Introduction to Telephone Systems

[@josesoarezz5780]

I just wanna say that you are such a GREAT teacher! I'm from Angola (Africa) and right now I'm studying in China. Your videos helps me a lot! Sharing is caring, so thank you so much for caring :) God bless you!

[@HK-sw3vi]

@@hotshotmarketer194 fuck outta here

[@Pdemosllegaralosanti-tiktokers]

_*"I AM TOTALLY SURE THAT THE PERSON WHO STOPPED TO READ THIS MESSAGE WILL BE SUCCESSFUL IN EVERYTHING HE DOES"* 🥺

[@juliamhayes]

One hour ago I didn't understand PSTN, PBX or the separateness of voicemail. You are a master communicator Eli. Thanks very much for this lesson.

[@africanchina1]

9:37 Trunk Lines 19:04 The phone system 26:35 Stations 29:44 Analog vs Digital

[@itpugil]

+africanchina1 thanks for the indexing! :)

[@brandonfarfan1978]

Thanks dude.👍

[@erybatoarung2789]

Thanks sir

[@hotshotmarketer194]

best VoIP solution with contractless and flexible installation voip.expertideas.tech/

[@Pdemosllegaralosanti-tiktokers]

NO MÁS TIKT0K 😠😠😠😠🙄

[@jlaw2288]

10 years later, concept still the same. Great video for beginner understanding of PBX. I will recommend this video to anyone who knows nothing about phone system and want to learn the concept.

[@TheDesertStorming]

rarely see information given for free anymore , your a blessing

[@boxer12350]

*you're

[@JohnSmith-hj8kv]

Wikipedia?

[@Pdemosllegaralosanti-tiktokers]

NO MÁS TIKT0K 😠😠😠😠🙄

[@Pdemosllegaralosanti-tiktokers]

NO MÁS TIKT0K 😠😠😠😠🙄

[@bonganibunu5171]

This is the best lecturer on technologies i have ever come across.

[@pdpUU]

Exactly what I needed for a new job from a repeat client! It was for a phone + networking audit/survey - I had only brief background on phone prior, this video caught me up to speed perfectly.

[@3jalil]

Eli I must say that you are not only a genius but a very good teacher, very few people can explain things as you do!

[@423tech]

A few quick corrections I feel I should point out. A PBX is a Private Branch Exchange, or a dedicated central office (usually around 500 to more than 1,000 extensions) that large enterprises use. A Key System is one of the smaller telephone systems used by business with less than 500 telephones. NADP = No, it's the North American Numbering Plan, or NANP. In addition, I should point out that the NANP is just the numbering format standard, and not the way calls are routed. Calls are routed using Signaling System Number 7, or SS7, which is a protocol which central offices use to communicate. They use out of band data to transmit information such as the destination number, caller ID information, et cetera. The average central office in a small town serves about 5,000 lines.

[@johnoman6617]

telecomguy10: Also, no phone systems are not always easy to work on. There is more than just the $600 system this guy is used too. All Dmarcs on the outside of the building? Only is someone is not doing their job. Got about halfway through, couldn't stand any more. I was curious if he knew what PBX even stood for.

[@utkarshmishra1928]

Eli, I can't thank you enough for providing such a quality and insightful content for free. I was struggling for a long time to understand voice communication and then i stumbled upon your video series, and then i have been binge-watching it from then on. Once again, thanks a lot!!

[@fgwaller]

One small Comment about Trunk lines. What you describe is the operation of Analog lines, however even in the US for connecting a PBX digital Lines are more common. One of the Advantages of digital lines is that you do not have to setup huntgroups or alike with your carrier anymore. With ISDN and T1 lines a part of the bandwidth is reserved to communicate the called number, callerid, which of the connected channels the call is going to use, etc. This allows more settings to be made on site.

[@Abijossy]

I must say this, this is how to teach. Clarity, aim, purpose, delivering all top notch. You are the bomb🎉🎉🎉

[@itpugil]

i got hired and was asked to study about "asterisk" but i had trouble understanding what PBX's and PSTN's are because no video here in youtube could explain it, was really happy to run into this class, always loved watching his contents thank you so much eli even back then when i was in college i run towards your videos for help! :)

[@mikegigliotti5601]

I'm an electrical engineer from pa. A college classmate and I started a electrical construction company and we recently ran into a telephone problem and we quickly realized in our extensive studies we knew nothing about phone system thanks to this video I was able to save the day thanks..great video

[@alexilaiho8534]

Hello Eli, just stop by to say thank you! I watched this video before when I'm about to take my telephony class and it gave me a jump start. Although it is not the entirety, still it help me a lot and because of it I got 3.5 in my telephony class. I think its almost 2 years ago. Now I am an engineer, so thank you and continue making up video and being passionate about it!

