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ADICTI  international  corporation 


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產品介紹

>>語音通訊卡
>>語音系統
>>網路電話
電話語音卡

ISDN PRI(30B+1D)
數位語音電話卡 LMI30LT

ISDN PRI(30B+1D)數位語音電話卡

技術規範

需求配備
  • BUS:PCI 32-bit Bus
  • PC:PentiumⅡ以上之相容電腦
連外介面
  • 電話接頭RJ-11,BNC接頭供選擇
硬體規範
  • 輸入電壓:+5V、+12V
多功能之數位信號處理器(DSP)模組
  • 支援G.723.1、G.729A、G.711、G.726等編碼演算法
  • G.723.1(including Annex A VAD/CNG) and Windows95 True Speech 8.5 compatibility.
  • Full/Half duplex voice and compression channels on real time.
  • Acoustic Echo Cancellation concurrent with True Speech and G.723.1 operation.
  • DTMF and Tone Generation.
  • DTMF and Programmable Tone Detection.
電話介面
  • Network clock rate
2.048 Mb/s ±50 ppm
  • Internal clock rate
  • 2.048 Mb/s ±32 ppm
  • Level


  • 2.37V (nominal) for 75 ohm or 3.0V (nominal) for 120 ohm lines
  • Pulse width
  • 244 ns (nominal)
  • Line impedance

  • 75 ohm, unbalanced or 120 ohm, balanced
    • Other electrical
       characteristics
    Complies with CCITT Rec. G.703
  • Framing
  • CCITT G.704-1988 with CRC4
  • Line coding
  • HDB3
  • Clock and data recovery

  • Complies with CCITT Rec. G.823-1988
  • Jitter tolerance


  • Complies with CCITT Rec. G.823, G.737, G.739, G.742-1988
  • Connectors

  • BNC for 75 ohm or RJ-11 for 120 ohm lines
  • Telephony bus connector

  • H.100-style 68-pin fine pitch card edge connector
  • Loopback


  • 應用程式函數庫支援擴充介面語音編碼、壓縮/解壓縮方式
    Supports switch selectable local analog loopback and software selectable local digital loopback

     

       
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