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Another example of a nonperiodic composite signal is the signal received by an old-fashioned analog black-and-white TV A TV screen is made up of pixels (picture elements) with each pixel being either white or black The screen is scanned 30 times per second (Scanning is actually 60 times per second, but odd lines are scanned in one round and even lines in the next and then interleaved) If we assume a resolution of 525 x 700 (525 vertical lines and 700 horizontal lines), which is a ratio of 3: 4, we have 367,500 pixels per screen If we scan the screen 30 times per second, this is 367,500 x 30 = 11,025,000 pixels per second The worst-case scenario is alternating black and white pixels In this case, we need to represent one color by the minimum amplitude and the other color by the maximum amplitude We can send 2 pixels per cycle Therefore, we need 11,025,000/2 = 5,512,500 cycles per second, or Hz The bandwidth needed is 55124 MHz This worst-case scenario has such a low probability of occurrence that the assumption is that we need only 70 percent of this bandwidth, which is 385 MHz Since audio and synchronization signals are also needed, a 4-MHz bandwidth has been set aside for each black and white TV channel An analog color TV channel has a 6-MHz bandwidth

Over the last 150 years, mass visual communication emerged alongside print, then began shoving it aside and reaching a dominance that couldn t have been imagined earlier

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Around the time that Gigabit Ethernet first started to appear, two problems began to surface with ST and SC connectors First, ST connectors are relatively large, twist-on connectors, requiring the installer to twist the cable when inserting or removing a cable Twisting is not a popular action with fiber-optic cables, as the delicate fibers may fracture Also, big-fingered techs have a problem with ST connectors if the connectors are too closely packed: they can t get their fingers around them SC connectors snap in and out, making them much more popular than STs However, SC connectors are also large, and the folks who make fiber networking equipment wanted to pack more connectors onto their boxes This brought about two new types of fiber connectors, known generically as Small Form Factor (SFF) connectors The first SFF connector the Mechanical Transfer Registered Jack (MT-RJ), shown in Figure 5-8 gained popularity with important companies like Cisco and is still quite common

In addition to being represented by an analog signal, information can also be represented by a digital signal For example, a I can be encoded as a positive voltage and a 0 as zero voltage A digital signal can have more than two levels In this case, we can

send more than 1 bit for each level Figure 316 shows two signals, one with two levels and the other with four Figure 316

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The second type of popular SFF connector is the Local Connecter (LC), shown in Figure 5-9 LC-type connectors are very popular, particularly in the United States, and many fiber experts consider the LC-type connector to be the predominant fiber connector

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We send 1 bit per level in part a of the figure and 2 bits per level in part b of the figure In general, if a signal has L levels, each level needs log2L bits

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LC and MT-RJ are the most popular types of SFF fiber connections, but many others exist, as outlined in Table 5-1 The fiber industry has no standard beyond ST and SC connectors, which means that different makers of fiber equipment may have different connections

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A root server is a server whose zone consists of the whole tree A root server usually does not store any information about domains but delegates its authority to other servers, keeping references to those servers There are several root servers, each covering the whole domain name space The servers are distributed all around the world

DNS defines two types of servers: primary and secondary A primary server is a server that stores a file about the zone for which it is an authority It is responsible for creating, maintaining, and updating the zone file It stores the zone file on a local disk A secondary server is a server that transfers the complete information about a zone from another server (primary or secondary) and stores the file on its local disk The secondary server neither creates nor updates the zone files If updaJing is required, it must be done by the primary server, which sends the updated version to the secondary The primary and secondary servers are both authoritative for the zones they serve The idea is not to put the secondary server at a lower level of authority but to create redundancy for the data so that if one server fails, the other can continue serving clients Note also that a server can be a primary server for a specific zone and a secondary server for another zone Therefore, when we refer to a server as a primary or secondary server, we should be careful to which zone we refer

Twinax Variable LC is common Variable LC, SC are common RJ-45

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