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Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!decwrl!amdcad!cae780!ubvax!skip
From: skip@ubvax.UUCP (Skip Addison Jr)
Newsgroups: net.lan
Subject: Re: Baseband <--> Broadband gateways
Message-ID: <440@ubvax.UUCP>
Date: Thu, 13-Feb-86 13:41:31 EST
Article-I.D.: ubvax.440
Posted: Thu Feb 13 13:41:31 1986
Date-Received: Sun, 16-Feb-86 04:15:43 EST
References: <733@abic.UUCP>
Reply-To: skip@ubvax.UUCP (Skip Addison Jr)
Organization: Ungermann-Bass, Inc., Santa Clara, Ca.
Lines: 32
Summary: Depends on network layer protocol

In article <733@abic.UUCP> dlb@abic.UUCP (David Bernard) writes:
>    I am interested in a gateway/bridge product that will provide   
>    a link between IEEE 802.3 & 802.4 networks.
> 
>    Does anyone have knowledge of such a product?  I understand that
>    Bridge Communications and DEC have an offering along this line.
> ...
>                Dave Bernard
>                Allen-Bradley Co.
>                decvax!abic!dlb 

Bridges get involved at the network layer.  IEEE 802.3 & 802.4 only
specify up through the data link layer.  What bridge you need depends
on what network layer protocols you need.  For example, Ungermann-Bass
provides networks based on a variety of different protocols.  Which
bridge software you get depends on which network protocols you're using.
Like Ungermann-Bass's, Bridge's and DEC's bridges will only work on
networks that use their protocols.  Fortunately, we've all started basing
our products on standard protocols, so depending on your system,
vendor A's network interface units may communicate using vendor B's
bridges.

Buffered repeaters do exist that don't know anything about layers higher
than the data link layer.  That may be what you want.  Ungermann-Bass
offers those, as does a company by the name of Veralink, if I remember
right.  For information on Ungermann-Bass's stuff you can contact me.
I don't have an address or telephone number for Veralink, sorry.

-- Skip Addison
   {lll-crg, decwrl, ihnp4}!amdcad!cae780!ubvax!skip
   Ungermann-Bass, Inc
   (408) 496-0111