home *** CD-ROM | disk | FTP | other *** search
- TELECOM Digest Fri, 25 Mar 94 12:44:00 CST Volume 14 : Issue 147
-
- Inside This Issue: Editor: Patrick A. Townson
-
- Hunt Groups/Ring-No-Answer-Call-Forwarding (Scott M. Pfeffer)
- ISDN PC-Boards and Supplementary Services (Svein-Ivar Lillehaug)
- Digital Audio Conference Bridges (MCUs) (Svein-Ivar Lillehaug)
- Will Widespread Use of Cell Phones Reduce Crime? (Howard Gayle)
- Telex / Telephone / Country Code List (Paul Robinson)
- Phone Equipment Catalogs (mwolf@pattie.wellesley.edu)
- "Fooling" Caller-ID (A. Padgett Peterson)
- Modem-Connectable Cell Phones? (bobfromtn@aol.com)
- Info Needed About Local LD Carriers in Turkey (Henry Griner)
- Pacific Bell Voice Mail Types (Keith Laaks)
- One Equals On (John Starta)
- Area Code 215 Changed to 610, Why? (Juha Veijalainen)
- Sprint 800 Outage From 201 Area Code? (Paul R. Coen)
- Re: Pager Scam Resurfaces (Christopher Zguris)
- Re: Pager Scam Resurfaces (David Jones)
- Re: CATV Modems (Garrett Wollman)
- Re: CATV Modems (George Gilder)
- Re: CATV Modems (Tony Harminc)
- Re: CATV Modems (Aaron Leonard)
- Internet Address Wanted (Patrizio Menchetti)
-
- TELECOM Digest is an electronic journal devoted mostly but not
- exclusively to telecommunications topics. It is circulated anywhere
- there is email, in addition to various telecom forums on a variety of
- public service systems and networks including Compuserve and GEnie.
- Subscriptions are available at no charge to qualified organizations
- and individual readers. Write and tell us how you qualify:
-
- * telecom-request@eecs.nwu.edu *
-
- The Digest is compilation-copyrighted by Patrick Townson Associates of
- Skokie, Illinois USA. We provide telecom consultation services and
- long distance resale services including calling cards and 800 numbers.
- To reach us: Post Office Box 1570, Chicago, IL 60690 or by phone
- at 708-329-0571 and fax at 708-329-0572. Email: ptownson@townson.com.
-
- ** Article submission address only: telecom@eecs.nwu.edu **
-
- Our archives are located at lcs.mit.edu and are available by using
- anonymous ftp. The archives can also be accessed using our email
- information service. For a copy of a helpful file explaining how to
- use the information service, just ask.
-
- TELECOM Digest is gatewayed to Usenet where it appears as the moderated
- newsgroup comp.dcom.telecom. It has no connection with the unmoderated
- Usenet newsgroup comp.dcom.telecom.tech whose mailing list "Telecom-Tech
- Digest" shares archives resources at lcs.mit.edu for the convenience
- of users. Please *DO NOT* cross post articles between the groups. All
- opinions expressed herein are deemed to be those of the author. Any
- organizations listed are for identification purposes only and messages
- should not be considered any official expression by the organization.
- ----------------------------------------------------------------------
-
- From: sp9183@swuts.sbc.com (Scott M. Pfeffer)
- Subject: Hunt Groups/Ring-No-Answer-Call-Forwarding
- Date: 25 Mar 94 04:01:30 GMT
- Organization: Southwestern Bell Telephone Company
-
-
- Anyone watching this newsgroup worked with hunt groups a lot?
-
- I am trying to figure out how to do the following, and would really
- appreciate input from folks with experience in this area:
-
- The basic idea is to provide 32 dialup modem lines with a backup
- configuration in case a modem goes bad or the rack containing half the
- modems goes bad.
-
- Simply, speaking something like this would be nice:
-
- If the line chosen by the switch is one of the first sixteen, but
- there is no answer after two rings, find a line in the second sixteen
- and ring it instead. This way, if I have a rack of modems on the
- first sixteen go down, or a bad modem is hit on the first rack, the
- rack on the second sixteen will receive the call.
