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10-6 SmartSwitch 1800 4.0 User Guide, Rev 01
Maximum Retransmissions
is the maximum number of times the node will attempt to send an I-frame after a
Retransmission Period
expiration. A larger value for this parameter increases the prob-
ability of an eventual successful transmission, but a smaller value permits faster
detection of a permanent error condition.
Maximum Bytes per Frame
is the maximum frame size that will be transmitted on the port.
Generate Clock
specifies whether the port will generate the clock necessary to synchronize traffic over
the link. If the port is a physical DCE (determined by the port's I/O cable interface),
set this parameter to
Y
, since the physical DCE generates clock. If the port is DTE, set
the parameter to
N
.
Rcv Clock (TT) from DTE
allows the clock to be looped back from the DTE using the TT (Terminal Timing)
signal, which can be helpful on high-speed lines. Generally, if the local interface is
physical DCE and the line speed is above 256 Kbps, this parameter should be set to
Y
.
(Make sure the remote DTE is configured to provide the terminal timing.)
Activate Connection w/o poll
will (if enabled) activate the TPAD connection without a poll of the connected device.
Answer Non-Configured
will (if
Y
) allow the HPAD to respond to all devices on the line. If
N
, the HPAD will
respond only to those devices that are configured on the node.
Clear VC on Last Device Down
if
Y
, causes the virtual circuit to be cleared when no terminals are using it.
Multidrop
specifies whether transmisison will be multidrop (several stations between end points)
or point-to-point.
Slow Poll Retry Count
applicable only to connections configured for multidrop, specifies how many times
the control unit (CU) will be polled (if it is not responding) before it is put on the "slow
poll" list. CUs on the slow poll list will be polled with a frequency determined by the
parameter
Slow Poll Retry Frequency
.
Slow Poll Retry Frequency
specifies the number of times active CUs will be polled between pollings of the CUs
on the slow poll list.
# of Beginning Sync Char
specifies the number of synchronization characters that will be added to the beginning
of each frame.
# of Trailing Pad Characters
specifies the number of padding characters that will be appended to each frame, to
ensure that the last significant character is sent before the data transmitter switches off.