Physical Layer [rss]

PodSnacks: V.35

Posted Thursday, August 21, 2008 6:00 AM by mgilbert :: 1 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q3/v.35.mp3
Let's look at one of the many DTE to DCE interface specifications. Our topic today is the older, but still widely used, V.35 interface. I'll take you through it's basic characteristics and applications. As usual, you can listen to (or download) Read More...

PodSnacks: Line Code

Posted Tuesday, August 19, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q3/line_code.mp3
Today we're going to go back to the wires, and follow up on another PodSnack we did on digital signaling . Today we're going to look at a few example line codes that are considered digital signaling schemes. I'll talk to you about how they Read More...

PodSnacks: DTE and DCE

Posted Thursday, August 07, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q3/dte-dce.mp3
I went back to the wiki to see what remained to be recorded before I start branching off into completely new articles, and was amazed to discover we never recorded a session on the basic distinction between data terminal equipment (DTE) and data circuit-terminating Read More...

PodSnacks: Hybrid Fiber/Coax (HFC)

Posted Wednesday, August 06, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/hfc.mp3
The fourth and final installment in our access network series, which thus far has focused on Fiber to the X (FTTX), switches gears a bit to a different industry segment, that of the cable companies. In today's PodSnack, Dave and Trevor take a bit Read More...

PodSnacks: Fiber to the Premises (FTTP)

Posted Monday, August 04, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/fttp.mp3
The third installment in our series on Fiber to the X (FTTX) looks at Fiber to the Premises (FTTP). This is the predominant architecture being championed by Verizon as part of their FiOS service. In today's PodSnack, Dave and Trevor discuss the technology Read More...

PodSnacks: Fiber to the Node (FTTN)

Posted Friday, August 01, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/fttn.mp3
Today we continue our series on Fiber to the X (FTTX) with a look at Fiber to the Node (FTTN). This is the predominant architecture being championed by AT&T. In today's PodSnack, Dave and Trevor will explore the technology and discuss some of Read More...

PodSnacks: Fiber to the X (FTTX)

Posted Wednesday, July 30, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/fttx.mp3
Today we begin a short series on Fiber to the X (FTTX), which will be completed over the coming weeks along with our concurrent series on Fiber Channel. FTTX is the generic name given to an entire family of access technologies and deployment models being Read More...

PodSnacks: Unshielded Twisted Pair (UTP) vs. Shielded Twisted Pair (STP)

Posted Wednesday, July 23, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/utp-stp.mp3
Building on yesterday's PodSnacks, today, Paul will take you through the difference between shielded and unshielded twisted pair . It should come as no big surprise that the primary difference is... wait for it... shielding! (Sometimes I just crack Read More...

PodSnacks: Twisted Pair (TP)

Posted Tuesday, July 22, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/twisted_pair.mp3
Let's go down to the wires. Today, Paul will go through some of the history and basic characteristics of twisted pair . You can listen to (or download) the PodSnack by clicking here , or you can use the Flash player below. If you have an idea or request Read More...

PodSnacks: Power over Ethernet (PoE)

Posted Monday, July 14, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/poe.mp3
Ethernet has become such a critical technology today, any time we can spend on it is time well spent. Today, Ethernet serves as a premises-based network technology that can tie together virtually every piece of communication gear in a corporation or residence. Read More...

PodSnacks: Network Interface Layer

Posted Thursday, July 03, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q3/network_interface_layer.mp3
Today we go back to the world of network models and architectures, and we take a quick look at the lowest layer of the four-layer TCP/IP model: the Network Interface Layer . It's not the most exciting thing we could talk about, but it is, in essence, Read More...

PodSnacks: The Digital Concept

Posted Wednesday, June 25, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q2/digital.mp3
I seem to be in a groove of filling in missing pieces of matched sets. A few weeks ago, Paul walked you through the meaning of analog . But we never really discussed the word digital . So today, I'm going to take you through the concept. You can listen Read More...

PodSnacks: Maximum Bit Rate

Posted Tuesday, June 17, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q2/bit_rate.mp3
In another PodSnack we talked about the maximum signaling rate (also known as baud ) of a communication channel. Today we're going to see if we can take the next step and talk about the maximum bit rate. To do that we have to talk a bit about noise Read More...

PodSnacks: Signaling Rate

Posted Thursday, June 12, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q2/signaling_rate.mp3
Just how fast can a given communication system go? There are basically three factors involved. One of them is the maximum signaling rate (also known as baud ) of the channel. In today's PodSnack, I'm going to explain to you what a signaling rate Read More...

PodSnacks: Quadrature Amplitude Modulation (QAM)

Posted Tuesday, June 10, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q2/qam.mp3
We wrap up our discussion of Physical Layer concepts with a look one final digital modulation technique. We recently looked at amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). Now we're going to look at something Read More...
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