Eicon Networks ISDN NT1 Especificaciones descargar pdf (Pagina 13)

The real (physical) users connect with the network inside the ISPBX over their D channels.

If they need to communicate with the public ISDN network (for example, to ring home), the

"virtual" user inside the ISPBX sends the service request to the public network on their

behalf.

The services provided by the ISPBX are often different from those provided by the public

network. This can cause problems!

The network service request that a user sends on his D channel arrive in the ISPBX's

internal ISDN. This is not passed directly to the public ISDN. The ISPBX interprets the

request and decides what to send on the D channel that connects it to the public ISDN

network.

Summary

• All ISDN users need to be connected to an ISDN network

• This network can be the public ISDN, or an office-based digital PABX (an ISPBX)

• An ISPBX needs to be connected to the public ISDN

• The various public ISDNs are connected together

• A user's call request might be modified by any of the intervening networks

Q/A

1. When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?

One. The calls to the network actually come from the Primary Rate interface on the ISPBX. As far as the

network is concerned, the ISPBX is a single user with multiple channels available with which to make

multiple calls.

2. Do users on an ISPBX have a D channel connection to the ISPBX or to the public ISDN network?

The users on an ISPBX do not communicate directly with the public network at all.

The users see the ISPBX as the network, and each active user has a D channel connection with the ISPBX,

not the network.

3. An ISPBX can behave like a single user and a network - true or false?

True.

It depends which interface on the ISPBX is being described.

To the users connected to an ISPBX, it appears as a network, and they each can establish D channel

communications with it.

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Eicon Networks ISDN NT1 Especificaciones Pagina 13