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    參數(shù)資料
    型號: PEF24901
    英文描述: ISDN LINE INTERFACE|BASIC|CMOS|QFP|64PIN|PLASTIC
    中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)線接口|基本|的CMOS | QFP封裝| 64管腳|塑料
    文件頁數(shù): 35/73頁
    文件大小: 1618K
    代理商: PEF24901
    PEB 2466
    PEF 2466
    Operational Description
    Hardware Reference Manual
    26
    2001-02-20
    4.2.18
    Transhybrid Loss
    The quality of Transhybrid-Balancing is very sensitive to deviations in gain, group delay,
    and deviations inherent to the A/D- and D/A-converters, as well as to all external
    components used on a linecard (SLIC, OP
    s etc.).
    Transhybrid loss test setup:
    The SICOFI
    4-μC test loop
    DLB-ANA
    is selected (see
    Figure 34
    ), which connects the
    analog output with the analog input. The programmable filters FRR, AR, FRX, AX are
    by-passed. The IM-filter is disabled, (H(IM)=0). The balancing filter TH is enabled with
    optimized coefficients for this configuration (
    V
    OUT
    =
    V
    IN
    ).
    A 0 dBm0 sine wave signal with a frequency in the range of 300 Hz to 3400 Hz is applied
    to the digital input. The signal levels of the resulting echo at the digital output will stay
    below the values shown in
    Table 20
    .
    Table 20
    Transhybrid Loss
    Input Frequency
    Symbol
    Transhybrid Loss
    min.
    27
    30
    29
    27
    27
    Unit
    Test Condition
    typ.
    40
    45
    40
    35
    35
    300 Hz
    500 Hz
    2500 Hz
    3000 Hz
    3400 Hz
    THL
    300
    THL
    500
    THL
    2500
    THL
    3000
    THL
    3400
    dB
    dB
    dB
    dB
    dB
    T
    A
    = 25
    °
    C;
    V
    DD
    = 5 V
    AGX = AGR = 0 dB;
    typical variation of
    amplitude:
    ±
    0.15 dB
    delay:
    ±
    0.5
    μ
    s.
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