HDTenEightyP/NetNews huggingface dataset:
From: kuchan@rtsg.mot.com (Joseph M. Kuchan)
Subject: Re: Need Info on Wireless LANS
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: na
Date: Tue, 1 Sep 1992 13:59:31 GMT

ed@balrog.aecom.yu.edu (Ed Geraghty) writes:


>Greetings, 

>    A while back there was some discussion on wireless LANS. Is there anybody
>that has a summary from that discussion? Basically we have two ethernet 
>segments that we wish to join in two buildings approx.  500-600 feet from
>roof to roof. The buildings are Line of Sight w/o obstruction. Any 
>information about companies or products that would solve this problem would 
>be greatly appreciated. As a research lab in an educational facility cost
>is an important factor. 


>                                Thanx in Advance,

>                                Ed Geraghty


>*******************************************************************************
>Ed Geraghty                         |  "There is no true escape - I am watching 
>Systems Manager                     |   all the time..." - JP "Electric Eye"
>Albert Einstein College of Medicine | 
>Dynamic Brain Imaging Lab           |  "Whenever you dream, you're holding a 
>Bronx, NYC 10461                    |   key. It opens a door to let you be 
>email: geraghty@aecom.yu.edu        |   free" - Ronnie James Dio
>*******************************************************************************Ed, I work for a division of Motorola known as Wireless Enterprise Systems. We
make a product known as Vista Point (tm) that can do the job you're describing.
Since you've included your mailing address, I'll see to it that you receive
literature. I'va also printed your mail and will give a copy of it to a
sales representative who can answer your questions about our products. BTW,
our Vista Point product is very cost effective at $11,500 for the whole setup.
Compare that to other solutions and you'll see what I mean!

-- 
Joe Kuchan,    Motorola - Wireless Enterprise Systems	*
3205 Wilke Road, Arlington Heights, IL 60004		*
kuchan@whitefish.rtsg.mot.com				*
tel: (708) 632-7193	fax: (708) 632-6816		*
Newsgroups: comp.dcom.lans.ethernet,comp.dcom.lans,comp.protocols.tcp-ip
From: bwolfe@rad.rpslmc.edu (Brian A. Wolfe)
Subject: Traffic Visualization tool?
Followup-To: comp.dcom.lans.ethernet
Organization: Rush Presbyterian-St. Lukes Medical Center
Date: Thu, 27 Aug 1992 23:07:32 GMT


Hi there,

I am designing a show network for a certain medical society and I
am trying to find some sort of network traffic analysis package
that can help some very computer illiterate sorts of people 
understand which clients and servers are communicating with 
one another (in real-time, not just a static map).

For example, one way to show this graphically might be to 
depict the network map (I need to show about 50 hosts at once)
with icons representing the hosts, and then draw lines between the 
hosts in real-time that get thicker (and thinner) based on the 
volume of traffic between them. 

I would like to find something that runs on a Sparcstation,
but I am open to using other platforms (as long as I can send the
video to an Electrohome projector).

Thanks in advance for any pointers,

Brian



-------------------------------------------------------------------------
Brian Wolfe						
Associate Director
Dept of Diagnostic Radiology and Nuclear Medicine
Rush Presbyterian-St. Lukes Medical Center 
Chicago,  IL   USA 
Internet: bwolfe@rad.rpslmc.edu    
Voice:    (312)-942-2141          FAX:  (312)-942-2114
From: pat@hprnd.rose.hp.com (Pat Thaler)
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: Re: Fiber speeddir
Date: 31 Aug 92 23:56:01 GMT
Organization: HP Roseville Networks Division


    In article <1992Aug18.181507.14439@picker.com>, SYSNET@engvax.picker.com (Leonard A. Visconti) writes:
    > Does anyone know the speed of a signal through fiber? For example, through
    > thick wire ethernet cable the propagation speed is about 77% of the 
    > speed of light. We are using 62.5/125 multimode fiber at 850 nm. 

    In my work with FDDI, using 62.5/125 multimode fiber at 1350 nm, I use
    3ns/meter as the propagation delay.  

