Comtech EF Data CDM-750 - Manual (Page 173)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Ethernet-based Remote Product Management MN-CDM750
6–29
• Rx Clock Source – Use the drop‐down list to select Tx Clock, Ext Clock, Rx Sat, or Int Clock.
Comtech EF Data strongly recommends that you select Rx Sat unless a high
stability External Clock is present and timing of the network requires all
devices to be locked to the External Clock.
• External Clock – Use the drop‐down list to set the expected clock rate for the External Clock
source (via the CDM‐750 rear panel J8 | EXT REF connector) as 1 MHz, 2 MHz, 5 MHz, 10
MHz, 20 MHz, 34.368 MHz, 44.736 MHz, or 51.85 MHz.
• Rx Buffer Size (ms) – Enter a buffer size, in 0.5 ms steps, ranging from 2 ms to 75 ms.
Click [Configure PIIC] to save these settings.
OC3 Configuration
• Interface Type – Use the drop‐down list to select None or OC3.
• Tx Clock Source – Use the drop‐down list to select Tx Clock or Rx Sat.
Comtech EF Data strongly recommends that you select Tx Clock unless a high
stability External Clock is present and timing of the network requires all
devices to be locked to the External Clock.
• Rx Clock Source – Use the drop‐down list to select Tx Clock, Int Clk, or Rx Sat.
Comtech EF Data strongly recommends that you select Rx Sat unless a high
stability External Clock is present and timing of the network requires all
devices to be locked to the External Clock.
• Rx Buffer Size (ms) – Enter a buffer size, in 0.5 ms steps, ranging from 2 ms to 75 ms.
Alarm Settings
• Tx Symbol Clock PLL – Use the drop‐down list to select Alarm, Fault, Mask, or Fault (Tx On).
• Input Signal Loss – Use the drop‐down list to select Alarm, Fault, Mask, or Fault (Tx On).
• Rx Buffer Clock PLL – Use the drop‐down list to select Alarm, Fault, or Mask.
• Rx Buffer Overflow / Underflow – Use the drop‐down list to select Alarm, Fault, or Mask.
• Ext Clock Activity (G.703 PIIC only) – (Indicates that the External Clock is selected by either
the TxClock or RxClock but no clock is present on J8 | EXT REF.) Use the drop‐down list to
select Alarm, Fault, Mask or Fault (Tx On).
• Ext Clock In Range (G.703 PIIC only) – (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.) Use the drop‐down list to select Alarm, Fault, Mask or Fault (Tx On).