Avaya Nortel Communication Server 1000 Reference page 387

Figure 106: Loop start call connection sequence - incoming call from CO/FX/WATS
Outgoing calls
For outgoing calls, the software sends an outgoing seizure message to place a low-resistance
loop across the tip and ring leads toward the CO. See
incoming call from CO/FX/WATS
sequence - incoming call from CO/FX/WATS
resistance loop, it prepares to receive digits. When the CO is ready to receive digits, it returns
a dial tone. Outward address signaling is then applied from the system in the form of loop
(interrupting) dial pulses or DTMF tones.
Circuit Card Reference
Figure 107: Ground start call states -
on page 388 and Figure 108: Ground start call connection
on page 389. When the CO detects the low-
Operation
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