exlog.com      _____====  ]OO|_n_n__][.    	employers..
		       [_________]_|__|________)<   
Newsgroups: comp.dcom.lans.ethernet
From: st1r8@elroy.uh.edu (Guillot, Burt J.)
Subject: Re: Are the 3C501 cards any good?
News-Software: VAX/VMS VNEWS 1.41    
Organization: University of Houston
Date: Wed, 11 Nov 1992 19:16:00 GMT

In article <1992Nov11.022926.7193@grebyn.com>, rich@grebyn.com (Richard Lawrence) writes...
>>performance test, I only get around 22-40K/sec rating (I believe).  My
>>uncle has some 1 megabit/second card and he gets around the same rate.
>>Shouldn't I be able to get ten times what he gets?

>Absolutely not. Keep in mind the following:
>2) Netware Lite is not what you use during performance benchmarks.

I used Norton Utilities "System Info" program and ran the option for
Network Performance.  (This was running under Netware Lite though).

>It's interesting that your uncle has a card that is rated at
>1mbit/second. That either means that there was a misprint in the
>literature or somebody was unusually honest. It would be nice if
>ethernet devices were supplied with sustained transfer rate information,
>but it's not a nice world. :-(. Many cards that claim to signal at X bps
>were rated that way by sending 1 packet and then multiplying out - not a
>real world situation.

My uncle bought three cards in a package called "ReadyNet".  It has
strang cabling and piece-of-junk software, but it still works.  He
had to upgrade to a different software to use it with DOS 5.0.  The
old company changed to Actrix systems and he bought the software
package called PC NOS/Plus.

The company sells 1 megabit/second cards and 4 megabit/second cards.  I
believe they told me they call them "Transporter cards".  The cards he
has now all went out at one time and I had to replace some chips on them,
but they seem to be working now.
Newsgroups: comp.dcom.lans.ethernet
From: sandyb@world.std.com (Sandy Bendremer)
Subject: Where is United Networks, Inc. - Need ODI
Summary: Need to find United Networks for ODI Driver
Keywords: United Networks where ODI
Organization: AnyWare Associates -- Boston, MA
Date: Thu, 5 Nov 1992 23:03:18 GMT

Any one know how to find United Networks, Inc.?  We have several of their
Turbo Ethernet/16 boards and we would like to get copies of the ODI drivers
for use with Novell NetWare Lite.

Any help in finding them or the drivers (called T16.COM & T16.INS) would
be appreciated!

Thanks,

Sandy

-----------------------------------------------------------------------------
    Sandy Bendremer      |     AnyWare Associates    |   TEL: 617-522-8102
                         |      32 Woodland Road     |
 sandyb@world.std.com    |      Boston, MA 02130     |   FAX: 617-522-5734
-----------------------------------------------------------------------------
Newsgroups: comp.dcom.lans.ethernet,comp.protocols.tcp-ip.ibmpc
From: wlin@magnus.acs.ohio-state.edu (Weihung Lin)
Subject: LOOKING FOR SPECIAL ETHERNET BOARD OR SINGLE BOARD COMPUTER
Summary: realtime data transfer using socket driver
Keywords: tcp/ip, ethernet, socket driver
Organization: The Ohio State University
Date: Thu, 5 Nov 1992 20:03:59 GMT


     I am looking for a special PC ethernet board or PC connectable single
board computer (if there is such board) which will serve as a dedicated 
TCP or UDP socket driver device so that it will do the data transferring 
without using any PC's CPU time.

     Thanks for any help.

Weihung Lin
Newsgroups: comp.dcom.lans.ethernet