Wireless Telecommunications is a comprehensive course on wireless, mobile telecommunications plus wireless LANs and satellites.
We begin with basic concepts and terminology including base stations and transceivers, mobile switches and backhaul, handoffs, cellular radio concepts and digital radio concepts.
Then, we cover spectrum-sharing technologies and their variations in chronological order: GSM/TDMA vs. CDMA for second generation, 1X vs. UMTS CDMA for third generation along with their data-optimized 1XEV-DO and HSPA, how Steve Jobs ended the standards wars with the iPhone and explaining the OFDM spectrum-sharing method of LTE for 4G.
This course is completed with a lesson on WiFi, or more precisely, 802.11 wireless LANs, and a lesson on satellite communications.
You’ll gain a solid understanding of the key principles of wireless and mobile networks:
• Coverage, capacity and mobility
• Why cellular radio systems are used
• Mobile network components and operation
• Registration and handoffs
• Digital radio
• “Data” over cellular: Internet access
• Cellular technologies: FDMA, TDMA, CDMA, OFDM
• Generations: 1G, 2G, 3G, 4G
• Systems: GSM, UMTS, 1X, HSPA, LTE
• WiFi, 802.11 wireless LANs
• Satellite communications
It is important to understand how packets and frames are related, and in particular, IP packets vs. Ethernet or MAC frames.
Packets are for networks. A packet is a block of user data, such as a piece of an e-mail message, with a network address on the front. The network address is the final destination. The standard for network addresses is IP.
Network equipment like routers receive an IP packet on an incoming circuit, examine the indicated destination IP address, use it to make a route decision, then implement the decision by forwarding the packet to the next router, on a different circuit.
A frame is a lower-level idea. Frames are used to communicate between stations on the same circuit. The circuit may have multiple stations physically connected onto it, like a wireless LAN, a few stations connected by a LAN switch, or only two stations like a point-to-point LAN cable. Each station has a Media Access Control (MAC) address, sometimes called a hardware address, link address or Layer 2 address.
A frame has framing to mark the beginning and end, sender and receiver MAC addresses to indicate the stations on the circuit, control information, a payload and an error detection mechanism.
The frame is transmitted on the circuit, and all stations on the circuit receive it. If an error is detected at a receiving station, the frame is discarded and might have to be retransmitted somehow.
If no errors are detected, the receiver compares the destination MAC address on the received frame to its own MAC address, and if they are the same, processes the frame, extracting the data payload and passing it to higher level software on the receiver.
If the MAC addresses are not the same, the receiver ignores it and waits for the next one.
The end result is that the payload in the frame is communicated to the correct station on the same circuit, with no errors.
The main purpose of packets is to append an IP address to your data. The IP address is used by network equipment to make route decisions: to relay the packet from one circuit to a different circuit. This is accomplished by receiving the packet then transmitting it to a different machine, usually the next router in the chain.
To actually transmit a packet to another router, the packet is inserted as the payload in a frame, then the frame is broadcast on the circuit that connects to the next router.
Notice that there are two addresses: the IP network address and the MAC address.
The IP address on the packet is the final destination, and so does not change. The MAC address on the frame indicates the destination on the current circuit, and so is changed as the data is forwarded from one circuit to another.
Packed with information, authoritative, up to date, covering all major topics – and written in plain English – Telecom 101 is an invaluable textbook and day-to-day reference on telecommunications.
Telecom 101 covers the core knowledge set required in the telecom business today: the technologies, the players, the products and services, jargon and buzzwords, and most importantly, the underlying ideas… and how it all fits together.
The course materials for Teracom’s famous Course 101 Telecom, Datacom and Networking for Non-Engineers, augmented with additional topics and bound in this one volume bring you consistency, completeness and unbeatable value.
Our approach can be summed up with a simple philosophy: Start at the beginning. Progress in a logical order. Build one concept on top of another. Finish at the end. Avoid jargon. Speak in plain English.
Bust the buzzwords, demystify jargon, and cut through doubletalk!
Fill gaps and build a solid base of structured knowledge.
Understand how everything fits together.
… knowledge and understanding that lasts a lifetime.
Ideal for anyone needing a book covering all major topics in telecom, data communications, IP and networking… in plain English.
