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Chapter 5 Packet Operation
Set
RELINK ON if you want the DSP to automatically try to reconnect to another packet station if the link fails.
RESptime
n Default: 0 (000 mS)
Mode: packet Host: RP
“n” 0 to 250 specifies 100 mS increments.
RESPTIME adds a minimum delay before your DSP sends ack nowledgment packets. This delay may run
concurrently with the default wait time set by
DWAIT
and any random wait in effect.
During a file transfer,
RESPTIME
can help avoid data and acknowledgement collisions caused by the sending
stations’ TNCs pausing briefly between transmitted data frames.
REtry
n Default: 10
Mode: packet Host: RY
“n” 0 to 15 specifies the maximum number of packet retries before the DSP “gives up” sending that packet.
The AX.25 protocol uses the retransmission of frames that haven’t been
acknowledged as a means to insure that all
transmitted frames are received. The number of retries that the DSP will attempt is set by this command. If the
number of retries is exceeded, the packet link may be lost.
SEndpac
n Default: $0D (
CTRL-M
)
Mode: packet or ( RETURN )
Host: SP
“n” 0 to $7F (0 to 127 decimal) specifies an ASCII character code.
Use
SENDPAC
to select the character used to cause a packet to be sent in Converse mode. The parameter “n” is
the ASCII code for the character you want to use to force your typed input to be sent. Use the default SENDPAC
value, $0D, for ordinary conversation with
ACRPACK ON
to send packets at natural intervals.
SLottime
n Default: 30 (300 mS)
Mode: packet Host: SL
“n”
0 to 250 specifies the time the DSP waits between generating random numbers to see if it can transmit.
The
SLOTTIME
parameter works with the
PPERSIST
and
PERSIST
parameters to achieve true p-persistent
CSMA (Carrier-Sense Multiple Access) in packet operation.
SQuelch ON
|
OFF
Default: OFF
Mode: packet Host: SQ
OFF Your DSP responds to negative-going squelch voltage.
ON
Your DSP responds to positive-going squelch voltage.
Normally, your DSP uses its CSMA (Carrier Sense Multiple Access) circuit to decide whether or not it’s clear to
transmit on a packet channel. If there are non-packet signals on the channel you’re using—such as voice—you’ll
want to use true RF-carrier CSMA by monitoring the squelch line voltage from your radio.
With
SQUELCH OFF , the DSP inhibits transmissions when there is a positive voltage on the radio connector’s
squelch input line. When there is no voltage or connection to this pin, the DSP allows packets to be sent.
With
SQUELCH ON
, the DSP will inhibit packet transmissions when no voltage is applied to the squelch input pin
on the Radio connector.
5-44 September, 05