    JEff Russell                jeffry@browncow.austin.ibm.com  OR

Hopefully, you only use 3 ns/meter when you are looking for a rough ball
park figure.  The speed of light in free space is somewhat slower than
that: 3.33 ns/meter.  The propogation of light in a 62.5/125 multimode
fiber can be as slow as 5 ns/m (a velocity of 0.66 * c).

Thin coax is almost the same as fiber: 0.65 * c
10BASE-T is somewhat slower:  0.59 * c 
Newsgroups: comp.dcom.lans.ethernet,comp.dcom.lans
From: vances@xenitec.on.ca (Vance Shipley)
Subject: "Null Modem" AUI cable?
Organization: SwitchView Inc., Waterloo, Ontario
Date: Thu, 03 Sep 1992 01:53:26 GMT


I have been wondering for some time now if I could use the AUI DB-15 connector
on my ethernet cards to connect two machines to each other.  If I make the
appropriate cross overs in the cable would this work?

-- 
Vance Shipley 
vances@xenitec.on.ca   vances@ltg.uucp   ..uunet.ca!xenitec!vances
From: seifert@netcom.com (Rich Seifert)
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: Max Repeaters/multiport repeater wiring questions
Date: 28 Aug 92 23:58:25 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

In article <1992Aug21.172813.1606@ra.royalroads.ca>, bbaskett@post.RoyalRoads.ca (Bill Baskett) writes:
> 
> 1) I find conflicting information (mostly from salespersons) about 
>    how many repeaters I can have in my network. One source says
>    2 another says 3 and yet another says 4. Which is correct?
>

Assuming that you are talking about coax Ethernets (not 10BaseT, where
the hub is a large, multiport repeater) the rule is effectively 2
repeaters between any pair of stations. The reason for the confusion 
is the way that 802.3 defines a repeater. When a remote repeater is
used with an inter-repeater link, that is counted as two repeaters.
So this allows two local repeaters, or two remote repeaters (which is
where the 4 repeater max rule is derived).
 
> 2) Is a repeater effectively two transceivers? If so, then do
>    the thin to fiber converters (one at each end of fiber) count
>    as one repeater?
>

A repeater is a fairly complex finite state machine, and not just two
transceivers back-to-back. There is a complete decoding and re-encoding
of the signal, plus an "elastic" buffer, and a whole host of 
preale-generation and collision-extension  states that are accounted
for.
A thin-wire to fiber converter may or may not be a repeater, depending on
the way in which it is implemented. A multiport transceiver (e.g., DEC
DELNI) is NOT a repeater.
 
> 4) Can a transceiver be plugged directly into the workstation, or
>    is there some reason that you must use the tranceiver cable?
>

There is no reason not to plug a transceiver directly into a workstation,
other than possible mechanical interference in the back of the
workstation. 
 
> 5) Are thinnet segments supposed to be grounded somewhere?
> 

Yes. Thin-wire ethernets (like all coax ethernet) should be grounded
at one, and ONLY one point on the cable.

-- 
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: holemans@reks.uia.ac.be (Wim Holemans)
Subject: archive site ?
Organization: U.I.A.
X-Newsreader: Tin 1.1 PL5
Date: Mon, 31 Aug 1992 06:47:19 GMT

Is there somewhere a site that archives the contents of the comp.dcom.lans.*
groups and makes it available for anon ftp ?

Thanks,

W. Holemans
System/network manager
U.I.A.
holemans@reks.uia.ac.be
Newsgroups: comp.dcom.lans.ethernet,comp.dcom.lans.misc,comp.protocols.novell
From: leonard@qiclab.scn.rain.com (Leonard Erickson)
Subject: Re: 802.3 Non-Compliance (?)
Reply-To: 70465.203@compuserve.com
Organization: SCN Research/Qic Laboratories of Tigard, Oregon.
Date: Tue, 1 Sep 1992 18:48:19 GMT

aboyd@quantum.on.ca (Andrew Boyd) writes:

>In article <1992Aug28.194558.4752@iplmail.orl.mmc.com> more@tcc.orl.mmc.com 
>writes:
>>In this meeting (which unfortunately I wasn't in), the vendor made the statement
>>that Netware Servers violate the 802.3. His statement was that when a netware
>>server detects a collision, that rather than following the random backoff, 
>>in the Ethernet world, the Netware server immediately attempts to retransmit
>>the collided packet(after sending the jam sequence).

