4 E1 High-Density Digital Trunk Board

The 4E1 high-density digital trunk voice processing board can meet the requirements of high-performance and high-density services, such as the carrier-level telephone chatting, telephone conferencing, voice magazine, CRBT, BGM, and outsourced call center, which can provide the functions such as the voice, conference, signaling, and FSK/DTMF receiving/sending in large capacity and high stability for these services. Meanwhile, this board can help telecom device manufacturers integrate new computer platform and application requirements to deploy equipment-level application markets, for example, programmable switch, IP/PBX, media gateway, and signaling gateway. The board adopts the NADK SDK, which provides the API programming interface compatible with the Dialogic SR5.1.1. 

    l  Trunk interface and voice processing

     ? Provide 4 E1 digital trunk interfaces, which can process a maximum of 240 voice channels, with 240-channel CPS processing capability built in;

     ? A maximum of 8 boards could be inserted in one chassis, which provides a maximum of 32 E1 digital trunk interfaces and 960-channel voice processing capacity;

     ? Provide to receive/send the DTMF and FSK;

     ? Digital recording, compression, and voice playback;

     ? Identify the special signal tones such as the fax and modem;

     ? Support the NADK SDK, be compatible with all the Dialogic voice formats, and provide the API programming interfaces compatible with the SR5.1.1;

     ? The JCT board supports the continuous speech processing (CSP) function, voice interrupt, and echo cancellation;

     ? Support various sampling rates and voice compression formats;

    l  Signaling processing

     ? Support the Chinese SS1;

     ? Support the DSS1 (ISDN PRI).


    Computer Bus


    Telecom   Interface



    Enhanced   Function







    SS1, DSS1


    RIO2400, BNC-H2×8

    l  E1

     ? Frame structure: conform to the frame structure of G.704 and multiframe alignment of G.706;

     ? The 2048 kbps PCM confirms to the G.732 and G.796;

     ? The alarm conforms to the G.775;

     ? The jitter and wander conforms to the G.823;

    l  Voice encoding

     ? Sampling frequency: 6 k/8 k Hz;

     ? Data transmission rate: 64 kbps, 32 kbps, 24 kbps;

     ? Digital voice: A law/linear PCM, AMI ADPCM (.VOX);

    l  Computer bus: CPCI;

    l  Resource bus: Confirm to the CT-BUS H.110. 

    l  TICQ, multi-party communication

    l  Voice magazine, China Unicom voice service

    l  Voice value-added services such as the colour ring back tone (CRBT) and background music (BGM)

    l  Switch call centre with IVR function

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