|
|
|
| Your Teracom newsletter for December! |
|
|
| In this issue: |
|
| • New Tutorial - Communicating Data in a Frequency Pass-Band |
|
| • End-of-year special: 25% off DVD-Video Courses |
|
| • End-of-year special: 50% off Online Course Modules & CTA Certification |
|
| • Course 101 coming next to Philadelphia, Denver and Orlando: carpe diem! |
|
| • Course 110 in NYC |
|
| • New: IP/MPLS Course - DC and Santa Clara in 2012 |
|
| |
|
| End-of-year special: 25% off DVD-Video Courses |
|
|
Has anyone noticed that the sun is climbing to a lower and lower peak altitude in the sky each passing day?
I am starting to get afraid it will go away altogether and not come back.
To encourage the sun to come back, I am going to put lights in the trees around my house. Hopefully, that will work. |
|
As an added measure, we're also sacrificing 25% off all DVD-Video courses between now and December 21.
Based on previous years' experience, we think a new sun will be born to man sometime after the 21st, so we'll be having a week of feasting to celebrate the birth and the new solar year then. Fingers crossed! |
|
25% off all DVD-Video courses! Use coupon #1124. Offer ends 2011-12-21. Order now |
|
P.S. You still get all the free bonuses when purchasing our very popular video sets: up to five free Telecom 101 eBooks, five free sets of Online Course modules and five free CTA Certifications! details |
|
| End-of-year special: 50% off Online Course Modules & CTA Certification |
|
|
|
To be triply sure, we're also sacrificing 50% off all Online Course Modules & CTA Certification between now and December 21.
If you're interested in just a single topic, you can benefit from world-renowned Teracom training for as little as $19 and change.
List of Online Course Modules CTA Certification 100% Money-Back Guarantee |
|
|
50% off Online Course Modules & CTA Certification! Use coupon #1125. Offer ends 2011-12-21. Order now |
|
| Course 101 coming next to Philadelphia, Denver and Orlando: carpe diem! |
|
|
Telecom, Datacom and Networking for Non-Engineering Professionals is our famous core training - an intensive three-day course designed for non-engineering professionals, to get you up to speed on virtually all aspects of telecom, datacom and networking, from fundamentals and jargon to the latest technologies. This is the essential core telecom knowledge set, tuned and refined over the course of almost 20 years now. You get 384-page course materials with detailed text notes, a top-ranked instructor, free companion reference Telecom 101 eBook and free TCO CTA Certification for $1395. |
|
In addition to scheduling Course 101 in our usual most popular locations (NY, DC, Silicon Valley), we're also coming back to cities we hit less frequently in early 2012: Philadelphia, Denver and Orlando. If you're in the area and have wanted to take Course 101 without a travel budget - or maybe feel the need to verify the wireless data coverage or something in Orlando in February (just to make sure everything is working properly) - seize the day and register now. We won't be back to these cities for a while! Register |
|
|
|
|
|
| Course 110 IP, VoIP and MPLS for the Non-Engineering Professional |
|
| IP, VoIP and MPLS for the Non-Engineering Professional is the "next" course in our Core Training series, covering IP technologies: IP networks from the ground up, fiber, Ethernet, routing, MPLS, security and VoIP. Three day course. 425-page course materials. Top-ranked instructor. $1395. Designed for non-engineers, this training course will give you the solid, vendor-independent foundation knowledge necessary to deal with IP telecom network projects and IP voice and data applications with confidence. Register |
|
|
|
 Course 115
IP/MPLS Networks and Services
for Non-Engineers |
|
For those who need to get up to speed on MPLS-based telecom, but aren't so much interested in VoIP, we've created a new 2-day Course 115: IP/MPLS Networks and Services for Non-Engineers. |
|
You will benefit from a two-day comprehensive overview and update on today's IP telecom networks and services, from demystifying the network "cloud" to MPLS, service levels, transit and everything inbetween.
