NavCom SR-7120 Rev.A - Manual (Page 35)

Safari Network User Guide
2-9
Channel Assignments and Bandwidth
The term bandwidth in the context of the Safari Network
simply means data rate, or capacity. The amount of data
that is, or can be, sent through a given communications
circuit per second. After assigning a Channel ID to a
service, you must set the amount of forward and/or return
bandwidth for that Channel. As bandwidth values are
assigned, the total forward or return bandwidth is
decreased by the same amount.
The total bandwidth of the Safari Network radio module is
512k, with 51.2k being allocated to network resources.
The remaining 460.8k is split equally between Forward
and Return. Forward bandwidth is the amount of data
transmitted from the NCU to other destinations; Return
bandwidth is the amount of data received by the NCU.
The sum of all forward bandwidth assigned to services
cannot exceed the forward radio bandwidth (230.4k), and
the sum of all return bandwidth assigned to services
cannot exceed the return radio bandwidth (230.4k). The
preset bandwidth choices are detailed in Table 2-4.
Bandwidth vs. Throughput Matrix
512K 240K 96K
230.4 108.0 43.2
204.8 96.0 38.4
179.2 84.0 33.6
153.6 72.0 28.8
128.0 60.0 24.0
102.4 48.0 19.2
76.8 36.0 14.4
51.2 24.0 9.6
25.6 12.0 4.8
Table 2-4: Safari Network Bandwidth/Throughput Options