Q174242: Frequently Asked Integrated Services Digital Network Questions
Article: Q174242
Product(s): The Microsoft Network
Version(s): WINDOWS:1.3,2.0,2.5
Operating System(s):
Keyword(s): kbmsnkbfaq
Last Modified: 08-OCT-1999
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The information in this article applies to:
- The Microsoft Network versions 1.3, 2.0, 2.5
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SUMMARY
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This article lists frequently asked questions about using Integrated Services
Digital Network (ISDN) with MSN, the Microsoft Network.
MORE INFORMATION
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1. Q. What is ISDN?
A. Integrated Services Digital Network (ISDN) is a high-speed, fully digital
telephone service that provides Internet access with data throughput up to
128 kilobits per second (Kbps). ISDN provides the following benefits:
- Speed: ISDN transmits information over four times faster than analog
modems. That means graphics, audio, and video files on the Internet can be
received much faster, and download time is substantially decreased. If you
are dialing into a corporate local area network (LAN), ISDN allows
programs to run at speeds much closer to the speed of the LAN in the
office.
- Clear connections: ISDN transmits data digitally and, as a result, is less
susceptible to noise than analog transmissions. Data connections are
virtually error-free. Analog modem connections must dedicate some
bandwidth to error correction and retransmission. This overhead reduces
the actual throughput, while an ISDN line can dedicate all its bandwidth
to data transmission.
- Rapid call setup: In addition to raw speed, ISDN calls can be set up much
faster than analog phone calls. While an analog modem can take up to a
minute to set up a connection, you can be transmitting data in about two
seconds with ISDN. Because ISDN is fully digital, the lengthy handshaking
process of analog modems is not required.
2. Q. Does ISDN require a special cable?
A. No. ISDN uses the same cable as your existing telephone system. Most lines
do not require any special conditioning to provide ISDN service because the
existing telephone system is digital. Typically, the only analog connection
is from the telephone company to your home or office.
3. Q. What do I need to use ISDN with MSN?
A. Unlike analog telephone service, ISDN service is not yet available
everywhere. Your telephone company must have the necessary equipment
installed in the central office that serves you. You must also have an ISDN
adapter.
4. Q. How do you know if your telephone company has the necessary equipment?
A. Contact your local telephone company to find out if they have ISDN
equipment, or you may find the information at the following Microsoft Web
site:
http://www.microsoft.com/windows/getisdn/default.htm
5. Q. How are ISDN networks configured?
A. The most common Basic Rate Interface (BRI) ISDN divides the telephone line
into three digital channels: One delta (D) channel for signaling, and two
bearer (B) channels for data, each of which can be used simultaneously.
ISDN may also use a Primary Rate Interface (PRI). These networks use either 24
(23 B plus one D) or 31 (30 B plus one D) channel interfaces. These types of
configurations are usually found in corporate PBX, telephone company, or long
distance carrier offices.
ISDN uses a terminal adapter, which replaces the modem, to adapt the channels
to existing equipment. Traditional telecommunications equipment, such as
telephones and fax machines, can also be attached to the BRI if they have the
proper hardware and software interfaces.
6. Q. What is the difference between single-channel and dual-channel ISDN?
A. The following descriptions of single-channel and dual-channel ISDN are
based on BRI:
- Single-channel ISDN uses one B channel, which means you can connect at 64
Kbps or 56 Kbps, depending on your carrier.
- Dual-channel ISDN combines both B channels of your ISDN line using
Multilink PPP (MP) to connect to the Internet up to 128 Kbps. If you make
a dual-channel call, you cannot use your second channel for other
applications, such as fax or voice calls.
Currently, all of the MSN ISDN telephone numbers in the United States and
Canada can receive dual-channel calls. Dual-channel ISDN is not supported
outside of these two countries. MSN is investigating offering dual-channel
ISDN services in other international markets.
7. Q. How is BRI set up?
A. ISDN service connects your home or office to the telephone company through
a U interface. The U interface, which can be no more than 18,000 feet in
length, is a two-wire connection that connects the wall jack in your home or
office to the telephone company central office. At the central office, the U
interface connects to a Network Termination (NT-1) device. The NT-1 device is
often built into ISDN hardware. The NT-1 device terminates the U interface
and converts it to a T interface for use by terminal adapters.
8. Q. What is a SPID?
A. A Service Profile ID (SPID) is used to identify which services and features
are supplied to the ISDN connection. SPIDs usually consist of the ten-digit
phone number, plus a prefix and a suffix to identify additional services. If
a device is configured without a SPID or with an incorrect SPID, it is unable
to establish and maintain a network connection, even though the basic
transport mechanism has been established.
9. Q. How do I obtain ISDN service?
A. To learn about ISDN, download free ISDN software, and electronically order
an ISDN line from participating telephone companies in the United States,
Canada, or other countries, visit the following Microsoft Web page:
http://www.microsoft.com/windows/getisdn/default.htm
10. Q. How can I sign up for MSN using ISDN?
A. If you are not an MSN member, you need to use an analog modem to set up
MSN and to open an MSN account. For information about how to install MSN,
please see the following article in the Microsoft Knowledge Base:
Q174200 How to Install The Microsoft Network Version 2.5
If you are an MSN member, use your MSN account. To connect using ISDN, use
the following steps:
1. Click Start, and then click The Microsoft Network.
2. On the MSN Sign-In screen, click Settings.
3. Next to the Phone Number box, click Phone Book.
4. In the Service Type box, click ISDN.
5. Click the appropriate entries in the Country, State Or Region, and Access
Numbers boxes, and then click OK.
6. Repeat steps 3-5, but click Phone Book next to the Backup Number box in
step 3.
11. Q. What is the MSN plan for ISDN?
A. MSN is dedicated to providing the highest-quality package for Internet
users and delivering the best content available on the Internet. Currently,
MSN offers one of the largest ISDN Internet networks, with 724 local access
locations worldwide. More than 325 U.S. locations support the point-to-point
protocol (PPP) and multilink PPP (MP). PPP and MP allow throughput rates up
to 128 Kbps.
12. Q. How much does ISDN phone service typically cost?
A. ISDN phone service rates vary with each telephone company. The rate
usually includes a basic ISDN service, and additional per-minute charges.
There may also be an initial setup or installation fee. Contact your local
telephone company to find out what ISDN costs in your area.
13. Q. Which ISDN adapters are supported by MSN?
A. For information about the ISDN adapters supported by MSN, please see the
following article in the Microsoft Knowledge Base:
Q174019 Integrated Service Digital Network Adapters Supported by MSN
Additional query words:
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Keywords : kbmsn kbfaq
Technology : kbMSNSearch kbMSN200 kbMSN130 kbMSN250
Version : WINDOWS:1.3,2.0,2.5
Issue type : kbinfo
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