I have some questions about HDLC and WAN protocols.
Is HDLC via serial interface between router and mainframe? and between router and
router?
If HDLC is done between router to router, is it over WAN using POTS?
Do WAN technologies such as Frame Relay, X.25, HDLC and ATM networks use POTS?
Thanks you for any info.
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Oscar Rau
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