1、Features

1.1 Advantages:

     a)Abundant interface varieties, convenient for the reception of multiplex service;
     b)Voice interface with caller ID and counter-pole signal;
     c)Optional optical transmission interface, connect directly to optical fiber;
     d)Perfect status display function, easy to maintain;
     e)Small bulk, attractive appearance, convenient for installation and operation.

1.2 Environmental requirement
     operating temperature：              0℃～40℃
     relative humidity：                   ≤90%（25℃）

1.3 power supply
     input voltage：               -48V (-36V～-72V)
     input current：                          ＜1A   

Application examples:

2、Technical index

2.1 2Mb/s interface
    Standard E1 interface in conformity with ITU-T G.703, G.704, G.712
    a)Bit rate：                 2048Kbps±50ppm 
    b)code pattern：                 HDB3 
    c)interface impedance：          75Ω   

2.2 User and loop interface
    a)impedance：                       200Ω+680Ω||0.1μF
    b)insertion loss：                  -3±0.75dB  
    c)frequency characteristic：        300～3400Hz(-0.6～+3dB) 
    d)cacophony：                       ≤63.7dBmop  cacophony
    e)crosstalk attenuation：           ≥65dB  
    f)loop impedance：                  ≤1800Ω

2.3 Two/Four line  acoustic frequency interface
    a)impedance：                             600Ω
    b)Four line AD gain：                     14dB（factory adjustable）
    c)Four line DA gain：                     -2 dB（factory adjustable）
    d)Four line AD frequency characteristic： -0.2 - +0.2dB
    e)Four line DA frequency characteristic： -0.2 - +0.2dB
    f)Two line AD frequency characteristic：  -0.2 - +0.2dB
    g)Two line DA frequency characteristic：  -0.2 - +0.2dB（factory adjustable）
    h)Return loss：                           40dB
    i)degree of balance：                     70dB
    j)Common mode rejection ratio：    70dB
    k)power rejection ratio：                 30dB
    m)vacant channel noise：                  ≥65dB

2.4 Two/Four line E&M interface
    a)impedance：                              600Ω
    b)Four line AD gain：                      14dB（factory adjustable）
    c)Four line DA gain：                      -2 dB（factory adjustable）
    d)Four line AD frequency characteristic：  -0.2 - +0.2dB
    e)Four line DA frequency characteristic：  -0.2 - +0.2dB
    f)Two line AD frequency characteristic：   -0.2 - +0.2dB
    g)Two line DA frequency characteristic：   -0.2 - +0.2dB（factory adjustable）
    h)Return loss：                            40dB
    i)degree of balance：                      70dB
    j)Communication mode rejection ratio：     70dB
    k)power rejection ratio：                  30dB
    m)vacant channel noise：                   ≥65dB

2.5 V.24 interface 
    a)interface type：           V.24 asynchronous
    b)speed：                      0 - 19.2Kbps

2.6 V.35 interface
    a)interface type：            V.35 synchronous
    b)speed：                    Nx64Kb/s（N =1-15）
    c)timing mode：                    DCE

2.7 10Base_T interface
    a)interface type：               10Base-T
    b)transmission speed：       Nx64Kb/s（N = 1-15）
    c)protocol：                 link layer bridging

3、Outline dimension
    adopt 19-inch standard casing.
    Dimension:260mm×480mm×44mm (L×W×H)