Comtech EF Data CDM-760 - Manual (Page 122)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–36
On the top line, the letter ‘X’ in PIICX represents the slot number (PIIC1 or PIIC2) containing the
optional interface. Use the   arrow keys to select a parameter. Press ENTER.
(CONFIG: INTF) (PIICX=OC3/STM1)  Type
Use the  arrow keys to select NONE or OC3/STM1. Press ENTER.
You can access these menus only when the standard PIIC slots card is installed and
the modem senses the presence of an optional PIIC module.
In Single Stream Mode, an OC3/STM1 PIIC interface with a setting of OC3/STM1 fixes the
modem data rate to the correct speed. The symbol rate is linked to this fixed data rate, so that it
adjusts automatically when changes occur to the modulation, coding, pilots, or Tx frame block
size.
The activated symbol rate or CnC FAST Option must be compatible with the symbol
or data rate for the selected interface.
(CONFIG: INTF) (PIICX=OC3/STM1)  ClkSource
ClkSource: TXClock: TX CLK
RXClock: RX SAT ()
Use the   arrow keys to select a parameter. Press ENTER.
(CONFIG: INTF) (PIICX=OC3/STM1)  ClkSource  TXClock
Lock the Tx symbol rate of the modulator to the applicable clock source. Use the 
arrow keys to select RX SAT or TX CLK. Press ENTER.
Comtech EF Data strongly suggests that you select TX CLK, 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=OC3/STM1)  ClkSource  RXClock
Set the clock source by which Rx data is clocked out of the OC3/STM1 interface to the
external baseband equipment. Use the  arrow keys to select RX SAT or TX CLK.
Press ENTER.
Comtech EF Data strongly suggests that you select RX SAT, unless a high-
stability EXT CLK is present and timing of the network requires all devices
to be locked to the EXT CLK.