4.4.1. Setting the Clock Source for H.100 and H.110 Mode Systems

Perform the procedure described below to change the default clock settings for H.100 and H.110 mode systems:

1. To access the clocking settings in DCM, double-click Bus-0 under the TDM Bus in the DCM tree structure of configured devices (see Figure 8, DCM Main Window). This displays the TDM Bus Configuration property sheet for Bus-0 (Figure 12).

Figure 12. TDM Bus Configuration Property Sheet

2. Ensure that the TDM Bus Type (Resolved) parameter is set to the proper bus mode for your system: H.100 or H.110. If the current setting is incorrect, change the TDM bus type by highlighting the TDM Bus Type (User Defined) parameter and selecting the appropriate value from the Value list. Then, click the Apply button.
3. Highlight the Primary Master FRU (User Defined) parameter.
4. From the Value list, select the board you would like to make the Primary Master.
5. Click the Apply button.

   If you are using the primary master board's internal oscillator or front-end network interface (Springware boards only) as the clocking source, continue with step 11. If the primary master board is deriving system clocking from a digital network trunk connected to a Network Reference (NETREF) board, continue with step 6.

6. In the TDM Bus Configuration property sheet, highlight the NETREF One FRU (User Defined) parameter.
7. In the Value field, type the name of the board that contains the network interface that will provide a network reference clock to the system. This should be the same name as displayed in the DCM Main Window.
8. Click the Apply button.
9. Specify the source of the network reference clock (specifically, the trunk on the board containing the digital network interface providing the NETREF clock) via the Derive NETREF One From (User Defined) parameter.
10. Click the Apply button.
11. Highlight the Derive Primary Clock From (User Defined) parameter. Select the appropriate option from the Value list:
    • Internal Oscillator: the primary master derives clocking from its own internal circuitry.
    • FrontEnd_1: the primary master derives clocking from its own front end network interface (span 1 of a DualSpan board).

      Note: The FrontEnd_1 value is only valid when the Primary Master FRU is a Springware board. This value cannot be used when the Primary Master FRU is a DM3 board.

    • FrontEnd_2: the primary master derives clocking from its own front end network interface (span 2 of a DualSpan board).

      Note: The FrontEnd_2 value is only valid when the Primary Master FRU is a Springware board. This value cannot be used when the Primary Master FRU is a DM3 board.

    • NETREF_1: the primary master derives clocking from CT Bus NETREF_1 line.

    Note: The NETREF_2 drop-down list option is not supported by the current Intel Dialogic System Software release.

12. Click the OK button. This will apply the Derive Primary Clock From (User Defined) parameter modification and return to the DCM main window.

To designate a board as the secondary clock master, carry out the same procedure as above, but select the name of the board in the Value list of Secondary Master FRU (User Defined) parameter instead of Primary Master FRU (User Defined) parameter and set the Derive Secondary Clock From (User Defined) parameter instead of Derive Primary Clock From (User Defined) parameter.

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