Been watching your videos from the early days of Winterpark Tech, You are a truly gifted teacher with great insight and very good flow. I am using these videos to keep me refreshed on 7L OSI. Since we mainly administer office 365 and Azure I sort of lost touch with hands-on networking.
Always glad to hear from long time channel viewers, hope we can continue to be a part that helps you keep technically sharp! Thanks for the comment and for watching.
Thanks for the great video, For the OC-768 in SONET. Was it sent over 1 optical carrier (wavelength)?, can I assume that maximum TDM bit rate was 40G over a single carrier?
The wavelength was 1530 - 1565nm. SONET/SDH were TDM networks and capped to 40Gbps (OC768 / STM-256). See a great PDF from Cisco Live: www.ciscolive.com/c/dam/r/ciscolive/us/docs/2017/pdf/BRKOPT-1001.pdf
If SONET/SDH is a layer 1 technology, why is there a SONET frame? If a specific SONET frame was defined, doesn't that mean SONET is also a layer 2 technology?
Thanks for a decade of these videos. @3:30 MPLS is not layer-2. It's somewhere between 2 and 3, but isn't either. (I can't set the encapsulation of a serial interface to MPLS.) If you follow the history, the purpose was to make traffic routing faster. (to me, it's a lot like frame-relay) @4:10 Heh. While you can order something that will be called a T1, it's not. At the customer ends, it will look like a T1. From the smartjack back to the network, it's almost always some flavor of HDSL. [pictured @10:50] (cheaper, one pair vs. two, etc.) Within the carrier network, who knows. (ATM used to be popular, but the world doesn't really do TDM anymore. Everything is IP/Ethernet these days.) [ANSI-T1.403 was originally defined in 1989, so 31 years old!] @10:50 That's a T1 smartjack. I can email a picture of one that I assume is SONET -- fiber in, coax DS3 out. @27:55 An "RG" would be the Uverse VoIP method. _POTS_ + DSL will install a filter to keep the low frequency voice and high frequency DSL away from each other. That will either be with a "whole home" filter, or a bunch of point-of-use filters at each phone. (google "dsl pots filter" for images. I still have bags of 'em.) [POTS is a dead/dying tech these days. No one wants to maintain the aging copper plant.] @29:00 DSL networks are usually data (IP) only. Any voice will not be via ATM at this point. POTS is analog all the way back to the switch at the CO. [One of the DSLAMs I worked with -- Copper Mountain -- did support a voice pvc over DSL, but I never knew anyone who used it. As I recall, even their modems didn't support it.]
