__________________________________________ Appendix A OEM Receivers Electrical Specifications
AsteRx2 Product Family Hardware Manual v2.10.1
38
A.3
Frequency Reference Selection
The receiver can get its 10-MHz frequency reference from its internal TCXO, or from an external
reference source. The involved pins are pins#39, #43 and #55. The diagrams below show the
recommended connections for both cases.
The internal TCXO is turned off when using an external 10-MHz reference, and the output at pin#39 is
disabled.
Internal frequency reference
External frequency reference
A.4
Ethernet (only for AsteRx2eL_OEM and AsteRx2eH_OEM)
There is no isolation transformer on the OEM board.
The applicable turns ratio are 1:2.5 for the transmit lines and 1:1 for the receive lines.
An exemplary 10Baset-T application circuit with isolation transformer is shown below. The four lines
at the left are connected to the pins#73, #75, #77 and #79 of the 80-pin connector. The four lines at
the right can be connected to a RJ-45 plug.
A.5
Stand-By Mode
In stand-by mode, the receiver consumes a fraction of its nominal power.
There are two ways to request the receiver to enter stand-by mode:
1.
by using the command “
exePowerMode
” (see Command Line Interface Reference Guide);
RJ45_TX-
RJ45_RX-
TCXO
OEM Rx
Pin#39
Pin#43
Pin#55
From external 10-MHz
reference
TCXO
(turned off)
OEM Rx
Pin#39
Pin#43
Pin#55