>The only option is to _increase_ the backoff (ie be nice).

>I think the salesman is, um, suffering from a credibility problem.  If I 
>were you I would contact national and novell for more information.

Q: What's the difference between a used-car salesman and a computer 
   salesman?

A: The used-car salesman *knows* when he's lying.

-- 
Leonard Erickson		      leonard@qiclab.scn.rain.com
CIS: [70465,203]			 70465.203@compuserve.com
FIDO:   1:105/51	 Leonard.Erickson@f51.n105.z1.fidonet.org
(The CIS & Fido addresses are preferred)
Newsgroups: comp.dcom.lans.ethernet
From: slater@tpocc.gsfc.nasa.gov (Don Slater)
Subject: Re: Null Modem on EtherNet
Organization: Computer Sciences Corporation
Date: Tue, 1 Sep 1992 01:15:27 GMT

I recently purchased a couple of 10base2 transceivers for use with hosts
which only have AUI ports.  They were around $70 each.  So with the cost
of a piece of coax, two 'tee's, and a couple of terminators added in, you're
set to go for about $200, without giving up any expandability.

Don Slater
Integral Systems, Inc
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: Null Modem on EtherNet
From: Andy.Linton@comp.vuw.ac.nz (Andy Linton)
Date: Mon, 31 Aug 1992 03:17:51 GMT
Organization: Dept of Comp Science, Victoria Uni, Wellington, NEW ZEALAND


In article <79671@yarra.pyramid.com.au>, erik@yarra.pyramid.com.au (Erik Lecis) writes:
|> In article <Bttn2o.7zr@comp.vuw.ac.nz>, Andy.Linton@comp.vuw.ac.nz (Andy Linton) writes:
|> > 
|> > I've just looked in the New Zealand catalogue for this device and it costs more
|> > than buying a couple of 10BaseT transceivers, attaching them to the AUI ports
|> > and making up a 10BaseT crossover cable. Your mileage may vary!
|> 
|> Hey? The Australian Black Box catalogue lists vanilla ethernet transceivers
|> at $399, whilst 2-Port direct connect transceivers are $490 and 4-Port models
|> are $731. NZ prices are bound to be higher, but the relative cost should be
|> still the same.
|> 
|> ANC retail a 2-Port version for about half the price.
|> 

I can buy a 10BaseT transceiver for $130 (not from Black Box). So I can do the
whole thing for under $300 including a crossover 10BaseT cable.

The n-Port direct connect transceivers are $555 and $895 which at an exchange
rate of 1.3 is *cheaper* than the Australian price. I'll also need two AUI
cables costing at least $50 each. Total around $650.

The cheaper ANC comes close until you add in the AUI cables. Apart from the
cost I'd prefer to have devices I can use elsewhere in my network if
circumstances change.
Newsgroups: comp.dcom.lans.ethernet
From: daveh@ucla-an.UUCP (Dave Hammond)
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: Max Repeaters/multiport repeater wiring questions
Date: 30 Aug 92 14:47:10 GMT
Reply-To: daveh@ucla-an.UUCP (Dave Hammond)
Organization: Anesthesia Dept., Sch. of Medicine, UCLA, Los Angeles

In article <c8dnaah.seifert@netcom.com> seifert@netcom.com (Rich Seifert) writes:
>> 5) Are thinnet segments supposed to be grounded somewhere?
>
>Yes. Thin-wire ethernets (like all coax ethernet) should be grounded
>at one, and ONLY one point on the cable.
>

This is an embarrasingly simple question, but, how do I ground my
thin-wire ethernet?