[@clintonbeckway4171]

This Eli the computer guy needs tobe cloned and sent to every Technical college and uni around the world, I have learnt alot and he puts things in an easy to understand way. Good work keep on Teaching ! Now if only I can find someone as good as him to teach me Maths !

[@jitukali2652]

Clinton Beckway I agree with you.

[@sportsspot8181]

Plz add types of wireless telephone system topic

[@midnytemyst79]

I am a network engineer and voice is like speaking latin almost, but you have made alot of the technology make sense to me and I appreciate that. Keep doing great work.

[@elithecomputerguy]

@xofuoy The "lines", Trunk Lines, represent how many concurrent calls that can be going on between people inside the building and phones outside the building. So if 4 people are on calls with people OUTSIDE the building when the 5th person tries to call OUT the call will fail (They may get a fast busy signal, or something else.) If on the other hand you have 6 people talking to other people INSIDE the building then when a person tries to call out they will be able to.

[@GK-cj6tq]

Don't think I have ever seen a video on technology so easily explained.Can't​ thank you enough!!

[@StatsSweeney]

ELi, great video. I was forced to change careers and got 'hooked' up with a voice and data company. These videos have helped me to understand on a deeper level something i took for granted. They are also helping me to get on my feet with the new job. Keep them coming!!!

[@spiffai]

You rock dude! I work for a communications company and nobody can explain these concepts as well as you do. Keep being awesome! I'm going to watch all of your videos like a rabid fan girl.

[@kennyflores4327]

You the man Eli! Im attending ITT Tech for my bachelors in information systems and cyber security and your videos are very helpful along the way. Keep em coming!

[@omskariyazmaraikayer913]

Dear Eli I been watching some of your videos . Their extremely good. Its time I thanked you . Sir.

[@medpinlondon]

Thank you so much, man. I joined a company for an IT position, and being a new bee to IT Industry, i was struggling to know the SIP Trunk concept. Now I am clear, thank you for your help!

[@MrMuralikrishna1982]

for not only these videos, i have got addicted to all your training sessions. Specially the Linux training programs which helped me to the core. More than knowledge on Linux, you have given me the confidence and made me to realize that linux is not a big deal. Thanks a ton !!

[@mariagholston2379]

I thank you so much, for your wisdom and time explaining the basics for which we have learned. I'm trying to figure out how to make our small business work smoothly. We need to purchase phones without over spending. Thanks for the good work 👏

[@laraphzglobaltechnology5621]

First lecture on telephone system. I love it, very comprehensive. You re a great teacher.

[@PBC66]

ADSL is effectively "piggybacked" onto a standard line and filtered at your premises. So if installed properly, the regular telephone side of the connection can be used for anything that a non-ADSL telephone line can be used for, including fax or dial-up computer access.

[@TheTechieTube]

Probably the most informative and easy to comprehend computer techie site on the net. Thanks Eli for sharing your knowledge.

[@sblove99]

Got a better understanding of PBX here in 45 minutes here than I have 6 months on job... Great vid!

[@squirrel1620]

Great video. I was just hired at a company that has a lot of legacy gear attached to a hydro electric pump, I needed some insight to the job before I started so thank you! I know ethernet like the back of my hand but had no knowledge of phone systems

[@stavrosstamatakis]

Such a simple and jargon free language... If only all teaching was done like that. Excellent job Eli

[@dangelor]

This video was SO helpful as I'm preparing to administer our Lync 2010 environement and have had no experience with the voice side of things. Thanks so much!

[@jolinlee7161]

10 years later. It is still relevant.

[@Thebigjosh233]

Yes sir

[@cottonfield2580]

Fantastic way to educate people interested in technology.

[@maneeshkumarmuralidhar7713]

Great Tutorial, I see huge patience form the Teacher in explainaton. Thank You

[@theguyatx8225]

I can't even begin to tell you how helpful this video is. Thanks for posting it, I'm looking forward to watching the rest of your videos.

[@TelNetVA]

Eli ... love what you are doing with you video series. As a "phone guy" myself I appreciate you reaching out to educate others in our industry.

[@hotshotmarketer194]

best VoIP solution with contractless and flexible installation voip.expertideas.tech/

[@AritraChattoraj]

how can in the world a man has sooo clear concept on what he says... excellent.. If I would be a teacher some day.. I would love to copy ELI. it helps students who are low meritorious just like me..

