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Loop Start Signaling
November 2009 305
Figure 39. FXO Loop Start – Incoming Call Timing Diagram
IISDN SMI MESSAGES: L4L3mALERTING_REQUEST or L4L3mPROGRESS_REQUEST L4L3mCONNECT_REQUEST
L3L4mPRE_SEIZE L3L4mSETUP_IND
IISDN TIMERS:
hooktimer_onhook_rls
modified_in_rls_time
r
hooktimer_onhk_mod_in_rls
critical_time
r
hooktimer_maxmake
hooktimer_minmake
hooktimer_maxbrea
k
hooktimer_minbreak
first_indigit_timer
dptimer_immed_dela
y
hooktimer_offhook_inseize
RECEIVE HOOKSWITCH, FXS:
A
Bi
t
B Bit
TRANSMIT HOOKSWITCH, FXO:
A
Bi
t
B Bit
NOTE: This diagram is designed to give the reader a general understanding of the sequence of events for this robbed
bit protocol over time. The timers and spacing on this graph are not proportional to the actual events that occur.
Revised 10-Nov-98
Revision 1.3
DP Digit "2" DP Digit "1"
RECEIVED BITS,
TRANSMITTED
Revised