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A front-end switch is a very simple type of switch that sits between a series of CO lines (its trunks or network interface devices) and a corresponding number of telephone stations (its extensions or station devices) No switching takes place between extensions The switch is capable only of establishing calls to connect (and disconnect) each extension to (and from) its designated trunk A front-end switch may be modeled as illustrated in Figure 10-2 In the illustration, network interface devices are labeled with an "N," logical device elements are labeled with an "L," and physical device elements are labeled with a "P" Potential calls are shown in gray

A public-key cryptography algorithm works by encrypting data with a public key and then decrypting data with a private key The public key of the key pair encrypts the data, and only the associated private key of the key pair can decrypt the data Since Melissa has Mike s public key, Melissa can encrypt and send a message to Mike that only Mike s private key can decrypt Mike can then decrypt the message (Figure 11-8)

The labs( ) function returns the absolute value of num Example This function converts the number entered at the keyboard into its absolute value:

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The main purpose for a front-end switch is providing a more sophisticated user interface to otherwise very primitive subscriber lines from another switch This is accomplished by making the extension lines proprietary digital (or proprietary second pair) so that more sophisticated proprietary telephone stations can be used, or by providing a CTI interface on the front-end switch The call processing function in the front-end switch accepts commands from the proprietary stations or the CTI interface and translates them into appropriate commands for the CO switch This type of switch is a very attractive way of providing Centrex services to a particular office or location An appropriate front-end switch can be connected to a T-1 line from the CO switch, so that the telephone company need only provide four wires to an entire location of 24 or fewer users Instead of accessing Centrex functionality through DTMF sequences that have to be memorized, Centrex telephone users at the location take advantage of sophisticated telephone stations, computer interfaces, or a combination of the two (CTI configurations like this one are presented in 11)

A Web server is a computer that delivers (or serves up) Web pages Web servers listen on port 80, fetching requested HTML pages and sending them to browsers You can turn any computer into a Web server by installing server software and connecting the machine to the Internet, but you need to consider the operating system and Web server program you ll use to serve your Web site Microsoft pushes Internet Information Services (IIS), shown in Figure 9-16 IIS enables you to set a maximum connection limit on your Web server based on available bandwidth and memory This enables you to protect your network against an

long int get_labs() { char num[80]; gets(num); return labs(atol(num)); }

#include <stdlibh> long long int llabs(long long int num);

Figure 9-16

Telephone equipment vendors make the products that connect to telephone networks, as well as to the telephone equipment of other vendors Telephone equipment vendors include companies that develop, manufacture, and sell: Consumer telephone sets and systems Business telephone sets and systems Cellular and other wireless telephone sets Pay telephones Computer peripherals, add-ons, and subsystems for interfacing with telephone networks Special-purpose telephony equipment

The llabs( ) function returns the absolute value of num It is similar to labs( ) except that it operates on values of type long long int Related Functions abs( ) and labs( ) ldiv

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