<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="Author" content="John Kostogiannis"> <meta name="GENERATOR" content="Mozilla/4.7 [en] (Win98; I) [Netscape]"> <title>vpb4 specifications</title> </head> <body> <center><b><font size=+3>VPB4 Technical Specifications</font></b></center> <p><b>Number of ports: </b>4 ports per card <p><b>Network Interface:</b> Loop-Start <p><b>Processor:</b> TMS320C52 <p><b>System requirements: </b> PC IBM Compatible <p><b>Operating Systems:</b> Linux/Windows NT <p><b>Host Interface</b> <blockquote><b>Bus: </b> 16 bit ISA <br><b>Base Addresses: </b> 0x300-0x3f0</blockquote> <b>Telephone interfaces</b> <blockquote><b>Trunk Type:</b> Loop-Start <br><b>Impedance:</b> 600 Ohms <br><b>Ring Detection:</b> 50V AC RMS super-imposed <br> on 48V DC for cadences having <br> an on period of 200ms and <br> frequencies 14.5Hz-55Hz. <br><b>Loop Current:</b> 20mA <br><b>Cross-Talk coupling: </b> <-60dB <br><b>Connector:</b> RJ-11 Type</blockquote> <b>Power Requirement</b> <blockquote><b>+5V,-5V: </b> 450mA, 50mA</blockquote> <b>Operating temperature: </b> 0 to 50C <p><b>Form factor: </b> Full length ISA <p><b>Cards per system:</b> Application dependent <p><b>Audio compression rates: </b>32kbit/s OKI-ADPCM <br> 64kbit/s A-Law, Mu-Law <br> 128kbit/s Linear <p><b>Sampling device: </b>8-bit ADC-DAC @ sampling at 8kHz <br><b>Frequency response:</b> 300-3400Hz <br><b>Receive range: </b> -28dB to +6dB (optional AGC) <br><b>Transmit/Receive range: </b> Programmable -12dB to 12dB <p><b>Cut-thru DTMF detection: </b>0-9,*,#,A,B,C,D <p><b>EMI/Telecom Approvals:</b> Australia seeking international <p><b>Warranty:</b> Replacement <br> <br> <br> <br> </body> </html>