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ISDN
The Tieline Commander and the Tieline
iMix have been designed to attach an optional ISDN communication module
with specialized software which enables 64kbps and 56kbps data rates
to be used. Both of these rates support the Tieline 15kHz studio quality
music algorithm and popular G.722 standard algorithm for connection
to other brands of ISDN codecs.
Installation of the ISDN module is simple and can be installed within
minutes. Many customers who purchase the Commander often upgrade their
unit by installing the ISDN module when they have a requirement for
ISDN broadcasting.
1. What is ISDN?
ISDN (Integrated Services Digital Network)
is a digital telecommunications standard that allows high speed
digital connections from point to point over the ISDN network. With
ISDN, voice and data are carried by bearer channels (B channels)
occupying a bandwidth of 64 kb/s (bits per second). Some North American
switches limit B channels to a capacity of 56 kb/s. A data channel
(D channel) handles signaling at 16 kb/s or 64 kb/s, depending on
the service type.
There are two basic types of ISDN service:
Basic Rate Interface (BRI) and Primary Rate Interface (PRI). BRI
consists of two 64 kb/s B channels and one 16 kb/s D channel for
a total of 144 kb/s. This basic service is intended to meet the
needs of most individual users.
POTS (Plain Old Telephone
System) cannot handle large quantities of data, it can only
carry data at around 28.8kbps. ISDN can provide two data channels
each operating at 64kbps (for a total throughput of 128kbps).
2. What do I need for
ISDN?
ISDN is an option only available for the
Tieline Commander and iMix codec models. You can order a Commander
or iMix with the ISDN modules already installed.
If you already own a Commander or iMix and want to upgrade it to
ISDN you can order the plug and play ISDN module and install it
yourself. The following items will be required for the ISDN upgrade:
• An ISDN module
(2 types available “U= U.S.A” and “S/T= European”)
• Required software
• ISDN installation instructions
• Upload instructions
Please contact Tieline Technology here
for further information.
3. What ISDN module do
I need?
Tieline Technology has two different ISDN
Modules available. The module that you need depends on whether you
have a NT-1 device connected to the line. Most North American installations
do not have an NT-1.
In the U.S., the telephone company provides
its BRI customers with a U interface. The U interface is a two-wire
(single pair) interface from the phone switch, the same physical
interface provided for POTS lines. It supports full-duplex data
transfer over a single pair of wires, therefore only a single device
can be connected to a U interface.
In North America, the Customer Equipment
(CE) is usually connected directly to the 'U' Interface.
The situation is different Europe, UK, most
of Asia, Australia, Africa and parts of the Middle East where the
phone company is allowed to supply the NT-1, and thereby the customer
is given an S/T interface.
The NT-1 is a relatively simple device that
converts the 2-wire U interface into the 4-wire S/T interface. The
S/T interface supports multiple devices (up to 7 devices can be
placed on the S/T bus) because, while it is still a full-duplex
interface, there is now a pair of wires for receive data, and another
for transmit data.
If you have a NT1 device connected to the
U interface line then you will require Tieline S/T ISDN module.
If you don’t have an NT1 device installed then the Tieline
U ISDN will be required. You can ring your telecommunications provider
to ask if you’re not sure.
In Japan,
you will need the Tieline S/T ISDN module.
| North
America 'U' interface |
European
'S' interface |
| Model |
Tieline Part Number |
Model |
Tieline Part Number |
| Commander Field |
TLISDNUS |
Commander Field |
TLISDNEU |
| iMix |
TLISDNUS |
iMix |
TLISDNEU |
Contact Tieline here
to find out how to order
4. What information do I
need from the phone company?
To properly
configure the Tieline for ISDN there are some simple setups required.
The information required depends on where you are located (due to
different ISDN standards across the globe). Most of the following
questions can be answered by your network provider.
5. How do I setup ISDN
mode?
In order to use the Tieline in ISDN mode
you must enter the following information in the "ISDN Setup" menu.
These settings are a one-time setup and you will not be required
to enter them each time you want to make a connection.
5.1 ISDN Auto
answer
5.2 ISDN Network
5.3 ISDN Line type
5.4 ISDN Interface
5.5 SPID 1 and SPID 2
5.6 DN1, DN2
5.1 ISDN Auto answer
The ISDN auto answer allows you to set whether
or not you want to manually answer or have the Tieline automatically
answer an incoming call.
