Talk:Integrated Services Digital Network
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[edit] BRI/PRI are introduced without definition in "Consumer and Industry Perspectives"
I explained the acronyms and added links to articles, but it might be useful for a more knowledgeable editor to weave in more definition. They are then later explained in "Configurations." Perhaps Configurations should appear before Perspectives? Describe the technology THEN describe reaction? I'll let someone else make that change, as it's late and I don't trust my judgment. ;) Cheers. Josh Powell 08:36, 19 April 2007 (UTC)
[edit] Removed parts of article
Removed 4ESS, 5ESS and DMS-100, which are products and not protocols. Although there may be protocol variants used by these products.
Yaronf 22:11, Mar 3, 2004 (UTC)
[edit] Radio Stations
I dont know if this is correct, but I believe a lot of radio stations used ISDN for studio to studio connections, such as interviews, panel discussions, guests, etc... as well as some times hosts working from home via ISDN connection to the studio.
--Weyoun6 07:52, 23 Mar 2005 (UTC)
- In the 1990s they did, where available, however these days they'd use far more convential internet systems, or occasionally private setups, or leased lines. --Kiand 00:43, 4 February 2006 (UTC)
me a a user of ISDN
Yep, at The BBC we use ISDN on a regular basis for connecting studios and most crucially for Outside broadcasts. All sporting venues have ISDN and they have proved a perfect solution for years and are not showing signs of vanishing. Unfairly the Network has suffered at the hands of engineer humour too... often labelled 'It Sometimes Dose Nothing'. However this is more often the Codecs problem not the Line. With Telos and SystemBase leading the Market in quality ISDN Codecs we currently broadcast Classical concerts live with almost no loss of quality. this is mostly using 4 bearers (256kbps).
[edit] Obselete?
Is it fair to declare ISDN dead yet?
Where I am (the UK) it certainly seems to be in all areas where ADSL is available. The main advantage of ADSL through ISDN (being able to directly connect to another ISDN user and have a dedicated line) has been rendered moot by the sheer speed advantage of ADSL. Even with contention and network lag, an 8M/500K ADSL is still going to leave a 128K ISDN line standing, and is much cheaper (again, I can only speak for the UK here)
I've been searching on google and I can't find any information on ISDN that isn't very outdated. Damburger 08:59, 7 July 2006 (UTC)
- Whereas internet access as one of the major drivers for initial ISDN take-up has largely been removed, the other (connection of company PBXs to the public network) remains strong and is either still growing or only slowly eroding in the countries that I am aware of. JanCeuleers 12:29, 7 July 2006 (UTC)
In the US, ISDN appeared to be dead before it became alive. The joke among Bell Labs system engineers who worked on ISDN was that acronym stood for "Integration Subscribers Don't Need" and answered what ISDN is good for with "I Sure Don't kNow". LoopTel 09:37, 10 January 2007 (UTC)
ISDN is still used for videoconferencing. I am an installer and most of the systems we build have both ISDN and IP connections (both get used on a regular basis at most institutions.) I have heard people talk about ISDN becoming extinct for at least a decade now, but from my perspective this is not the case. ISDN is still a good way to make a videoconference call to another institution without extensive network configuration and without exposing the local data network.
NEED A "ISDN vs. IP" CLARIFICATION - I recently became involved with videoconferencing and came here to learn the difference between ISDN and IP connections. I often hear people (incorrectly?) referring to a network connection as being one or the other. After reading the articles on both I feel that a paragraph stating their relation (with respect to videoconferencing) would be very helpful. I'd offer but like I said, I'm a newbie.
Obselete for what?
- For Internet Access? - Yes, DSL and cable modems are much better and faster.
- As a replacement for POTS? That depends on the country! ISDN was never widespread in most parts of the world, with one exception: the German-speaking countries and especially Germany. A German who is speaking about the "öffentliches Telefonnetz" (the German term for public switched telephone network) will most likely mean "ISDN and POTS"! (Yes, ISDN first!) However, in fact only 30% of the German public circuit-switched telephone network are actually ISDN lines, but that's only because there are so many old fixed telephone lines. I worked for Hansenet, a German telecom, until May last year, and 94% of all new fixed phone lines from this company between January and May last year were ISDN, only the other 6% were POTS lines. The reason for this popularity of ISDN in Germany is very simple: It's the price policy of the German telecoms! For example, an ISDN line from Hansenet costs only 2€ more then a POTS line, but an ISDN line has the 2 B-channels, and at least 3 telephone numbers. And there is Arcor Telecom, the second largest German telecom, which never offered POTS. They prefer to offer Hardware with an integrated terminal adapter to their customers. ISDN is actually the native mode of the German public telephone network (since the network is fully digital since 1995), POTS-service needs additional hardware, either at the side of the customer (Arcor), or at the telephone exchange (Which , however, is always installed at the telephone exchange - with the exception of Arcor, of course.) Even the very most German ADSL lines are bundeled with ISDN, and not with POTS! I think ISDN is as much obselete as POTS! ;) 86.56.0.159 16:37, 12 August 2006 (UTC)
- Being a German, I completely agree with what you wrote.