[@Ha-ma2627]

Here to refresh my mind, and This is such a simple, clear, concise way of explaining this overall topic. Not only does he takes his sweet time with each topic but he also explains it a few different ways to get the point across… keep it up!

[@geoalm2015]

I just want to say that this was a great intro video session. Awesome job Eli! Keep doing what you are doing. You have a gift of explaining technical material in ways for others to grasp easily. Thank you.

[@HamzaAbbas_]

One of the best explanations of telephones systems i've heard. It's always been a mystery to me and you explain it in an easy to understand way.

[@Peter95111]

awesome. I've worked for a telecommunications company for 6 months now and I've learned so much from this.thanks!

[@Uniquelife_17]

one of the great teacher on youtube.. I am biggest fan of your powerful presentation....very informative video may god bless you...

[@popeyejones1]

Sir, I am looking at this as a new career. Thanks for being informative and fun. I am only half way through, and am having a nerdgasm! Screw the haters, some of us want to be constantly learning... Awesome job dude!

[@LuckyConnections]

You are doing Great job without any Greedness of Money! Knowledge is Power!

[@123456iambelial]

I am studying for CCNA Voice, and this video clears a lot of missing information. I subscribed! Thank you sir.

[@kulemandev7363]

this is the first video of you that i'm watching. man i just realize i need to subscribe right NOW. THANK U YOU ARE GREAT!

[@bexwilson9789]

I've just started a new job at a telecoms company and found this really useful!! I am going to watch the VoIP and the other videos you've done!! Cheers

[@jamesholder1703]

I would have to agree and say that you truly are a great teacher! I am glad I found you here, keep teaching and I will definitely keep learning, you make it very easy!

[@ammroz1]

You are Great Really you are best tutor I'v Listen to..Again thx for sharing knowledge..I Have been in Asterisk about 2 years and I was having some misconception and u have cleared it All.

[@flagoman]

thank you for taking the time for all this explanation, really grateful for all this info..

[@alwynwil]

Eli is the best pressenter i ever been watched on youtube, you are the best, thanks for such a cristal clear language and explanation, i think one view i got everything u said, Keep up the good work.

[@GOAVOXI]

Once again Eli provides a information video that this time describes what we need to know when it come phones.

[@Oldgoat38]

Thanks Eli. I appreciate the detail in your talks. I needed this series of talks.

[@ElLiso2011]

Eli is the best teacher. Is amazing how he can explain things very well. Thanks man!!! You’re doing a great job.

[@aniruddh01afterburn]

Hats off to your in depth knowledge .... Learned a lot ....Thanks a Lot for sharing your knowledge in such an easy to understand process... Great

[@onlyben911]

i really enjoy all your videos. my 1st ever best teacher

[@ankitchauhan2791]

Thanks a lot Eli, you explain the topics from scratch. Perfect for beginners!!

[@DarioDeSantis]

Eli, you rock! You saved me hours of pain to find all those info and wisdom!

[@verybrowndude]

Very well explained. One can give a lecture on basics after watching it. Thumbs up.

[@davekrasmussen]

One way to look at the PBX and Voicemail is to consider the PBX as a router, and the voice mail as an "audio server" for the system

[@PBC66]

Re "Every single trunk has to have its own phone number." At one time with many electromechanical central offices that was the case, but it's not true these days. It's possible to have a multi-line hunt group set up with only a single telephone number.

[@springflowerangel]

I've been for long confused about trunk line, hunt groups, PBX, and voice mail system, now I understand it, Thanks!

[@aidavali9307]

this is great. thank youuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu so much. you are an amazing teacher. i am international student and struggle with concepts as long as with language. but you explain everything perfectly with simple language and I understand the whole. thank you so muchchchchchchcch

[@jonaslabodlay5919]

I just saw your video and it was well explained. Thank you so much for this amazing video tutorial! I hope your channel get more subscribers because of this. God bless you!

[@alexblack849]

Great and easy to understand introduction to Telephone System! Thumbs up !

[@bloonexy3261]

You're correct,, but only in part.. Trunks are used for that. But other places as well. It's like hearing a Toyota is a car and thinking all cars are Toyotas.. Trunks are used for more things than just that. But they all do go back to a CO, even if the CO is local, and not leading directly back to the Service-in. Or so it can be also.

[@AlwaysLyceum]

Wow, Eli! You are so great at explaining this stuff! I have a new interest in business telephone systems myself and this was a great overview! I have decided to be the goto guy in my office for anything dealing with our Avaya phone system and our voicemail system.

[@hyperacusisPH]

Thank you Eli! Keep helping the tech community.

