8-16 Smart Switch 1800 4. 0 User Guide , Rev 0 1
T1 Retransmit Period
is the length of time before transmission of an I-frame if the previous transmission is
not acknowledged. If the perio d expires, the software will reset the timer and tra nsmit
a sup ervisor y fr ame demandi ng im media te ac know ledgment . A lso, t he M aximum
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 de layed.
T2 Wait Ack Period
is the length of time the node will delay ac knowledgment of a received I-frame if there
is no outgoing I-frame to be sent. I f durin g this pe riod the nod e receives an I-f ram e 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) DT E. The o the r en d of t h e co nnec tio n
must be the opposite of this port. Logical DCE/DTE is independent of physical. A
node connecting a subscriber device into a network should normal ly be confi gured as
logical DCE.
Lowest/Highest Inc oming/Two-Way/Outgoing C hannel
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 H ighest Incoming
Highest 2-Way Greater than/equal to Lowest 2-Way
Lowest Outgoing Greater than H ighest 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 f or either direction of data tr ansmission) on a per call b asis.
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 ne gotiation of the throughput classes for eithe r
direction of data transmission on a per call b asis. If N is selected, the default (Maximum
Throug hput C lass) will b e used. If Y is selected, any throughput clas s includ ed in a cal l
packet will be used. (If a class f or either direction is not included, its d efault value will
be used. )