Comtech EF Data CDM-760 - Manual (Page 119)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–33
PIICX: Type:STS1 ClkSource Mask
BufSize:32.0mS Center:No Fill:99% ()
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=G703)  Type
Use the  arrow keys to select NONE, T3, E3 or STS1. Press ENTER.
In Single Stream Mode, a G.703 PIIC interface with a setting of T3, E3 or STS1 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=G703)  ClkSource
ClkSource: ExtClock:1 MHz
TxClock:TX CLK RxClock:RX SAT ()
Use the   arrow keys to select a parameter. Press ENTER.
(CONFIG: INTF) (PIICX=G703)  ClkSource  ExtClock
Set the expected clock rate for the external clock source 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). Press ENTER.
(CONFIG: INTF) (PIICX=G703)  ClkSource  TxClock
Lock the Tx symbol rate of the modulator to the applicable clock source. Use the 
arrow keys to select EXT CLK, 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=G703)  ClkSource  RxClock
Set the clock source by which Rx data is 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. 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.