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Ground Start Signaling
November 2009 299
Figure 36. FXS Ground Start – Outgoing Call Timing Diagram
IISDN SMI MESSAGES: L4L3mCALL_REQUEST
L3L4mPROGRESS L3L4mSEIZE_COMP L3L4mCONNECT
IISDN TIMERS:
answer_time
r
hooktimer_offhook_answe
r
hooktimer_onhk_mod_out_rls
dptimer_end_dial_pause
dptimer_interdigit
dptimer_make
dptimer_break
fixed_pause_timer
hooktimer_onhk_mod_out_rls
glare_detection_time
r
RECEIVE HOOKSWITCH, FXO:
A
Bit
B Bit (ignored)
TRANSMIT HOOKSWITCH, FXS:
A Bi
t
B Bi
t
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
TRANSMITTED
Revised