- Here in Germany, you just order an ISDN line, buy a ISDN-DECT basestation with some handsets, and hand them out to your household members. Now everyone has its own phone number (MSN), up to two people can make calls at the same time, and the phone bill will be splitted by the MSNs. All at very decent prices (compared to POTS).
- All this seems to be the result of the heavy ISDN marketing efforts Deutsche Telekom has made in the mid-1990s, making ISDN well-known and the equipment prices low.
- --213.39.187.230 20:00, 3 December 2006 (UTC)
Here in Colombia, medium and big Enterprises uses ISDN very regulary, and not only for videoconferences.
[edit] Business Use:
ISDN is still in massive use (even in the USA) for connecting multiples of 30/24 (PRI – E1/T1) voice channels to PBX and other switching gear.
[edit] VoIP products:
Specifically IAD (Integrated Access Device's) may have ISDN BRI (S0) or ISDN PRI (E1/T1) interfaces – these IAD are used to front-end legacy equipment (PBX, IPBX), or supply PBX functionality towards the new voip standards (SIP/MGCP) that are now coming to the fore
The main reason for using Voip is cost –
1. An ADSL data link is effectively free - therefore you can have multiples of 30 (E1/T1) or 2 (BRI) voice channels connected for just the price of the ADSL/SHSL monthly connection fee.
2. Alternatively you can connect to your own LAN/WAN for no cost (might be an idea to let your network people know first though :})
The main reason for using an IAD is cost –
1. You do not have to replace your existing equipment and therefore there is little impact for users (and no re-training).
2. You can just use the IAD without a PBX (connect direct)
3. You can use other VoIP products connected to the IAD (and restrict their use)
Note: PRI interfaces have normally been connected to SHDSL rather than ADSL - however with the recent innovation such as ADSL2+ and ADSL AnnexM - it is now entirely possible to provision an E1/T1 (depending on the codec used) on a single or bonded ADSL.
Note: The QoS (ATM and IP) of the incumbent network is a vital factor in the quality of the voice. (See articles on DiffServ).
Note: There are also 'mixed' IAD as well - with POTS and ISDN interfaces - some IAD also have SIP Proxy servers enabled to connect up a network of VoIP (SIP) devices and either forward to other networks or just be a private network on its own.
Note: SIGTRAN IUA is also possible on some VoIP 217.207.193.222 (talk) 13:47, 8 January 2008 (UTC)IAD
Even in countries like Germany, there is starting to be an uptake on VoIP for BRI - purely for cost reasons (NetCologne are attempting a voip solution for BRI/POTS)
[edit] "Backronym"
The article begins with,
- "Integrated Services Digital Network (ISDN)"
and then goes on to explain,
- "The English term is a backronym that was thought to be better for English-language advertisements than the original, "Integriertes Sprach- und Datennetz" (German for "Integrated Speech and Data Net")."
hi this is Sumit from india i am new into ISDN configuration,any one can help me how to configure ISND and MPLS leased line together both should be working simultaniously.
[edit] Brazil
"in Europe, India and Australia it is 30B+1D, with an aggregate bit rate of 2.048 Mbit/s (E1)"
In Brazil, too. Zwargh 23:55, 11 June 2007 (UTC)
[edit] Synchrony, where needed, is an important factor in ISDN's favor
1. I don't think ISDN belongs so tightly coupled with the notion of Internet access, or TCP/IP, because it works just fine without either. ISDN originated for easily scalable constant-latency low-to-high-bandwidth guaranteed-in-order-arrival digital connections. Point-to-point (dialled ISDN#-to-ISDN#), it is extraordinarily reliable - exactly as reliable as the digital backbone of the public switched telephone network itself, since each packet rides that same network.
