Comtech EF Data CDM-750 Installation And Operation Manual page 91

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation
(CONFIG: INTF) PIICX (OC3)
Rx Clock Source: RX CLK
To set the clock source by which Rx data is clocked out of the OC3/STM‐1 interface to the
external baseband equipment: Use the
then press ENTER.
(CONFIG: INTF) PIICX (OC3)
Rx Buffer: BufferSize
Use the arrow keys to select BufferSize or ReCenter, and then press ENTER.
The bottom line displays the present RxBuffer Fill Status as a percentage. If the RxBuffer Fill Status
is dropping (approaching 0%), this indicates that the Rx traffic is not keeping up with the Rx Clock
setting and a data underflow is occurring. If the RxBuffer Fill Status is increasing (approaching
100%) the Rx traffic is coming in faster than the Rx Clock setting accommodates, and a data
overflow is occurring.
(CONFIG: INTF) PIICX (OC3)
Rx Buffer Size: 02.0 ms
Use the arrow keys to increment/decrement the Rx Buffer Size time value (from 2 ms to 75
ms in 0.5 ms steps), and then press ENTER.
(CONFIG: INTF) PIICX (OC3)
Rx Buffer: ReCenter
In the event of data underflow or overflow (as indicated by the Fill Status percentage reported
on the RxBuffer menu) press ENTER to ReCenter the Rx Buffer depth to 50%.
(CONFIG: INTF) PIICX (OC3)
Masks: TxPll
To define how many or how few of the interface alarm or fault states are reported: Use the
arrow keys to select TxPll, InpSigLoss, RxPll, RxOF, or RxUF, and then press ENTER. Note the
following:
ClkSource
RxBuffer
Fill Status = 00%
RxBuffer
RxBuffer
Mask
InpSigLoss
RxPll RxOF
RxClock
(
arrow keys to select RX SAT, INT CLK, or TX CLK, and
ReCenter
(
BufferSize
(
Recenter
(
RxUF
5–15
Revision 2
MN-CDM750
)
)
)
)