(2) In this status, it waits until the slot time elapses, and generates a new random code again.
(3) If the number is higher, it’s “blank” again.
(4) Again, it’s waiting for another slot time.
(5) This time the number is lower than the parameter. It’s a HIT and goes to transmit.
If the other stations start transmitting, it stops counting the slot time, and generates code when
the incoming signal is gone.
(C) Transmission for Ham radio use
PTT [Flag TX] | [Packet TX]
TXDELAY
(1) (2) (3) (4)
(1) As it goes to transmission, PTT turns ON and starts transmitting the Flag signal. The Flag
signal is to show the partition of the packet and to synthesize the data clock.
(2) The data transmission is held until the TXDELAY time elapses. The TXDELAY must be
calculated including the physical timing of the RX/TX change of the radio, and the Flag
period of the reception side of the packet. The Sleep feature is not recommended, but if it is
activated at the reception side, it must be considered to determine the delay period.
(3) When the TXDELAY period is elapsed, the packet data will start transmitting.
(4) PTT is released when the packet is sent.
4-2-1 PPERSIST command
abbrev. PP default: ON parameter: ON/OFF
example: PP ON
This command selects whether the P-PERSIST CSMA system is enabled or not. If it’s ON, it
enters the PP CSMA mode. It detects the carrier, and when the channel is empty, it starts
generating the code for a slot. This is to avoid all waiting stations starting their transmissions at
the same time causing a conflict. In the OFF position, the system remains Persistent CSMA. The
unit transmits after the DWAIT period is elapsed.
4-2-2 PERSIST command
abbrev. PE default: 128 parameter 0 to 255
example: PERSIST 63
This will select the parameter of the P-Persistent CSMA random code “hit” probability as
previously described. If the higher number is set, the chance to “hit” increases but the potential
conflict with others also may increase. If you set the value lower, the risk of conflict decreases but
you cannot transmit a sequence of packets rapidly.
(47 paginas)
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