A DSL connection is not "asynchronous". It's asymmetrical, which means upstream and downstream bandwidths are different. Asynchronous is what was commonly used in the old serial ports, as connected to modems, teletypes, etc.. These ports used start & stop bits to indicate when the character started and stopped. All modern communications is synchronous, including DSL, and derives the clocking from the signal. BTW, a T1 or DS1 is 1.544 Mb/s, not 1.5.. Analog lines were used for trunks long before SIP or even TDM digital trunks. Old telecom guy here, going back to 1972.
I found this oldie but goodie today, and it helped me tremendously! I work as a MS Teams Support Engineer and wanted a better basic understanding of SIP Trunking. Thank you!
Just to clarify, a T-1 with the same upload/download speed is considered symmetrical, not synchronous and a DSL or Cable connection with different upload/download speeds is asymmetrical, not asynchronous.
@@lokeshlawania4768 Symmetrical means the bandwidth is the same in both directions. Synchronous refers to the clock or timing of the signal. Synchronous signals derivie the clock from the signal and it often comes from some standard source. Asynchronous means each character uses a start and stop bit to denote each character.
Great explanation. Two questions though: Does the ITSP have to be in the same country as the local phone numbers? Based on that, if you want a presence in more than one country, would you then have multiple ITSPs?
QOS doesn't exist on the internet, yes, the voip packets will be put on the wire first, but the QOS tagging is dropped/ignored at the first hop. Very misleading.
That's very correct, however it is possible to have QOS tagging from your ISP. This is why we have such a strong SIP trunk solution as we are both ISP and ITSP at the company I work for. So we can basically offer SIP trunking over our backbone. This way, the packets will be prioritized the whole way. Most (big) costumers choose this solution nowadays. Running optical fiber as main and coax as standby (or DSL as standby, different ISP thus more redundant). But you are still right that when it has to go over the internet or pstn the QOS tagging will be ignored at some point.
Please is it advisable to subscribe for a SIP Trunk Service online, outside my country? I'm asking this because I can't seem to find any good ITSP in my country!
I realize this is an old video, but the explanation about DSL needs to be corrected. There is no such thing as DSL. It is either ADSL or SDSL. ADSL has different down and upload speeds. SDSL has the same speed down and up.
And yet, they are all digital subscriber line technology... I think their abbreviation is perfectly accurate and sufficient for the context. Nice nitpicking!
shellite As it is wrong, it is nott accurate. The video compares T1 and DSL and makes a point of the "fact" that T1 is synchronous while DSL is not. This is misleading as you can get SDSL that is multiple times faster that T1. Of course, today you would go for optical fiber... Nitpicking? Not when it is wrong and misleading. But as this is old anyway, I guess it does not matter much. Have a great day!
A DSL connection is not "asynchronous". It's asymmetrical, which means upstream and downstream bandwidths are different. Asynchronous is what was commonly used in the old serial ports, as connected to modems, teletypes, etc.. These ports used start & stop bits to indicate when the character started and stopped. All modern communications is synchronous, including DSL, and derives the clocking from the signal. BTW, a T1 or DS1 is 1.544 Mb/s, not 1.5..
Analog lines were used for trunks long before SIP or even TDM digital trunks.
Old telecom guy here, going back to 1972.
I found this oldie but goodie today, and it helped me tremendously! I work as a MS Teams Support Engineer and wanted a better basic understanding of SIP Trunking. Thank you!
Straightforward clarity-filled explanation. Thank you, sir!
Just to clarify, a T-1 with the same upload/download speed is considered symmetrical, not synchronous and a DSL or Cable connection with different upload/download speeds is asymmetrical, not asynchronous.
can you explain the reason and difference bw symmetrical and synchronous and
@@lokeshlawania4768 Symmetrical means the bandwidth is the same in both directions. Synchronous refers to the clock or timing of the signal. Synchronous signals derivie the clock from the signal and it often comes from some standard source. Asynchronous means each character uses a start and stop bit to denote each character.
thats the best explanation ever. im currently a Telecom Specialist and this helps me a lot
Thanks mate...this was the greatest explanation of SIP trunking ive seen.
Quite simple in your approach. I like it even as an old Techie.
Nice 'high-level' explanation of SIP technologies for Telecom.
Pretty nice, well thought of, and simple explanations.
Very well explained. Thank you.
this was very helpful thank you very much !!
Great explanation.
Two questions though:
Does the ITSP have to be in the same country as the local phone numbers?
Based on that, if you want a presence in more than one country, would you then have multiple ITSPs?
Love the Intro Music !
He is a GEM!
this tune makes me think of the old game, Transport Tycoon :-)
Excellent explanation!
Thank you.
Thanks for the explanation old boy.
Well done.
What happened to Arun Honda, and the intellinet?
QOS doesn't exist on the internet, yes, the voip packets will be put on the wire first, but the QOS tagging is dropped/ignored at the first hop. Very misleading.
That's very correct, however it is possible to have QOS tagging from your ISP. This is why we have such a strong SIP trunk solution as we are both ISP and ITSP at the company I work for. So we can basically offer SIP trunking over our backbone. This way, the packets will be prioritized the whole way. Most (big) costumers choose this solution nowadays. Running optical fiber as main and coax as standby (or DSL as standby, different ISP thus more redundant). But you are still right that when it has to go over the internet or pstn the QOS tagging will be ignored at some point.
VIDEO IS 7 YEARS OLD, DOES THIS STILL WORK WITH GOOGLE VOICE?
Best Explained. Thank You #wavetellimited
well explained .Thank you :)
Please is it advisable to subscribe for a SIP Trunk Service online, outside my country?
I'm asking this because I can't seem to find any good ITSP in my country!
thanks for the explanation
Great video, thanks!
Whats with the old school porn music in the intro?
I realize this is an old video, but the explanation about DSL needs to be corrected. There is no such thing as DSL. It is either ADSL or SDSL. ADSL has different down and upload speeds. SDSL has the same speed down and up.
And yet, they are all digital subscriber line technology... I think their abbreviation is perfectly accurate and sufficient for the context. Nice nitpicking!
shellite As it is wrong, it is nott accurate. The video compares T1 and DSL and makes a point of the "fact" that T1 is synchronous while DSL is not. This is misleading as you can get SDSL that is multiple times faster that T1. Of course, today you would go for optical fiber... Nitpicking? Not when it is wrong and misleading. But as this is old anyway, I guess it does not matter much. Have a great day!
DSL just means Digital Subscriber Line. That line can be either symmetrical or asymmetrical.
@@SveinWisnaes While a T1 is synchronous, it is also symmetrical. ADSL is also synchronous, but is not symmetrical.
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