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02-03-2013 05:49 PM - edited 03-04-2019 06:55 PM
In my Accessing the WAN book, it says "HDLC uses synchronous serial transmission to provide error-free communition between 2 points". And on Wikipedia it says "HDLC frames can be transmitted over synchronous or asynchronous links". So does HDLC use synchronous or asynchronous transmission?? Thank you.
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02-03-2013 07:51 PM
HDLC can be used on both synchronous and asynchronous links. Your book is likely specifying how the protocol is used on a standard WAN link (is DS3 or T1) in which case both of these links are synchronous. There are other implementations of HDLC though that is used across asynchronous links. I believe wiki is accounting for all uses and your book is tar getting common usage on a WAN circuit.
Toby
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02-03-2013 07:51 PM
HDLC can be used on both synchronous and asynchronous links. Your book is likely specifying how the protocol is used on a standard WAN link (is DS3 or T1) in which case both of these links are synchronous. There are other implementations of HDLC though that is used across asynchronous links. I believe wiki is accounting for all uses and your book is tar getting common usage on a WAN circuit.
Toby
Sent from Cisco Technical Support Android App
Please don't forget to rate any helpful post.
_____________________________________
There are no great limits to growth because there are no limits of human intelligence, imagination, and wonder.
- Ronald Reagan