2. Internet access via ISDN is facilitated by a gateway which performs protocol conversion from circuit-switched to packet-switched: at this interface, all synchrony guarantees may be lost, since TCP/IP makes no such guarantee. If the upper tier network is ATM or otherwise innately synchronous, then synchrony may still be guaranteed, depending on the service-level agreement. Synchrony is not as critical for internet-access users, but is important to voice and video conference users.
--Lexein 05:46, 2 September 2007 (UTC)
- Yes, it is helpful for non-telco-geeks to understand that to the telco industry, the pipe is separate from Internet service it carries, whether we're talking about ISDN, T1, or DS3. In the most basic terms the pipe is nothing more than a serial data port, over which TCP/IP or anything else can be carried.
- The end user could just as easily use ISDN to print to a remote serial printer miles away, directly feeding the serial port from the computer into the local ISDN customer premises interface, and the printer into the remote interface, and not using TCP/IP or anything else as an intermediary to carry the data.
- ISDN somewhat predates the rise of the Internet's popularity, and wasn't explicitly built for that purpose. Videoconferencing equipment that utilizes ISDN in its rawest form is just a point-to-point serial data interface and doesn't need to use TCP/IP at all. Though in this configuration the connection is limited to a single videoconference link between two sites, and cannot utilize advanced TCP/IP routing features like multicast to send from one source to many destinations.
- This holds true for faster services like T1. You can buy a raw pipe between two points and run your own serial data over it. Or you can buy a pipe that just goes straight to the telco only, on top of which you pay the telco for the separate Internet data service over the pipe from them.
[edit] Jaxin Hall
The sentence about Prof. Jaxin Hall of Sussex inventing ISDN in the late 1980's is not correct. I did not delete the sentence because this - by an IP Address - would probably be interpreted as vandalism. ISDN has already been tested before Jaxin Hall supposedly invented it. The problem is that many other web sites copy this incorrect information, but because it is referenced (you need an IEEE usbscription to read the article) no one dares to delete it. MM —Preceding unsigned comment added by 193.61.255.87 (talk) 09:58, 5 November 2007 (UTC)
- I have accessed the IEEE article from my University's network. There is no mentioning of a "Jaxin Hall" anywhere in the document. — 134.100.32.10 16:09, 6 November 2007 (UTC)
- The "Jaxin Hall" assertion was made by IP 146.171.254.66 on 20 September 2007 and has nothing to do with the IEEE article. I will remove the assertion. — 134.100.32.10 16:25, 6 November 2007 (UTC)
[edit] ISDN at 128 kbits per second
Don't you think this artical should directly relate to ISDN's speed right at the very beggining or near, sometime after the introduction. And why not? The reference to it as you scroll almost WAY down begins in something like "Because ISDN's speed is only 128kbs," almost as if the article already informed you on the point; which I'm sure most readers looking up ISDN do it for history sake and really want to know it's speed right off. Wikipedia is aimed at the leanient audience, so why be so unbecoming about it. ---------Bill Mclemore
- I slightly rewrote the intro to highlight that detail. DMahalko (talk) 05:38, 31 December 2007 (UTC)
- I have to say, ISDN is still very big here in Germany. However barely anyone is using it for internet access anymore as DSL is much faster and cheaper than dialup. But it is excellent for families or shared student flats as you get two voice channels and up to 10 phone numbers for only a few euros (2-4) more than analog. ISDN and ADSL on the same line is a very common configuration here. — 213.39.174.131 (talk) 10:35, 3 May 2008 (UTC)
[edit] ISDN is touted for videoconferencing? Are you joking?
I am rather humored to see one of the positive aspects of ISDN being its support for videoconferencing. Has anyone writing about the positive features of ISDN ever even seen its videoconferencing in action? It is plainly just awful. Horribly low-resolution, low-framerate.. When videoconferencing is discussed in the context of ISDN they really mean "videoconferencing via a 320x200 pixel blurred, jumpy mess". Try to do anything serious with it, and it's more of a psychedelic artform that any sort of business conferencing system. DMahalko (talk) 21:29, 31 December 2007 (UTC)
- It depends upon how many B-channels you use. Business users often use more than two. ISDN is an excellent system for constant bitrate services like videoconferencing. --213.39.186.137 (talk) 21:28, 7 January 2008 (UTC)
I also agree, were I work we use 384KBs ISDN over a T1 for Compressed Video Confrencing using Cisco equipment and its wonderful...Its not FULL HD, but its still good quality and very decent frame rates. -Edwin —Preceding unsigned comment added by 68.230.96.153 (talk) 10:57, 26 January 2008 (UTC)
