gs1-128 c# Figure 16-8: The splitterless GLite installation in Software

Creation QR in Software Figure 16-8: The splitterless GLite installation

Figure 16-8: The splitterless GLite installation
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Carrierless Amplitude Phase Modulation (CAP)
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CAP is closely aligned to Quadrature Amplitude Modulation (QAM) QAM as a technique is widely understood in the industry and well deployed in our older modems Both CAP and QAM are a single carrier signal technique The data rate is divided into two and modulated onto two different orthogonal carriers before being combined and transmitted The main difference between CAP and QAM is in the way they are implemented QAM generates two signals with a sine/cosine mixer and combines them onto the analog domain CAP, on the other hand, generates its two orthogonal signals and executes them digitally Using two digital transversal bandpass filters with equal amplitude characteristics and a p/2 difference in phase response, the signals are combined and fed into a digital to analog converter Then the data is transmitted The advantage of CAP over QAM is that CAP is done in silicon, which is more efficient and less expensive
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CAP was one of the original proposals for use with ADSL technology Unfortunately, this was a proprietary solution offered by a single vendor, which turned heads away from acceptance CAP is shown in Figure 16-9 in its use of the frequency spectrum of the line Most industry vendors agree that CAP has some benefits over DMT, but also that DMT has more benefits over CAP The point here is that two differing technologies were initially rolled out for ADSL (and the other family members), which contradict each other in their implementation
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Figure 16-9: The spectral use of CAP CAP uses the entire loop bandwidth (excluding the 4 kHz baseband analog voice channel) to send the bits all at once There are no subchannels, as found in the DMT technique The lack of subchannels removes the concern about the individual channel transmission and problems To achieve the simultaneous send and receive capability, frequency division multiplexing is used, as is echo cancellation Many of the Regional Bell Operating Companies (RBOCs) have used or tried CAP in their installations, but have also experimented with DMT
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Provisioning xDSL
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In the following figures, the various architectures of the xDSL implementations are shown The point to remember here is the goal of xDSL is to use the existing copper infrastructure and improve the speed and throughput on the installed base of wires Consequently, the installation process at-tempts to minimize the added equipment (particularly at the customer s premises) and the labor required to get the equipment installed In Figure 16-10 , the design of an ADSL model and the model components are shown The intent of the model is to show the infrastructure of the network from the customer premises to the network provider This model also shows the splitters in place to facilitate the ADSL model
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Figure 16-10: The ADSL model as it is laid out from the customer premises to the service provider The next figure demonstrates the connection from the service provider to the rest of the world In many cases, ADSL access to the local network access provider (the ILEC or other local loop provider) is then passed on to the ISP This is designed to run over an ATM backbone, but not a firm requirement Therefore, the NAP will assign a DSL Access Multiplexer card (DSLAM) and assign an ATM VPI and VCI as a default to carry the data into the Internet Service Provider ( ISP) or other Network Service Provider (NSP) This is shown in Figure 16-11
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Figure 16-11: Access from the NAP to the NSP
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The application most commonly used is to gain high-speed access to the Internet Many of the local service providers install the ADSL service into a single PC at the end user location, as shown in Figure 16-12 The local providers offer the customer a packaged deal with the following components:
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