Nortel Circuit Card Installation Manual page 606

Page 606 of 906
Figure 139
RAN control signals (Control GRD = IDLE)
Ground
ST+
Open
Play
Message
Idle
Ground
C
Open
Ground
ST+
Open
Play
Message
Idle
Ground
C
Open
250 ms pulse at
start of message
(early disconnect)
Ground
ST+
Open
Play
Message
Idle
Ground
C
Open
553-3001-211 Standard 3.00
NT8D14 Universal Trunk card
ST+ input to announcer hardwired to ground
250 ms pulse at
end of message
— Continuous operation mode —
250 ms pulse
starts message
Start
Message plays
to completion
— Pulse start/Level control mode —
The Route Data Block LD 16 is used to configure a RAN route in
Multi-Channel Level Start/Control mode, using the following response:
RTYP = MLSS
August 2005
250 ms reset
End
250 ms pulse at
end of message
(disconnect after end of message)
ST+ initiates and maintains
message output
Message output only
while ST+ is present
250 ms pulse at
start of message
Intermediate ST+
pulses ignored
250 ms pulse at
end of message