-
- Likewise, if the line chosen by the switch is one of the second
- sixteen, but there is no answer after two rings, find a line in the
- first sixteen and ring it instead. This way, if the second rack goes
- down or a bad modem is hit on the second rack, the rack on the first
- sixteen will receive the call.
-
- Finally, if possible, I'd like a backup arrangement to the backup
- arrangement. A few ideas have been sent my way, but I am not sure what
- makes the most sense ...
-
- A few folks I know have come up with some possibilities, but still I
- am not sure. Here are some ideas. What do you think?
-
- 1. Provide a simple 32-line distributed line hunt group. Then a
- dial-in user may fail on the first call, but will eventually be able
- to get in after multiple retries. Am I correct that Distributed Line
- Hunting will choose the "least recently used" line?
-
- Limitation: User will have to redial to get in if there is no answer.
- It may take up to 16 calls to get to the OTHER rack.
-
- 2. 32-line hunt group. Each line N in the hunt group will have busy
- call forwarding and ring-no-answer call forwarding to another line.
-
- This way, if a call comes in to a bad modem or rack, the call gets
- immediately sent to the other rack. If THAT rack has a bad modem or
- if the line is busy, the call gets sent to the next line in the first
- rack. The cycle will continue in this sequence:
-
- N --> N + 16 --> N + 1 --> N + 17 --> N + 2 --> N + 18 --> N + 3
- ^ --> N + 19 --> N + 4 --> N + 20 --> N + 5 --> N + 21 --> N + 6
- | --> N + 22 --> N + 7 --> N + 23 --> N + 8 --> N + 24 --> N + 9
- | --> N + 25 --> N + 10 --> N + 26 --> N + 11 --> N + 27 --> N + 12
- | --> N + 28 --> N + 13 --> N + 29 --> N + 14 --> N + 30 --> N + 15
- | --> N + 31 --> N + 16 --> N + 32 --:
- |_____________________________________|
-
-
- 3. Part 1: A 32-line distributed line hunt group. Numbers N through N+31.
- Part 2: A 15-line distributed line hunt group. Numbers N+1 through N+15.
- Part 3: A 16-line distributed line hunt group. Numbers N+16 through N+31.
-
- Part 4: Ring-no-answer for line N through N+15 goes to hunt line N+16.
- Part 5: Ring-no-answer for line N+16 through N+31 goes to hunt line N+1.
-
- Then, if a caller gets ring-no-answer, they get routed back and forth
- between the first 16 lines and the second 16 lines. Very similar
- results to solution 2?
-
- As I am new to these features (although I understand the basics), can
- anyone shed some light as to how far off the track I am with this and
- tell me how to get to Grandma's house?
-
-
- Thanks,
-
- Scott Pfeffer Information Services, Southwestern Bell Telephone
-
- ------------------------------
-
- From: sveini@mack.uit.no (Svein-Ivar Lillehaug)
- Subject: ISDN PC-Boards and Supplementary Services
- Date: Fri, 25 Mar 1994 15:09:00 GMT
- Organization: University of Tromsoe, Norway
-
-
- The 1989 Memorandum of Understanding (MOU) identifies 25 supplementary
- services as priority 1 and 2 (5 + 20) for Euro-ISDN.
-
- ISDN adapters may access supplementary services through either the
- Facility Information Element (IE) or the Keypad IE on D-channel
- messages. The Facility IE supports identification of specific
- supplementary services according to standards. The Keypad IE
- identifies strings of keypad codes according to the Keypad Protocol
- (for example *21*<phonenumber>#). Applications can map high level user
- interface menu choices to keypad codes.
-
- In addition, tone signalling such as DTMF (Dual Tone Multiple
- Frequency) is desirable in some cases (for example for remote
- operation of videophones).
-
- Unfortunately it seems like (most?) ISDN adapters only support a
- limited number of the services described above. Hopefully I am wrong -
- therefor I wonder if anyone out there are aware of ISDN boards that
- offer all (or most -- or as many as possible) of the 25 supplementary
- services through their APIs (or CAPI / ETSI-PCI). The access
- obviously has to go through the Keypad IE or the DTMF , signalling.
