HDTenEightyP/NetNews huggingface dataset:
From: seifert@netcom.com (Rich Seifert)
Subject: Re: Definitions
Organization: Networks & Communications Consulting
Date: Wed, 6 Jan 1993 22:52:32 GMT

In article <matt-060193151719@wardmac2.med.yale.edu>, matt@wardsgi.med.yale.edu (Matt Healy) writes:
> 
> Here's how I understand the terms; corrections requested:
> 
> repeater: operates only at level of physical media; allows
> a total length greater than maximum for one segment and
> provides fault isolation.  All traffic goes out to all
> segments.  Some, such as ours, have lights for traffic
> and fault monitoring.
>

Correct.
 
> bridge: like repeater it operates at physical level;
> adds ability to isolate local traffic by checking
> Ethernet source and destination addresses and won't
> pass it on if both are in same segment.  For instance,
> we have a bridge between our lab net and the rest of
> campus so our heavy image processing traffic won't
> flood the campus spine.
>

No, a bridge operates at the MAC (Data Link Layer). This should be 
apparent, since you properly note that the bridge can filter traffic
by looking at the MAC layer addresses.

One minor point: Only the destination address is checked to determine
forwarding. The frame is forwarded unless the bridge knows that the
destination is reachable through the same port that the frame came in on.
 
> router: works at the protocol level (TCP/IP, Novell,
> AppleTalk, or whatever) and intelligently directs
> packets on to their destinations in an interconnected
> network.  Our Apple router connects LocalTalk and Ethernet
> cabling, for example.
>

There isn't really a "protocol" level. Routers operate at the Network
layer (e.g., IP is a Network Layer protocol). But your understanding
is basically correct.
 
> gateway: works at a still higher level so it can translate
> data between different protocols so that, say, Macs, Vaxes,
> and PCs can exchange data.
>

Fundamentally correct. 


-- 
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: fenton@iron.hq.aflc.af.mil (George I. Fenton)
Subject: Re: Thinwire specs/problem?
Organization: U.S. Air Force Security Assistance Center (AFSAC)
Date: Mon, 11 Jan 1993 00:27:11 GMT


mju@mudos.ann-arbor.mi.us (Marc Unangst) writes:
>characteristic impedence, 50 ohms.  The only (electrical) difference
>is that RG-8 has lower attenuation at 10MHz, which allows a longer
>Ethernet segment length by reducing signal loss.  What kind of
>"tranceiver" did you have in mind for going between 10Base2 and
>10Base5?  Some sort of repeater?

1.  My mistake.  I meant attenuation, not resistence ... I sit corrected.
2.  A thicknet transceiver would be required to tap into the 10Base5 cable.
    You can then put a 10Base2 repeater and have an AUI cable attach between
    the 10Base5 and 10Base2.  I'm sure there are a single port thin-net
    repeater with a builtin transceiver to tap into the thicknet.

>Huh?  The coax shield on a 10Base2 network should only have one ground
>connection, and doesn't *need* any.  Most PC cards I've seen have a
>plastic insulator between the BNC connector and the card bracket, to
>prevent the shield from being grounded at the PC.
Yes, there is a plastic shield, but it has been my experience (particular
in old PCs) that the T-connectors can sometimes touch the metal chassis.
If the PC does not have a properly grounded outlet, the PC will find a
ground and if the T-connector is touching the chassis, the 10Base2 cable
becomes the ground for the PC.

10Base2 does not need any ground by itself, but if a 10Base5 is used as a
backbone, then one end of the 10Base5 has to be grounded (based on my
observations in 4 manufacturing sites). --GIF


Xref: sparky comp.dcom.lans.misc:1094 comp.dcom.modems:19214
Newsgroups: comp.dcom.lans.misc,comp.dcom.modems
Subject: Data Intensive WAN - Need Recommendations
From: andyb@wndrsvr.la.ca.us (Andy Brager)
Date: Sun, 10 Jan 1993 00:22:03 GMT
Organization: Wonder Server - Public Access for SoCal


I posted this before, but possibly it got lost somewhere as I've
received no responses.  I've also expanded the newsgroup coverage.


