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Serial connections are most appropriate when traffic is constant and service is required on demand A dedicated circuit and Frame Relay connection are two types of serial connections that would use a serial interface on a router Prior to establishing communication between two serial interfaces, you need to know three things: the device type, the signal type, and the connector type 1Determine whether the device is of type Data Terminal Equipment (DTE) or Data CircuitTerminating Equipment (DCE) Serial connections usually need to be terminated in a DCE Typically, however, a router is of type DTE, and so you need to have additional hardware to support this circuit termination An example of a DCE is a CSU/DSU The DCE will provide a clocking signal to synchronize the data prior to passing it on to the DTE Figure 4-10 illustrates a typical serial connection

If a system does not employ some protocol that ensures deadlock freedom, then a detection and recovery scheme must be used An algorithm that examines the state of the system is invoked periodically to determine whether a deadlock has occurred If one has, then the system must attempt to recover from the deadlock To do so, the system must: Maintain information about the current allocation of data items to transactions, as well as any outstanding data item requests Provide an algorithm that uses this information to determine whether the system has entered a deadlock state Recover from the deadlock when the detection algorithm determines that a deadlock exists In this section, we elaborate on these issues

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The McGraw Hill Companies, 2001

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Figure 4-10: DTE/DCE relationship Channel Service Unit (CSU) is a device used in digital transmission; it connects network devices to the local digital telephone loop Data Service Unit (DSU) is a device used in digital transmission that connects the physical interface on the network device to the transmission circuit (for instance, T1) The DSU is also responsible for signal timing These two devices are often referenced together as a CSU/DSU TipCisco does offer serial interfaces with a built-in CSU/DSU on some routers The router can function as both a DTE and DCE An internal CSU/DSU eliminates extra external perimeter devices and cables 2Determine the type of signal being used A standard serial interface is used to connect communication devices such as a CSU/DSU The CSU/DSU then connects to a network device such as a router Some type of signal is needed to allow communication between the CSU/DSU and the router The most common serial-interface signal is the EIA-232 standard (formally known as RS-232) There are other signals, as well, depending on your equipment, distance, and speed requirements The different signals and their corresponding properties are listed in Table 4-6 Table 4-6: Serial Signal Properties

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Deadlocks can be described precisely in terms of a directed graph called a wait-for graph This graph consists of a pair G = (V, E), where V is a set of vertices and E is a set of edges The set of vertices consists of all the transactions in the system Each element in the set E of edges is an ordered pair Ti Tj If Ti Tj is in E, then there is a directed edge from transaction Ti to Tj , implying that transaction Ti is waiting for transaction Tj to release a data item that it needs When transaction Ti requests a data item currently being held by transaction Tj , then the edge Ti Tj is inserted in the wait-for graph This edge is removed only when transaction Tj is no longer holding a data item needed by transaction Ti A deadlock exists in the system if and only if the wait-for graph contains a cycle Each transaction involved in the cycle is said to be deadlocked To detect deadlocks, the system needs to maintain the wait-for graph, and periodically to invoke an algorithm that searches for a cycle in the graph To illustrate these concepts, consider the wait-for graph in Figure 1618, which depicts the following situation: Transaction T25 is waiting for transactions T26 and T27 Transaction T27 is waiting for transaction T26 Transaction T26 is waiting for transaction T28 Since the graph has no cycle, the system is not in a deadlock state Suppose now that transaction T28 is requesting an item held by T27 The edge T28 T27 is added to the wait-for graph, resulting in the new system state in Figure 1619 This time, the graph contains the cycle T26 T28 T27 T26 implying that transactions T26 , T27 , and T28 are all deadlocked Consequently, the question arises: When should we invoke the detection algorithm The answer depends on two factors: 1 How often does a deadlock occur 2 How many transactions will be affected by the deadlock.

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The McGraw Hill Companies, 2001

If deadlocks occur frequently, then the detection algorithm should be invoked more frequently than usual Data items allocated to deadlocked transactions will be unavailable to other transactions until the deadlock can be broken In addition, the number of cycles in the graph may also grow In the worst case, we would invoke the detection algorithm every time a request for allocation could not be granted immediately

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