-
-
- Regards,
-
- Svein-Ivar
-
- ------------------------------
-
- From: sveini@mack.uit.no (Svein-Ivar Lillehaug)
- Subject: Digital Audio Conference Bridges (MCUs)
- Date: Fri, 25 Mar 1994 15:12:40 GMT
- Organization: University of Tromsoe, Norway
-
-
- I am interested in manufacturers (name, address, phone and fax numbers)
- of digital audio MCUs. To be more specific (and exclude some products)
- an interesting product must support the following functionalities:
-
- * Signal interfaces: Digital line signalling
- DTMF
-
- * Possibilities for subscribers to set up the conference
-
- * Allow for parallel conferences and up to 30 (or 50) conference
- participants at the same time.
-
- * Allow for dynamic management of conferences (hang ups as well as
- including new participants during the conference).
-
- * Direct operation through a PC interface for set up of conferences,
- registration and administration of subscribers and cost charges.
-
- What is a reasonable price for equipment like this?
-
-
- Thanks in advance,
-
- Svein-Ivar
-
- ------------------------------
-
- Date: Fri, 25 Mar 94 07:25:29 PST
- From: howard@hal.com (Howard Gayle)
- Subject: Will Widespread Use of Cell Phones Reduce Crime?
- Reply-To: howard@hal.com
-
-
- A friend suggested to me that, sometime in the future, almost everyone
- will carry around a cellular phone almost all the time. She thinks
- this will significantly reduce the amount of crime, because it will be
- very easy to report a crime or other suspicious behavior that one
- observes. I'm skeptical, but it seems like an interesting topic for
- discussion.
-
-
- howard@acm.org
-
- ------------------------------
-
- Date: Fri, 25 Mar 1994 11:26:36 EST
- From: Paul Robinson <PAUL@TDR.COM>
- Reply-To: Paul Robinson <PAUL@TDR.COM>
- Subject: Telex / Telephone / Country Code List
- Organization: Tansin A. Darcos & Company, Silver Spring, MD USA
-
-
- The following is a correction to a prior message.
-
- In a prior issue of TELECOM Digest I noted that a listing of three-
- digit telex codes, telex answerbacks, worldwide telephone area codes,
- and ISO 3166 country codes was listed in my Internet RFC 1394.
-
- The correct location for RFCs is on site DS.INTERNIC.NET (in addition
- to other sites that keep a complete set) and not on RS.INTERNIC.NET.
- 'RS' only has a limited subset of the RFCs. The complete collection
- is on 'DS' in the /rfc directory.
-
- I have just checked, and the file is there.
-
- Please excuse any inconvenience this may have caused you.
-
-
- Paul Robinson - Paul@TDR.COM
-
- ------------------------------
-
- From: mwolf@pattie.wellesley.edu (MUR)
- Subject: Phone Equipment Catalogs
- Organization: WELLESLEY COLLEGE
- Date: Fri, 25 Mar 1994 16:45:12 GMT
-
-
- I'm looking for a mail order outfit, other than Hello Direct, that
- carries a wide variety of phone accessories such as caller ID boxes,
- auto-dialers etc.. I only excluded Hello Direct, as they are already
- sending me a catalog. Thanks in advance.
-
- ------------------------------
-
- Date: Fri, 25 Mar 94 08:55:59 -0500
- From: padgett@tccslr.dnet.mmc.com (A. Padgett Peterson)
- Subject: "Fooling" Caller-ID
-
-
- Since my FAQ posting on Caller-ID, several people have written to say
- that they have heard of a box that can produce an erroneous record via
- a data burst on DE Pickup. None provided details.
-
- My understanding is that the Motorola chip and most Caller-ID boxes
- are designed to only accept data *before* pickup and to stop listening
- when the line is answered. Further, the through connection is only
- made once the line has been answered. For this reason there should not
- be a problem.
-
- Further, I have understood that a Caller-ID box would only accept one
- valid sequence per call.
-
- Two logical possibilities arise:
-
- 1) Some Caller-ID boxes might have a lag between call pickup and last
- acceptance of digits.
- 2) Some switches may connect through before pickup.
-
- If anyone *knows* of any instance where this is true (other than party
- lines or COTS PBX equipment), I would like to know.
