barcode generator in vb.net Figure 5-3 Layout of typical DSL. in Software

Generate EAN / UCC - 13 in Software Figure 5-3 Layout of typical DSL.

Figure 5-3 Layout of typical DSL.
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Figure 5-4 DSL Splitter.
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When a PC wants to transmit data across the local loop, the traffic is encoded in the higher frequency band reserved for data traffic. The ADSL modem knows to do this because the traffic is arriving on a port reserved for data devices. Upon arrival at the CO, the data traffic does not travel to the local switch; instead, it stops at the ADSL modem that has been installed at the CO end of the circuit. In this case, the device is actually a bank of modems that serves a large number of subscribers and is known as a Digital Subscriber Line Access Multiplexer (DSLAM) (pronounced dee-slam ). A DSLAM is shown in Figure 5-5. Instead of traveling on to the local switch, the data traffic is now passed around the switch to a router, which in turn is connected to the Internet. This process is known as a line-side redirect. The advantages of this architecture are fairly obvious. First, the redirect offloads the data traffic from the local switch so that it can go back to doing what it does best, switching voice traffic. Second, it creates a new line of business for the service provider. As a result of adding the router and connecting the router to the Internet, the service provider instantly becomes an ISP. This is a near-ideal combination, because it enables the service provider to become a true service provider by offering much more than simple access and transport. As the name implies, ADSL provides two-wire asymmetric service; that is, the upstream bandwidth is different from the downstream. In the upstream direction, data rates vary from 16 to 640 Kbps, whereas the downstream bandwidth varies from 1.5 to 8 Mbps. Because most applications today are asymmetric in nature, this disparity poses no problem for the average consumer of the service.
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Figure 5-5 A bay of DSLAMs.
5
A Word about the DSLAM
This device has received a significant amount of attention recently because of the central role that it plays in the deployment of broadband access services. Obviously, the DSLAM must interface with the local switch so that it can pass voice calls on to the Public Switched Telephone Network (PSTN). However, the DSLAM often interfaces with a number of other devices as well. For example, on the customer side, the DSLAM may connect to a standard ATU-C, directly to a PC with a built-in Network Interface Card (NIC), to a variety of DSL services, or to an integrated access device of some kind. On the trunk side (facing the switch), the DSLAM may connect to IP routers as described, to an Asynchronous Transfer Mode (ATM) switch, or to some other broadband service
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provider. It therefore becomes the focal point for the provisioning of a wide variety of access methods and service types.
High Bit Rate Digital Subscriber Line (HDSL)
The greatest promise of HDSL is that it provides a mechanism for the deployment of four-wire T1 and E1 circuits without the need for span repeaters, which can add significantly to the cost of deploying data services. It also means that service can be deployed in a matter of days rather than weeks, something customers certainly applaud. DSL technologies in general enable repeaterless facilities as far as 12,000 feet, while traditional four-wire data circuits such as T1 and E1 require repeaters every 6,000 feet. Consequently, many telephone companies are now using HDSL behind the scenes as a way to deploy these traditional services. Customers do not realize that the T1 facility that they are plugging their equipment into is being delivered using HDSL technology. The important thing is that they don t need to know. All the customer should have to care about is that a SmartJack is installed in the basement, and through that jack they have access to 1.544 Mbps or 2.048 Mbps of bandwidth, period.
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