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We are connected to the Internet and specifically permit access to our network (or portions of our network) by our customers. We are now at risk from all sorts of hackers, crackers, and freaks. The goal then is to keep them out (or at least slow them down and make them work for it), while giving our friends and customers free that is, unfettered access. The first step then is to install a firewall. A firewall is simply a machine whose job it is to examine each packet arriving and verify whether it is permitted, based on a set of rules. This set of rules is referred to as the rule base. Firewalls essentially operate at the IP and TCP levels of the protocol stack. This means that the firewall examines each packet to see if it is coming from and going to the proper IP address, and that it contains the proper or permitted TCP port number. You can set up firewalls to be a one-way valve. If you do this, your employees can surf the net at will and send out any kind of packet, but your firewall will not permit any unsolicited packets. (This means that mail won t work, for example, the firewall won t let in any packets including mail.) The other problem with this approach is that it will permit your employees to hack on the Net. If they are caught, the corporation may be liable, so think about this issue. This is not to say that firewalls are not useful, but to point out that simplistic solutions will not achieve your objectives. Performing basic packet filtering on source and destination IP address is a useful feature when combined with additional firewall capabilities. It was initially believed that a firewall was the solution to all our Internet security problems. The limitations of a firewall-only implementation are now apparent. If we only need to communicate between specific networks or specific devices with fixed IP addresses, a firewall is a fine solution.
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source. Most filters can easily be designed with a return loss of 10 dB or higher. With this value of return loss, only one-tenth the power incident to the filter s input will not be passed on to the load, but will be reflected back toward the original source. Ripple The amount of amplitude variations in the passband of a filter. Excessive ripple causes high BER in digital systems. Measured in dB. Ripple loss The distinction between the maximum and the minimum attenuation inside the filter s passband. Shape factor Specifies the steepness of the skirts in a filter, and is measured as: BW (at 60 dB) BW (at 3 dB) A perfectly square shape factor would equal 1. Measured as a ratio. Spurious responses Since the perfect component does not exist, any filter made of capacitors, inductors, and/or crystals can have areas within its stopband that supply less attenuation than planned, or create ripple within the filter s passband. This is caused by undesired reactances from the component s own leads, as well as stray inductances and capacitances, resonating at various frequencies. Crystal filters, especially those with the AT-cut, will have these responses at roughly odd integer multiples of the fundamental frequency, which can create unexpected consequences in the design of the communication system if not expected. Distributed microwave filters can also have reentrance modes, which can allow a multitude of secondary passbands within the filter s expected stopband. These effects can, if required, be ameliorated by supplemental LC filtering at the output of the crystal filter and in some of the lower-frequency distributed filters. Stopband (reject band) The band of frequencies that bandpass, low-pass, high-pass, and bandstop filters attenuate to some predetermined level, usually 60 dB (but it can be much less). The stopband is the point on the attenuated side of the cutoff frequency. Measured in Hz. 6.1 Lumped Filters
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Related Properties
Band preamp Narrow band amplets (optional) Loss fixed per stage count C/L-band splitter C/L-band splitter Trunk Loss increases with channel count
G-14
Here, the result of the test for less than is false. However, somewhat counterintuitively, so is the inverse comparison:
American Society for Testing and Materials (ASTM)
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