A wealth of clear, concise, organized knowledge, impossible to find in one place anywhere else!
Covering all major topics, we begin with the Public Switched Telephone Network (PSTN), then
• progress in a logical order, building one concept on top of another,
• from voice and data fundamentals to digital, packets, IP and Ethernet, VoIP,
• fiber and wireless, DSL and cable, routers and networks, MPLS, ISPs and CDNs,
• and finish with the Brave New World of IP Telecom, where voice, data and video are the same thing.
• An invaluable day-to-day reference handbook
• Learn and retain more reading a hard copy, professionally printed and bound
• Up-to-date: published 2016
• Allows you to study and review topics before attending a course
• An economical and convenient way to self-study
… these are the materials to an instructor-led course that costs $1395 to attend.
• The Certification Study Guide for the prestigious Telecommunications Certification Organization (TCO) Certified Telecommunications Analyst (CTA) telecommunications certification.
Written by our top instructor, Eric Coll, M.Eng., Telecom 101 contain 35 years of knowledge and learning distilled and organized into an invaluable study guide and practical day-to-day reference for non-engineers.
Looking through the chapter list and detailed outline below, you’ll see that many chapters of Telecom 101 are like self-contained reference books on specific topics, like the PSTN, IP, LANs, MPLS and cellular.
You can get all of these topics bound in one volume for one low price.
Compare this to hunting down and paying for multiple books by different authors that may or may not cover what you need to know- and you’ll agree this is a very attractive deal.
Career- and productivity-enhancing training… an investment that will be repaid many times over.
This is Section 2.9.1 of the new Telecom 101, 4th edition
print and ebook available January 2016
Brought to you by BOOT CAMP January 25-29 2016 – Silicon Valley
– – –
This diagram provides a very high-level block diagram view of the processes involved in communicating speech in IP packets from one person to another:
Starting on the left, commands from the speaker’s brain cause combinations of lungs, diaphragm, vocal cords, tongue, jaw and lips to form sounds.
A microphone is positioned in front of the mouth and acts as a transducer, creating a fluctuating voltage which is an analog or representation of the sound pressure waves coming out of the speaker’s throat.
This is fed into a codec, which digitizes the voltage analog by taking samples of it 8,000 times per second and coding the value of sample into binary 1s and 0s. Typically, the value of each sample is represented with a byte, meaning 64 kb/s to be transmitted.
Approximately 20 ms worth of coded speech is taken as a segment and placed or encapsulated in an IP packet.
The IP packet begins with a header, which is control information, the most interesting part being the IP address of the source telephone and IP address of the destination telephone.
IP packets are moved from the source to the destination over a sequence of links.
The links are connected with routers, which relay the packets from one link to the next.
Lower level functions such as framing and link addressing are usually performed following the IEEE Ethernet and MAC standards.
At the lowest level, the links are physcially implemented with Category 6 LAN cables, DSL modems, Cable modems, fiber optics and radio systems.
At the destination, the bits are extracted from the IP packet and fed into a codec, which re-creates the analog voltage.
This voltage drives a speaker, which re-creates the sound pressure waves, which travel down the ear canal to the inner ear, causing hairs on the cochlea to vibrate, triggering neural impulses to the brain, making the listener think they are hearing something.
– – –
It’s important to note that the voice packets are communicated directly from one telephone to the other over the IP network.
The packets do not pass through a CO telephone switch, for example.
In this post, we take a closer look at the fourth development: a worldwide standard for mobile wireless has finally been achieved with 4G LTE.
Mobility means it is possible to start communicating with a particular radio base station, then when moving physically away, be handed off to another base station down the road to continue communications uninterrupted. In a non-mobile system (like WiFi), communication ceases if you move too far away.
The first generation (1G) of mobile radio was characterized by analog FM on frequency channels. Numerous incompatible systems were deployed: AMPS in North America, TACS in the UK, NMT in Finland and others.
The second generation (2G) was digital, which means modems communicating 1s and 0s between the handset and base station. Again, several incompatible systems were deployed, and two warring factions emerged, which could be called the “GSM/TDMA faction”, and the “CDMA faction”.