--
Dave Hammond
daveh@anes.ucla.edu
Newsgroups: comp.dcom.lans.ethernet
From: rpw3@rigden.wpd.sgi.com (Rob Warnock)
Subject: Re: Ethernet boards for PC's
Organization: Silicon Graphics, Inc.  Mountain View, CA
Date: Tue, 1 Sep 1992 06:50:29 GMT

yates@gaia.cs.umass.edu (David Yates) writes:
+---------------
|   Also, I understand that you can buy a block of 2**24 Ethernet
| addresses from the IEEE standards office for $1000.  Do they also
| handle the manufacturer IDs that go in the Ethernet type field?
+---------------

Uh, the "manufacturer ID" is what you're getting with the block of 2**24
Ethernet addresses. The "manufacturer ID" (or OUI -- Organizationally
Unique Identifier) assigned by the IEEE forms the first 24 bits (well,
the 22 bits after the "group" and "local/global" bits) of the 48-bit
Ethernet address, and you, as a manufacturer, supply the lower 24 bits
in a guaranteed-unique fashion.

OUI's and addresses have nothing to do with type fields. The last time
I checked, Xerox was still the registry for Ethernet types, not the IEEE.
(Has that changed? Anybody?)  RFC 1060 says:

   If you need an Ethernet type, contact the Xerox Corporation, Xerox
   Systems Institute, 475 Oakmead Parkway, Sunnyvale, CA 94086, Attn:
   Ms. Fonda Pallone, (408) 737-4652.

+---------------
| Is there an additional fee for a registered Ethernet type field?
+---------------

Yes, but I don't remeber how much. The numbers $300 or $500 come to mind.


-Rob

-----
Rob Warnock, MS-9U/510		rpw3@sgi.com
Silicon Graphics, Inc.		(415)390-1673
2011 N. Shoreline Blvd.
Mountain View, CA  94043
From: seifert@netcom.com (Rich Seifert)
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: AUI-AUI cable
Summary: Not really...
Date: 28 Aug 92 23:45:41 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

In article <1992Aug21.114509.27193@ccu1.aukuni.ac.nz>, graeme@ccu1.aukuni.ac.nz ( Graeme Moffat) writes:
> Is it possible to connect two (15 pin female) AUI connectors?
> eg a repeater to an ethernet card.  It seems sensible to cross the data
> in/out & control in/out pairs, and not to connect the power pins at all, but
> will this work?  I realise that AUI connectors are intended for transceivers.
> 
Not really, the way you describe.
The female DB-15 on a repeater is normally used to connect to a transcevier
(e.g., on a backbone network). Female AUIs are used on station-like
devices (a repeater is a station-like device in this sense). Males
are used on transceiver-like devices. You cannot connect two
stations together through the AUI (except for a special case
of a two-station-only network without collision detect!).


-- 
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"
From: seifert@netcom.com (Rich Seifert)
Newsgroups: comp.dcom.lans.ethernet
Subject: Re: Ethernet CRC/Alignment errors
Keywords: ethernet CRC errors
Date: 29 Aug 92 00:14:37 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

In article <1992Aug21.041709.3208@usage.csd.unsw.OZ.AU>, pwb@newt.phys.unsw.edu.au (Paul W. Brooks esq.) writes:
> I have a piece of the campus ethernet that seems to have an excessive
> number of CRC/Alignment errors. I have a Novell LANalyzer, and over an
> hour or so reports no late collisions, no illegal long/short packets,
> but a rate of CRC/Alignemtn errors sometimes up to 1 per 1000 packets.
> These errors become more numerous when the traffic exceeds about 7% of
> the ethernet bandwidth. To help in tracking down the source, could
> someone tell me whether these errors are propagated through repeaters -
> if not, that narrows the source to somewhere on this segment, which
> would help a lot!. Also, are they the sort of thing to start panicing
> about? Is 1 per 1000 or 1 per 5000 excessive at 10% utilyzation?
> 

Unfortunately, repeaters do not check the CRC of received packets,
and simply pass them through. (By the time the CRC comes by, the packet
is through anyway!). 

