|
SeaNet
"Dial-Up" Fleet Traffic 2000
|
|
Total
Time
|
6654
minutes |
|
Total
Data Flow
|
687
MBytes
|
|
Average
Data Rate
|
1.72
Kbytes/sec |
|
Total
Cost
|
$66,540 |
|
$Equivalent
IntelSat Bandwidth
|
666kHz |
|
TABLE 1
Table 1 above summarizes the actual traffic and cost of the
SeaNet operations on the UNOLS fleet during 2000 utilizing the InmarSat
system. This system operates as a "dial-up" Internet connection
with a per-minute tariff.
|
|
ROADNet
Model High-Seas Network
|
|
Link
|
Data
Rate (kbps)
|
Required
Bandwidth (kHz)
|
|
Ship
1 Inbound
|
64
|
97.2
|
|
Ship
2 Inbound
|
64
|
97.2
|
|
Ship
3 Inbound
|
64
|
97.2
|
|
Ship
Outbound
|
64
|
163.4
|
|
Fixed
Site Outbound
|
19.2
|
29.2
|
|
Fixed
Site 1 Inbound
|
19.2
|
38.2
|
|
Fixed
Site 2 Inbound
|
19.2
|
46.4
|
|
Fixed
Site 3 Inbound
|
64
|
97.2
|
|
Total
|
|
666kHz
|
|
TABLE
2
For comparison, table 2 shows how the same $ could be used for the
high-seas extension of ROADNet. The 666 kHz satellite bandwidth could
accommodate 3 ships each with dedicated 64 kbps inbound channels and
3 fixed stations each with 19.2 kbps dedicated inbound channels with
two shared 64 kbps outbound channels.
Abstract
>
|
