AT&T MERLIN LEGEND Release 2.0 System Programming Manual page 292

Programming Procedures
Timers and Counters
Use this procedure to set timer and counter thresholds.
C A U T I O N :
The factory settings for these thresholds are standard and rarely need
to be changed.
If you are not sure of the correct timer and threshold settings for your
PRI lines and trunks, check with your authorized support representative
before you make a change.
Incorrect settings can cause your PRI lines and trunks to malfunction.
When no response is received from the network before the programmed setting,
the system takes the appropriate corrective action.
The timers and counters are the following:
T200 Timer – times the delay in the link layer acknowledgement of a
message sent from the system to the network over a D-channel.
T203 Timer - times the interval between each exchange of messages
between the system and the network on the D-channel
N200 Counter - counts the number of times the system has transmitted a
message on a D-channel because no link layer acknowledgement is
received from the network
N201 Counter - counts the maximum number of layer 3 octets the
system can send or receive in a single D-channel message
K Counter – counts the number of layer 3 unacknowledged messages
sent from the system to the network on a D-channel
T303 Timer - times the delay in network response when the system
sends a setup message to initiate an outgoing call
T305 Timer – times the delay in network response when the system
sends a disconnect message to clear a call
T308 Timer – times the delay in network response when the system
sends a release message to clear a call
T309 Timer - times the duration of a D-channel data link failure (a loss of
signaling for the entire PRI connection)
T310 Timer - times the network delay following the receipt of a call
proceeding message on an outgoing call
T313 Timer – times the delay in network response when the system
sends a connect message that indicates the completion of an incoming
call
Timers and Counters
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