How the structures of BRI and PRI compare
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What protocols are used?
Number of devices equals number of subscriber numbers required for MSN - true or false?
Why use ISDN?
What kind of cabling is used for a PRI?
What do the layers look like?
What the B and D channels do?
What is Soft-fax and Soft-modem?
If two ISDN channels are used together, each connecting the same pair of users, how many calls are being made?
What is the significance of the TEI in B channel communication?
Where does this conversion normally take place?
What is LAP-D?
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.
WiFi Protocols 