-
-
- Warmly,
-
- Padgett padgett@tccslr.dnet.mmc.com
-
- ------------------------------
-
- From: bobfromtn@aol.com
- Subject: Modem-Connectable Cell Phones?
- Date: 25 Mar 1994 01:03:02 -0500
- Organization: America Online, Inc. (1-800-827-6364)
-
-
- Does a FAQ exist with comprehensive list of cell phones and features?
- Specifically I am seeking a phone which will connect to an existing
- modem (not PCMCIA-based).
-
- ------------------------------
-
- From: Henry Griner <hvgriner@DELPHI.COM>
- Subject: Info Needed on Local LD Carriers in Turkey
- Date: Fri, 25 Mar 94 00:54:01 -0500
- Organization: Delphi (info@delphi.com email, 800-695-4005 voice)
-
-
- I need information about who the LD carriers are in Turkey. Also, I
- had something about the rates going up by 100% or more in the near
- future. I would also like to contact anyone in business in Turkey to
- discuss this further. Any leads or help would be great.
-
-
- Thanks,
-
- Henry
-
- ------------------------------
-
- From: itbkl@puknet.puk.ac.za (Keith Laaks)
- Subject: Pacific Bell Voice Mail Types
- Date: Fri, 25 Mar 1994 09:36:36 GMT
- Organization: ITB Department, University of Potchefstroom
-
-
- Hi,
-
- Don't you just love it when you can't access the information you want
- because the information hotline number you have is a Toll-Free number
- in another country?
-
- I see that Pacific Bell's Voice Mail for Business comes in two flavours:
-
- a) Standard ($19.95)
- b) Deluxe ($29.95)
-
- Can anybody tell me how these two mailbox types differ? Do they also provide
- a residential Voice Mail/Call Answer service?
-
- Also, do Telco's provide voicemail to customers with their own PABX?
- If so, how are the calls routed to the Voicemail equipment? I take it
- the Telco will have a centralized VoiceMail node, and will route (divert)
- calls from the business to such equipment.
-
- Is Voice Mail a regulated service? If so, what are these regulations?
-
-
- Keith Email: itbkl@puknet.puk.ac.za
- Potch Univ. Email : Tel:
- Potchefstroom itbkl@puknet.puk.ac.za Voice (0148) 992126
- West Transvaal South Africa FAX (0148) 992799
-
- ------------------------------
-
- Subject: One Equals On
- From: tosh!starta@enuucp.eas.asu.edu (John Starta)
- Date: Thu, 24 Mar 94 19:57:43 MST
-
-
- > Kenn Krasner, Sr. Consultant One Equals On kkrasner@mordor.com
-
- > [TELECOM Digest Editor's Note: Yep, 'one equals on' is the way he
- > wrote it. Its not my typo! Maybe Kenn will explain it. PAT]
-
- If I had to guess I would say that Kenn's company name is a reference
- to the state of a bit in binary; 0 is off, 1 is on.
-
-
- john starta
-
-
- [TELECOM Digest Editor's Note: Good guess! That had not occurred to me. PAT]
-
- ------------------------------
-
- From: JVE%FNAHA@eccsa.Tredydev.Unisys.com
- Date: 24 MAR 94 18:45
- Subject: Area Code 215 Changed to 610, Why?
-
-
- The other day I managed to dial a non-existing number in the USA.
- Area code was 215 and number 385 xxxx. The error message said I
- called area code 610 and number 385 xxxx and, of course, that the
- number did not exist.
-
- Is area code 215 being changed, split or what. Once I got the correct
- number, I could complete my call with 215.
-
-
- Juha Veijalainen System analyst, tel. +358 40 5004402
- Unisys Finland Internet: JVE%FNAHA@eccsa.tredydev.unisys.com
-
-
- [TELECOM Digest Editor's Note: Area 215 has been/is being split into
- two parts with one part called 610. Carl Moore is around that area and
- keeps track of these things extensively; maybe he will fill you in. PAT]
-
- ------------------------------
-
- Date: Fri, 25 Mar 1994 12:23:32 EST
- From: Paul R. Coen <PCOEN@DRUNIVAC.DREW.EDU>
- Subject: Sprint 800 Outage From 201 Area Code?
