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Weather dependency/link distance Weather is undoubtedly the most significant shortcoming of optical wireless technology. Severe weather conditions such as heavy fog can cause significant outage of FSO links. Moderate weather conditions such as light fog or rain can cause outages of most FSO links operating at distances over 1 km. The link distance can be traded off for better weather tolerance. However, the shorter link distance in itself becomes a shortcoming. Mesh architecture complements these limitations of optical wireless by allowing for the creation of reliable networks using short-range FSO links. Line-of-sight requirement Optical wireless is a line-of-sight (LOS) technology, a shortcoming that limits the scope of its applications. The shortcoming is, however, somewhat complemented by the mesh networking technology that allows for connecting two points that are not in LOS of each other through an intermediate point, though this solution is not practical for all applications. Lack of industry standard The lack of a coherent industry standard is one of the significant shortcomings of FSO solutions.

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Console.WriteLine("Hypotenuse is " + z); } }

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When voice is to be carried on IP, it is UDP that is used rather than TCP. Why should UDP, an inherently unreliable protocol, be chosen over TCP, a protocol than ensures ordered delivery without loss of data The answer is related to the characteristics of speech itself. In a conversation, the occasional loss of 1 or 2 packets of voice, while not very desirable, is certainly not a catastrophe, since voice traffic will generally use small packets (10 to 40 milliseconds in duration). Obviously, modern voice-coding techniques operate better if no packets are lost, but the coding and decoding algorithms do have the capability to recover from losses, such that the occasional lost packet does not cause major degradation. On the other hand, voice is very delay sensitive. Anyone who has made a phone call over a satellite connection, where the round-trip time may be many hundreds of milliseconds, knows how annoying a delay can be. Unfortunately, the connection setup routine in TCP and TCP s acknowledgment routines introduce delays, which should be avoided. Even worse, in the case of lost packets, TCP will cause retransmission and thereby introduce even more delay. Tolerating some packet loss is far better than introducing a significant delay in voice transmission. So how much packet loss is tolerable Packet loss of about 5 percent is generally acceptable, provided that the lost packets are fairly evenly spaced. A problem can arise, however, if groups of successive packets are lost. This problem can be alleviated if resource management and reservation techniques are used. These techniques generally involve the allocation of a suitable amount of resources (bandwidth and buffer space) before a call

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If your scanner is a simple keyboard wedge then you're hosed. ... There should be several pages of barcodes that doing programming. .... Which is why he needs to write logic to differentiate between keyboard and scanner . ... pasting or subclassing the Win32 textbox wrapped by the WinForms textbox.

As to which of the two are used, that depends on the application. And as to when a UDP session is over, that is also application-specific:

If num is positive, the value is displayed with two decimal places. If num is negative, the value is displayed with two decimal places and is between a set of parentheses. If num is zero, the string 0.00 is displayed. When using the separators, you don t need to supply all parts. If you just want to specify how positive and negative values will look, omit the zero format. (In this case, zero is formatted as a positive value.) Alternatively, you can omit the negative format. In this case, the positive format and the zero format will be separated by two semicolons. This causes the positive format to also be used for negative values.

The output from this program is shown here:

Nouns of quantity allow for a measurement based on weight or the type of container as shown here:

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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