What is Fractional PRI?
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How users are connected to a public ISDN through an ISPBX?
A user on an ISPBX can use different D-Channel protocols to those in use by the public ISDN network connected to the ISPBX - true or false?
What are TEIs?
What kind of cabling is used for a PRI?
How to Establish the Link Layer?
What must each SETUP message contain?
What other method is there for converting synchronous and asynchronous data?
What are SPIDs?
If none of the equipment connected to an NT1 requires a power supply through the interface, do I need to attach the NT1 to the mains?
What are ISDN Services?
What protocols are used?
How configuration errors in the ISPBX can prevent successful connections?