ISDN stands for Integrated Services Digital Network. 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 can be 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.
The codec has a single module slot supporting 2 B channels using the ViA USA ISDN module. This delivers high quality mono or stereo audio over a single B channel using the Tieline Music algorithm. If you have 2 B channels you can use one as a standby link, or configure higher bandwidth mono or stereo connections using algorithms such as MusicPLUS, aptX Enhanced, or MPEG.
Important Considerations
There are several considerations when using your codec in ISDN mode, including:
•Will you operate within North America or other countries?
•Will you use a single B channel or 2 B channels?
•Which network are you using?
•Is your ISDN line Point-to-Point or Point-to-Multipoint?
•What are your directory numbers (DN)?
•If you are in the US, what are your Service Profile ID (SPID) numbers?
•What is your Multiple Subscriber Number (MSN) if you need to enter this outside North America?
ISDN configuration is influenced by the country in which you operate. For example, a SPID does not need to be entered into a Tieline codec for operation within Europe, but it does in North America.
U and S/T ISDN Interfaces
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, therefore only a single device can be connected to a U interface.
The situation is different in Europe, the UK, most of Asia, Australia, Africa and parts of the Middle East, where 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.
If you have an NT-1 device connected to the U interface line then you will require a Tieline ViA (ST) ISDN module (S/T interface - model: TLISDNEUROVIA). If you don’t have an NT-1 device installed then the Tieline ViA (U) USA ISDN module (U interface - model: TLISDNUSAVIA) will be required. You can ring your telecommunications provider to ask if you’re not sure. Note: In Japan use the Tieline ViA (ST) ISDN module.
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Important Note: Tieline S/T ViA 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. Please note: U interface ISDN terminations do not require terminating resistors. |
How to Configure ISDN G5 Modules
To configure the codec to dial using ISDN for the first time:
1.Ensure that the correct country setting is configured in your codec via Home screen > Settings 
> System > Country 
.
2.If you are dialing between two Tieline codecs configure an ISDN dialing program via Home screen > Dialer 
.
More advanced module and answering settings can also be configured:
a.Select Home screen > Settings > Transport Interfaces> ISDN Module 
to adjust ISDN module settings specific to your codec site.
i.See Configure ISDN Module Settings for more information about configuration using the TOUCH SCREEN.
ii.See Configuring ISDN Modules to adjust settings using the HTML5 Toolbox Web-GUI.
b.ISDN answering can be configured to suit:
•Hardware available in the codec, i.e. the number of B channels available.
•Expected dialing behaviors, e.g. if B channels should bond or not, and whether audio streams need to use Route tags.
•The type of call being made, e.g. Tieline (with Tieline Session Data) versus non-Tieline (sessionless calls).
To adjust answering configuration using the TOUCH SCREEN select Home screen > Settings > Answering > ISDN Answering and see ISDN Answering Configuration for more information.
To configure answering settings with the HTML5 Toolbox Web-GUI see Configuring ISDN Answering.