By far, the most popular 2G system was GSM, a European technology where a number of users time-share a single radio channel. Another system was IS-136, called “TDMA” in North America, deployed by the company currently known as AT&T Wireless in the US and Rogers in Canada.
A less popular 2G system employed CDMA, using technology patented by American company Qualcomm, and deployed by Verizon, Sprint and Canadian telephone companies.
These 2G systems were totally incompatible. A basic phone from a carrier could not work on another carrier unless they both used exactly the same system.
To try to avoid a repeat of the incompatibility for the third generation, the International Telecommunications Union (ITU) struck a standards committee in year 2000 called IMT-2000, its mission to define a world standard for 3G.
They failed. IMT-2000 instead published a 3G “standard” with five incompatible variations. The two serious variations were both CDMA – but differed on the width of the radio bands, the control infrastructure and synchronization method among other things.
The GSM/TDMA faction favored the deployment of CDMA in a 5 MHz wide band. This was called IMT-DS, Direct Spread, Wideband CDMA and Universal Mobile Telephone Service (UMTS). Its data-optimized version was called HSPA.
The CDMA faction favored a strategy that was a basically a software upgrade from 2G, employing existing 1.25 MHz radio carriers. This is called IMT-MC, CDMA multi-carrier, CDMA2000 and 1X. Its data-optimized version was called 1XEV-DO.
Again, these 3G systems were completely incompatible. A basic UMTS phone could not work on a 1X network.
Market forces finally pushed the two camps together.
The fact that there were far more users in the GSM/TDMA faction meant that their phones were less expensive, had better features and appeared on the market first. This put the carriers in the CDMA/1X faction at a disadvantage. This trend was continuing into 3G, where UMTS phones would have the same advantage over 1X phones.
Then, Steve Jobs invented the world’s most popular consumer electronic product, the iPhone – but only permitted carriers in the GSM/TDMA/UMTS faction to have it. This severely tilted the playing field.
In the face of this, the CDMA/1X faction threw in the towel, and decided to go with the GSM/TDMA/UMTS faction’s proposal for the fourth generation (4G), called LTE, to level the playing field.
And once this was agreed, Steve Jobs allowed the iPhone on all networks. One of the legacies of Steve Jobs will not just be the iPhone, but ending the standards wars by pushing the industry to agree on LTE as a single worldwide standard for mobile communications as of the fourth generation, using the leverage of his iPhone.
In this post, we take a closer look at the third development: MPLS has replaced ATM for traffic management, achieving another long-held goal in the telecommunications business, called convergence or service integration.
A long-held goal in the telecommunications business has been to transport and deliver all types of communications on the same network and access circuit, and in an ideal world, with a single bill to the customer. This idea is sometimes called convergence, though service integration is a more accurate term.
It results in a large cost savings compared to different networks, access circuits and bills for each type of communications.
In days past, this was not the case.
A residence would have at least two entry cables: twisted pair for telephone and coax for television, and separate bills for each.
The situation was even worse and more expensive in the case of a medium or large organization.
At each location, a typical organization would have the requirement to communicate
• Telephone calls to/from the PSTN,
• Telephone calls to/from other locations of the organization,
• Data to/from other locations of the organization, and
• Data, video and possibly voice to/from the Internet.
In days past, the organization might have had four physical access circuits and services – along with four bills:
• ISDN PRI over T1 to a LEC for telephone calls to/from the PSTN,
• Tie lines or a voice VPN with a custom dialing plan from an IXC for telephone calls to/from other locations of the organization,
• Dedicated T1s from an IXC for data to/from other locations of the organization, and
• DSL, Cable or T1 access from an ISP for data, video and possibly voice to/from the Internet.
Not only did this mean four services and four access technologies and four bills for the customer, it also meant the carrier had to implement and support four network technologies… a very expensive situation.
The solution to integrate all of this onto one access circuit and one network is twofold:
At the source,
• Format all types of traffic the same way, and
• Paste an identifier on the front of each piece of traffic, indicating what it is and where it goes.
Then all traffic can be carried interspersed on the same access circuit and in the same network, which results in a huge cost savings for both the customer and the carrier.
The identifier on the traffic is used to both route the traffic to the correct destination, and manage the traffic in the network, performing functions like load balancing, prioritization and restoration.
