Nortel Meridian 1 Manual page 29

Control Pulse
from RAN machine
Start Pulse
from Meridian-1
Intelligent peripheral equipment circuit cards for New Zealand
Figure 1
Recorded announcement—start mode
150 ms
Continuous mode
The requirements for continuous mode announcement machines are as
follows:
• an impedance of 4 ohms or less
• generation of a control pulse (150 - 300 ms) at the start of the
announcement period
• default signal level of -9 dBm (in 600Ω) adjustable to a level of 10
dBm.
The announcement machine may provide a separate busy signal when the
machine is recording, erasing a message, or if the machine is malfunctioning.
The busy signal will be used by the Option 11 for maintenance purposes.
Figure 2 shows recorded announcement in continuous mode.
E&M tie trunk circuit card
Announcement Duration
Page 25 of 44
GND
Open
GND
Open
Option 11 - Description and Instal-