Kantronics KPC–3 Plus User Manual page 122

This command sets the limit on the number of times a packet originated by an uplink
(normally a user) at this node may be transferred through other nodes. Each time a
message is handled by a node, the time-to-live for that message is decremented. If the
L3TTL counter reaches zero, the message is discarded. It is possible for network nodes
to create circular paths, and therefore a limit is required to prevent a packet from
relaying in the node system forever. L3TTL should be standardized network-wide.
L4DELAY n
Default 5
This command sets the delay time in seconds used by the node after receiving a level 4
frame from another node before the ack is returned. Frequently there will be data ready
to be passed in the opposite direction shortly after receiving a frame, and this delay
permits the acknowledgment to be "piggy-backed" with the data frame, thus reducing
the number of transmissions on the channel.
L4LIMIT n
Default 900
This command sets a no activity timeout (in seconds) on a node crosslink. When a user
connects to another node, the node first establishes a level 2 (AX.25) connect with that
node, and then establishes a level 4 circuit on behalf of that user. When the user is
finished, the level 4 crosslink is closed, but the level 2 connection remains until the
L4LIMIT is reached, at which point it is terminated. When a user disconnects, the level 2
connection between the nodes remains intact and the L4LIMIT timer is restarted. This
decreases data congestion if another crosslink request using the same path occurs
before the L4LIMIT expires since the node will not have to re-establish the level 2
connect.
L4N2 n
Default 3
This command sets the number of retries used to pass data between nodes (level 4) in
the system. After the L4N2 count reaches zero, alternate paths will be tried.
L4T1 n
Default 120
The L4TI timer sets the time in seconds that the originating node will wait before
resending a level 4 data packet if no acknowledgment is received from the destination
node (end-to-end info-ack). If UTI is set too small, multiple copies of the same packet
will exist within the node system even if the first packet was received correctly.
122
(n = 1 - 60)
(n = 0 - 65,535)
(n = 1 - 127)
(n = 5 - 600)