Starting in the 1980s, telephone companies and equipment manufacturers attempted to implement this with a technology called Asynchronous Transfer Mode (ATM). Literally billions of dollars were spent developing and deploying ATM from 1980 to 2000… but it failed and died, becoming too complex and too expensive, and not used for voice at the big telephone companies.
Multiprotocol Label Switching (MPLS) combined with IP has succeeded where ATM failed and is now universally implemented.
Of course, there is a lot of jargon to learn and many components to the “MPLS” story.
Here is a VERY brief explanation:
• All traffic is formatted into IP packets by the equipment that generates it, for example, a telephone or computer.
• Traffic is categorized into classes. A class of traffic goes from the same place to the same place and experiences the same transmission characteristics like delay and lost packets.
• A packet is identified as belonging to a particular class by pasting a number called a label on the front of the IP packet.
• The device that does the classification and labeling of packets is the ingress device, called a Label Edge Router in MPLS. It is normally Provider Equipment (PE), meaning owned and furnished by the service provider, located at the customer premise.
• Network equipment, called Label Switching Routers in MPLS, use the label number to route and in some cases prioritize the packet.
• Labels can be stacked, meaning one label pasted in front of another. This allows the network to manage similar kinds of traffic as a single entity in network control systems.
Returning to our example illustrated above, the four circuits illustrated at the top of the diagram can be replaced with one access circuit with three traffic classes (three labels). The physical access circuit could be 10 Mb/s to 10 Gb/s Optical Ethernet.
The three traffic classes / labels would be:
• A traffic class for telephone calls. This might be called a “SIP trunking service” by the marketing department. This class will carry VoIP phone calls to the carrier for communication to other locations of the organization, or for conversion to traditional telephony for phone calls to the public telephone network.
• A traffic class for data. This might be called a “VPN service” by the marketing department. This class carries file transfers, client-server database communications and the like securely to other locations of the organization.
• A traffic class for Internet traffic. This class carries anything in IP packets to the Internet.
All of this traffic is IP packets interspersed over the single access circuit.
At the other end of the access circuit, the carrier uses the label to route the traffic onward and possibly prioritize it to assure the appropriate service level.
The result is all of the organization’s traffic carried over a single access circuit, using a single technology.
This is one of the Holy Grails of the telecommunications business, called convergence or service integration, having significant advantages in cost and flexibility.
This is a concise description of a story that has many different facets.
In Teracom training, this discussion comes AFTER many other lessons explaining all of the underlying concepts, related technologies like PRI and SIP trunking and their jargon.
If you would like the whole story, it is currently included in the following training:
A two-day course for finance, strategy, management, software, customer support and other personnel providing a comprehensive overview and update on telecom network technologies.
Our goal is to bust the buzzwords, explain the jargon, technologies and standard practices in the telecom network business, and importantly, the underlying ideas and how it all fits together.
Complete with a detailed book for future reference, this course will fill in the gaps and provide you with the knowledge you need to eliminate frustration and be more accurate and productive.
This training is an investment that will be repaid many times over. Join us for this career-enhancing opportunity!
Demystify Buzzwords And Jargon
One of the biggest challenges in telecommunications is all of the acronyms, abbreviations, jargon and buzzwords.
The list goes on and on: POTS, PSTN, loops, trunks, VoIP, SIP trunking, Hosted PBX, DSL, DS1, T1, PRI, ILEC, CLEC, POP, MAN, TDMA, CDMA, LAN, WAN, Ethernet, MAC address, MAC frame, IP packet, TCP/IP, OSI, Layer 2, Layer 3, VLAN, TDM, DWDM, FTTN, FTTH, FTTP, DHCP, NAT, MPLS, VPN, SLA, ISP, DNS …
Plus, there is a second-order problem: even if you were to figure out all of the current jargon and buzzwords, it’s certain that new ones will be invented next month!
It can be very frustrating sitting in meetings with these terms flying around and not understanding most of them… particularly when someone asks your opinion.
So the question is: how to get on top of all the jargon and buzzwords, knowing that there is going to be constant change?
