By Jim Van Meggelen; Jared Smith; Leif Madsen
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Keep in mind, though, that a dual-server Asterisk solution will be more complex to design than a single-machine solution. • Consider using multiple processors, or processors with multiple cores. This will provide an improvement in the system’s ability to handle multiple tasks. For Asterisk, this will be of special benefit in the area of floating-point operations. • If you need a modem, install an external unit that connects to a serial port. If you must have an internal modem, you will need to ensure that it is not a so-called “Win-modem”—it must be a completely self-sufficient unit (note that these are very difficult, if not impossible, to find).
The purpose of the telephone is to capture these sounds and convert them into a format suitable for transmission over wires. In an analog telephone, the transmitted signal is analogous to the sound waves produced by the person speaking. If you could see the sound waves passing from the mouth to the microphone, they would be proportional to the electrical signal you could measure on the wire. Analog telephones are the only kind of phone that are commonly available in any retail electronics store.
Spend the money and get a top-notch power supply (gamers are pretty passionate about this sort of thing, so there are lots of choices out there). Redundant power supplies In a carrier-grade or high-availability environment, it is common to deploy servers that use a redundant power supply. Essentially, this involves two completely independent power supplies, either one of which is capable of meeting the power requirements of the system. If this is important to you, keep in mind that best practices suggest that to be properly redundant, these power supplies should be connected to completely independent uninterruptible power supplies (UPSes) that are in turn fed by totally separate electrical circuits.