I need recommendations for a WAN.  The WAN will have a star topology,
as there will be one central site, and many (currently 3 envisioned
but more to be added) remote sites.  The remote sites may have a
small (3 user?) LAN.  The central site will probably have a larger
LAN, type unknown, quite possibly Novell.  

The amount of data involved is enormous.  On the order of 500MB
every 20 minutes or so.  I believe it will not be a steady stream
of data, but a 500MB chunk every so often.  This may or may not
already take compression into account.  Currently, 10 minutes or
so to get the data from the remote sites to the central sites is
acceptable, however this may change in the future.  Eventually
real-time may be required.  The remote sites will most likely
have the data coming from a HP 9000 HP/UX system.

Currently there is no equipment, no cable, no building (as far as 
I know there is no building).  My main question is, what hardware
is needed at each end to support this WAN?  In addition, what
facility and service would be best?  My back of the envelope
calculations say that T1 would take 45 minutes, T3 would be 
90 seconds.  Is there a dial-up T3 option?  Are there other
facilities that would work for this?  What sort of bandwidth
can one get using a VSAT and spread spectrum (if that is a bad
question, how fast can 500MB be transmitted)?

One or two of the sites may be geographically close (a few miles?), 
but most will eventually be quite far.  Do I need to worry about the
local phone company, or do I only have to deal with a long
distance carrier?  What other questions should I have asked?  
What information did I leave out?  Thanks in advance!!

-  Andy
-- 
           DO NOT BUY TOUCHE COMPUTERS -email for details
     Large Packages (10K+ Total) to: cerritos.edu!swc!wndrsvr!andyb
   -I don't know but I been told; two sides to every story - Joe Walsh
[    This Space For Rent - No children, pets, or toxic waste dumps please.     ]
Newsgroups: comp.dcom.lans.misc
From: markc@netcom.com (Mark Conover)
Subject: Re: How to get a SCSI->Ethernet - Interface?
Keywords: SCSI, Ethernet, LAN
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Fri, 8 Jan 1993 19:27:14 GMT


I have in my paws a sales brochure I received from Adaptec in 
Nov 1988 describing a SCSI to Lan (ethernet)box
they called the "NODEM".       I kind of recall a lot
of advertisements of the device, and then a quiet
cancellation.

If interested, they are in Milpitas, California, USA
 408 945 8600
-- 

###############   Mark D Conover    ################################
>>>>>>>>>>  DIgital Systems Design  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> > > > > and World Exploration     > > > > > > > > > > > >>  > >  >
			in Real life    markc@netcom.com
			Cupertino, California USA
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Newsgroups: comp.dcom.lans.misc
From: bender@renfield.uucp (Craig Bender)
Subject: wireless LAN supplier
Organization: Seattle Silicon Corporation, Bellevue, WA
Distribution: usa
Date: Tue, 5 Jan 1993 18:38:42 GMT

Could someone provide the telephone number or address of
  PROXIM  Corporation

I'm interested in their `RangeLAN' wireless network but so far
have been unable to locate the manufacturer.

Thanks.
================================================================
From: leonard@telcom.arizona.edu (Aaron Leonard)
Newsgroups: comp.dcom.lans.misc
Subject: Re: Wireless LANs
Date: 8 Jan 93 22:12:08 GMT
Reply-To: Leonard@Arizona.EDU
Distribution: world,local
Organization: University of Arizona Telecommunications

In article <meR3wB1w165w@cybernet.cse.fau.edu>, tbenham@cybernet.cse.fau.edu (Tom Benham) writes:

| 
| I read a review in PC Magazine that said NCR's WaveLan can go
| upto 5 miles with roof mounted antenna.  Are there any other
| products that can do the same or better and don't require a
| license to operate them?  I need to go just slight over 5 miles
| and I definietly want to bypass Ma.  Thanks.
| 
| Tom Benham

Your best bet might be the ARLAN 620 bridges from Telesystems.
They need no FCC license and are supposed to be able to transmit
over a line of sight path of up to 6 miles.  They yield a speed of
something like 200-700Kbps FDX (though their brochures misleadingly
describe them as delivering 400Kbps-1.4Mbps HDX.)

