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11-6 SmartSwitch 1800 4.0 User Guide, Rev 01
Controller Type
A
= Use this if you don't care or are not sure which type to select.
B
= 2780
C
= 3780
D
= 3740
E
= 2770
F
= 3770
Full Duplex
specifies full-duplex transmission (both directions at once). Currently, this must be
configured as
Y
.
# of Beginning Sync Chars
specifies the number of synchronization characters that will be added to the beginning
of each frame.
# of Trailing Pad Chars
specifies the number of padding characters that will be added to the end of each frame,
to ensure that the last significant character is sent before the data transmitter switches
off.
No Response Timer
is activated after transmission of a general poll or a data frame. On expiry, a NAK–
EOT–General Poll sequence is transmitted, and the No Response Retry Count is incre-
mented. The timer will be de-activated on reception of any valid frame from the line
during Link Down.
No Response Retry Count
specifies how many times the user device will be polled (if it is not responding) before
control is passed on the next cluster (accompanied by other condition checks).
Delay Timer
is activated when the application queue is empty; i.e., when data from the network is
pending. On expiry, a TTD (Temporary Text Delay) is sent and the timer is restarted.
After the final retry, an EOT is sent to the line, and a Clear Request is sent to the
network.
Delay Retry Count
specifies the number of times the node will retransmit a TTD when there is no data
pending from the network. Once the count reaches the specified value, the node will
issue an EOT and clear the virtual circuit.
NAK Retry Count
specifies the number of times the node will send a frame when the receiving device is
unable to acknowledge; that is, returns a NAK to the node.
VC to be Cleared After Disc
specifies whether the virtual circuit will be cleared after completion of a file transfer.
Idle Timer
is activated on reception of an EOT from the line. On expiry, an EOT is sent to the line
and a Clear Request is sent if
VC to Be Cleared After Disc
is
Y
.