|
|
Course 115 focuses on the new telecom network: IP and MPLS, bringing both those with knowledge of traditional telecom and newcomers to the field up to speed on the IP/MPLS network, circuits, protocols, services and players. Register |
|
|
|
|
| Tutorial: Communicating Data in a Frequency Pass-Band |
|
|
| Wireless radios, cable modems, DSL and even analog telephone lines all share a characteristic: they are restricted to a range of frequencies that does not include 0. |
|
| This is often called a pass band or pass-band channel, since there is a range of frequencies that will be passed through this channel and energy at all other frequencies is suppressed. |
|
|
To communicate data, the challenge is to find a method of representing 1s and 0s in a way that can be carried over this pass band. |
|
| One question sometimes asked is, "Why not transmit the binary digits 'digitally'?" What is meant by this is, "Why not use pulses of voltage, for example, +3 volts applied to the line for a short time to represent a "1" and -3 volts to represent a zero?" |
|
| The answer for radio, cable modems, DSL and analog telephone lines (a.k.a. Plain Ordinary Telephone Service, POTS) is the same: |
|
| Using POTS as a familiar example, the answer for POTS is that the telephone company has provided a voiceband circuit by plugging the copper wire loop into a line card on a telephone switch. The line card has a filter on it that blocks the transmission of energy at any frequencies less than 300 or greater than 3300 Hz. Only energy in the pass-band range from 300 - 3300 Hz is transmitted. |
|
 |
|
| Representing the binary digits as pulses of voltage, which would look something like a square wave on the line ("IN" in the diagram), would require a component at 0 Hz, and a series of frequency components at frequencies higher than 3300 Hz. |
|
| But the filter on the line card suppresses energy outside the pass band. Only energy in the frequency band between 300 and 3300 Hz is passed; everything else is suppressed. |
|
| What would make it through the voiceband filter would be a flat line with some ringing on the line at the edges of the pulses. ("OUT" in the diagram). Adding the line noise to that, it becomes very difficult to detect the edges of pulses at the far end... so pulses will not work on a POTS line. |
|
| The story for radio channels, cable modem channels and DSL is the same - only the numbers change. |
|
| A design that will work on a passband channel is one that employs tones or carrier frequencies that are within the pass band. |
|
| Variations in the amplitude (volume) of a single pure frequency within the pass band, or variations of the frequency, its phase, or combinations thereof will be passed to the other end, and so this is a method that can successfully represent 1s and 0s in the frequency channel. |
|
| The technique of representing 1s and 0s by varying characteristics of tones is called modulation. The equipment that performs this function is called a modulator/de-modulator or modem for short. |
|
| Source: Course 101 Telecom, Datacom and Networking for Non-Engineers, page 9.04 - 9.05. |
|
|
|
|
| |
|
| |
| Here are some more links that you may find useful: |
|
| |
Online Courses
Online Courses home • Online Learning FAQs • team training • payment methods • student discounts • certification |
| |
|
|
|
|
| Privacy policy: We hate spam as much as you do. We will NEVER give your email address or any other personally-identifying information about you to anyone without your explicit consent. full statement |
|
|
| About this email: We are sending you this message following your request to receive information from Teracom Training Institute. If you have received this message in error, and/or no longer wish to receive these messages, please accept our apologies for the inconvenience and click here to visit our web site to take your name off our private mailing list. Simply sign in to your myTeracom account, and click the link for "Newsletter subscription" under My Account Settings, and uncheck the newsletter subscription box on your myTeracom profile. |
|
|
If this message was forwarded to you...
To receive future issues of the Teracom Training Institute newsletter, be informed of new tutorials, video releases, seminars and special offers, add yourself to our private mailing list. We'll never give your e-mail address to anyone. You can unsubscribe at any time. |
|
|
| Copyright © Teracom Training Institute. All rights reserved. privacy policy |
|
|
| Your colleagues may be interested... would you please forward this to them? |
|
|
Many thanks,
Eric Coll, Director
Teracom Training Institute |