We have a pair of them working over a 1.5 mile path with no problems
at all.  The whole shebang (2 bridges, antenna cables, antennae) should
run you around ten grand.

(Vendor list follows.)

Aaron

Aaron Leonard (AL104), <Leonard@Arizona.EDU>
University of Arizona Network Operations, Tucson AZ 85721
  "It's not a bug, it's a form of flow control."
  - Jerry Leichter on why crash-prone Unix is a suitable
    platform for NSFNET core routers

---

Suggested vendors:

Data Systems Sales
1615 Broadway Suite 210
Oakland CA 94612
1 714 974 6544
Ken Kaminishi

South Hills Datacomm
760 Beechnut Drive
Pittsburgh PA 15205
1 800 245 6215
From: jhl@egr.msu.edu (John Lawitzke)
Newsgroups: comp.dcom.lans.misc
Subject: STP TR Pin Outs
Date: 4 Jan 93 19:57:17 GMT
Organization: Michigan State University, College of Engineering
NNTP-Posting-Host: frith.egr.msu.edu

Is there a standard which defines the pin out functionality of the DB9
connector used for shielded twisted pair Token Ring? If yes, where do I
obtain it?

I understand that pins 1 and 9 are the receive pair and pins 5 and 6
are the transmit pairs.  However, varying on whose card you look at the
remaining pins are sometimes grounded, sometimes hooked to +5V, and
sometimes left hanging.

Hence, I need to know the standard. Advance thanx,
-- 
John Lawitzke
Manager of Product Management
Dale Computer Corp.
Internet: jhl@frith.egr.msu.edu
From: tbenham@cybernet.cse.fau.edu (Tom Benham)
Newsgroups: comp.dcom.lans.misc
Subject: Wireless LANs
Date: 8 Jan 93 20:14:21 GMT
Organization: Cybernet BBS, Boca Raton, Florida

I read a review in PC Magazine that said NCR's WaveLan can go
upto 5 miles with roof mounted antenna.  Are there any other
products that can do the same or better and don't require a
license to operate them?  I need to go just slight over 5 miles
and I definietly want to bypass Ma.  Thanks.

Tom Benham
Newsgroups: comp.dcom.lans.misc
From: petri@ibr.cs.tu-bs.de (Stefan Petri)
Subject: Questions on standard IEEE 802.3
Originator: petri@diana.ibr.cs.tu-bs.de
Reply-To: petri@ibr.cs.tu-bs.de (Stefan Petri)
Organization: TU Braunschweig, Informatik (Bueltenweg), Germany
Date: Tue, 5 Jan 1993 15:36:25 GMT

What is the reason for permitting only three coax segments on the
maximum transmission path between any two stations instead of five?
This question arises because the end-to-end propagation delay of a
link segment should be less than 2570ns instead of the end-to-end
propagation delay of a coax segment of 2165ns (10Base5).

The IEEE 802.3 standard reads in section  8.6.1 (5) as follows:
   The maximum transmission path permitted between any two stations
   is five segments, four repeater sets (including optional AUIs),
   two MAUs, and two AUIs. Of the five segments a maximum of three
   may be coax segments; the remainder are link segments.

   The maximum transmission path consists of: 5 segments, 4 repeater
   sets (with AUIs), 2 MAUs, and 2 AUIs. The total number of
   segments equals the number of link segments plus the number of
   coax segments.  If there are two link segments on the
   transmission path, there may be a maximum of three coax segments
   on that path. If there are no link segments on a transmission
   path, there may be a maximum of three coax segments on that path
   given current repeater technology.

Does the term `current repeater technology' mean that a delay caused
by an inter repeater link (IRL) is negligible compared to the delay
of a repeater set between two coax segments?

Any help is much appreciated. If possible, please answer via E-Mail.