[@willb169]

I now am a tad less clueless about phones than before :-) Thanks! When I was totally green and still wet behind the ears, I worked for a company that had some old ugly looking menu driven interface for their PBX or VM. It was a HUGE company and only 1 solitary IT guy handled all phone tickets. Obviously he was worth his weight in gold and his job security was fairly untouchable...

[@mmcontrol]

So using PBX is for reducing the cost by not routing the call to the pstn . and about ur question suppose u have a hotel with 50 phones 49 for clients (in the rooms) and one for the front desk or hotel services means the clients will not dial an outside number(their ho,e number ,friends,etc) from the hotel phone but sure the front desk phone needs to call to other hotels or resturants or any other phone outside the hotel(1 trunk line for outside and 49 don't need trunks)

[@rustleraw]

This really is allot of information for one video but you did a good job of simplifying the technology and its role.

[@erasch891]

You are a very good teacher, Eli. Keep up the good work. Your explanations are fantastic and easy to comprehend.

[@elithecomputerguy]

essentially the answer is "yes"... With that size environment you start dealing with different technology but for all intents and purposes the concept stays the same...

[@anthonyilosvay5595]

Great tutorial. Thanks for doing this, you've just decreased the severity of my learning curve in my new role. Much appreciated.

[@WilliamGonzalez-nc8pg]

Hi I really apreciate all the effort you do to make this tutorials, i like how clear and understandable explain all the topics. i work in one of the many english call center's in Guatemala City so all this information will be hepfull. grettings from Guatemala City . If any body want's to know more about uor coutry search for "guatemala beautiful"

[@gsueagle04]

Thank you Eli for for taking the time to make this video. I am taking a Telecommunications and Data Cabling class in college. I am looking forward to the other classes.

[@TrafficFeed]

Informative! VOIP and 4 years fast forward and ton of companies with virtually free services...

[@denniswilson2719]

Very educational video. You explain things in a way that makes the content very easy to understand. I look forward to watching your other videos.

[@real.Life.Stories]

Eli is the best when it come to this, keep producing videos man....thanx!

[@norbertrivera]

Very nice explanation,thanks for share.

[@xxmlhedxx]

being a phone man myself... im impressed.. very well done!! :)

[@TheDecoyroy]

For UK people, the lines coming in are normally ISDN lines, for each set of lines we would use ISDN lines, each line in has 2 channels, 1 in and one out, or 2 in or 2 out. Some use 4 ISDN in the same way.

[@oktoframe]

amazing tutorial . i like all the tutorials you have posted, as they are easy to understand and relate to for someone who is new to certain topicx /technologies.....thanks agan...god bless

[@aboood8111]

Eli you are better than my University lecturer

[@ezzadinhausawi5813]

Eli the genuine, you are doing great favor for so many people I am sure whoever watch your video will blessed you. What is PBX? Where it should be? How to program the stuff on it? So many thing I think later we wiil figure it out

[@GrgRocky2011]

This guys knows all things.. keep it up..

[@EdsterL]

dude you are amazing...cant believe how easy you make to understand, instead subscriber.

[@JeremiahONeal-t8y]

@26:09 I've actually messed around with pbx/vm systems even though that's not my area. Basically the vm system I've used is basically a computer with multiple voice cards (think modem cards you'd use to call AOL). There were about 8 lines coming out of the PBX into the computer running IBM's OS2 operating system. Anyway, it's easier to understand if you've seed an actual setup.

[@Dee_DoDirty_Tyler]

Great refresher and preparation with new technology explanation for my interview tomorrow!!!

[@AugustusOakstar]

Well delivered, good summaries, I love your easy teaching style, someday this information will be added to the history of subscriber trunk dialing. Can't see anything negative about that!

[@n.rakesh3260]

Dear Mr.Eli, thank you so much you presentation on VoIP,VPN and Basic on telephone system was helpful and gave me an clear scenario who the communication establishes.. Regards N.Rakesh

[@kingscobo4415]

Thanks Eli....that was awesome lesson,Be blessed

[@krishnamahato3808]

i'm a student of coomunication brancht.this video is just awesome,great job ali and keep uploading

[@afettouche]

Eli, you are great ! it's very clear for me. I like the way you're teaching thank you

[@TRS-Tech]

A couple of very important questions I would love to put to Openreach in the UK when all lines go digital ! 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. ☺ 😂

[@MEX1NA2H]

Whatching this in 2020!! really awesome way to teach!

[@efeshenem18]

amazing video. thank you so much. well explained and I fully understood it. you're the best teacher.

[@anotheruser3679]

Here in 2023. Thank you very much. Quite insightful. Had to subscribe noting that I need to study alot of Telecom stuff in these two months