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Q.921/Q.931 Timers
November 2009 334
If layer 2 has been enabled, you will receive the data (termed
payload) you expect with the layer 2 headers stripped off and all the
data reliability checks already performed. If layer 2 has not been
enabled, you will receive intact layer 2 packets, which will contain
the payload. These packets will need to be processed, and a layer 2
stack will have to be implemented all the while extracting the
payload.
HDLC packetization does not need to be enabled, instead you can
choose the raw mode option. To do this, both HDLC headers will
need to be either stripped off or recognized, and the layer 2 packet
headers inside the HDLC headers to get to the payload.
unsigned
short
t318 Q.931 Resume Request state timer. Default value
is 1200 (120 seconds).
unsigned
short
t319 Q.931 Suspend Request state timer. Default value
is 1200 (120 seconds).
unsigned
short
t3m1 Q.931 Maintenance SERVICE ACK timer. Default
value is 1200 (120 seconds). Default value must be
used for NFAS configurations.
unsigned
short
t321 Q.931 NFAS D-channel backup timer. Default
value is 400 (40 seconds).
Table 16. Q.931 Timers (Level 3 Parameters) (Continued)
Data Type Mnemonic Definition