Comtech EF Data CDM-750 Installation And Operation Manual page 62

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation
(CONFIG: INTF) PIICX
To set the expected clock rate for the external clock source located on the J8 | Ext Ref
BNC connector: Use the ▲ ▼ arrow keys to select 1 MHz, 2 MHz, 5 MHz, 10 MHz, 20
MHz, 34.368 MHz (E3), 44.736 MHz (T3), or 51.840 MHz (STS1), and then press
ENTER.
(CONFIG: INTF) PIICX
To lock the Tx symbol rate of the modulator to the appropriate clock source: Use the ▲
▼ arrow keys to select EXT CLK, RX SAT, or TX CLK, and then press ENTER.
IMPORTANT
(CONFIG: INTF) PIICX
To set the clock source by which Rx data will be clocked out of the G.703 interface to the
external baseband equipment: Use the ▲ ▼ arrow keys to select RX SAT, INT CLK,
TX CLK, or EXT CLK, and then press ENTER.
IMPORTANT
(CONFIG: INTF) PIICX
Rx Buffer: BufferSize
Use the ◄ ► arrow keys to select BufferSize or ReCenter, and then press ENTER. The lower line
displays the present RxBuffer Fill Status as a percentage.
(CONFIG: INTF) PIICX
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.
ClkSource
ExtClock: 1 MHz
ClkSource
Tx Clock Source: TX CLK
It is strongly suggested that TX CLK is selected here unless a high
stability EXT CLK is present and timing of the network requires all
devices to be locked to the EXT CLK.
ClkSource
Rx Clock Source: RX CLK
It is strongly suggested that RX SAT is selected here unless a high
stability EXT CLK is present and timing of the network requires all
devices to be locked to the EXT CLK.
RxBuffer
Fill Status = 00%
RxBuffer
Rx Buffer Size: 02.0 ms
ExtClock
TxClock
RxClock
ReCenter
(
BufferSize
5–8
Revision 1
MN-CDM750
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