Note: the Tieline, when set into ISDN mode
will react to incoming ISDN calls only. If the Tieline is set into
another mode such as POTS, then ISDN calls will be ignored.
Back to "How do I set up ISDN mode?"
5.2 ISDN Network
In order for the ISDN module to work you
need to know which switch type to use. This information can be obtained
from your phone company, however most countries excluding North
America should find that EU-ETSI will work fine.
The following table is provided to help
you identify the possible switch type in your country. You should
double check with your network provider.
ISDN Software
Type Loaded |
Networks
|
Select |
US/CAN
ISDN (ISDN Type=SFUS or SGUS) Prefer SGUS * |
US-Nat |
If switch type is national ISDN-1 and
2 |
US-DMS |
If switch type is Northern Telecom
DMS100 |
US-AT&T |
If switch type is AT&T Custom |
European ISDN (ISDN
Type=SFE or SGW*) |
EU-ETSI |
If switch type is ETSI (Europe, Australia,
and most other countries) |
Asian ISDN (ISDN
Type=SFASIA or SGW*) |
JPN-NTT |
If you are in Japan
and your network is NTT |
Back to "How do I set up ISDN mode?"
5.3 ISDN Line type
The ISDN line type can work in two different
modes, PtP (Point-to-Point) or PtMP
(Point-to-Multipoint). You will need to contact your phone company
to find out which setting this should be.
On your Tieline, go to "MENU" and "ISDN
SETUP" to select the correct options for your line.
Back to "How do I set up ISDN mode?"
5.4 ISDN Interface The
ISDN interface refers to the 2 different ISDN line configurations.
The “U” 2 wire cable (common in
North America) and the “S/T”
4 wire cable (common outside North America).
If your Tieline is directly connected to
a “U” ISDN line you must have a “U” interface
“ISDN module” installed in your Tieline with the unit’s
ISDN interface set to “U”.
If your Tieline is connected to an “NT-1”
line you must have an “S/T” interface “ISDN module”
installed in your Tieline with the unit’s ISDN interface set
to “S/T”.
See 3. What ISDN
module do I need? to find out more.
Back to "How do I set up ISDN mode?"
5.5 Local Sub Address
The
Local Sub Address setting allows you to configure the Tieline to
work if the ISDN line is shared with another device.
Enter a unique number between each device
as a sub address. To ring a Tieline with a non blank sub address
you must dial the normal ISDN number followed by a “*”
(asterisk) followed by the sub address.
For
example say the ISDN number is 555 5555 and the sub address is 4
then the number to dial is 555 5555*4
Note: sub address *1 is not permitted
Back to "How do I set up ISDN mode?"
5.6 SPID 1 and SPID 2 (North America Only)
SPID (Service Profile ID) numbers
are used in North America only and are required by the central office
switch, for addressing and handshaking to your ISDN terminal adapter.
The SPID numbers can be obtained from the
phone company. Some ISDN lines use two SPID numbers, some use one
and some use none at all. If only one SPID number has been given
then you need to use the same number in both SPID 1 and SPID 2 fields
in the setup.
In many cases however, a Terminal
Identifier (TID) is required at the end of the SPID (usually
00, 01, or 11) the phone company might neglect to mention this
Back to "How do I set up ISDN mode?"
5.7 DN1, DN2 (North America Only)
DN (Directory Numbers) are the ISDN numbers
assigned to each B channel of the ISDN line and are required only
for North American users.
North American users must get the DN numbers
from the phone company and enter them in the DN1 and DN2 fields.
Note: you usually need to enter the Directory
Numbers with the area code (10 digits) while some other ISDN devices
may only require 7 digit local numbers.
Back to "How do I set up ISDN mode?"
6. How do I enable ISDN mode? Enabling
ISDN mode is a simple process, by changing the units “Op Mode”
to “ISDN” from the units “View Config” menu
item.
7. How do I install the ISDN module?
You can purchase a Tieline Commander or
iMix with the ISDN module already installed. If you already own
a Tieline codec, upgrading your Tieline for ISDN is an easy process.
However we recommend that a fully qualified technician upgrades
the codec using anti-static precautions to help minimize the chances
of static charges damaging the highly sensitive circuitry.
Contact Tieline Technology here
to find out more, or to locate your nearest support and upgrade
office. We have support and upgrade offices in the USA, England,
Netherlands, Singapore and Australia.
