DSU III AR Interface Pinouts

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    Article ID: 1600
    Q&A

     

     

      DSU III AR Interface Pinouts


     

    Q:

    DSU III AR Interface Pinouts

     

     

    A:

    The following charts give the pin assignments for the III AR interfaces. They can also be found in the DSU III AR User Manual.

    Pin Assignments for Telco Connector

    The DSU III AR has an eight-position modular jack labeled TELCO. The connector is used for connecting to the network when the unit is configured for either dedicated or switched operation.

    PinNameDescription
    1R1Transmit Data from DSU to Network-Ring 1
    2T1Transmit Data from DSU to Network-Tip 1
    3-6-Not Used
    7TReceive Data from Network to DSU-Tip
    8RReceive Data from Network to DSU-Ring

     

     

    DTE DATA CONNECTION/PRIMARY DTE

    The primary DTE should be connected to either the EIA-232 DTE connector or the CCITT V.35 DTE connector. The maximum cable lengths recommended are 50 feet for the EIA-232, and 100 feet for the CCITT V.35.

     

    The V.35 connector is recommended for use with data rates above 19.2 kbps. The EIA-232 connector works up to 56 kbps with a low capacitance cable or with the external transmit clock option selected. The primary DTE rate is configured from the front panel. The primary DTE can operate in asynchronous or synchronous modes.

     

    To prevent possible radio frequency interference emissions, a shielded cable is required.

     

     

    Pin Assignments for Primary EIA-232 Connector

     

    PinEIADescription
    1AAProtective Ground (PG)
    2BATransmit Data (TD)
    3BBReceive Data (RD)
    4CARequest to Send (RS)
    5CBClear to Send (CS)
    6CCData Set Ready (SR)
    7ABSignal Ground (SG)
    8CFReceived Line Signal Detector (CD)
    9-+12 Test Point
    10--12 Test Point
    15DBTransmit Clock (TC)
    17DDReceive Clock (SCR)
    18-Local Loopback (LL)
    20CDData Terminal Ready (TR)
    21-Remote Loopback (RL)
    22CERing Indicator (RI)
    24DAExternal Tx Clock (ETC)
    25-Test Indicator (TI)

     

    Pin Assignments for Primary V.35 Connector

    PinEIADescription
    A101Protective Ground (PG)
    B102Signal Ground (SG)
    C105Request to Send (RS)
    D106Clear to Send (CS)
    E107Data Set Ready (SR)
    F109Received Line Signal Detector (CD)
    H-Data Terminal Ready (TR)
    J-Ring Indicate (RI)
    L-Local Loopback (LL)
    N-Remote Loopback (RL)
    R104Receive Data (RD-A)
    T104Receive Data (RD-B)
    V115Receiver Signal Element Timing (SCR-A)
    X115Receiver Signal Element Timing (SCR-B)
    P103Transmitted Data (SD-A)
    S103Transmitted Data (SD-B)
    Y114Transmitter Signal Element Timing (SCT-A)
    AA114Transmitter Signal Element Timing (SCT-B)
    U113External TX Signal Element (SCX-A)
    W113External TX Signal Element (SCX-B)
    NN-Test Indicator (TI)

     

     

    SECONDARY CHANNEL CONNECTION

    If used, the secondary DTE should be connected to the auxiliary EIA-232 connector.

    Pin Assignments for Auxiliary EIA-232 Connector

    PinEIADescription
    1AAProtective Ground (PG)
    2BATransmit Data (TD)
    3BBReceive Data (RD)
    4CARequest to Send (RS)
    5CBClear to Send (CS)
    6CCData Set Ready (SR)
    7ABSignal Ground (SG)
    8CFReceived Line Signal Detector (CD)