Comtech EF Data CDM-750 Installation And Operation Manual page 124

CDM-750 Advanced High-Speed Trunking Modem
Ethernet Management
•
External Clock Source: Use the drop-down menu to set the expected
clock rate for the external Clock source located on the J8 | EXT REF
connector provided on the CDM-750 rear panel as 1 MHz, 2 MHz, 5
MHz, 10 MHz, 20 MHz, 34.368 MHz, 44.736 MHz, or 51.85 MHz.
•
Rx Buffer Size: Enter a buffer size, in 0.5 ms steps, ranging from 2 ms to 75 ms.
•
Rx Buf Overflow / Underflow: Select the alarm state for the pertinent Rx Buffer Fill as
Alarm, Fault, Mask, or Alarm (Tx On).
•
Ext Clk Activity: (Indicates that the External Clock is selected by either the TxClock or
RxClock but no clock is present on J8 | EXT REF.) Select the alarm state for the
pertinent External Clock Activity as Alarm, Fault, Mask or Alarm (Tx On).
•
Ext Clk In Range: (Indicates that the External Clock is selected by either the TxClock or
RxClock, but the clock rate on J8 | EXT REF does not meet the expected rate by the
CDM-750.) Select the alarm state as Alarm, Fault, Mask or Alarm (Tx On).
For further details pertaining to any of the configuration parameters available on this page, refer
to Chapter 5. FRONT PANEL OPERATION. Once the desired configuration settings have
been made in each section, click [Config G.703] as needed in that section to save those changes.
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