how to generate qr code using vb.net PDH Networks 176 Wide Area Networks in Software

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PDH Networks 176 Wide Area Networks
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Figure 739 By utilizing the network overhead bits in a DS3, C-Bit frame error isolation can be performed in-service The point where both the C-bit and P-bit errors occur indicates the faulty leg
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PCM and Digital Transmission Systems by Frank FE Owen, McGraw-Hill 1988, ISBN 0-07-047954-2 Testing Sub-rate Data Services, Hewlett-Packard Application Note 1211-3 (Publication number 50912072E)
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Source: Communications Network Test and Measurement Handbook
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Frame Relay
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Introduction Frame relay is a highly efficient technology for routing data over wide area networks (WANs) Users from all segments of industry implement frame relay to improve performance, cut cost, simplify their networks, and improve reliability Typical frame relay applications link remote local area networks (LANs) to central databases and other resources (Figure 81) Both ANSI and the ITU-T have established recommendations
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Frame Relay Network FRS FRS
PVC FRAD FRAD
Figure 81 The typical application for frame relay involves internetworking local area networks To ac-
complish this, frame relay makes use of frame relay access devices (FRADs) and a set of dedicated frame relay switches FRSs) In most applications, frame relay uses permanent virtual circuits (PVCs)
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Frame Relay 178 Wide Area Networks
for frame relay, and the Frame Relay Forum has ratified a number of Implementation Agreements that have been widely accepted
811 Frames
Frame relay is one of several Data Link layer (OSI layer 2) protocols, which are based on the High-Level Data Link Control (HDLC) bit-oriented protocol These protocols are employed to organize user data in such a way that information of any type can be transferred error-free through the network To do this, the user data are encapsulated between header octets (which provide addressing and control information) and error-checking octets This procession of octets the address, control field, user data, and error-check sequence is called a frame Each frame is separated from other frames by the use of a special idle character When no frames are being transmitted on the link, this idle character is transmitted continuously to indicate the idle condition The appearance of a character other than an idle character normally signals the start of a frame When idle characters again appear, it indicates the end of a frame
812 Frames relayed
Frame relay is a term that arises out of the Fast Packet Concept This concept embraces the integration of voice, video, and data, and is the conceptual framework for the high-speed digital communications that emerged in the 1990s In this concept there are two chief ways of transferring, or relaying, information in networks: 1 Frames, as defined above These may be of sufficient length to contain the entire user message 2 Cells, which are of fixed length These often require the user information to be fragmented for transfer and reassembled at the destination The term frame relay thus refers to the passing of link-layer frames from one point to another in an information network; it is in contrast to cell relay, which refers to the transfer of fixed-length messages and is the basis for communications methods such as Asynchronous Transfer Mode (ATM), discussed elsewhere in this book Since frame relay usually transfers user information intact, the process of fragmentation and reassembly can be avoided This reduces processing requirements and makes it easier for frame relay to be adapted to existing network architectures and infrastructures The simple format of the frame relay frames also means that the overhead can be very low, resulting in a very efficient use of the available bandwidth The simplicity and efficiency of frame relay leads to easy, inexpensive implementation, and is the key to frame relay s rapid deployment and widespread use
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