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Q.921/Q.931 Timers
November 2009 333
unsigned
short
n200 Maximum number of retransmissions. Default
value is 3.
unsigned
short
n201 Maximum number of octets in an I frame.
Currently the maximum is 240.
unsigned
short
n202 Maximum number of transmissions of a TEI
request message. Default value is 3.
unsigned
short
K Maximum transmit window. Default value is 7;
maximum value is
127. BRI default is 1.
Table 15. Q.921 Timers (Level 2 Parameters) (Continued)
Data Type Mnemonic Definition
Table 16. Q.931 Timers (Level 3 Parameters)
Data Type Mnemonic Definition
IISDN_Q931_
TIMERS
q931 Structure that includes changes to the Q.931 timer
values, if any. A value of 0xFFFF disables the
timer. Setting a field to 0 causes the default to be
used. Some timers have two possible default
values depending on the connection type/variant
used. For example, if the variant field value is
IISDNvarCCITT in an L4L3mENABLE_
PROTOCOL message, or the conn_type field
contains an IISDNctCCITT value in an
L4L3mENABLE_D_CHANNEL message, the
CCITT default value below is used. For all other
connection type or variant values, the standard
default value is used.
unsigned
short
t302 Q.931 Overlap Receiving timer. Default value is
150 (15 seconds).
unsigned
short
t305 Q.931 Disconnect Request state timer. Default
value is 50 (5 seconds) and the ITU-T default value
is 300 (30 seconds).
unsigned
short
t308 Q.931 Release Request state timer. Standard
default value is 50 (5 seconds) and the ITU-T
default value is 40 (40 seconds).
unsigned
short
t313 Q.931 Connect Request state timer. Default value
is 50 (5 seconds) and the ITU-T default value is 40
(4 seconds).
unsigned
short
t314 Q.931 Segment message time. Default value is 40
(4 seconds).
unsigned
short
t316 Q.931 Restart Request state timer. Default value is
1200 (120 seconds).