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TNETEL1200PPB Datasheet(PDF) 2 Page - Texas Instruments |
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TNETEL1200PPB Datasheet(HTML) 2 Page - Texas Instruments |
2 / 20 page TNETEL1200 EtherLoop ™ MODEM SPHS003D – FEBRUARY 1999 – REVISED JUNE 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description The TNETEL1200 is an EtherLoop modem. EtherLoop technology enables simultaneous voice and Ethernet communication over local-loop plain old telephone service (POTS) wiring. The TNETEL1200 supports data rates of up to 6 Mbit/s and POTS wire lengths of up to 21,000 feet. Figure 1 shows a typical system with an EtherLoop modem located at each end of the POTS line. Each EtherLoop modem has a 10Base-T Ethernet interface and is responsible for buffering Ethernet data before sending it over the POTS wire. The server-end (SE) EtherLoop modem is located in a central switching office and can communicate with several client-end (CE) EtherLoop modems, based on a round-robin arbitration scheme. The CE EtherLoop modem typically is located at a remote site. POTS Line POTS Line SE Modem Ethernet Network Central Office CE Modem CE Modem Remote Location Ethernet Network Ethernet Network ¤ ¤ See Note A NOTE A: Flexible multiplexing scheme allows one SE modem to interface with many CE modems. POTS Phone POTS Phone Remote Location Figure 1. Typical EtherLoop System Figure 2 shows a block diagram of a typical CE EtherLoop modem. Ethernet data destined for the POTS wire is received via 10Base-T interface and presented to the EtherLoop processor. The EtherLoop processor performs Ethernet frame processing and buffer management. The EtherLoop processor sends buffered Ethernet frames to the TNETEL1200 EtherLoop modem (via an HDLC interface). The TNETEL1200 performs data modulation before passing the modulated digital data to a digital-to-analog converter (DAC). The resulting analog signal passes to the EtherLoop transceiver, which acts as the line interface. The modem uses a half-duplex communication protocol over the POTS wire, and data received from the POTS wire follows the reverse path back to the Ethernet framer. Ethernet Network Ethernet Interface POTS Line EtherLoop Processor TNETEL1200 EtherLoop Modem DAC ADC POTS Phone EtherLoop Transceiver SRAM Voice Band Filter ¤ Figure 2. Typical CE EtherLoop Modem |
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