Furuno FELCOM 70, Operator'S Manual

Page: 202 / 216

7. TROUBLESHOOTING
7-16
7.3 Throughput
In case of low throughput in data communication
In the Inmarsat satellite line, approximately 240ms delay time occurs. The delay
causes the throughput of the TCP/IP protocol in the satellite line to go lower than
the terrestrial line. In this case, if you change the window size of the TCP, the
throughput may improve.
The window size of the TCP can be changed in the registry of Windows OS.
However, wrong setting of the registry may cause fatal error. Therefore, we
recommend that you use the following software which changes only the registry
concerned with the TCP.
Example: Dr.TCP http://www.dslreports.com/drtcp/
Note:
FURUNO assumes no responsibility or liability for this software. Be sure to
backup the registry BEFORE changing it.
The method required to change window size may differ depending on OS or
router.
About throughput variation
Throughput variation, resulting from time delay, may occur when TCP/IP
protocol is used on the satellite line.
Throughput variation occurs when the load on a server used by a terrestrial
client fluctuates greatly because many clients are accessing the server at the
same time. Additionally, it may occur depending on the terminal adapter pairing
between mobile and terrestrial clients.