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8-16 SmartSwitch 1800 4.0 User Guide, Rev 01
T1 Retransmit Period
is the length of time before transmission of an I-frame if the previous transmission is
not acknowledged. If the period expires, the software will reset the timer and transmit
a supervisory frame demanding immediate acknowledgment. Also, the
Maximum
Retransmissions
(see that entry) counter will be incremented. The default value of
3000 ms
allows avoidance of unnecessary retransmission of frames that have merely
been delayed.
T2 Wait Ack Period
is the length of time the node will delay acknowledgment of a received I-frame if there
is no outgoing I-frame to be sent. If during this period the node receives an I-frame for
transmission, the acknowledgment will be sent with it, and the delay timer will be
reset.
T3 Link Alive Period
is the length of time after which the node will poll its counterpart if there is no data
transfer.
Logical DCE
defines the port as (if
Y
) logical DCE or (if
N
) DTE. The other end of the connection
must be the opposite of this port. Logical DCE/DTE is independent of physical. A
node connecting a subscriber device into a network should normally be configured as
logical DCE.
Lowest/Highest Incoming/Two-Way/Outgoing Channel
are the ranges of logical channel numbers (LCNs) that subscribers can use for calls
through this port. The valid values for each parameter are determined as follows:
Channel
Valid Values
Lowest Incoming 1
through
Highest Incoming
Highest Incoming
Greater than/equal to
Lowest Incoming
Lowest 2-Way
Greater than
Highest Incoming
Highest 2-Way
Greater than/equal to
Lowest 2-Way
Lowest Outgoing
Greater than
Highest 2-Way
Highest Outgoing Lowest Outgoing
through
4095
Changing any parameter to a value that violates this order automatically changes any
other values now in violation, specifying the first value(s) within the valid range. If
any pair is not used, its constraints apply to the next higher or lower pair (whichever
is appropriate) in the above list.
Flow Control Negotiation
is an optional X.25 facility that permits negotiation of the flow control parameters
(packet and window sizes for either direction of data transmission) on a per call basis.
If
N
is selected, the default packet and window sizes will be used. If
Y
is selected, a
packet and/or window size included in a call packet will be used. (If either is not
included, the default for that parameter will be used.)
Throughput Class Negotiation
is an optional X.25 facility that permits negotiation of the throughput classes for either
direction of data transmission on a per call basis. If
N
is selected, the default (
Maximum
Throughput Class
) will be used. If
Y
is selected, any throughput class included in a call
packet will be used. (If a class for either direction is not included, its default value will
be used.)