Buck Rogers K4ABT Instrukcja Operatora Pobierz pdf (Strona 42)

The Packet Radio “2 N 1” Handbook by Buck Rogers K4ABT

Section II; TheNET X1J4 System Node Operators Handbook __ Page 42

Parameter 12

Transport busy delay (seconds) (minimum=1, maximum=1000)

Defines the maximum number of seconds that the transport layer will

remain "choked" as the result of an incoming message that has the

choke flag bit set. The purpose of this timeout is to prevent an

indefinite hang-up in the event that the "unchoke" message is lost.

Parameter 13

Transport requested window size (frames) (minimum=1,

maximum=127)

Defines the maximum number of incoming out-of-sequence

information messages that the transport layer will buffer while

waiting for the next expected information message to arrive. Also

defines the maximum number of outgoing information messages that

the transport layer will send without receiving acknowledgment.

Parameter 14

Congestion control threshold (frames) (minimum=1,

maximum=127)

Defines the maximum allowable backlog of messages that the

transport layer will buffer before it sends a choke message.

Also defines the maximum allowable backlog of frames that the link

layer will buffer before it sends an RNR control frame.

Parameter 15

No-activity timeout (seconds) (minimum=0, maximum=65535)

Defines the maximum number of seconds that a transport-layer

circuit or a link-layer connection can remain idle (i.e., no information

transfer in either direction) before it is automatically disconnected.

Parameter 16

P-persistence (p=/256) (minimum=0, maximum=255)

Together with slot time (parameter #17), defines the exponential

delay algorithm used by the node when keying up its transmitter.

When the node has something to transmit and the frequency is

clear, the node generates a random integer in the range 0 - 255. If

the random number is less than or equal to the P-persistence

parameter, the node keys up its transmitter immediately. Otherwise,

the node delays for one slot time, generates a new random number,

and repeats the procedure. The default value of 64 corresponds to a

probability of 0.25.

Parameter 17

Slot time (10ms increments) (minimum=0, maximum=127)

Together with P-persistence (parameter #16), defines the

exponential delay algorithm used by the node when keying up its

transmitter. The default value of 10 corresponds to a slot time of

100 milliseconds.

Parameter 18

Link T1 timeout "FRACK" (seconds) (minimum=1, maximum=15)

Defines the number of seconds between link-layer retries. When

digipeating is used, this value is multiplied by 2D+1, where D is the

number of digipeaters.

Parameter 19

Link transmit window size "MAXFRAME" (frames)

(minimum=1, max=7)

Defines the maximum number of outgoing information frames that

the link layer will send without receiving acknowledgment.

Parameter 20

Link maximum tries ( minimum=0, maximum=127)

Defines the maximum number of tries that the link layer will attempt

before reporting a link failure. If this parameter is set to zero, the link

layer will retry forever (not recommended).

Parameter 21

Link T2 timeout (10ms increments) (minimum=0, maximum=65535)

Defines the delay (measured in 10-millisecond increments) used by

the link layer from the time it receives an information frame until it

sends an acknowledgment

(RR, RNR, or REJ) control frame. The purpose of this delay is to

give the acknowledgment an opportunity to be "piggybacked" upon

an outgoing information frame.

Parameter 22

Link T3 timeout (10ms increments) (minimum=0, maximum=65535)

Defines the maximum no-activity period (measured in 10-millisecond

increments) permitted by the link layer before it issues a poll to make

sure the link is still intact. This timeout is also used to break link-

layer choke deadlocks. NOTE: This parameter is the same as the

CHECK command in many TNCs, and can be defaulted to 0 as a

means of reducing "Node QRM".

Parameter 23

AX.25 digipeating (1=enabled, 0=disabled), (minimum=0,

maximum=1)

Defines whether or not the node will perform AX.25 digipeating. The

default value of 1 causes digipeating to be enabled.

Parameter 24

Validate callsigns (1=enabled, 0=disabled) (minimum=0,

maximum=1)

Defines whether or not the node will perform validation checks on

amateur callsigns. The default value of 1 causes callsign validation

to be enabled. NOTE: If callsign validation is turned OFF (0), users

will experience long delays if they request connects to inactive nodes

before getting back a "Failure with" response.

Parameter 25

Station ID beacons (2=on, 1=conditional, 0=off) (minimum=0,

maximum=2)

Defines whether or not the node will broadcast station-identification

beacons. The default value of 2 causes station identification to be

broadcast every 10 minutes. The value of 1 causes station

identification to be broadcast only if the node has transmitted since

the last beacon. The value 0 disables station identification beacons

altogether.

Section 1; Packet Radio “The Basics” Section 2; Revised 9, 9, 2009 System Node Operator’s Handbook

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