16.5. WAN Protocols
The technologies I'm going to focus on in this section are as follows:
ISDN
Frame Relay
ATM
MPLS
16.5.1. Integrated Services Digital Network (ISDN)
ISDN is a digital, point-to-point WAN technology capable of maximum transmission speeds of about 2Mbps (Primary Rate Interface [PRI]), although speeds of 128Kbps (Basic Rate Interface [BRI]) are more common in a SOHO environment.
Because it's capable of much higher data rates at a relatively low cost, ISDN is becoming a viable remote-user connection method—especially for those who work out of their homes. ISDN uses the same UTP wiring as POTS, yet it can transmit data at much higher speeds. But that's where the similarity ends. What makes ISDN different from a regular POTS line ...
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