- Organization: Drew University Academic Technology
-
-
- I had some trouble getting through to one of our software vendors
- today. Whenever I called their 800 number, I got a "all carrier
- circuits are busy, please try later. 1C201" intercept.
-
- Anyway, I figured it wasn't AT&T, because we have AT&T long distance
- service. So one of my co-workers tried Sprint's FON card access
- number (800) 877-8000 -- same intercept. MCI seems to be okay.
-
- Looks like Sprint's 800 service is out from this area. Anyone know
- what is going on? I don't know if this is true on regular Sprint long
- distance, either. I'll try it later on from a payphone.
-
- I suppose the problem could be Bell Atlantic/NJ Bell, as well, but I
- would expect it to be causing other problems.
-
- ------------------------------
-
- Date: Fri, 25 Mar 94 08:29 EST
- From: Christopher Zguris <0004854540@mcimail.com>
- Subject: Re: Pager Scam Resurfaces
-
-
- > [TELECOM Digest Editor's Note: I'm sure our readers ** in the metro
- > New York City area ** appreciate the reminder, but bear in mind that
- > ** no one ** outside the NYC area (212/718, maybe 914/516 ?) can reach
- > this number even if they were paged. '540' is a very local, restricted
- > prefix for the simple reason that the telco in New York has no way to
- > collect on calls outside their area. Dialing 212-540-anything from
- > Chicago for example on MCI gets an intercept saying 'MCI does not
- > complete calls to 976 numbers at this time' ... and via AT&T it just
- > goes to a re-order. I'm not certain, but I think if it is dialed via
- > 10xxx or 1+ , it won't even leave the local CO if outside of NYC and
- > environs. So if anyone chooses to copy out your message and post it as
- > a warning in a company newsletter, etc, I hope they'll include my note
- > as well. Essentially outside of NYC, this is a non-issue, and in my
- ----------- ------- -- --- ---- -- - --- ----- --- -- --
- > opinion, New Yorkers are entitled to whatever they get themselves into!
- ------- --- ------- --- -------- -- -------- ---- --- ---------- ----
-
- Do you write this stuff to intentionally tick people off? Besides
- being obnoxious, this info is wrong to some degree. I know for a fact
- that the Pennsylvania lottery operates a 976-xxxx or similar number
- that is billed at a higher rate than a standard call. If they have
- that, than isn't it possible they have other numbers with the same
- higher-priced billing? Are you saying NYC is alone on this continent
- in its' ability to provide non-900 numbers billed at higher rates?
- Residents of _any_ city (or state) that have 976-xxxx or similar
- numbers and pagers should be aware of this.
-
- > It is even doubtful if the operator of this scam is breaking the law,
- > as sleazy as it may be. Yes, he is requesting that you call a premium-
- > priced phone number, but so do countless other advertisers on radio and
- -- -- --------- ----- ----------- -- ----- ---
- > television each day. No one is making you call the number and the
- ---------- ---- ---
-
- The ones I have heard on radio and TV _advertise_ the price for the
- call as well as the number, last I heard that was the law.
-
- > presumption is you should know where you are calling before you dial. PAT]
-
- With continuous area code splits (some for local calls, some for long
- distance) that will be a neat trick!
-
-
- Christopher Zguris czguris@mcimail.com
-
-
- [TELECOM Digest Editor's Note: I said nothing about New York being alone
- in its ability to do anything. I did say (and we have discussed here in the
- past) that telcos seem to have an understanding with each other not to
- allow calls to each other's premium lines *of the 976 type*. '540' is
- just a variation on '976' in NYNEX-land. Ditto where 900 service is concerned
- to some extent: Long distance carriers will not handle each others calls.
- That is you cannot use MCI to call an AT&T 900 number. You cannot use
- any LD carrier to call a local telco's 900 number. You *can* use any telco
- to call a long distance carrier's 900 number however unless your line is
- blocked from same. The Information Provider does not want his lines full
- of non-revenue (to him) calls from other areas of the country, and the
- phone companies cooperate with that request.
