Dmd2050 Clocking Options; Clock Selection - Radyne DMD2050 Operation Manual

Theory of Operation

3.6 DMD2050 Clocking Options

The following paragraphs define the types of clocking options available to the user at the Front
Panel of the DMD2050. Refer to Figure 3.9 for clocking and polarity.

3.6.1 Clock Selection

As shown in Figure 3-9, both the Tx Clock and the Buffer Clock source may be independently
locked. Clock sources may be:
SCT (Internal Oscillator)
SCTE (External Tx Terrestrial Clock)
EXT BNC (External Clock Source)
Rx Satellite Clock (Loop Timing)
EXT IDI (Drop and Insert Clock)
For loop timing applications the SCT Clock Source can be selected to be Rx Satellite Clock.
J19
SD
TT
ST
HIGH STABILITY
High Stability
Oscillator
EXTERNAL
J10
EXT REF
TRANSMIT
RECEIVE
J16
EXT CLK
J8
IDI
CLOCK
RECOVERY
NORMAL
INVERTED
J19
RT
BUFFER CLK
BUFFER CLK POL
RD
DATA POLARITY
INVERT NONE
INV. TERR&BASE
INV. BASEBAND
INV. TERR DATA
3-10
DMD2050 CLOCKING AND POLARITY
INVERT NONE
INV. TERR&BASE
INV. BASEBAND
INV. TERR DATA
SCTE
Tx CLK
SRC
SCT
INTERNAL
REF FREQ
SRC
SCT CLK
SRC
SCR
EXT IDI
EXT BNC
SCT
SRC
SCTE
RX SAT
Figure 3-9. Clocking and Polarity Diagram
DMD2050 Universal Satellite Modem
DATA POLARITY
CLOCK &
MODULATION
DATA
CLK POL
NORMAL
INVERTED
AUTO
CLOCK & DATA
DEMODULATION
RECOVERY
TM110 - Rev. 1.3