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The question is: where do the connections come from This seemingly simple question actually has profound implications for the future of not only frame relay networks, but also all connectionoriented networks in general This book has already pointed out that there are really two distinct types of virtual circuits The permanent virtual circuit (PVC) is the packet-switching equivalent of the leased private line The PVC is available 24 hours a day, seven days a week, so there is always a path established through the network from A to B But there are also switched virtual circuits (SVC) as well The SVC is the packet-switching equivalent of a dialup modem connection The SVC is only available after a connection phase or call setup phase, which takes some finite amount of time for the network to complete, so it is not really transparent to the user.

When the ID number is found, the customer s name, address, and phone number are copied into the appropriate fields in the primary database Lookups have some drawbacks: The looked-up data is physically copied from the secondary database into the primary database, resulting in data duplication and additional storage requirements If the data in the secondary file changes, the primary data does not change unless you reexecute the lookup Even if multiple matches exist for the key field, FileMaker identifies only the first match that it finds and then uses its data On the other hand, lookups have one feature that s occasionally very useful Looked-up data that is copied into the primary file will not change unless you trigger the lookup a second time or do a blanket relookup for the found set (described later in Performing a relookup ) Sometimes this is exactly what you want.

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Figure 8.6 The extended UNI from the LEC perspective. The IXC is now reduced to the role of providing a private line to the LEC frame relay switch in another LATA. Although a different LEC is shown in the figure, both LECs in the extended UNI arrangement are typically the same. The extended UNI is simple, needs no NNI agreements with the IXCs, and allows LEC to compete with IXCs for interLATA frame relay business. However, the cost of the IXC leased line can be high, but much depends on distance and area of the United States.

For example, looked-up price information in an invoice shouldn t change when the prices change (You can t pass on an after-the-fact price increase) Lookups are discussed in the second part of this chapter When lookups aren t the answer to your development needs, you can use relationships instead The advantages of relationships include the following: Related data is not copied into the primary table; it is merely referenced This avoids unnecessary duplication Related data is automatically updated whenever it changes You don t have to do anything to trigger an update In addition to the one-to-one correspondence between records that is offered by lookups, relationships can be one-to-many By using a general field, such as Department as a key field, multiple matching records can be drawn from the related table (all personnel in the Accounting Department, for instance)..

where the subscript b represents the beam current and voltage, d is the discharge current and voltage, ck is the cathode keeper current and voltage, nk is the neutralizer keeper current and voltage, Al represents beam ions incident on the accel grid, A2 represents charge exchange ions at the accel grid potential V, , ID,, represents the decel grid (if present) current from beam ions, and I D E 2 represents the decel grid current from backstreaming ions from the beam plume. In reality, the accel and decel grid power are very small compared to the other power levels in the thruster. The power that must be dissipated by the thruster is Eq. (2.6.2) minus the beam power:

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