Click on a PARAMETER number to jump to the definition for that parameter.
For "LOCKED" node applications and information, click on the blue "1200 Baud
or 9600 Baud" headers. The settings shown for the 1200 baud user port and
the 9600 baud backbone are the node settings and are shown as example only.
The hierarchy shown allows a "natural" migration of data packets from the
user port onto the backbone. This is an exception and not the rule. Other
networks may use a different concept and the author does not endorse any
partictular routing scheme as "too many cooks have already spoiled the
broth" by trying to make network configuration complicated. It is true that
a measure of "node" common-sense, should be applied when setting up a
network.
| Parameter 1 Max destination node list size;
(default=100, minimum=1, maximum=400) |
| Defines the maximum number destination nodes allowed in the node's
routing table. Each destination consumes 32 bytes of RAM. The system
node operator (SNO) can use this parameter to limit the amount of RAM
that is allocated to the routing table, thus ensuring that sufficient
space remains for other node buffers. Normally there are 720 free
buffers in the X-1J4 node at startup. |
|
| Parameter 2 Worst quality for auto-update;
( default=60, minimum=0, maximum=255) |
| Defines the poorest route quality that can be added to the node's
automatic routing table. The system node operator (SNO) can use this
parameter to limit the automatic routing update function to accept only
higher-quality routes. In addition, the automatic update function can be
disabled altogether by setting this parameter to zero. |
|
| Parameter 3 Channel 0 (Radio Port) quality;
(default=60, minimum=0, maximum=255) |
| Defines the quality of the radio channel connected to the node's
HDLC port. The system node operator (SNO) should set this parameter to
an appropriate quality value in accordance with the speed, reliability,
and congestion anticipated on the channel. The default value of 192 is
appropriate for a 1200-baud user-accessible frequency. |
|
| Parameter 4 Channel 1 (RS232 Port) quality;
( default=255, minimum=0, maximum=255) |
| Defines the quality of the TNC-to-TNC interconnect channel connected
to the node's RS232 port. The system node operator (SNO) should set this
parameter to an appropriate quality value in accordance with the speed,
reliability, and congestion anticipated on the channel. The default
value of 255 is appropriate for a 9600-baud two-modem interconnect
cabled gateway. |
|
| Parameter 5 Obsolescence count initializer;
( default=9, minimum=0, maximum=255) |
| Defines the initial value given to the obsolescence counter of a
route that has been recently added or updated by the node's automatic
routing table. The obsolescence count of a route is also reinitialized
to this value whenever the route is successfully used or when the period
set to the noted value shown in the STATS table of the X-1J4 node. The
obsolescence count of a route is decremented once each auto-update
broadcast interval (see parameter 7). Periodic decrementing of route
obsolescence counts can be disabled altogether by setting this parameter
to zero (0). |
|
| Parameter 6 Obsolescence count minimum to be
broadcast ( default=5, minimum=1, maximum=255) |
|
| In the X-1J4 node, this parameter defines the minimum obsolescence
count threshhold below which a route will not be included in the node's
automatic routing broadcasts. The purpose of this threshhold is to
prevent the node from broadcasting out dated routing information to
other nodes. Under normal circumstances this parameter should be
assigned a value no greater than the value of parameter 5. If parameter
5 is greater, the X-1J4 node's broadcasts will NOT include destination
nodes other than itself. |
|
| Parameter 7 Auto-update broadcast interval
(seconds) ( default=1800, minimum=0, maximum=65535) |
|
| Defines the number of seconds between automatic routing broadcasts
issued by the node. The default value of 3600 specifies an hourly
broadcast. X-1J4 node broadcasts can be disabled altogether by setting
this parameter to zero (0). |
|
| Parameter 8 Network TIME TO LIVE
initializer ( default=16, minimum=0, maximum=255) |
|
| Defines the initial value of the time-to-live; field
in the Network Header of all network-layer frames originated by this
node. The time-to-live field is decremented by each intermediate node
that relays the frame. If the time-to-live value ever reaches
zero, the frame is discarded. This protects the network against frames
living forever as the result of a routing loop. |
|
| Parameter 9 Transport timeout (seconds) (
default=180, minimum=5, maximum=600) |
|
| Defines the number of seconds between transport-layer retries. |
|
| Parameter 10 Transport maximum tries (
default=3, minimum=2, maximum=127) |
|
| Defines the maximum number of transport-layer tries attempted before
a circuit failure is reported. |
|
| Parameter 11 Transport acknowledge delay
(seconds) ( default=2, minimum=1, maximum=60) |
| Defines the number of seconds' delay used by the transport layer
from the time it receives an information message until it sends an
information-acknowledge message. The purpose of this delay is to give
the acknowledgement an opportunity to be added to another outgoing
information frame or packet. |
|
| Parameter 12 Transport busy delay (seconds)
( default=60, 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 infinite hangup in the event that the unchoke message
is lost. |
|
| Parameter 13 Transport requested window
size (frames) ( default=4, 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 acknowledgement. |
|
| Parameter 14 Congestion control threshhold
(frames) ( default=4, 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 receive-not-ready (RNR) control frame. |
|
| Parameter 15 No-activity timeout (seconds)
(default=900, 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) (
default=64, 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 channel 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. |
|
| Parameter 17 Slot time (10ms increments)
( default=10, 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.
NOTE to the wise... and maybe the "unwise," setting this parameter to
0 (zero) may make the node respond fast! Maybe too fast. |
|
| Parameter 18 Link T1 timeout frack;
(seconds) ( default=5, minimum=1, maximum=15) |
| Defines the number of seconds between link-layer retries. When
digipeating is used, this value is multiplied by 2 x D+1, where D is the
number of digipeaters. |
|
| Parameter 19 Link transmit window size
maxframe; ( default=3, minimum=1, maximum=7) |
| Defines the maximum number of outgoing information frames that the
link layer will send without receiving acknowledgement. |
|
| Parameter 20 Link maximum tries (
default=10, 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 (0),
the link layer will retry forever (we recommend that this parameter is
NEVER set to zero (0) ). |
|
| Parameter 21 Link T2 timeout (10ms
increments) (default=200, 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 acknowledgement (RR, RNR, or REJ) control frame. The purpose of
this delay is to give the acknowledgement an opportunity to be attached
to another outgoing information frame. |
|
| Parameter 22 Link T3 timeout (10ms
increments) (default=0, 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
CHECK, and can be defaulted to 0 as a means of reducing node QRM. |
|
| Parameter 23 AX.25 digipeating (1=enabled,
0=disabled) (default=0, 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) (default=1, 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) (default=2, 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. A zero (0) will disable station identification.
|
| NOTE; Many sysops set this parameter to 0 as a means to
reduce unnecessary node QRM on the channel. The X-1J4 node ID's itself
each time it sends a packet, so no legal requirement to have ID's turned
on. |
|
| Parameter 26 CQ Broadcasts (1=0n, 0=off)
(default=1, minimum=0, maximum=1) |
| Defines whether or not the node will broadcast AX.25 UI-frames in
response to the CQ command. Even if such broadcasts are disabled by
setting this parameter to zero, the other features of the CQ command
continue to operate normally. The default value of 1 enables CQ
broadcasts. NOTE; When a station connected to an X-1J4 node
through several distant nodes issues a UI QRA command, the
distant node will poll stations that have the QRA feature for an ID.
After about 40 seconds, the station that sent the polling (UI QRA) can
issue the Mheard command and receive a list of the station that
identified in the area of the distant X-1J4 node that was polled. |
|
WebMaster, Buck Rogers K4ABT "