Stefan
Newsgroups: comp.dcom.lans.misc
From: bdboyle@erenj.com (Bryan D. Boyle)
Subject: Re: How to get a SCSI->Ethernet - Interface?
Keywords: SCSI, Ethernet, LAN
Reply-To: bdboyle@erenj.com (Bryan D. Boyle)
Organization: Exxon Research & Engineering
Date: Wed, 6 Jan 1993 17:40:11 GMT


In article <1993Jan6.140448.23934@rhrk.uni-kl.de>, weber@rhrk.uni-kl.de (Christoph Weber-Fahr [KIT]) writes:
>pkr@messua.informatik.rwth-aachen.de (Peter Krueger) writes:

>> some time ago I read about a converter between SCSI and ethernet.
>> Unfortunately, I cannot remember, where I read this article. Since I am
>> *now* desparetly in need of such a device, I was wondering, if anybody
>> knew, where to find these, how much I would be charged per device and,
>> if there is any decent technical documentation...
>I hate to be so stupid, but what would this device do?  SCSI is
>a disk (and other peripherals) controller.  Are you looking for
>an Ethernet adapter that connects to the SCSI?  I never heard
>of anything like this.  What gets converted?

Well, SCSI is an I/O device like others, too. Such "converters" are 
occasionally found on Macintosh systems, since the early Macs were
closed systems without the opportunity to build in extensions like
network interface cards.

Have a look at some Mac-oriented magazines...

Actually Cabletron sells a SCSI to twisted pair ethernet adapter.  Uses
the standard large db connector, with an RJ45 output for use in a TP
lan environment.




--
\   Bryan D. Boyle            \           _         ______ |
 \  Senior Engineer            \        /   \___-=0`/|0`/__|
  \ Exxon Research & Engineering\_______   N7068W  / | /    )
  / 908 730-3338                /        `/-==__ _/__|/__=-|
 /  bdboyle@erenj.com          /         *             \ | |
/ #include <std.disclaimer>   /                        (o)
Xref: sparky comp.dcom.lans.misc:1097 comp.sys.ibm.pc.hardware:35673
From: peters@bsc.guild.org (Peter Sleggs)
Newsgroups: comp.dcom.lans.misc,comp.sys.ibm.pc.hardware
Subject: Info on a PureData 516 Ethernet card requested.
Date: Sat, 09 Jan 93 21:50:32 EST
Organization: Bellatrix Systems Corp., Mississauga, ONT Canada

Anybody know anything about the Puredata 516 ethernet card ?

I've been offered a couple but I have no info on it at all, what I'd
like to know is if its compatible with any of the more common cards and
if its any good.

Thanks
peter
[ email or post - email is faster to get here ]

--
Bellatrix Systems Corp. Mississauga, Ontario Canada
peters@beltrix.guild.org or beltrix!peters
From: richard_kogut@brown.edu (Richard M. Kogut)
Newsgroups: comp.dcom.lans.misc
Subject: Re: How to get a SCSI->Ethernet - Interface?
Date: 6 Jan 1993 17:49:26 GMT
Organization: Brown University Computing & Information Services
NNTP-Posting-Host: rich_kogut.cis.brown.edu
Keywords: SCSI, Ethernet, LAN


Asante makes an Ethernet<-->SCSI device for MacIntoshes. You'd need to write 
a driver for the SCSI adapter unless you are indeed hooking up to a 
MacIntosh.
Richard M. Kogut,   Manager, Systems Services
                    Brown University Computing & Information Services
From: tbenham@cybernet.cse.fau.edu (Tom Benham)
Newsgroups: comp.dcom.lans.misc
Subject: Re: How to get a SCSI->Ethernet - Interface?
Keywords: SCSI, Ethernet, LAN
Date: 6 Jan 93 03:52:10 GMT
Organization: Cybernet BBS, Boca Raton, Florida

pkr@messua.informatik.rwth-aachen.de (Peter Krueger) writes:

> Hi,
> 
> some time ago I read about a converter between SCSI and ethernet.
> Unfortunately, I cannot remember, where I read this article. Since I am
> *now* desparetly in need of such a device, I was wondering, if anybody
> knew, where to find these, how much I would be charged per device and,
> if there is any decent technical documentation...
I hate to be so stupid, but what would this device do?  SCSI is
a disk (and other peripherals) controller.  Are you looking for
an Ethernet adapter that connects to the SCSI?  I never heard
of anything like this.  What gets converted?