-
- You mention the PA Lottery. Certainly, almost every metro area of the
- USA has 976 service (or in NYNEX's case 540 and 976 service). We have
- dozens of such 'services' here ... try calling a Chicago area 976 number
- in New York ... a few, very benign services, i.e. weather and time of
- day *may* be permitted (I do not have a list of who is what) ... but
- I'll guarentee you the sex-chat and high-priced telemarketing ones never
- arrive here, nor in reverse.
-
- The other thing which makes this 'modem scam resurfaces' thing fishy in
- my opinion is that suppose you have a pager and get such a call. Where do
- you usually go to return the call? Either a pay phone or you use your
- cell phone ... and telcos do not connect to 976 or 900 numbers from pay
- phones either. How are they gonna get paid; are you gonna stand there
- and deposit fifty dollars in quarters in the box? And cellphone carriers
- also typically disallow 976 and 900 calls. Usually the only place you can
- complete these calls is from a private phone within the LATA. PAT]
-
- ------------------------------
-
- From: dej@eecg.toronto.edu (David Jones)
- Subject: Re: Pager Scam Resurfaces
- Organization: University of Toronto, Computer Engineering
- Date: Fri, 25 Mar 1994 09:51:24 -0500
-
-
- In article <telecom14.146.5@eecs.nwu.edu> Stephen Goodman <0003945654@
- mcimail.com> writes:
-
- > Be aware that the pager scam using area code
-
- > 212/540-XXXX
-
- What happens if this number is called from a payphone in NYC? This
- may be a way to cut your losses to 25 cents.
-
-
- [TELECOM Digest Editor's Note: What happens if it is called from a payhone
- is (if NYNEX treats 540 the same way other telcos treat 976/900, and I
- cannot see why they would not) is the call goes to intercept with a
- message that the call 'cannot be completed from the phone you are using;
- and an operator will not be able to complete the call for you ...'. All
- payphones have 900/976 blocking on them which I assume includes 540; it
- must because when you try 212-540-anything via MCI for example, you are
- told MCI won't connect to 976 numbers (their words) if in fact the 540
- you dialed exists; otherwise you just get a not in service message. Local
- premium service by whatever name (sometimes local telcos even have their
- own 900 service) never can be called from outside the LATA.
-
- Now this was not always true ... until maybe five years ago people in
- the San Fransisco area for example who dialed 976-GAYS were told the
- call would cost 'just two dollars for up to three minutes of lively
- adult conversation ... have fun!' while people in Chicago who dialed
- 1-415-976-GAYS heard the same message but could safely ignore it knowing
- they would only pay toll charges of 12 cents per minute during the night.
- It got to the point where no one called their local hot-chat; why pay
- two or three dollars when they could call one in another city for only
- the cost of the toll charges since telcos had no way to bill those out
- of the LATA? The hot-chat lines were packed; the locals could not reach
- their own service if they wanted to with all the out of town callers on
- board; the information providers were making zero since they relied on
- telco commissions (there were none, the calls were all long distance);
- and the telcos finally put an end to it at the urging of the IP's. End
- result and bottom line today: you can't call 976/540 unless you are
- within the reach of the local telco. No payphone connections, no credit
- card billings, no collect calls, no third-numbers, etc. That is why the
- 'pager scam' can cause limited damage if it is still going on. PAT]
-
- ------------------------------
-
- From: wollman@ginger.lcs.mit.edu (Garrett Wollman)
- Subject: Re: CATV Modems
- Date: 24 Mar 1994 19:31:49 GMT
- Organization: MIT Laboratory for Computer Science
-
-
- In article <telecom14.145.2@eecs.nwu.edu>, <gabioud@uni2a.unige.ch>
- wrote:
-
- > Do you know any equipment (modem, remodulator, ...) that allows data
- > communication over the CATV cable. On the user side, the modem should
- > feature a well-known interface (RS232C, Ethernet, ...).
-
- When I was at UVM, we used aging Ungermann-Bass equipment which did
- this, running at 5Mbit/s per direction per channel. We used two
- channels in each direction (3P forward/Q reverse, 4A forward/R
- reverse).
-
- We were contemplating replacing this equipment with 10-Mbit equipment
- from Chipcom, but decided instead to decommission the broadband data
- network.
