Nortel Meridian 1 Manual page 27

Table 16
Summary of NT5K19BA DC-5 signalling states
Signal
Idle
Seize
Hold
Delay dialling
(optional)
Proceed to send
(optional)
Digit Pulse
Answer
Far End Release
Near End Release
Recorded Announcement/Music trunk operation
Intelligent peripheral equipment circuit cards for New Zealand
Call disconnect
Either party can disconnect the call by applying a clear signal to the M wire.
The far end applies a "clear back" signal, while the near end applies a "clear
forward" signal. The circuit remains busy until both clear forward and clear
backward signals have been exchanged.
Table 9 provides a summary of NT5K19BA DC-5 signalling states.
Outgoing PBX sending
condition — M Wire
Earth-Off
Earth-On
Continuation of seize signal
—
—
Earth-Off pulses in step with dial
pulses
—
Earth-Off for longer than 300
milliseconds
—
When used in the Recorded Announcement/Music mode, the trunk circuit is
connected to a customer provided recorded announcement machine or a
music source.
E&M tie trunk circuit card
Incoming PBX sending
condition — M Wire
Earth-Off
—
—
Earth-On
Earth-Off
—
Earth-On
—
Earth-Off for longer than 300
milliseconds
Option 11 - Description and Instal-
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