PSTN - Public Switched Telephone Network

Today my topic is Public Switched Telephone System, or PSTN. PSTN is a century-old worldwide connected telephone network. The PSTN topology and class level might be different in different countries but the original design was only for circuit switching analog telephone calls.
Nowadays, the backbone of the PSTN is mostly digital, and most local loops are still using analog technologies.
In terms of physical media, PSTN is a mix of copper wires, cables, fiber optics, and wireless. PSTN forms a basic foundation and a very important part in the infrastructure of WAN technologies.
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Sunny Classroom

[@WanderingWassoms]

You're a VERY good Teacher! Thank you, Sunny!

[@susanasher6939]

Thank you so much for this great video! I need to understand this to write about it for my company, yet no one at the company has provided a clear explanation to me what the PSTN is. This is such a great explanation. You are one of the truly wonderful technology teachers on the internet because you have simplified this so that a fifth-grader could understand it. Thank you!

[@dreamscapeai7]

Thank you man, I understood PSTN from you better than my university teacher.

[@sunnyclassroom24]

You are welcome, KnightEx!

[@ihateyourusernames]

Awesome video explaining fundamental PSTN concepts. The slideshow in the middle about signaling is pretty funny also.

[@billpotter7162]

Great teaching tool and explained in easy terms. Good job!

[@sunnyclassroom24]

thanks.

[@habibullahmasrur8996]

The best qualities of sir is making things simplified 😇😇
Your lecture are way better than my class lecturer 🤣🤣🤣

[@ravichanderb608]

Excellent video i was unable to understand it but u clearly visualized what is PSTN.Thanks alot sunny.

[@srb1855]

Sunny, very informative video-and vey funny!😂

[@Zigoo0]

Very nice way of explaining the design and how it works. Also liked the video editing and jokes too :)

[@beeforreal9249]

I love You sunny. You are hilarious while teaching so perfectly.

[@MIG95374]

Great video! I had to grasp the basics of PSTN for a job interview and you explained it really well.

[@sunnyclassroom24]

Glad you enjoyed it!

[@rajveervarma7431]

@@sunnyclassroom24 could you please mail me this presentation

[@ahashef]

Now, while passing my N10-007 I'll associate Sunny's pictures to PSTN, the best way to remind something xD
Perfect videos!

[@satkunanathansutharshan6574]

within small time period , how can you explain what we expect ,Amazing lecturer forever ..! Thanks Mr.Sunny

[@toasttoni]

omigod thank you for this i wouldn't be able to do this without you

[@TheBleyach]

Great video, sir! Thanks a lot. :)

[@sunnyclassroom24]

you are welcome!

[@wisdomjere6700]

Thanks for this

[@renuebranoz4350]

Thank you soo much sir i strugle with these again
thank you soo much

[@GabrielGongoraNavarrete]

Gracias, explicado muy claramente

[@ballstaedt23]

thank you!

[@btreaction639]

Thanks for helps

[@IZyerortukleri]

Thank you so much for this great video!
I look you from Azerbaijan

[@sunnyclassroom24]

Thanks for watching!

[@TRS-Tech]

A couple of very important questions I would love to put to Openreach...
1. I assume if you are offering PSTN to VOIP devices so the dialtone is emulated locally then you will be providing battery backup to enable emergency services calls in the event of a local power outage. Who exactly will be paying for the external battery pack or internal pack in the modems ? If this is the service provider that cost is going to be passed on to the end user. A cost that has always been covered by Openreach in the past with FTTP for example. Who is going to be paying for the equipment to keep a service that has always been a core responsibility of Openreach in the past. Regardless of the method employed Openreach are still responsible for the path from the customer NTE to the MDF.... or directly into the 21CN backbone in the case of direct IP / VOIP services.
2. I assume that unless fully LLU the core of current PSTN users can look forward to huge reductions in call rates and line rentals given that providing a VOIP service is substantially cheaper than a POTS line... No line cards and a large reduction in equipment power consumption at the exchange for example will result in huge ongoing cost savings for Openreach once the equipment change at the exchange is complete, a process that was well underway 14 years ago when I retired as a PTO / SFI engineer.
Openreach appear to be trying to act the poor victim when this very long overdue switchover was announced and are complaining about bandwidth usage on the backhaul network. As anyone in the industry will tell you Openreach have been trying to prolong the usage of old slow creaking backhaul links to keep the profits rolling in rather than investing in backhaul links, FTTP and actually blowing new fibres and upgrading modems and switches to cope with an ever expanding increase in traffic. It does make you wonder what network latency will be like when all this additional VOIP traffic bogs down the existing antiquated links. My estimation is that overall latency will increase (something that voip services do not like very much) whilst service providers are left to cover the cost of additional or replacement equipment. As I cannot see directors and shareholders buffering these costs it is going to be the end user that suffers in the end.
This is something that has been on the cards for many years. It is NOT something that has suddenly and without warning been dumped in the lap of Openreach to sort out.
It is looking like the stopgap solution to this self inflicted disaster is to try and shift as much traffic as possible onto mobile network operators who will sooner or later hit the same problem wall that Openreach is shortly going to slam into...
.................
We have an underfunded and under invested network backbone that is not going to be fixed by calling Scotty in engineering and asking for more power to the shields !
If I ever doubted the existence of Karma for corporate bigwigs and greedy investors I am sure that leaning back with my popcorn and watching these people tread water that is up to neck level for the next few years will fully restore my faith in this phenomenon !!
Meanwhile I have two empty baked bean tins and a length of string on standby and ready to go. ☺ 😂

[@habibullahmasrur8996]

Thanks Sir 🙏👍😊
Priceless lecture 😊
Something which money can't buy or
Something beyond money 💰🥰
I appreciate your hard work from the bottom of my heart ❤️💝

[@sunnyclassroom24]

All the best

[@siddharthsingh5937]

Love from India🇮🇳🇮🇳

[@dohaaymoon4096]

Thankuuuuu

[@PETAJOULE543]

Great video... I believe this explains why international phone calls to another person in other country with normal phone is expensive (have to use class 1 phone links)

[@wadzanaithelmamasendu9694]

Thank you so much Sir Sunny.iam trying to differentiate tandem exchange from transit exchange pliz help

[@suryateja2.062]

Your brief explanation is pretty cool. Could you please elaborate it more in some other video

[@sunnyclassroom24]

Thank you for watching! check out my other videos please!

[@MyGardenForYou]

PSTN stands for Public Switched Telephone Network but in the video it says Public Switched Telephone System.

[@mekonengirmay9002]

Nice video

[@sunnyclassroom24]

Thanks.

[@sirajtanoli8682]

please make a video in which we can differentiate between PTN & OTN

[@oz12353]

i love phone hack

[@jainishpandya4246]

play in 1.5x to save time

[@qudrat_ullah3000]

sir can you Share these PPT sir

[@user-tv7ec6fc5h]

peepeeexx xD

[@ArjunSingh-wz3eq]

chun chu cha chun chana