User`s manual

Command Descriptions, Continued
dn window
Displays the transmit “window” for the
HDLC protocol used by DataNET. This is
the number of I-frames that a station may
send before it must receive an
acknowledgment from the receiving
station.
dn window num
Sets the transmit window used by all
ports on the hub. The parameter “num”
must be a number 1 through 7. The
default window size is 7. The hub does
not store the window size parameter in
non-volatile memory, so non-default
values will be lost after a reset.
dn polldelay
The “poll delay” parameter applies only
to ports 1-8 on a hub. It controls the time
a hub will wait between polls of any port.
As soon as a hub finishes an exchange
of messages on one port, it will normally
advance immediately to the next
“connected” port and begin the next
exchange of messages. If “poll delay” is
set to a non-zero value, the hub will
enforce a delay before each new
exchange begins. The “poll delay” is
given in milliseconds and defaults to zero
(no delay).
dn polldelay time
Sets the poll delay to the value given, in
milliseconds. Actual times are rounded
down to the nearest ten milliseconds.
dn portdelay
This parameter gives the delay, in
milliseconds that a hub will enforce
between message exchanges with a
particular slave device. That is, before
initiating a poll to a slave device, the hub
will make sure that at least this much
time has elapsed since the last poll to the
same device. This keeps a hub from
consuming all of the slave device’s
processing time by continuously polling it
at short intervals. This parameter
defaults to 50 milliseconds.
76 • Command Summary