Configuration Interface - Comtech EF Data SDM-9000 Installation And Operation Manual

SDM-9000 Satellite Modem

4.2.1.3 Configuration Interface

TX CLOCK PHASE
EXT-REF FREQ
BUFFER CLOCK
Rev. 4
Programs the TX clock phase to:
• Normal
• Invert
On entry, the current setting for the TX clock phase is displayed.
Press [↑] or [↓] to select Normal or Invert. Press [ENTER] to
execute the change.
Note: This menu is only available for the ECL, PECL, or
MIL-STD-188 interface.
Programs the external reference clock input frequency between
1544.000 and 51840.000 kHz, in steps of 8 kHz, or at data rate (if
data rate is over 20000.0 kbit/s).
On entry, the current setting for the external reference is displayed.
Press [↑] or [↓] to increment or decrement the digit at the flashing
cursor. Press [ENTER] to execute the change.
Programs the interface buffer output clock to one of the following
modes:
• RX Satellite
• Internal Clock
• External Clock
• TX Terrestrial
RX (Satellite) Mode:
Sets the buffer output clock to the satellite clock.
Internal Clock Mode:
Sets the buffer output clock to operate from the modem internal
clock. This is also the fallback clock.
External Clock Mode:
Sets the clock source to the external supplied buffer clock.
TX Terrestrial Mode:
Sets the buffer output clock to recover timing from the incoming TX
data clock.
On entry, the current setting of the buffer clock is displayed. Press
[←] or [→] to select Satellite, Internal, External Reference, or TX
Terrestrial for the buffer clock. Press [ENTER] to execute the
change.
Notes:
1. This menu is only available when the buffer is installed.
2. The buffer clock source selection must fall within the
parameters listed in Chapter 5.
Operation
4–15