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.
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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.
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Important Note: For detailed information about connecting with other brands of codec using ISDN visit www.tieline.com |
