Features Description - Nortel Meridian 1 Manual

Page 26 of 44 E&M tie trunk circuit card
Control Pulse
from RAN machine
Busy Signal
from RAN machine
Paging trunk operation

Features description

Inverted dialling
Supplement to 553-3011-210
Figure 2
Recorded announcement—continuous mode
Announcement Duration
Music source
The music source should provide an impedance of 600 Ω. The default
signalling level should be -9 dBm (in 600Ω) adjustable to a level of 10 dBm.
When used in the paging mode, the trunk circuit is connected to a
customer-provided paging amplifier system. When accessed, the card
provides a loop closure. In a typical application, the loop closure will cut off
a music supply and switch the paging trunk transmission path to the paging
amplifier.
In New Zealand, digipulse signalling follows a "10-n" system, where n
represents the digit dialed. Inverted dialling is illustrated in Table 17
Provisional 1.3
150-300 ms
GND (Make Busy)
Open (Normal)
July 1993
GND
Open