Planning for Vo. IP Installation | Assessing Your Infrastructure. Some Internet phone setups fail to impress because easy- to- discover problems exist in the configuration of the telephone adapter or the Internet connection. Checking these problems out before installation could have made the project more successful and the subscriber's first experience with Vo. IP much more satisfying. In this chapter David Field looks at the steps you need to take before going ahead with your Vo. IP installation. This chapter is from the book For more information on Digital Lifestyles topics, visit our Digital Lifestyles Reference Guide or sign up for our Digital Lifestyles Newsletter. Vo. IP places certain demands on your home's Internet connection. If you have networking devices, your Vo. IP installation needs to coexist peacefully with them. You need to take into account devices such as firewalls, gateways, cable and DSL modems, and PCs, and also form a plan for integrating Vo. IP. In this section, I look at the demands Vo. IP will place on your network and some likely installation points for your new devices. Planning for VoIP Installation. By. Figure 3.2 The network diagram with location and bandwidth. Follow the included instructions to install the device in your. · How to Set Up Voice over Internet Protocol (VoIP) in Your Home. VoIP–Voice over IP– means you are able to place phone calls over the. Got network? Many homes with broadband Internet use home gateway devices to connect their cable or DSL modem to one or more computers. If you have a laptop, you may have chosen a wireless gateway to allow you to wander about as you compute. Wireless or not, if you have an Internet gateway, you have a network. A Vo. IP telephone adapter will need to find a home in your network infrastructure. Take a few moments to sketch your network to help you visualize the best place to plug in. A Network Sketch. Your network sketch doesn't need to be anything fancy; a simple diagram on a sheet of paper is fine. Your main goal is to be able to visualize your system and to select proper equipment and locations for your phone system. Use symbols to map out your devices. You can use the diagram I have included as a guide for symbols and formatting, or make up your own (Figure 3. You are the only one who needs to be able to understand your map. Figure 3. 1 A basic network diagram showing the orientation of network devices Filling in Vital Statistics. As you complete your drawing, fill in details such as Internet connection bandwidth and location of devices (Figure 3. You will use this information in your evaluation of your readiness for Vo. IP. Figure 3. 2 The network diagram with location and bandwidth information added. It is a good idea to test your bandwidth in addition to knowing what you are supposed to have. Almost all Internet connections perform at somewhat less than the speed advertised. You can test your bandwidth at a bandwidth site such as www. VoIP My House How to quickly. So why not switch phone companies and go VoIP, and save some money? Network Interface Device. it is probably best to install CAT6. · In previous responses, a brief high-level “how” to configure a VOIP system has been explained. What I would appreciate (and have not been able to find. Cisco Network Diagrams solution. This is an example of a roaming wireless local area network diagram that can be used. install the “Cisco Network Diagrams. Most likely you will need to install a network. connect the Management Port and your PC running VCT to the VoIP network. refer to the Hosted VoIP diagram. Let's look at the phones. You might only have a single phone that you will be using with your service. If so, great! Meet me in the next section. If you would like to connect more than one phone to your Internet phone system, take a quick look at your current configuration. Mapping out your phone system is also important to your planning effort (Figure 3. You should have a clear picture of how you plan to connect any existing phones you have to your new telephone adapter. As you map your system, note the location of each phone jack. Figure 3. 3 A basic diagram of a home's telephone distribution system NIU (Demarcation Point)Phone companies connect to your home at a demarcation point, also called a demarc or network interface unit (NIU). This device acts as a junction point for wires running from within your home to the telephone company's cables (Figure 3. When you install your telephone adapter, you may need to modify connections inside this device to distribute telephone signals throughout your home. We will discuss this process in more detail in Chapter 4. For now, just note the location of this device on your phone system map. Figure 3. 4 A telephone company's demarcation point or network interface unit (NIU) Distribution. Your home's telephone cables originate in the demarcation point and proceed to jacks throughout your home. Inspect the demarcation point carefully to see how many cables run to the inside. Some installers run each cable individually out to the demarcation point; others use a distribution block inside the home to pass the signal to each individual jack (Figure 3. In Chapter 4, I discuss special steps to take if your cables terminate in the demarcation point. Figure 3. 5 A telephone distribution panel in a home Access. If you live in an apartment building or townhome complex, you may not have direct access to the telephone company's demarcation point. If so, please note this on your drawing; it may affect the way you connect your phones to your telephone adapter. Not having access to this connection point means you may not be able to disconnect the telephone company's cables. This can lead to stray voltages being sent from the telephone company into your system—a situation that has been known to damage telephone adapters. I discuss options for this situation in Chapter 4. Identify your challenges. After completing your drawings, you will assess your readiness for Vo. IP installation (Figure 3. Look for factors that may pose a challenge to your installation. Identify factors like bandwidth, telephone company interconnection, and device placement, and form a strategy to deal with these issues. In this section, I examine these challenges and identify possible strategies for dealing with them. Bandwidth. Bandwidth (or the lack thereof) is one of the leading contributors to poor voice quality. As I discussed in Chapter 1, each voice codec has different bandwidth requirements. Other factors that affect bandwidth use include the Vo. IP transport protocol, TCP/IP protocol overhead (the bandwidth used just to keep a connection alive), and Internet bandwidth used concurrently with voice calls. Table 3. 1 shows a breakdown of Vo. IP bandwidth minimums. Table 3. 1. Vo. IP Bandwidth Requirements. Codec. G. 7. 11. G. G. 7. 26. G. 7. 29. Used by codec. 64 Kbps. Kbps. 16–4. 0 Kbps. Kbps. Transport (RTP)2. Kbps. 20 Kbps. 20 Kbps. Kbps. TCP/IP overhead. Kbps. 6 Kbps. 6 Kbps. Kbps. Total. 90 Kbps. Kbps. 66 Kbps. 34 Kbps. If you plan to use your Internet connection for other purposes while making voice calls, you should include an additional factor to account for that use. Moderate Web browsing will be unlikely to cause any problems in a 5. Kbps Internet connection, but heavy file downloading may significantly affect voice- call quality. As you consider bandwidth, keep in mind that even advertised bandwidth fluctuates slightly during use. Most Internet access providers use a practice called provisioning to help them budget bandwidth allocation. They assume that most connections will not use the full advertised rate 1. They base their available bandwidth capabilities on a guess as to what percentage their customers will typically use. If they guess low, you will experience bandwidth restrictions, or bottlenecks. When this happens, you will receive somewhat less than your advertised bandwidth. To see how often this happens, test your Internet bandwidth periodically. Sites like www. bandwidthplace. Vo. IP users (Figure 3. A Google search for "voip speed test" will reveal a list of suitable testing sites. Testing sites supported by specific Vo. IP vendors will indicate how many calls you can support concurrently when using their Vo. IP services. Figure 3. Vo. IP testing results displaying Vo. IP qualification scores. There are a few ways to address bandwidth issues. If you are very interested in a specific Vo. IP provider, and bandwidth is an issue with its service, you might have no choice but to upgrade your Internet connection speed. Often, this is as simple as calling your Internet access provider and asking for an upgrade. Occasionally, upgrading might require additional or updated Internet connection devices to be installed in your home. If you are not set on a specific Vo. IP provider, you might choose to use a provider that uses a lower- bandwidth codec. Some providers use G.
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