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Introduction to Cable Television - CATV Book
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Digital Subscriber Line - DSLA digital subscriber line transmits digital information, usually on a copper wire pair. Although the transmitted information is in digital form, the transmission medium is usually an analog carrier signal (or the combination of many analog carrier signals) that is modulated by the digital information signal.
Digital Subscriber Line (DSL) System
This figure shows a simplified ADSL communication system that consists of a digital subscriber line access multiplexer (DSLAM), local distribution lines that start from a main distribution frame (MDF) wire cabinet that brings the connection to the digital subscriber line (DSL) modem at the customer's location. Modems in the DSLAM convert the digital signals from the Internet to high frequency signals that travel down the telephone line to the DSL modem. The DSL modem converts the RF signals back to its original digital form so it can be provided to the customer's computer. Most DSL technologies (such as ADSL shown in this example) transmit the data information on frequencies above the audio channel. This allows for the simultaneous transmission of analog and data signals on the same telephone line. The highest frequencies are used transmission from the DSLAM to the DSL modem and frequencies just above the audio band are used to transmit from the data from the customer to the DSLAM. Typical DSL technology allows up to 6 Mbps to be transmitted to the customer and up to 640 kbps can be received from the customer.
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Introduction to Cable Television - CATV Book
This book provides an overview of cable television system technology including cable modems, digital television, HDTV, along with how cable systems are converting from analog systems to digital networks so they can offer advanced services such as ultra broadband, video on demand (VOD) and addressable advertising. $19.99 Printed, $16.99 eBook |
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