Our answer: understand the fundamentals. Take the cover off the box and understand how it works. Once we do this, we discover that there are only a few main ideas in telecom technology, with incremental improvement in each area.
Taking this course and understanding the fundamental ideas puts you back in control, with the confidence to contribute effectively. Even if you don’t know the exact details of a product someone is discussing, you will still know what they are talking about.
Understand The Network Cloud
People like to draw a diagram of a network as a cloud with sticks poking into it, and refer to the network as “The Cloud”. This might be useful for drawing diagrams, but if you are using, planning, ordering, managing, troubleshooting, developing software for or otherwise involved with telecom circuits and services, understanding what’s inside is productivity- and career-enhancing knowledge.
In this course, you will learn how circuits and services are actually provided, giving you the knowledge to make meaningful comparisons and accurate decisions.
We’ll explore every different aspect of The Cloud:
The fundamental structure of the network: access, switching and transmission;
The companies that physically implement the network: ILECs, CLECs, IXCs, how and where they interconnect, and
The components of a service: access circuit technology, network service type and billing plan;
The equipment used: switches, routers, multiplexers, fiber and modems;
How users share the network: channels, packets and Service Levels.
Gain Vendor-Independent Knowledge You Can Build On
The knowledge you gain taking this training course is vendor-independent foundational knowledge in telecommunications.
You will be able to build on this proven knowledge base to quickly get up to speed for a particular project – then have the versatility to work on subsequent projects.
The cost of this training will be repaid in productivity gain many times over.
Based on Teracom’s proven instructor-led training courses developed and refined over twenty years providing training for organizations including AT&T, Verizon, Bell Canada, Intel, Microsoft, Cisco, Qualcomm, the CIA, NSA, IRS, FAA, US Army, Navy, Marines and Air Force and hundreds of others, Teracom online courses are top-notch, top-quality and right up to date with the topics and knowledge you need.
Teracom was awarded a US Government Federal Supply Schedule (GSA) contract for these training services… which involved an independent evaluation where we scored a 97% quality rating from our customers!
Join us today to make this invaluable addition to your knowledge and skills!
Fundamentals of TelephonyIt all begins with the Public Switched Telephone Network and Plain Ordinary Telephone Service. We’ll establish with a model for the PSTN, explaining analog circuits, loops, trunks, remotes, circuit switching and other telephony buzzwords and jargon. We’ll understand how the network is organized into access, switching and transmission. We’ll cover Centrex and traditional PBX, then understand Voice over IP (VoIP) concepts and components, soft switches and SIP trunking.
With the fundamentals in place, we’ll cover digital. You will learn what is really meant by “digital”, how voice is digitized to 64 kb/s, and MP4 digital video. We’ll complete the story understanding how the resulting bits are communicated using binary pulses on copper and fiber.
Analog and Digital: What Do We Really Mean?
Continuous Signals, Discrete Signals
Voice Digitization (Analog → Digital Conversion)
Voice Reconstruction (Digital → Analog Conversion)
Voice Digitization: 64kb/s G.711 Standard
Digital Video: H.264 / MPEG-4 Standard
Implementing Digital: Binary Pulses
3. The Telecommunications Industry, Competition and Interconnect
In this chapter, you will gain a solid understanding of the telecommunications business and how it is structured, including telephone companies, local and long-distance, and how these companies compete and interconnect. You will understand how each organization fits into the picture, including ILECs, IXCs, resellers, CLECs, collocations, regional rings, POPs and MANs.
US Domestic Telcos
AT&T and Verizon
PSTN Switching Center Hierarchy
1984: LECs, IXCs and POPs – Last Mile: Switched Access from ILEC
Competitive Carrier – Last Mile: Dedicated Line from ILEC
Competitive Carrier – Last Mile CLEC: Collocation plus ILEC Dark Fiber
Competitive Carrier Network Model: Regional Rings, POPs and MANs
4. The Cloud
Next, we will demystify the Network Cloud. You will learn why people draw a picture of a cloud to represent a network, then most importantly, what is inside the cloud and understand what’s really going on. You will learn about the three basic kinds of network services available, the equipment used to implement each, and how services are actually provided… highly useful knowledge when planning, ordering, troubleshooting, auditing, or otherwise dealing with carrier services.
