Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site decwrl.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!decvax!decwrl!dec-rhea!dec-netman!callahan
From: callahan@netman.DEC (JOE CALLAHAN TWO/E17 DTN247-2843)
Newsgroups: net.lan,net.dcom
Subject: Re: ETHERNET on Broadband
Message-ID: <2926@decwrl.UUCP>
Date: Thu, 27-Jun-85 16:36:50 EDT
Article-I.D.: decwrl.2926
Posted: Thu Jun 27 16:36:50 1985
Date-Received: Sat, 29-Jun-85 00:36:09 EDT
Sender: daemon@decwrl.UUCP
Organization: DEC Engineering Network
Lines: 53
Xref: watmath net.lan:892 net.dcom:1065

[]

seismo!camelot!schoff asked for info regarding DEC products to put 
ETHERNET on a broadband cable plant.

Digital does offer a set of products to permit ETHERNET operation 
over broadband cable systems.  They are alternatives to the baseband 
transceiver but look just like it to all the other ETHERNET 
devices, e.g. DEUNA, DELNI, etc.

---------------------------------

PRODUCT DESCRIPTIONS

Broadband Ethernet Transceiver
The Broadband Ethernet Transceiver (DECOM) is the device that provides
physical and electrical interface to the broadband coaxial cable.  The
transceiver transmits signals onto the coaxial cable, receives signals from
the cable, and detects any message collisions that may occur.

Single Cable Broadband Ethernet Transceiver (DECOM-BA/BB)
The single cable Broadband Ethernet Transceiver transmits in the frequency
band of 54-to-72 megahertz (MHz) and receives at 210.25-to-228.25 MHz.  This
transceiver requires a Frequency Translator (DEFTR) at the network headend
to convert the Broadband Ethernet signals from their transmit to their
receive frequencies.  One DEFTR is required per network.

Dual Cable Broadband Ethernet Transceiver (DECOM-AA/AB)
The dual cable Broadband Ethernet Transceiver transmits and receives the
Ethernet signals at the same frequencies, in the band from 54-to-72 MHz.
This model does not require a Frequency Translator (DEFTR) at the network
headend.

-------------------------------

I don't have current info on prices and availability.  For that
contact the Digital sales office nearest you. If the person you
reach has trouble with your questions, ask to talk to someone from
the "Network Sales Team". 


(Usual disclaimers re: these being my own and not my employer's opinions,
                        but in this case I'd better be pretty 
                        close to being "right")

/s/ Joe Callahan     (... then is Real Intelligence that which has not 
                         (yet) been reduced to a set of rules? )

(DEC Easynet)	NETMAN::CALLAHAN
(UUCP)		{decvax, ucbvax, allegra}!decwrl!dec-rhea!dec-netman!callahan
(ARPA)		callahan%netman.DEC@decwrl.ARPA
(Telephone)	617-858-2843