Front Panel Operation Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–36
• If the Fill Status is decreasing (approaching 0%), then the Rx traffic is arriving too slowly for the
Rx Clock setting, causing a data underflow.
• If the Fill Status is increasing (approaching 100%), then the Rx traffic is arriving too quickly for
the Rx Clock setting, causing a data overflow.
If this value indicates a data underflow or overflow, then use the arrow keys to select Yes
to re-center the Rx Buffer depth to 50%.
6.2.2.4.4.2 (CONFIG:) INTF (PIICX=OC3/STM1)
You can access this menu only when a PIIC OC3/STM1 module is installed in a PIIC slot.
PIICX: Type:OC3/STM1 ClkSource Mask
BufSize:32.0ms Center:No Fill=50% ()
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.
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