Anatomy of a Service
Inside the Network Cloud
Network Equipment: How and Where Each is Used
Summary: How Services Are Provided
5. “Data” Communications and Network Basics
We’ll begin the second day understanding what “convergence” is and how it was achieved by treating telephone calls and television like data communications. Then, we’ll get you up to speed on the concepts, jargon, buzzwords and technologies that were originally developed for datacom and now used for everything. You’ll learn the basic ITU model for data circuits, then plain English explanations of Ethernet, MAC frames and MAC addresses, IP packets and IP addresses, and how they relate.
Convergence: Treat Everything Like Data
Data Circuit Model
Wide Area Networks
Ethernet and 802 standards
Frames and MAC Addresses
Packets and IP Addresses
Packets vs. Frames
6. The OSI Layers and Protocol Stacks
There are so many functions that must be performed to interoperate systems, a structure is required to organize the functions so that separate issues can be treated separately. For this purpose, we’ll use the ISO Open Systems Interconnection 7-Layer Reference Model. You’ll learn what a layer is, the purpose of each layer, examples of protocols like TCP and IP used to implement layers, an overview of many different protocols and functions you’ve heard of, and understand how a protocol stack works for applications like web surfing and VoIP.
Protocols and Standards
ISO OSI Reference Model
OSI 7-Layer Model
Physical Layer: 802.3, DSL, DOCSIS
Data Link Layer: 802 MAC
Network Layer: IP and MPLS
Transport Layer: TCP and UDP
Session Layer: POP, SIP, HTTP
Presentation Layer: ASCII, Encryption, Codecs
Application Layer: SMTP, HTML, English …
Protocol Stack in Operation: Babushka Dolls
7. IP Networks, Routers and Addresses
This chapter is dedicated to IP. We begin with the simplest framework, a private network, to understand routing and bandwidth on demand. We’ll introduce the term Customer Edge router and examine the functions performed by a router. Then we will cover IPv4 addressing: IPv4 address classes, static vs. dynamic addresses and DHCP, public and private addresses and NAT, and IPv6, how IPv6 addresses are allocated and assigned, and types of IPv6 addresses.
Simplest IP Network Example: Routers Connected with Dedicated Lines
Routers and Customer Edge (CE)
IPv4 Address Classes
DHCP, Static and Dynamic Addresses
Public and Private IPv4 Addresses
Network Address Translation
IPv6 Address Allocation and Address Types
8. Transmission Systems
We’ll begin with the basics of fiber and wavelengths, then compare older channelized transmission systems like T1 and SONET to newer packet-based transmission systems based on IP and Optical Ethernet.
Fiber Optics and Fiber Cables
Wave-Division Multiplexing: CWDM and DWDM
Channelized Time Division Multiplexing (TDM)
DS0s and SONET Framing
Channelized Digital Hierarchy: Standard Legacy Transmission Speeds
Digital Carrier Systems: Legacy Transmission Technologies
Statistical Time Division Multiplexing
Overbooking and Bandwidth on Demand
IP Packets and Optical Ethernet
9. The Last Mile
To complete the transmission story, we’ll briefly explore how the “last mile” is connected: fiber to the premise, active and passive, and fiber to the neighborhood followed by DSL or cable modems on copper.
Fiber to the Premise: PONs and Active Ethernet
Fiber to the Neighborhood (FTTN), DSL to the Premise
Broadband Carriers: FTTN & Broadband Coax to the Premise
DOCSIS and Cable Modem Standards
10. MPLS and Carrier Networks
IP packets will be used to carry everything, including phone calls and television. But IP in itself does not include any Quality of Service (QoS) mechanism, no way to prioritize or manage traffic. This is implemented with MPLS. In this chapter, you’ll learn the basics of carrier packet networks, identifying Provider Edge (PE), Customer Edge (CE), access and core, and the important concept of a Service Level Agreement. Then without bogging down on details, you’ll get a big-picture understanding of MPLS and how it is used to implement business customer services, differentiated services and Class of Service (CoS), service integration and traffic aggregation.
