Comtech EF Data CDM-750 Installation And Operation Manual page 87

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation
slaved to this fixed data rate and will change when modulation, coding, pilots or Tx frame block
size is changed. Selection of these interfaces may not be possible if the symbol rate license or
CnC license will not support the symbol rate or data rate.
(CONFIG: INTF) PIICX (G.703)
Clock Source: ExtClock TxClock
Use the arrow keys to select ExtClock, TxClock, or RxClock, and then press ENTER. The
bottom line displays the current setting for each parameter.
(CONFIG: INTF) PIICX (G.703)
ExtClock: 1 MHz
To set the expected clock rate for the external clock source located on the J8 | Ext Ref BNC
connector: Use the
MHz (E3), 44.736 MHz (T3), or 51.840 MHz (STS1), and then press ENTER.
(CONFIG: INTF) PIICX (G.703)
Tx Clock Source: TX CLK
To lock the Tx symbol rate of the modulator to the appropriate clock source: Use the
keys to select EXT CLK, RX SAT, or TX CLK, and then press ENTER.
Comtech EF Data strongly suggests 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.
(CONFIG: INTF) PIICX (G.703)
Rx Clock Source: RX CLK
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
EXT CLK, and then press ENTER.
Comtech EF Data strongly suggests that RX 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
1 MHz TXC
ClkSource
arrow keys to select 1 MHz, 2 MHz, 5 MHz, 10 MHz, 20 MHz, 34.368
ClkSource
ClkSource
arrow keys to select RX SAT, INT CLK, TX CLK, or
5–11
RxClock
RXS ( )
ExtClock
( )
TxClock
( )
RxClock
( )
Revision 2
MN-CDM750
arrow