I would consider one CRC error per 1000 packets a SERIOUS problem.
On a properly configured Ethernet, at 10% sustained load (24 hour
period) and 256 byte (average) packets, in a 10^^-9 BER
(the specified worst-case), there should
be approximately 3.7 CRC errors every hour. That's about  one CRC error
per one-half million packets!
-- 
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"
Xref: sparky comp.dcom.lans.ethernet:1743 comp.dcom.lans.misc:689
From: jrd@cc.usu.edu
Newsgroups: comp.dcom.lans.ethernet,comp.dcom.lans.misc
Subject: Re: 802.3 Non-Compliance (?)
Date: 28 Aug 92 17:49:13 MDT
Organization: Utah State University

In article <1992Aug28.194558.4752@iplmail.orl.mmc.com>, more@tcc.orl.mmc.com () writes:
> 
> 
> We had a vendor come in to discuss performance issues relative to our
> client server development and production environment. The server being Unix
> based, the client desktop being MS-WINDOWS 386 devices. We are running TCP/IP
> between them.
> 
> In this meeting (which unfortunately I wasn't in), the vendor made the statement
> that Netware Servers violate the 802.3. His statement was that when a netware
> server detects a collision, that rather than following the random backoff, 
> in the Ethernet world, the Netware server immediately attempts to retransmit
> the collided packet(after sending the jam sequence). This vendor stated that
> because of this, TCP/IP based systems running on the same ethernet as Novell
> netware servers could experience some performance problems due to the 
> noncompliant nature of the netware server. He further stated that for this
> reason, NASA has put a ban on Novell Netware at it's sites. 
> 
> I personally feel that this is mostly a bunch of BS. I'm an open systems kinda
> guy, but I find it hard to believe that Novell would flagrantly violate the
> rules of engagement in CSMA/CD.
> 
> Anyhow, does anyone have any information which could either verify or dispute
> this assertion about Netware servers, or, the NASA ban on them.
> 
> 
> -- 
> 
>   Duane N. More
>   EMAIL: more@tcc.orl.mmc.com
>   (407) 356-6504
> 
>   Martin Marietta 
>   PO 628007  MP-1269
>   Orlando, FL. 32862-8007
--------------
	It's interesting hearing the lengths (mixed metaphor) to which folks
go to prove a point they don't want understood. What the distinguished vendor
should have said was old-style Novell 802.3 frames, now referred to as
"raw Ethernet", do not obey the current rules from the IEEE 802.3 committee.
The deviation is in the data field of the frame where DSAP and SSAP reside
for 802.2 interiors. This problem was inherited (read, swiped) from 3Com
back in the days when the IEEE 802.3 committee was still pondering things.
Times change, and so the normal recommendation is for Novell systems to
abandon frame kind Ethernet_802.3 in favor of Ethernet_II (DIX) or ~_SNAP.
	So far as I am aware NW board drivers do NOT reprogram the board
to modify the exponential backoff algorithm. The vendors usually accused
of this are Sun and or SGI; proof is not in my hands. Some common sense ought 
to prevail here: if NW servers did no-wait back to back sends just whose
machines are being clobbered, and does one think that PC clients can stand
up to that packet rate? Goodness, the conventional Sun/SGI/DEC/whatnot
high performance workstations already beat PC Ethernet boards into the
ground while following the rules.
	Now if that d.v. shows up again you can have a good roasted missionary
for lunch.
        Joe D.
Newsgroups: comp.dcom.lans.ethernet
From: aazobian@athena.mit.edu (Assef A Zobian)
Subject: Saber LAA Starter Kit software 
Organization: Massachusetts Institute of Technology
Date: Sun, 30 Aug 1992 01:40:20 GMT


I have a brand new Saber LAA Starter Kit software . This software supports Nodell,
Microsoft, DEC, Bayan,IBM and any MS-NET based network. It has LAA Console/RT and the 
Saber LAA agent Toolkit. The LAA Agent Toolkit performs the following functions:
1- Application control and inventory
2- Hardware inventory
3- Event logging
4- File auditing
5- Schduler
6- Disk monitor
Its retail price is $ 1195 but I am willing to sell it for much less. If you need it,
e-mail me and we will fix the price.

