Watch in full quality: https://www.teracomtraining.com/online-courses.htm#2201
Course 2201 The PSTN: Loops and Trunks • POTS • Circuit-Switching • LECs, CLECs and IXCs • Analog • Voiceband • DTMF • SS7
One cornerstone of a full, rounded base of knowledge of telecommunications is the structure and operation of the Public Switched Telephone Network, built over the past 135 years, still in operation in every country on earth – knowledge necessary for connecting the PSTN to, and steadily replacing the PSTN with IP telecom technologies.
In this course, you’ll build a solid understanding of the fundamentals of the telephone system: Customer Premise and Central Office, loops, trunks, remotes, circuit switching and how a telephone call is connected end-to-end. We’ll cover LECs, CLECs and IXCs, sound, analog and the voiceband, twisted pair, DTMF and SS7. Updated for the 2020s.
2. History of Telecommunications (USA and Canada)
3. The Public Switched Telephone Network (PSTN)
4. Analog Circuits and Sound
5. The Voiceband
6. Plain Ordinary Telephone Service (POTS)
7. Signaling: Pulse Dialing and Dual Tone Multiple Frequency (DTMF)
8. Signaling System 7 (SS7)
Based on Teracom’s famous Course 101, tuned and refined over the course of more than 20 years of instructor-led training, we’ll cut through the jargon to demystify telephony and the telephone system, explaining the jargon and buzzwords, the underlying ideas, and how it all works together… in plain English.
Featuring many photos of actual equipment both inside a Central Office and in the outside plant, this multimedia course is an excellent way to get up to speed on traditional telephony.
In this online telecommunications course, we begin with a history lesson, understanding how and why telephone networks and the companies that provide them are organized into local access and inter-city transmission, or as we will see, Local Exchange Carriers (LECs) and Inter-Exchange Carriers (IXCs).
Then we will establish a basic model for the PSTN and understand its main components: Customer Premise, Central Office, loop, trunk, outside plant, circuit switching, attenuation, loop length, remotes, and why knowledge of the characteristics of the loop remains essential knowledge even though we are moving to Voice over IP.
Next, we’ll cover aspects of telephony and Plain Ordinary Telephone Service, including analog, the voiceband, twisted pair, supervision and signaling including DTMF. The course is completed with an overview of SS7, the control system for the telephone network in the US and Canada.
What You Will Learn
On completion of this telecommunications course online, you will be able to draw a model of the Public Switched Telephone Network, explain its core-and-edge architecture, identify components and technologies, along with the big picture, including:
– Why telecom networks are divided into local access wiring and long-distance transmission
– The founding, breakup and re-emergence of AT&T in the US; TELUS and Bell in Canada
– A basic model for the PSTN and its main components
– Loops, why they are called loops and why there is a maximum loop length
– The outside plant
– Central Office and Customer Premise
– How and why remotes are used; fiber to the neighborhood
– Plain Ordinary Telephone Service
– What analog is, and how it relates to copper wires, electricity, circuits and sound
– How microphones and speakers work
– The human hearing range
– Whether trees falling in the forest if no-one is there to hear them cause a sound
– The voiceband
– Why and how the telephone system can limit frequencies to the voiceband
– Why two wires are used
– Why they are twisted together (twisted pair)
– Tip and ring, -48 volts
– Supervision, dial tone, ringing, lightning protection
– Touch-tone and DTMF
– Basics of SS7
– Call routing between carriers using SS7
Detailed Course Outline
1. Introduction Course introduction and overview
2. History of Telecommunications Local phone companies, long distance; US: Bell System, breakup, LECs and IXCs; Canada
3. The Public Switched Telephone Network (PSTN) Loops and trunks, CO, customer premise, circuit-switching, outside plant, loop length, remotes
4. Analog Circuits and Sound What analog means, microphones and speakers, copper wires and electricity, trees falling in the forest
5. The Voiceband Reproducing thoughts vs. reproducing sound, frequency range, filters, limitations
6. Plain Ordinary Telephone Service (POTS) Twisted pair, analogs on two wires, dial tone, ringing, supervision, lightning protection
7. Signaling: Pulse Dialing and DTMF Dial-up, make-or-break signaling, touch-tone, DTMF, in-band signaling
8. Signaling System 7 (SS7) Control system for the PSTN, SCPs and SSPs, call routing between carriers
Download the Course Brochure PDF: