Comtech EF Data CDM-750, Инструкция по установке и эксплуатации

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CDM-750 Advanced High-Speed Trunking Modem Revision 2
Ethernet-based Remote Product Management MN-CDM750
6–29
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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.
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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 .
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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
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Interface Type – Use the drop ‐ down list to select None or OC3 .
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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.
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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.
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Rx Buffer Size (ms) – Enter a buffer size, in 0.5 ms steps, ranging from 2 ms to 75 ms.
Alarm Settings
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Tx Symbol Clock PLL – Use the drop ‐ down list to select Alarm , Fault , Mask , or Fault (Tx On) .
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Input Signal Loss – Use the drop ‐ down list to select Alarm , Fault , Mask , or Fault (Tx On) .
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Rx Buffer Clock PLL – Use the drop ‐ down list to select Alarm , Fault , or Mask .
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Rx Buffer Overflow / Underflow – Use the drop ‐ down list to select Alarm , Fault , or Mask .
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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) .
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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) .