What are SPIDs?
Explain the call flow in nss and what is sri signal?
What do the layers look like?
How ISDN and analogue networks interact?
What happens when a call is set up?
How users are connected to a public ISDN through an ISPBX?
What item of equipment would be required to connect a modem to ISDN? A terminal adapter.
Why use ISDN?
How ISDN allows multiple devices to share a single line?
How the B and D channels share the line?
What the B and D channels do?
How to Establish the Link Layer?
What is the Frame Format ?
How Analogue fax and modem over ISDN?
What protocols are used?