Icom SB-110, Инструкция по эксплуатации, Страница: 62 / 102

5-2 [Detail settings] Screen (continued from the previous page)
■
Hidden Terminal
50
SETTING SCREEN
5
A
Communication
Collision
SB-110 [B]
Radio Transmission Area
SB-110 [B]
Radio Transmission Area
Wireless terminal [A]
Radio Transmission Area
Wireless terminal [C]
Radio Transmission Area
C
B
Wireless terminal [A]
Radio Transmission Area
Wireless terminal [C]
Radio Transmission Area
For the communication in the Access Point mode, as
shown below, even if the terminals [A] and [C] can com-
municate with SB-110 [B], those terminals [A] and [C] can-
not communicate with each other. In this case, the termi-
nal [A] is referred to as "Hidden Terminal" to [C] and the
terminal [C] is also referred to as "Hidden Terminal" to [A].
If there is any hidden terminal, the carrier sense does not
function effectively to those wireless terminals. So, com-
munication collision happens frequently in SB-110 [B] and
the throughput (the amount of information transmitted
within a specified period) decreases.
To prevent the communication collision, SB-110 [B] which
received the request-to-send (Rts) signal sends the Clear-
to-send (Cts) signal repeatedly to the wireless terminals
[A] and [C]. Then, either of those two wireless terminals,
which does not send Rts, can recognize that SB-110 [B] is
communicating with the hidden terminal.
Now, the wireless terminal [A] or [C] , which does not send
Rts, forbears the access to SB-110 [B] and the communi-
cation collision can be prevented.
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