8. What software do I need for ISDN?
The software that you need to install will
depend on how old your Tieline is and how long ago you last made
a software change. We recommend that you upgrade your Tieline with
the latest CPU and DSP software including the G.722
software.
Contact Tieline Technology here
to find out more, or to locate your nearest support and upgrade
office.
9. How can I tell what current version
software is installed?
The easiest way to see what software
is installed in your Tieline is to go to the “Unit Details”
menu item. The Unit details will list all the programs installed
along with their versions. To scroll down the list simply rotate
the “Menu Selector”
Glossary of terms
BRI
DN (Directory Number)
G.722
ISDN (Integrated Services Digital Network)
Local Sub Address (Optional)
NT-1
POTS (Plain Old Telephone System)
PRI
Point-To-Point and Point-To-Multipoint
SPID numbers (Service Profile ID)
TID (Terminal Identifier)
U-Interface
S/T Interface
Switch Type
BRI (Basic Rate Interface)
BRI (Basic Rate Interface) commonly referred
to as "2 B+D" BRI consists of 2 'B' channels and 1 'D' channel.
Each "B" channel operates at 64 kbps
and the 'D' channel operates at 16 kbps. BRI can deliver a total
bandwidth of up to 144 kbps.
Back to Glossary
DN (Directory Number)
The Directory Number is an ISDN number assigned
to each B channel of the ISDN line.
Back to Glossary
G.722
G.722 is an encoder that can compress audio
to the data rate of the ISDN line and has an audio bandwidth of
around 7 kHz.
The Tieline codec can interface with any
brand of codec which supports the statistical G.722 synchronization
standard.
Back to Glossary
ISDN (Integrated Services Digital Network)
A digital telecommunications standard, that
allows high speed digital connections from point to point over a
network.
Back to Glossary
Local Sub Address
(Optional) Two Local ISDN devices
can share the same ISDN line by using a unique local sub address
to identify each terminal on the BRI (Basic Rate Interface). Local
sub addresses are not always required and are defined by the user
in the ISDN setup.
Back to Glossary
NT-1 (Network Termination
1)
The NT-1 is a relatively simple device that
converts the 2-wire U interface into the 4-wire S/T interface. The
S/T interface supports multiple devices (up to 7 devices can be
placed on the S/T bus)
Back to Glossary
POTS (Plain Old Telephone System)
POTS
Refers to the standard analog telephone service that is generally
restricted to 3.5 kHz Bandwidth.
Back to Glossary
PRI (Primary Rate Interface)
commonly referred to as "23 B+D
In North America and Japan
PRI consists of 23 'B' channels and 1 'D' channel and provides a
total bandwidth of 1.544 mbps
In Australia, Europe and other parts of
the world PRI consists of 30 'B' channels and 1 'D' channel and
provides a total bandwidth of 2.048 mbps
Back to Glossary
Point–To–Point
and Point-To-Multipoint Point-to-Point
is a connection between two different locations whereas Point-to-Multi-Point
is a link to one or more locations.
Back to Glossary
SPID numbers (Service Profile ID)
SPID numbers are used in North America only,
and are required for addressing and handshaking to your ISDN terminal
adapter
Back to Glossary
TID (Terminal Identifier)
The TID is a two digit number for
use on non-initializing terminals when required. The TID number is
an extension to the SPID number during the Tieline ISDN setup.
Back to Glossary
U-Interface
In the U.S., the telephone company provides
its BRI customers with a U interface. The U interface is a two-wire
(single pair) interface from the phone switch, the same physical
interface provided for POTS lines. It supports full-duplex data
transfer over a single pair of wires, therefore only a single device
can be connected to a U interface.
Back to Glossary
S/T Interface
The S/T-interface is the 4-wire connection
from the NT1 that connects to your ISDN device. S/T is a common
standard around the world excluding North America and Canada.
Back to Glossary
Switch Type
ISDN switch types are protocols that different
phone companies use for sending audio and data down the ISDN line.
Back to Glossary
References
http://www.alpha-tele.com/support/support_files/support_spid_info.htm
http://www.cnet.com/Resources/Info/Glossary/Terms/isdn.html
http://www.ucertify.com/studynotes/C1D0-410.pdf
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm
http://www.slac.stanford.edu/comp/net/isdn.html
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