Carrier Packet Network Basics
Service Level Agreement
Provider Equipment at the Customer Premise
Virtual Circuit Technologies
MPLS VPNs for Business Customers
MPLS and Diff-Serv to Support Classes of Service
MPLS for Service Integration
MPLS for Traffic Aggregation
11. The Internet
The Internet is a giant collection of interconnected IP networks called Autonomous Systems across which the public can communicate IP packets. In this chapter, we’ll understand what an ISP is and how they connect to others via transit and peering, and conclude by understanding telephone calls over the Internet and secure VPNs over the Internet.
A Network To Survive Nuclear War
The Inter-Net Protocol
Internet Service Providers
Internet Telephony & VSPs
12. Wrapping Up
The final chapter brings all of the concepts together with a top-down review. You’ll learn valuable insight into telecom project management and methodology, and review telecom, datacom and networking technologies, services and solutions. We’ll conclude with a peek at the future of telecommunications, where the telephone network and Internet become the same thing.
Technology Deployment Steps
Review: Circuits and Services
Access and Transmission Technology Roundup
Carrier IP Services
Our goal is to explain the underlying concepts, providing you with a practical understanding of telecom technologies and services, without bogging down on details. You will gain a solid base of structured knowledge that can be applied to immediate projects and can be built on in the future… an investment in productivity that will be repaid many times over.
Six Reasons to Take This Course
Teracom’s courses have been taught to wide acclaim across North America since 1992 and are designed for professionals needing to fill in the gaps, build a solid base of knowledge and understand how it all fits together.
Cut through the buzzwords, jargon and vendor hype to gain a structured understanding of telecommunications and networking, allowing you to make meaningful comparisons and informed decisions… knowledge skills you can put to use today and in the future.
Get up to speed on the latest developments and trends. This course is totally up to date with SIP trunking, VoIP, Optical Ethernet, MPLS and more.
Get a solid base of vendor-independent knowledge of technologies, service providers, standard practices and mainstream solutions that you can build on.
Understand how it all fits together.
Learn more with instructor-led training – the best kind of training you can get – where you can interact and ask questions with instructors consistently rated “excellent” on student evaluations.
Obtain a course book with detailed notes that will be a valuable reference for years.
Develop a structure for understanding technologies and solutions, allowing you to make informed choices and meaningful comparisons — knowledge you can’t get on the job, reading trade magazines or talking to vendors.
Your Course Materials: An Invaluable Reference
Every course comes complete with a high-quality course book that’s been called the best on-the-job reference tool around. Written in plain English, this easy-to-use reference includes copies of all graphics PLUS extensive detailed text notes. Topics are organized in logical groups to give you easy reference after the seminar to the practical experience, theoretical background, and unbiased information on industry technologies, products and trends you’ll need. With numerous chapters covering all major topics, you’ll obtain an invaluable resource impossible to find anywhere else in one book.
Free Bonuses! Online Courses & CTNS Certification
As a free bonus, you get the full set of Teracom’s Online Courses. Not only are these an excellent way to take a second pass through various topics, the Online Courses include pictures of equipment and additional lessons beyond those in this course.
If you choose to write the optional exams, you can earn Telecommunications Certification Organization (TCO) Certified Telecommunications Network Specialist (CTNS) Certification, complete with Certificate suitable for framing and a personalized Letter of Reference for your résumé.
Certification is concrete proof of your knowledge. The included Unlimited Plan option allows you to repeat exams as needed until you pass… which means guaranteed to pass if you’re willing to learn!
Here’s What Seminar Attendees Like You Are Saying
Hundreds of people like you have benefited from Teracom’s core training. Many tell us this was their best course ever; filled gaps in their knowledge and tied everything together… knowledge they’ve been needing for years. Others on course their first week on the job remarked “what a wonderful way to get started in the business.”
Here’s a sampling of comments from Teracom alumni:
“Feedback from my team was TERRIFIC. It gave our entire technical Call Center a common foundation, and you seem to have crafted that perfect balance between technical depth, real-world applications, and lively delivery. I couldn’t be happier with the results. The things my team learned from this training were applied in real-world situations almost immediately.”
– Rusty Walther, Vice President, Client Services, AboveNet Communications
“Excellent! I learned a lot – everyday terms, definitions, and acronyms. Seminar notebook very helpful. The instructor was the best I ever had – lots of knowledge and experience and stories were GREAT.”
