inconsistently at best according to reports, a modest gain in performance. However, the bandwidth limitations of voice band lines are not a function of the subscriber line but the core network. Filters at the edge of the core network limit voice-grade bandwidth to approximately 3.3 kHz. Without such filters, the copper access wires can pass frequencies into the MHz regions. Attenuation determines the data rate over twisted-pair wire, and it, in turn, is a function of line length and frequency. Table 1 indicated the practical limits on data rates in one direction compared to line length.
ATM (Asynchronous Transfer Mode) A multiplexing and routing technology for high-speed digital communications that permits data, text, voice, video and multimedia signals to be transmitted simultaneously between network access points at speeds of up to 155 Mbps or more. ATM allows for better local area network interconnections, PABX interconnection, data transmission and flexible bandwidth delivery. Base station Fixed transceiver equipment in each cell of a mobile
ADSL has proved a significant step in the development of digitalsubscriber line (DSL) technology, as it has probably the best defined standard (IEEE Standard T1.413-1995 ) that is actually implemented de facto in the telecommunications in- dustry, by both service providers and chip manufacturers alike. Bingham  and Cioffi  describe the development of the philosophy for ADSL and similar broad-band approaches, and Goralski  and Chen  provide background to the technology area to high-speed communications. It is beyond the scope of this paper to go into detail of the mechanism of the ADSL system, but it is useful to describe some details of the transmis- sion scheme and the analog interface to understand the require- ments for ADSL line transformers.
2.3 Where an active telephone service is provisioned in conjunction with an Internet service the Customer can access the emergency services free of charge by dialling 999 or 112. When the Customer dials the emergency numbers, to comply with regulations, eir will forward the installation address details of the calling number to the emergency services. Where the Customers is using a DECT Phone (Digital Cordless Telephone), which requires an electric power supply, the Customer may be unable to make calls, in the event of a power interruption or outage at or to the Premises. Where an Internet only service is provisioned and there is no active telephone service, the Customer will not have access to emergency service numbers. It should be noted that a customer availing of Standalone Broadband will not have the use of a working PSTN line and therefore any ancillary services that were originally connected to the PSTN line will be incompatible with Standalone Broadband e.g. on monitored alarms that go into monitoring stations and use dial up access to transmit alarms, medical alarms, Sky TV Box, Credit card machines or any other ancillary services connected to the PSTN line (“Ancillary Service”)’. eir accepts no responsibility for the consequences of an Ancillary Service including any monitoring alarm failing to operate as per specification after Standalone Broadband is installed.
Asymmetricdigitalsubscriber line (ADSL) uses existing twisted pair telephone lines to create access paths for high-speed data communications and transmits at speeds up to 8.1 Mbps to a subscriber. This exciting technology is in the process of overcoming the technology limits of the public telephone network by enabling the delivery of high-speed Internet access to the vast majority of subscribers’ homes at a very affordable cost.
In a digital search tree strings are directly stored in internal nodes. More precisely, the root contains the first string and the next string occupies the right or the left child of the root depending on whether its first symbol is “0” or “1”. The remaining strings are stored in available nodes which are directly attached to nodes already existing in the tree (external nodes). A digital search tree with n internal nodes is completed with n + 1 external nodes. These external nodes can be seen as those positions where the next item can be stored. The resulting tree is then a complete binary tree with the external nodes as leaves. The search for an available node follows the prefix structure of a new string . Figure 1 shows a digital search tree built on eight strings s 1 , ..., s 8 (i.e., s 1 = 0...,
4. Subscriber acknowledges that if COMPANY utilizes a digital communicator for the purposes of sending alarm signals from Subscriber's premises to COMPANY’S Central Station, that the signals from Subscriber's alarm system are sent over Subscriber's regular telephone service to COMPANY’S Central Station, and in the event Subscriber's
In this we improvement in WiMAX network using MDU and VDSL2 using QAM and QPSK modulation techniques and for simulation purpose we had taken RIVERBED Simulator. RIVERBED Simulator was used to analyze the performance of WiMAX for IPTV services. In these scenarios Subscriber is moving with different mobility patterns. In first scenario the mobility pattern of nodes is random and in second scenario the mobility pattern of nodes is along the trajectory. These scenarios are repeated for different modulation techniques (QAM, QPSK). To compare this SVC code is used. In our simulation we had taken 9Square cells. Each cell has a radius of 10 Km. In each cell there is one Base station and 20 mobile nodes. These nodes are circularly placed. The BS connected to the IP backbone via a SONET OC1 link. The server node is also connected to backbone using ppp-sonet-oct1 link.
