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Objectives 4.1 Introduction 4.2 Fiber-Optic Trunking and Cable Television Applications 4.3 Fiber-Optic Construction and Installations 4.4 Aerial Electronic Equipment Summary Questions Problems

TCP and UDP support the two primary types of Internet-based communication: that which requires highly reliable and ordered message delivery, and that which has a high tolerance for lost messages TCP and UDP are uniquely designed for these two scenarios TCP TCP is a highly reliable messaging protocol that is used in situations where high-integrity messaging is required The main characteristics of TCP-based network traffic are: Unique connections The TCP protocol utilizes what is known as a connection between two stations It supports several concurrent connections between any two stations Guaranteed message integrity The TCP protocol performs checks on the sent and received packets to ensure that the packet arrived at its destination fully intact If the checksum indicates that the packet was altered in transit, the TCP protocol will handle retransmission Guaranteed delivery The TCP protocol guarantees message delivery.

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This means that if an application sends a message to another application over an established TCP connection and the function sending the message receives a success code from the operating system, then the message was successfully delivered to the destination system This is contrasted with the message delivery used by UDP that is discussed later in this section Guaranteed delivery sequence Packets sent using the TCP protocol include sequence numbers so that the destination system can assemble arriving packets into the correct order This guarantees that an application receiving packets from a sending application over TCP can be confident that packets are arriving in the same order in which they were sent UDP UDP is a lightweight messaging protocol used in situations where speed and low overhead are more important than guaranteed delivery and delivery sequence Unlike the connection-oriented TCP protocol, UDP is connectionless.

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Splicing and connectorizing optical ber into a network is crucial to the operation of a ber-optic communication system Since the optical ber exhibits such low loss over a distance, a system should not allow losses to accumulate from the necessary splices and connectors Prudent designers should order suf cient optical cable for segments that require a branching or termination point Since connectors are required at stations in the system, extra splices along the way should be avoided The quality of splicing and of connectors should be good so that the accompanying loss is held to a minimum A variety of connectors are available for connecting a system But a good design dictates that the variety of connectors should be minimized This means that personnel will not have to be trained for different connectors Also, stocking a variety of connectors and the necessary tooling can be avoided 4.

This means that UDP does not need to set up a connection between sending and receiving systems before messages can be sent; instead, the sending system just sends its messages to the destination system Like TCP, messages can be sent to a specific port number on a destination system UDP does nothing to assure order of delivery Hence, it is entirely possible that packets may arrive at the destination system out of order In practice, this is a rarity, but the point is that UDP does not make any effort to reassemble packets into their original order upon arrival Furthermore, not only does UDP not guarantee the sequence of delivery, but it also does not even guarantee that the destination system will receive a packet In UDP, when an application sends a message to a target system, the success error code returned by.

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