Tom Benham
From: nelson@crynwr.com (Russell Nelson)
Newsgroups: comp.dcom.lans.misc
Subject: wireless LAN supplier 
Distribution: world
Date: Sat, 09 Jan 93 03:49:55 GMT
Organization: Crynwr Software

In article <1993Jan5.183842.11419@renfield.uucp> bender@renfield.uucp writes:

   Could someone provide the telephone number or address of
     PROXIM  Corporation

   I'm interested in their `RangeLAN' wireless network but so far
   have been unable to locate the manufacturer.

Proxim, Inc.
295 North Bernardo Ave
Mountain View, CA 94043
800-229-1630
415-960-1630
415-964-5181 FAX

-russ <nelson@crynwr.com> What canst *thou* say?
Crynwr Software           Crynwr Software sells packet driver support.
11 Grant St.              315-268-1925 Voice  |  LPF member - ask me about
Potsdam, NY 13676         315-268-9201 FAX    |  the harm software patents do.
Newsgroups: comp.dcom.lans.misc
From: news@pwh.uucp (news administrator)
Subject: learning about networks and tcp-ip
Organization: PWH Associates
Date: Sun, 10 Jan 93 00:20:52 GMT
Keywords: tcp-ip, nfs, pc-nfs, ethernet, lans, networks


Hi. I need to learn about networks to make myself
more attractive to employers.
Therefore, I have decided to install a simple network in my
home, consisting of a unix system running sco unix v3.2.4, tcp-ip
nfs and ethernet, and 2 dos systems running pc-nfs.
The question is:
is this a good way to get hands on experience with networking?
if so, is this a reasonable network to learn on?
Where do I get pc-nfs and tcp-ip for dos?
What do i need in the way of hardware, boards, cables, tee's, and 
terminators?
what is a good supplier of the necessary hardware?

I have done sys admin for 6 years, but the company where i worked didn't
have any networks. it was on an amdahl running uts.
I am currently unemployed and all companies i have contacted, seem to want
network experience.
thanks for any help.
Phil

Newsgroups: comp.dcom.lans.misc
From: weber@rhrk.uni-kl.de (Christoph Weber-Fahr [KIT])
Subject: Re: How to get a SCSI->Ethernet - Interface?
Keywords: SCSI, Ethernet, LAN
Organization: University of Kaiserslautern, Germany
Date: Wed, 6 Jan 1993 14:04:48 GMT

tbenham@cybernet.cse.fau.edu (Tom Benham) writes:
>pkr@messua.informatik.rwth-aachen.de (Peter Krueger) writes:

>> some time ago I read about a converter between SCSI and ethernet.
>> Unfortunately, I cannot remember, where I read this article. Since I am
>> *now* desparetly in need of such a device, I was wondering, if anybody
>> knew, where to find these, how much I would be charged per device and,
>> if there is any decent technical documentation...
>I hate to be so stupid, but what would this device do?  SCSI is
>a disk (and other peripherals) controller.  Are you looking for
>an Ethernet adapter that connects to the SCSI?  I never heard
>of anything like this.  What gets converted?

Well, SCSI is an I/O device like others, too. Such "converters" are 
occasionally found on Macintosh systems, since the early Macs were
closed systems without the opportunity to build in extensions like
network interface cards.

Have a look at some Mac-oriented magazines...

