NS3000/iX Operations and Maintenance Reference Manual (36922-90042)

Appendix A 221
LINKCONTROL Command
NS 3000/iX LAPBMUX Link Statistics
are as follows:
• DTE, for connection to a device that is configured as a DCE.
• DCE, for connection to a device that is configured as a DTE.
Connect Timeout — The Connect Timeout field displays the current
logical link level 2 connection timeout. The
Connect Timeout
parameter sets the amount of time a node will wait for a logical
connection to a remote node to be established. If this timer expires, the
node aborts the connection attempt. The abort process can take several
additional seconds.
Adapter Timeout — The Adapter Timeout field displays the value
specified for the Adapter timer. This timer, also called a heartbeat
timer, is used to monitor whether the system and/or the ACC card are
functioning. The ACC card, and the system, transmit a signal, called a
heartbeat signal, to each other on a specified schedule. If, for example,
the heartbeat does not arrive at the PSI card from the system (or
vice-versa), the card or system waits the number of seconds specified by
this field. If no heartbeat arrives before this timer expires, the link is
dropped. You can determine whether the PSI card or the system failed
by checking to see which device is still active. The default for this field
is 60 seconds and it is recommended that you do not change the value of
this field. The PSI always waits 20 seconds longer than the system
waits before it drops the link.
LAPB Parm T1 — The LAPB Parm T1 field displays the current value
of the T1 timer. The T1 timer waits the specified number of
hundredths-of-seconds for a particular frame to be acknowledged. A
frame that is transmitted, but not acknowledged, before the T1 timer
expires, is retransmitted.
LAPB Parm N2 — The LAPB Parm N2 field displays the maximum
number of times a frame is retransmitted after the LAPB Parm T1
expires. The frame is retransmitted at the LAPB Parm T1 interval for
the number of times specified in this field. When this count is depleted,
the frame is retransmitted at 20 second intervals. If no response is
received after these transmissions, the link is brought down.
A node that is configured with the value specified in LAP-B
CONFIGURATION Parameters output will attempt to retransmit an
unacknowledged frame a maximum of 20 times at T1 intervals.
LAPB Parm K — The LAPB Parm K field displays the configured
number of unacknowledged frames that are allowed in the network at
any given time. For example, if this value is set to seven (7) for a node,
and that node transmits seven (7) packet frames onto the network, it
cannot transmit another frame until one or more of the transmitted
frames are acknowledged.
Modulo Count — The Modulo Count field displays the maximum
frame sequence number allowable for any frame in the network. This