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Ground Start Signaling
November 2009 293
Figure 32. FXO Ground Start – Outgoing Call Timing Diagram
IISDN SMI MESSAGES: L4L3mCALL_REQUEST
L3L4mPROGRESS L3L4mSEIZE_COMP L3L4mCONNECT
IISDN TIMERS:
fake_answer_time
r
hooktimer_offhook_answe
r
hooktimer_onhk_mod_out_rls
fixed_pause_time
r
RECEIVE HOOKSWITCH, FXS:
A Bit
B Bit
TRANSMIT HOOKSWITCH, FXO:
NOTE: No digits are collected on the far end in this mode.
A Bit
B Bit (ignored)
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
RECEIVED BITS,
TRANSMITTED
Revised
20-Oct-03
Rev 1.4