We present an equivalent linear complementarity problem (LCP) formulation of the noncooperative Nash game resulting from the DSL power control problem. Based on this LCP reformulation, we establish the linear convergence of the popular distributed iterative waterfilling algorithm (IWFA) for arbitrary symmetric interference environment and for certain asymmetric channel con- ditions with any number of users. In the case of symmetric interference crosstalk coeﬃcients, we show that the users of IWFA in fact, unknowingly but willingly, cooperate to minimize a common quadratic cost function whose gradient measures the received signal power from all users. This is surprising since the DSL users in the IWFA have no intention to cooperate as each maximizes its own rate to reach a Nash equilibrium. In the case of asymmetric coeﬃcients, the convergence of the IWFA is due to a con- traction property of the iterates. In addition, the LCP reformulation enables us to solve the DSL power control problem under no restrictions on the interference coeﬃcients using existing LCP algorithms, for example, Lemke’s method. Indeed, we use the latter method to benchmark the empirical performance of IWFA in the presence of strong crosstalk interference.
Many opportunities lie ahead. To get you started, this Subscriber Guide includes the information you will need to begin using and optimizing your connection. It outlines the terms and conditions of service, and provides current details on connections, services, and contact information for network staff to assist you. As our relationship evolves, we will support you with access to tools, potential technology partners and discussion venues that will help you explore new ways to interact with and engage the communities you serve.
The subscriber name is the key information for the subscriber. Once you have entered the key information you can close the wizard by selecting Finish, but you still may need to configure other parameters before you have a valid configuration. For example, you may want to create a subscriber, and then go on to specify a service bundle in the Service Library view, returning later to associate the service bundle with the subscriber.
Muhammad Adnan Tariq et all proposed “Securing Broker-Less Publish/Subscribe Systems Using Identity-Based Encryption” in 2014.In this paper, a new approach is provide for authentication and confidentiality in a broker-less content based pub/sub system. The approach is highly scalable in terms of number of subscribers and publishers in the system and the number of keys maintained by them. They adapted techniques from identity based encryption 1) to ensure that a particular subscriber can decrypt an event only if there is a match between the credentials associated with the event and its private keys and 2) to allow subscribers to verify the authenticity of received events.
Alliant Telecom of Canada decided in the early ‘90s to transform themselves from a traditional telephone company into a multimedia service company. They could see that revenues from fixed-line telephone and other narrowband services were falling under the dual pressures of commoditization and competition from other carriers and mobile operators. Alliant launched its first new service offering in 1996: high-speed Internet access utilizing its all-digital, all-fiber network. Then in 2000, Alliant was the first company in North America to launch a commercial interactive digital TV service over the same telephone connection as the Internet and voice service. Introduction of high-margin digital TV service incrementally doubled average revenue per subscriber as shown in Figure 1.
Carrier Equipment To multiplex the ADSL lines and translate data to ATM or other links, carriers have two approaches. First, rack-mount modems called DSL Access Multiplexers (DSLAM) have multi-port ADSL cards and multiplex the signals to a fatter ATM or Frame Relay pipe. The other approach for is to use ADSL line cards in Digital Loop Carriers (DLC) or Remote Terminals (RT). Carriers increasingly use DLCs to act as a first stage of subscriber-line concentration. New-generation DLCs such as those from Advanced Fibre Communications have extremely high bandwidth and mix-and-match capabilities for offering various data services.
5. Since, these regulations were not specifically evolved keeping in view the Digital Addressable Cable TV Systems, the Authority identified certain issues for consultation with the stakeholders. The issues for the consultation pertain to provisions for connection, disconnection, transfer and shifting of the cable TV services, procedure for handling subscriber’s complaints and redressal of complaints, procedure for obtaining/supplying the set top box, procedure for changing the positioning of channels/and/or taking the channel/s off-air etc., procedure for payment of bills, demarcation of obligation and responsibilities for multi-system operators and local cable operators for ensuring quality of services at the subscriber level.
Overlay networks in China Telecom have been deployed for reasons that remain unchanged to this day. First, the size of China Telecom network causes that deployment of new technologies occurs in phases. Moreover, when this type of deployment is adopted, investment is finished after each phase. Third, under any scenario, replacing about 200 million digital switch lines would take a long time. Unlike BT, which prefers a next generation network solu- tion that supports the new as well as old services, China Telecom will not adopt old services in its network. In- terworking in the existing PSTN network is based on new requirements, but old services, such as narrow-band POTS need not be supported by the next generation network plat- form.
The first step for an ISP in offering any new service is taking the time to define the business opportunity. This is a direct outgrowth of any ISP’s business, which is to know their subscriber base. In addition to determining the geographic distribution and numbers of subscribers, with DSL it is also necessary to know which of the types of DSL service will appeal to them. Since many DSL providers do not necessarily offer all the different variants of DSL, the type of service a subscriber base needs will form part of the wholesale provider selection criteria.