◆ Provide one line with the rate of 10/100M Ethernet interface(JMP).
◆ provide 3-23 E1 interface.
◆ Provide the channel with 1-30 telephone interface (available on the business needs of    different users different ones matching the telephone interface).
◆ Speech Interface support CND and anti-Signals.
◆ On small size, looks beautiful, easy installation and operation.
◆ On improving the status display, easy maintenance and management.
◆ On adapt to a variety of environmental -48VDC or 220VAC power supply.

　E1Optical Interface
    a) Bit rate：155.52Mbps±20ppm
    b) Code pattern : NRZ+ Scramble
    c) transmission optical power：> -5dB ～      -17dB
    d) Receiver sensitivity：> -36dB

　 E1 Interface
    Nominal E1 Interface，Conform to ITU-T    G.703、G.704 suggestion
     a) Bit rate：2048Kbps±50ppm
     b) Code pattern ：HDB3
     c) Interface impedance ：75Ω
     d) Interface Characteristics： Conform to        G.703、G.742and G.823 standard
     e) Frame Structure ：no frame structure
　 External dimensions
     Standard 19-inch 1U       structure:438×215×45mm

　 Power supply
　 　220V or -48V

　E1OpticalUser and interface loop
 　Speech Interface : speech  characteristics with the<<Ministry of  Posts and total telephone exchange  switch equipment Technology Standards>>
     a) Impedance：600Ω
     b) Insertion loss：-3±0.75dB
     c) Frequency：300～3400Hz(-0.6～+3dB)
     d) Noise：≤63.7dBmop
     e) crosstalk attenuation：≥65dB
     f) Subscriber Line loop resistance of       less than 3K Ω (walkie-talkie)
    g) Feed voltage：48V；
    h) Feed current：20~50mA；
    i)  15V ringing： plus or minus 15V        AC90

　E1OpticalEthernet Interface
　   a) Interface：10/100Base-Tx；
　   b) Interface specification： conform       to IEEE-802.3u standard
　   c) Interface rate: 10/100M
      self-adapting
　   d) Interface connector ：RJ-45.