– Serena Laursen, Microsoft
“The selection of material – the order of its presentation – the way it was presented… incredibly effective at presenting concepts and ideas – uses great analogies and stays on topic.”
– Susan Lennon, Nortel
“The seminar delivered exactly what was advertised, at a very high quality.
Truth in advertising!” – Gary Lundberg, Copper Mountain Networks
Whether you work for an organization that produces telecom, datacom or networking products or services; or you buy these products and services – or just have to get up to speed on what all the rest of them are talking about when they say “SIP trunking”, “Ethernet”, “MAC frame”, 4G, MPLS or VPN…
“Best course we have ever had onsite at 3Com”
“Perfect content; well organized, well paced, building block approach,
resulted in a very nice cathedral” – Jim George, Qualcomm
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About the Author
Eric Coll is an international expert in telecommunications, data communications and networking and has been actively involved in the industry since 1983. He holds Bachelor of Engineering and Master of Engineering (Electrical) degrees.
Mr. Coll has taught telecommunications technology training seminars to wide acclaim across North America since 1992, and has broad experience working as an engineer in the telecommunications industry. He has worked for Nortel’s R&D labs as a design engineer on projects including digital voice and data communications research and digital telecom network equipment design, and on satellite radar systems, consulting on Wide Area Network design, and many other projects in capacities ranging from detailed design and implementation to systems engineering, project leader and consultant.
In addition to being founder and Director of Teracom Training Institute, Mr. Coll provides consulting to the telecommunications industry, specializing in telecommunications technology R&D and as a Subject Matter Expert in tax matters.
In this post, we take a closer look at the first one: “All New Phone Systems Are VoIP”:
Basic Principle of Operation
The voice entering the microphone is digitized in the near-end phone. Typically 20 ms of digitized voice is packaged in an IP packet, which is carried in an Ethernet MAC frame on copper and fiber LAN cables to the far-end phone. There, the digitized voice is extracted from the packet and used to re-create the voice coming out of the speaker at the far end.
There are, of course, many details not mentioned, including the digitization method, called a codec, the Real-Time Transport Protocol (RTP) that adds timing information, the User Datagram Protocol (UDP) that adds error control and indicates the port number on the far-end phone, and how the bits are represented on copper and fiber LAN cables, to mention a few.
SIP and Softswitches
In a traditional phone system, voice travels on a dedicated circuit to a telephone switch, which physically transfers it to a different circuit to get it to the far end. Not so with VoIP! The near-end VoIP telephone creates a packet addressed to the far-end telephone, then the packet travels over LAN cables and through routers, interspersed with many other packets, to the far-end telephone. The VoIP packet does not pass through a telephone switch. The two VoIP phones exchange packets directly.
So a question is: how does the near-end telephone know what the far-end telephone’s IP address is? This is accomplished with the Session Initiation Protocol (SIP), which implements servers allowing the calling party to find out the IP address of the called party – if the called party wants to accept the call… a privacy shield to prevent Spam over Internet Telephony (SPIT). The servers implementing SIP are called softswitches. They are call setup assistants, and drop out of the picture once the call is established. The phones communicate packets directly.
What happens if the two telephones are in different cities? How does the packet move from the near-end VoIP phone to the far-end VoIP phone? One method is to use a gateway to convert the VoIP to an old-fashioned phone call and carry it over PBX trunks and/or telephone company trunks to the far end, where a gateway converts it back to VoIP… but this loses out on the voice-data-video integration synergy of IP communications. Another method is to carry the VoIP packet over the Internet… but there are no quality guarantees on the Internet. A third choice is to pay a carrier to move the VoIP packet from one building to another, as an IP packet, with guaranteed quality. This is called SIP trunking. It should be called VoIP trunking.
That is a thumbnail sketch of VoIP. If you would like to learn more, this is covered in the following Teracom training:
“No longer Greek to me! After taking your course, I sat in on a round table at a conference yesterday where VoIP was discussed by Time Warner Cable and Vonage – and I understood most of their diagrams and explanations – something that would have been Greek to me two weeks ago. Thank you!” — Bob Sabin, Tel Control, Inc.