Comtech EF Data MDX420 SkyWire Manual - Manual (Page 66)

MDX420 SkyWire™ Satellite Network Gateway SkyWire Controller (GUI)
MN-MDX420 Revision 6 7–10
Edit button (Figure 7.4.1.2) to make changes and once satisfied with the new settings, click on
the Apply button to have them take effect.
Repeat the above process for all installed burst demodulators.
Figure 7.4.1.2 Demodulator 1 Tab Edit Mode
 RX Enable: Rx Enable should be checked if you wish to demodulate and receive traffic from a
share group on this demodulator. Unchecking this box will disable the demodulator regardless of
any other settings.
 CRC Control: The gateway allows users to enable or disable CRC Control. When CRC Control is
checked, the gateway automatically performs Ethernet packet error checking on the receive
Satellite Link. When an Ethernet packet with a bad CRC is encountered, the packet is discarded
by the gateway.When CRC Control is unchecked, the gateway will remove the invalid CRC and
append a valid CRC to the Ethernet datagram and pass the packet to the LAN network. Enabling
CRC Control may be suitable for users that need all packets to pass based on their application.
Regardless of the configuration of the CRC Control function, enabled or disabled, the gateway
maintains and reports satellite link statistics on total packets, erred packets, and packet error rate
(PER). Note: CRC Control is only used on the RX satellite link. If an invalid CRC is seen by the
10/100/1000 Interface the packet will be disgarded and will not be transmitted to the satellite
regardless of the CRC Control check box selection.
 Performance: See section 7.4.1.1
 All other configurable items in the demodulator configuration screen should be treated as if
configuring any other satellite modem.
7.4.1.3 BUC and LNB Configuration
To setup the BUC (Figure 7.4.1.3-1) and/or LNB (Figure 7.4.1.3-2), select the corresponding tab
on the satellite link configuration window. Enter the LO frequency and LO Mix (Hi side or Low
side). Click on the Enable button to activate the DC Supply and or 10MHz Frequency Reference
to the BUC or LNB. They are individually controlled with a checked box meaning that they are
enabled, unchecked box meaning that they are disabled.
Once satisfied with the new settings, click on the Apply button to have them take effect.
Warning: Care must be taken to insure that the DC Supply Enable is Disabled when
connecting the SkyWire Gateway to external equipment that cannot accept a DC voltage