-
-
- Garrett A. Wollman wollman@lcs.mit.edu
- formerly known as wollman@emba.uvm.edu
-
- ------------------------------
-
- Date: Fri, 25 Mar 94 09:28 EST
- From: George Gilder <0004091174@mcimail.com>
- Subject: Re: CATV Modems
-
-
- Digital Equipment in Littleton, Massachusetts, offers a CATV modem
- called Channelworks that offers full duplex 10 megabit per second
- Ethernet services of up to 70 miles over two cable channels.
-
- Intel, General Instrument, and Hybrid Technologies have announced
- an asymmetrical CATV modem which receives at 10 megabits per second
- but sends at 256 kilobits, with plans for upgrades to a megabit.
-
- Cable coax, reaching 63 percent of the nation's homes and passing some
- 90 percent, is a huge untapped resource for computer communications
- and in the future, I predict, will be used more by computers than by
- TVs. Each cable has a two-way potential of one gigahertz. Because
- CATV operates at over 50 decibels of signal to noise, however, it can
- accomodate as many as 16 bits per hertz, for a total capacity of some
- 16 gigabits per second.
-
- ------------------------------
-
- Date: Thu, 24 Mar 94 15:51:05 EST
- From: Tony Harminc <EL406045@BROWNVM.brown.edu>
- Subject: Re: CATV Modems
-
-
- gabioud@uni2a.unige.ch wrote:
-
- > A CATV cable has a huge bandwidth available. A part of it is usually
- > not used for TV channels and could be used (at least from a technical
- > standpoint) for data transmission, if a return channel is available.
-
- > Do you know any equipment (modem, remodulator, ...) that allows data
- > communication over the CATV cable. On the user side, the modem should
- > feature a well-known interface (RS232C, Ethernet, ...).
-
- There is all sorts of gear available to use the CATV plant for data
- transmission. Probably the most prominent vendor is Scientific
- Atlanta (you guess where they're based :-) ). But you must understand
- that there is no end-user widget you can just attach to your end of
- the cable that will do anything useful along these lines. The entire
- cable plant has to be engineered for data transmission. SA has a set
- of gear that can provide a POTS or ISDN connection as well as the RG59
- TV signal via a black box that attaches to the side of your house.
- Probably they'd be happy to send you the glossies.
-
-
- Tony H. (I have no connection with SA, etc...)
-
- ------------------------------
-
- From: leonard@telcom.arizona.edu (Aaron Leonard)
- Subject: Re: CATV Modems
- Date: 24 Mar 1994 23:37:02 GMT
- Organization: University of Arizona Telecommunications
- Reply-To: Leonard@Arizona.EDU
-
-
- In article <telecom14.145.2@eecs.nwu.edu>, gabioud@uni2a.unige.ch writes:
-
- > A CATV cable has a huge bandwidth available. A part of it is usually
- > not used for TV channels and could be used (at least from a technical
- > standpoint) for data transmission, if a return channel is available.
-
- > Do you know any equipment (modem, remodulator, ...) that allows data
- > communication over the CATV cable. On the user side, the modem should
- > feature a well-known interface (RS232C, Ethernet, ...).
-
- DEC (excuse me, Digital Equipment Corp.) sells a box called a
- ChannelWorks bridge, which bridges Ethernet at full 10Mbps over two
- CATV channels. It's priced in the middle four figures, and is quite
- fast (in terms both of latency and bandwidth). However, it's rather
- finicky in terms of how clean the cable signal must be for it to work
- well.
-
- I understand that Zenith also has (or is working on) such a device,
- although Zenith's is cheaper and only provides .5Mbps.
-
-
- Aaron Leonard (AL104), <Leonard@Arizona.EDU>
- University of Arizona Network Operations, Tucson AZ 85721
-
- ------------------------------
-
- Subject: Internet Address Wanted
- Date: Fri, 25 Mar 94 12:22:19 CET
- From: Patrizio Menchetti <MC4903@mclink.it>
-
-
- Can anybody tell me if the Secretary of State of the State of New York
- has an Internet address?
-
- Thank you in advance.
-
-
- Patrizio Menchetti
-
- ------------------------------
-
- End of TELECOM Digest V14 #147
- ******************************
-
-
- -------------------------------------------------------------------------------
-
- Downloaded From P-80 International Information Systems 304-744-2253
-