Loop Start Signaling
November 2009 306
Figure 40. FXO Loop Start – Outgoing Call Timing Diagram
IISDN SMI MESSAGES: L4L3mCALL_REQUEST
L3L4mPROGRESS L3L4mCONNECT
IISDN TIMERS:
modified_out_rls_time
r
hooktimer_onhk_mod_out_rls
no_ringing_time
r
ringing_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
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
TRANSMITTED RECEIVED BITS, Revised