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IS IT POSSIBLE TO USE 1.8 VSAT FOR TV

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Jun 4th, 2007 at 12:07pm  
HI ERIC,
PLS IS IT POSSIBLE TO USE A 1.8 METER C-BAND VSAT TO BOTH INTERNET AND CABLE INSEAD OF HAVING A SEPERATE 90CM KUBAND DISH FOR THE CABLE TV WHILE THE C-BAND REMAIN FOR INTERNET ACCESS.
PLS ADVICE.
THANKS,
SAM.
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Eric Johnston
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Reply #1 - Jun 4th, 2007 at 1:28pm  
If the Ku band TV programming comes from a different, but close by, satellite I would try putting a TV Ku band feed/LNB by the side of the main C band feed/LNB/BUC. Keep the main dish and C band system optimised for the tx-rx VSAT operation and experiment with Ku band receive-only feed positions to see if you can get a signal. The new feed will need to be on the opposite side to the new satellite, since the dish is a reflector.

If the Ku band TV and C band VSAT operation are on the same satellite then an expensive C/Ku band feed is a theoretical possibility.  The danger is that a dubious C/Ku band feed might degrade the 6 GHz transmit cross polarisation or increase off-axis sidelobe emissions and cause you to interfere with someone else's service.  It will be much safer to have a dedicated 90cm dish and Ku band feed/LNB for the TV.

Best regards. Eric.
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« Last Edit: Jun 4th, 2007 at 7:15pm by Eric Johnston »  
 
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Reply #2 - Jun 6th, 2007 at 12:32pm  
HI ERIC,
PLS BELOW IS AN ERROR MESSGAE THAT IM HAVING WITH MY IDIRECT 5000 MODEM. I CANT RUN COMMANDS AS A RESULT OF THIS.
                                      

iDirect Linux 2.4.24-uc0-iDirect0                                 
Kernel 2.4.24-uc0-iDirect0 on an armv5b                                       

iDirect login: root                  
Password:         
Linux iDirect 2.4.24-uc0-iDirect0 #1 Thu Feb 1 11:13:30 EST 2007 armv5b unknown                                                                              
# telnet 0         

Entering character mode                      
Escape character is '^]'.                        

Username: admin               
Password: *********                  


[ErrorStack] admin@telnet:127.0.0.1;1024                                       
> help      
DID             Show modem identification number                                                
eth             Show the output of ifconfig command                                                   
netstat         Show the output of a netstat command                                                   
nmsr            Debug NMS Reportin                               
ps              Show the output of the ps command                                                
status          Display FIPS status                                  

[ErrorStack] admin@telnet:127.0.0.1;1024                                       
> eth    
lo      RX Bytes: 6947 Packets: 123 Errors: 0 Drops: 0                                                      
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0                                                      

       TX Bytes: 6947 Packets: 123 Errors: 0 Drops: 0                                                      
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0                                                         

teql0   RX Bytes: 0 Packets: 0 Errors: 0 Drops: 0                                                
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0                                                      

       TX Bytes: 0 Packets: 0 Errors: 0 Drops: 0                                                
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0                                                         

tunl0   RX Bytes: 0 Packets: 0 Errors: 0 Drops: 0                                                
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0                                                      

       TX Bytes: 0 Packets: 0 Errors: 0 Drops: 0                                                
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0                                                         

gre0    RX Bytes: 0 Packets: 0 Errors: 0 Drops: 0                                                
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0                                                      

       TX Bytes: 0 Packets: 0 Errors: 0 Drops: 0
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0

sit0    RX Bytes: 0 Packets: 0 Errors: 0 Drops: 0
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0

       TX Bytes: 0 Packets: 0 Errors: 0 Drops: 0
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0

ixp0    RX Bytes: 0 Packets: 0 Errors: 0 Drops: 0
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0

       TX Bytes: 0 Packets: 0 Errors: 0 Drops: 0
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0

ixp1    RX Bytes: 23814 Packets: 177 Errors: 0 Drops: 0
       RX FIFO: 0 Frame: 0 Compressed: 0 Multicast: 0

       TX Bytes: 378 Packets: 5 Errors: 0 Drops: 0
       TX FIFO: 0 Collisions: 0 Carrier: 0 Compressed: 0


[ErrorStack] admin@telnet:127.0.0.1;1024
>
THANKS.
SAM
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Reply #3 - Jun 6th, 2007 at 10:22pm  
The eth command appears to display the output of the ifconfig command.  It is showing a variety of router interfaces.

Here is a link that may help: http://www.computerhope.com/unix/uifconfi.htm  I am guessing that ifconfig on iDirect works similar to linux.

Maybe it is possible to get more details about interface lo ? e.g. ifconfig lo  What is interface lo ?   Is this your LAN connection with a PC ?  Is the ethernet cable plugged in properly, pins undamaged ?  

netstat -i might be interesting.
see http://www.faqs.org/docs/linux_network/x-087-2-iface.netstat.html

If there are packets with errors are these coming over the satellite or from the local LAN.  If you suspect the satellite link try to extract information out about the receive satellite transmission, like bit error rate before and after FEC.  Try running a long LAN ping 127.0.0.1 -t to the modem. There should be no errors.

Please would someone else with a knowledge of iDirect help answer this.  Many thanks.

Best regards, Eric.
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