Regards

Christoph Weber-Fahr

-- 
  Christoph Weber-Fahr                  |  E-Mail:  weber@rhrk.uni-kl.de 
  Universitaet Kaiserslautern,  KIT     |  S-Mail:  Postfach 3049
  Tel. 0631/205-3391                    |           D-6750 Kaiserslautern
--------------------------  My personal opinion only    ---------------------
From: ficchi@condor.navsses.navy.mil
Newsgroups: comp.dcom.lans.misc
Subject: netware 2.15c to 3.11 upgrade
Date: 6 Jan 93 21:51:51 GMT
Followup-To: comp.sys.novell,comp.sys.novell
X-From: ficchi@condor.navsses.navy.mil
X-Newsgroups: comp.sys.novell
X-Date: 6 Jan 93 16:49:55 -0500
X-Organization: NSWCCD, Naval Ship Systems Eng Sta, Phila PA
X-Keywords: netware 2.15c 3.11 upgrade

I currently have a 386 file server running netware 2.15c and i want to
upgrade to 3.11 without having to re-enter bindery information.
What do I need to know in order to make this transition as easy
as possible.    Thank you.   Adrienne Ficchi
From: lui@kitaro.nsc.com (Michael Lui)
Newsgroups: comp.dcom.lans.misc
Subject: Packet Driver using DOS extender
Date: 5 Jan 93 00:44:42 GMT
Organization: National Semiconductor Corporation

I'm going to develop a packet driver using PharLap 386 Dos-Extender. Do I need
a protected-mode kernel or any pm libraries from FTP Software for the packet
driver to work? Any information will be very much appreciated.

- Mike Lui
Xref: sparky comp.dcom.lans.misc:1092 comp.theory:2843 vmsnet.networks.misc:146
From: jmsd@cl.cam.ac.uk (Matthew Doar)
Newsgroups: comp.dcom.lans.misc,comp.theory,vmsnet.networks.misc
Subject: Network Topology Modelling
Keywords: Network, Tolopology
Date: 9 Jan 93 13:47:34 GMT
Followup-To: sender
Organization: U of Cambridge Computer Lab, UK

Does anyone know of any references to attempts to model the toplogy 
of real networks, where lots of nodes are leaves? 

The sort of thing I'm talking about is randomly distributing 
N nodes across a grid and then connecting them somehow to form 
something that looks like a real-life network (e.g. Internet maps). 

I'm aware of Waxman's work (Journal Selected Areas in Communication, Dec 1988)
and a few others. I can't believe that no-one else is working on this!
Mail me and I'll summarise.

-Matt


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Matt Doar, jmsd@cl.cam.ac.uk		            Tel: +44 223 334618
University of Cambridge Computer Laboratory
New Museums Site, Pembroke Street, Cambridge CB2 3QG, England

"... and life to me is mystery, unknown ships on uncharted seas." 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: comp.dcom.lans.misc
From: tbenham@cybernet.cse.fau.edu (Tom Benham)
Subject: SCSI Ethernets
Organization: Cybernet BBS, Boca Raton, Florida
Date: Wed, 6 Jan 1993 23:13:02 GMT

Thanks to the cast of thousands <g> who informed me that
a SCSI Ethernet port is a common way to connect an Ethernet
to an Apple.  I was also reminded that SCSI is not technically
a controller, rather it is an Interface.

Ignorance is bliss until you make an idiot of yourself.

Tom
Newsgroups: comp.dcom.lans,comp.misc
From: jfurr@nyx.cs.du.edu (Joel Furr)
Subject: Info on wireless ethernet link needed
Organization: Nyx, Public Access Unix @ U. of Denver Math/CS dept.
Date: Mon, 4 Jan 93 14:57:30 GMT

My office at Virginia Tech in Blacksburg, Virginia would like to establish
a wireless ethernet connection with another office building that is across
a busy street somewhere between a quarter mile and a half mile away,
clearly visible via line of sight.  The university refuses to trench
between the two for various reasons including cost and disruption of
traffic.  Hence we'd like to know all there is to know about wireless
ethernet products.  I have called Motorola and asked about Altair, called
ATS and asked about their products, called Windata and asked about theirs,
and tried to reach NCR to ask about WaveLAN.  I'm not experienced in this
but I have a feeling from talking to a couple people that I'm barking up
the wrong tree in contacting people who make wireless LANs since they may
not be capable of connecting two buildings a half mile apart.  If you can
suggest other people to call, I'd appreciate it.  If we can get a package
that will provide reliable, high-speed service, we'll buy it.
Newsgroups: comp.dcom.lans,comp.misc