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In order to avoid most common problems with server overload, transition problems, system interoperability, security threats, and lack of data privacy, it is necessary to make PONs, and EPONs specifically, immune to most common types of security breaches, including passive monitoring, data mining, masquerading, ToS, and certain variants of DoS or distributed DoS (DDoS) attacks. Hardware-level attacks cannot be avoided without introducing a dynamic wavelength management system, which is currently both expensive and unwieldy. A lot of work is, therefore, required to provide viable and simultaneously efficient means for assuring subscriber data privacy and authentication, as well as antimonitoring measures, preventing any attempts at passive data-mining techniques, which typically constitute the first step in launching a more destructive attack on the EPON system.

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The BRI interface offers 2B + D. The PRI provides 23B + D and, in this case, all are 64 KB/s channels. This should sound familiar. What technology provides 24 64-KB/s channels Of course, the answer is T1. The physical interface for PRI then is simply a T1. Technically, it is a T1 with extended superframe (ESF) framing. The obvious question is, How is PRI different from an ordinary T1 The answer is that at the physical interface it isn t any different. Channel 24 now becomes the signaling channel. One might say that we have added common channel signaling to the T1. PRI then is frequently used for a PBX interface where the full signaling capability of the D channel is needed. Figure 9-2 shows the S/T interface components for PRI. This same figure is then used to describe the BRI and PRI interfaces, but because it is a T1, we can add familiar labels to the diagram components. The NT1 is now a CSU, and the NT2 is now a PBX. It could also be a router, but typically routers are members of dedicated networks and don t use switched channels. The Telcos charge more for a PRI because it offers many more switched-channel features. If a router needs to be connected to another router, an ordinary T1 will do fine and cost less. Circumstances will occur when we need both our router and another device on the same interface and will periodically adjust the amount of bandwidth to each. For this unique application, PRI is ideal. If we stick with our PBX example, the NT2 creates multiple S/T interfaces for TE1 or TA devices. TE1s are ISDN BRI telephones. What is interesting about the definition of the PRI interface is that it isn t limited to a single T1. Multiple T1s can be added to the PRI, so that up to 20 T1s can be part of a single interface and all would be controlled by the single 64-KB/s D channel on the first T1. That is, 479 switched B channels could be controlled by a single D channel.

11.15. The CD includes a multimedia demonstration of displaying interface statistics on an IOS device.

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Menus may be composed of multiple pages, with a page being defined as a composite interactive display. As there can only be one page displayed at a time, all menu elements need to be contained therein. This includes all buttons with the various states normal, selected, activated and all other displayed graphics. As Figure 6.13 depicts, the first page may show the main menu in its starting layout with all submenus collapsed. Page 2 would show the main menu including the submenu items for the audio settings, page 3 would show the submenu items for the scene selection, and so on. This approach is flexible and scalable, but requires the necessary programming logic to make sure that the appropriate page is shown at any given time. Figure 6.13 HDMV Multipage Menu Example

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