By Jim Van Meggelen; Jared Smith; Leif Madsen
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The evolution of inexpensive, commodity-based telephony hardware is only slightly behind the telephony software revolution. New companies spring up on a weekly basis, each one bringing new and inexpensive standards-based devices into the market. ‡ FXS and FXO refer to the opposing ends of an analog circuit. Which one you need will be determined by what you want to connect to. Chapter 7 discusses these in more detail. § T1 and E1 are digital telephony circuits. We’ll discuss them further in Chapter 7.
The hardware you require will be determined by what it is you want to achieve. * Because of Asterisk’s open architecture (and open source code), it is ultimately possible to connect any standards-compliant # Often referred to as TDM networks, due to the Time Division Multiplexing used to carry traffic through the PSTN. Telephony Hardware | 25 interface hardware. org). Analog interface cards Unless you need a lot of channels (or a have lot of money to spend each month on telecommunications facilities), chances are that your PSTN interface will consist of one or more analog circuits, each of which will require a Foreign eXchange Office (FXO) port.
Generally speaking, the more compression that’s required, the more work the DSP must do to code or decode the signal. Uncompressed codecs, therefore, put far less strain on the CPU (but require more network bandwidth). Codec selection must strike a balance between bandwidth and processor usage. Central processing unit (and Floating Point Unit) A CPU is comprised of several components, one of which is the floating point unit (FPU). The speed of the CPU, coupled with the efficiency of its FPU, will play a significant role in the number of concurrent connections a system can effectively support.
Asterisk by Jim Van Meggelen; Jared Smith; Leif Madsen