Cabletron Systems Netlink FRX4000 User Manual page 192

Ack
Controller Type
Full Duplex
# of Beginning Sync Chars
# of Trailing Pad Chars
No Response Timer
No Response Retry Count
Delay Timer
Delay Retry Count
11-6
specifies which methods of acknowledgement will be used:
= ETB:loc, ETX:end – local acknowledgement of transmission blocks,
A
end-to-end acknowledgement of text.
= ETB:end, ETX:end – end-to-end acknowledgement of transmission blocks
B
and text.
= ETB:loc, ETX:loc – local acknowledgement of transmission blocks and
C
text.
ETB = End of transmission block, ETX = End of text.
= Use this if you don't care or are not sure which type to select.
A
= 2780 = 3780
B C
specifies full-duplex transmission (both directions at once). Currently, this must be
configured as .
Y
specifies the number of synchronization characters that will be added to the beginning
of each frame.
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.
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.
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).
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.
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.
= 3740 = 2770
D E
= 3770
F
FRX4000/FRX6000 4.0 User Guide, Rev 01