Buck Rogers K4ABT Handbook page 41

; Packet Radio "The Basics"
Section 1
The following definitions provide a short explanation of the purpose and use of the 26 parameters listed
in the above table.
Parameter 1
Max destination list entries
Defines the maximum allowable number of destinations in the node's
routing table. Each destination consumes 32 bytes of RAM. The
sysop or network manager can use this parameter to limit the
amount of RAM that is allocated to the routing table, thus ensuring
that sufficient space remains for frame buffering.
Parameter 2
Worst quality for auto-updates (minimum=0, maximum=255)
Defines the poorest route quality that will be automatically added to
the node's routing table. The network manager 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
Radio port 0 (HDLC) quality
Defines the quality of the radio frequency connected to the node's
HDLC port. The network manager should set this parameter to an
appropriate quality value in accordance with the speed, reliability,
and congestion anticipated on the frequency. The default value of
192 is appropriate for a 1200-baud user-accessible frequency...if the
actual frequency quality is better (e.g., a UHF backbone frequency)
or worse (e.g., an HF link), the parameter value should
be changed accordingly.
Parameter 4
Comm port 1 (RS232) quality (minimum=0, maximum=255)
Defines the quality of the TNC-to-TNC interconnect frequency
connected to the node's RS232 port. The network manager should
set this parameter to an appropriate quality value in accordance with
the speed, reliability, and congestion anticipated on the frequency.
The default value of 255 is appropriate for a 9600-baud two-modem
interconnect cable...if the actual frequency quality is worse (e.g., a
three- or four-port interconnect, or a satellite link), the parameter
value should be changed accordingly.
Parameter 5
Obsolescence count initializer (minimum=0, maximum=255)
Defines the initial value given to the obsolescence count of a route
that has been newly added or updated by the node's automatic
routing table update mechanism. The obsolescence count of a route
is also reinitialized to this value whenever the route is actually used
successfully. The obsolescence count of a route is decremented
once each auto-update broadcast interval (see parameter 7 below).
However, such periodic decrementing of route obsolescence counts
can be disabled altogether by setting this parameter to zero.
Section II
"2 N 1" Handbook
The Packet Radio
Section 2
(minimum=1, maximum=400)
(minimum=0, maximum=255)
; TheNET X1J4 System Node Operators Handbook __ Page 41
Buck Rogers K4ABT
by
; The X1J4 System Node Operator's (SNO) Handbook
Parameter 6
Obsolescence count minimum to be broadcast
maximum=255)
Defines the minimum obsolescence count threshold below which a
route will not be included in the node's automatic routing broadcasts.
The purpose of this threshold is to prevent the node from
broadcasting "stale" routing information to other nodes.
normal circumstances, this parameter should be assigned a value
no greater than the value of parameter 5 (obsolescence count
initializer); if it is greater, the node's broadcasts
will include no destinations other than itself.
Parameter 7
Auto-update broadcast interval (seconds)
maximum=65535)
Defines the number of seconds between automatic routing
broadcasts issued by the node. The default value of 3600 specifies
an hourly broadcast.
altogether by setting this parameter to zero.
Parameter 8
Network "time-to-live" initializer (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.
persisting forever as the result of a routing loop. The value of this
parameter should be a bit larger than number of "hops" in the
longest legitimate route in the network.
Parameter 9
Transport timeout (seconds)
Defines the number of seconds between transport-layer retries.
Parameter 10
Transport maximum tries
Defines the maximum number of transport-layer tries attempted
before a circuit failure is reported.
Parameter 11
Transport acknowledge delay (seconds) (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 acknowledgment an opportunity to be "piggybacked" upon
an outgoing information message.
(minimum=1,
(minimum=0,
In addition, broadcasts can be disabled
This protects the network against frames
(minimum=5, maximum=600)
(minimum=2, maximum=127)
Under