Meridian Nortel 1 Option 11C Technical Reference Manual page 430

Page 430 of 544
Table 134
Call connection sequence—near-end station receiving call
State
Line card unit idle
Incoming call
Near-end station
off-hook
Two-way voice
connection
Near end station
hangs up first
Line card unit idle
Far end station
hangs up first
Line card unit idle
553-3011-100 Standard 14.00
NT1R20 Off Premise Station (OPS) analog line card
Signal/Direction
Far-endNear-end
Group on tip, battery on ring
High resistance loop
Ringing
Low resistance loop
High-resistance loop
Group on tip, battery on ring
High resistance loop
High resistance loop
Ground on tip/battery on ring
High resistance loop
January 2002
Remarks
No battery current drawn.
Far-end station goes off-hook and
addresses (dials-up) the near-end
station. The Option 11C receives the
incoming call on a trunk and determines
the TN.
Option 11C applies 20 Hz ringing to ring
lead.
Option 11C detects increase in loop
current, tips ringing, and puts call through
to near-end station.
If near end station hangs-up first, the line
card detects the drop in loop current.
Line card unit is ready for the next call.
If the far-end hangs-up first, Option 11C
detects disconnect signalling from the
trunk. The person at the near-end
recognizes the end of the call and hangs-
up.
Line card unit is ready for the next call.