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© Tieline Research Pty. Ltd. 2021
Gateway and Gateway 4 Manual v1.2
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Configuring ISDN
A single module slot is available to insert an optional Euro ISDN module into the codec for primary
or backup connections. The Basic Rate Interface (BRI) of ISDN consists of 2 bearer (B) channels at
64 kbps each and 1 data (D) channel at 16 kbps, i.e. (2B +D). This is provided over a 2 wire facility
and the two B channels can be bonded together to form a single 128kbps channel. The B channel
can carry user information such as voice, video or data. The D channel carries signaling information
between a user and the network.
Tieline codecs fitted with a Gateway Euro ISDN module can provide high quality mono or stereo
audio over a single B channel using the Tieline Music algorithm. With 2 B channels one can be
used as a standby connection, or configure higher bandwidth stereo connections using 2 B
channels with algorithms such as MusicPLUS and MPEG. It is also possible to bond two B
channels to configure higher bandwidth mono connections.
Important Considerations
There are several considerations when using your codec in ISDN mode, including:
· Is a single B channel or 2 B channels required?
· Which network is being used?
· Is the ISDN line Point-to-Point or Point-to-Multipoint?
· What are the directory numbers (DN)?
ISDN configuration is influenced by the country in which you operate and a Service Profile ID (SPID)
number does not need to be entered into a Tieline codec for operation outside North America.
S/T and U ISDN Interfaces
In Europe, the UK, most of Asia, Australia, Africa and parts of the Middle East, the phone company
is allowed to supply the NT-1 and the customer is given an S/T interface. The NT-1 is a relatively
simple device that converts a 2-wire U interface into the 4-wire S/T interface. In North America 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. It supports full-duplex data transfer over a single pair of
wires. If an NT-1 device is connected to the U interface line then a Tieline Euro ISDN G6 module is
required (S/T interface - model: TLISDNEUROG6). Note: The Gateway Euro ISDN module is suitable
for Japan. Tieline does not support U interface module connections in North America as ISDN is
either unreliable or unavailable in many markets.
Important Note: Tieline Gateway Euro ISDN modules do not have internal terminating
resistors. When you connect terminating equipment such as a Tieline codec to an NT-1,
100 ohm termination resistors must be connected between pins 3 and 6 and between
pins 4 and 5 at the last socket on the ISDN line. Check your NT-1 device user manual as
this may be supported. Suppliers of electronic components sell suitable plugs with
termination resistors when required.
Use the HTML5 Toolbox Web-GUI to configure a dial and/or answer program with ISDN settings. It
may be necessary to:
1. Configure ISDN module settings.
2. Configure ISDN Answering settings.
Important Note: For detailed information about connecting with other brands of codec
using ISDN visit www.tieline.com
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