 
Newsgroups: comp.dcom.lans.ethernet
From: gary@sci34hub.sci.com (Gary Heston)
Subject: Re: Programmer Specs for SMC Elite Boards(WD)
Reply-To: gary@sci34hub.sci.com (Gary Heston)
Organization: SCI Systems, Inc., Huntsville, Al.
Distribution: na
Date: Thu, 27 Aug 1992 16:29:03 GMT

In article <1047@alsys1.aecom.yu.edu> ed@balrog.aecom.yu.edu (Ed Geraghty) writes:

>     I am writing a program that catches certain packets off the net. I would 
>like to get the programmers specs for the western digitial chipset on SMC Elite
>ethernet cards. Would anybody have a phone number I could call to order it. 

Fax a description of your efforts to Tan Tran at 1-714-707-2460, and he'll
send you a set of documentation. Include your name and companys' name.
(Worked for us....)


-- 
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.
    The most dangerous person in the world is Jessica Fletcher.
        Everywhere she goes, people die.
Newsgroups: comp.dcom.lans.ethernet
From: rkd@pt.com (Ray Downes)
Subject: Laptop Ethernet adaptors for use with PC-NFS
Organization: Performance Technologies, Incorporated
Distribution: usa
Date: Mon, 31 Aug 1992 19:19:48 GMT

I will likely have a need to interface a Laptop to an existing PC-NFS
(revision 4.0a) "network", and was thinking of using one of the pocket
adaptors (parallel port <-> 10baseT), via likely a NDIS driver. Anyone
know of a source for these (hopefully that you seen work)? I've seen a
Black box one (which seems about 2X "normal cost"), and one by Xircom.
-- 
Ray Downes, Performance Technologies Incorporated		rkd@pt.com
315 Science Parkway, Rochester, New York 14620		  
Voice - (716) 256-0200, FAX (716) 256-0791
From: ed@balrog.aecom.yu.edu (Ed Geraghty)
Newsgroups: comp.dcom.lans.ethernet
Subject: Need Info on Wireless LANS
Date: 26 Aug 92 21:24:50 GMT
Distribution: na
Organization: Albert Einstein College of Medicine -- Dynamic Brain Imaging Lab


Greetings, 

    A while back there was some discussion on wireless LANS. Is there anybody
that has a summary from that discussion? Basically we have two ethernet 
segments that we wish to join in two buildings approx.  500-600 feet from
roof to roof. The buildings are Line of Sight w/o obstruction. Any 
information about companies or products that would solve this problem would 
be greatly appreciated. As a research lab in an educational facility cost
is an important factor. 


                                Thanx in Advance,

                                Ed Geraghty


*******************************************************************************
Ed Geraghty                         |  "There is no true escape - I am watching 
Systems Manager                     |   all the time..." - JP "Electric Eye"
Albert Einstein College of Medicine | 
Dynamic Brain Imaging Lab           |  "Whenever you dream, you're holding a 
Bronx, NYC 10461                    |   key. It opens a door to let you be 
email: geraghty@aecom.yu.edu        |   free" - Ronnie James Dio
*******************************************************************************
Newsgroups: comp.dcom.lans.ethernet
From: daves@james.carleton.ca (Dave Sutherland)
Subject: Re: Traffic Visualization tool?
Organization: Carleton University
Date: Mon, 31 Aug 1992 16:15:53 GMT

In <1992Aug27.230732.7020@rpslmc.edu> bwolfe@rad.rpslmc.edu (Brian A. Wolfe) writes:

>For example, one way to show this graphically might be to 
>depict the network map (I need to show about 50 hosts at once)
>with icons representing the hosts, and then draw lines between the 
>hosts in real-time that get thicker (and thinner) based on the 
>volume of traffic between them. 

I believe Silicon Graphics has this exact approach to network traffic
visualization.