Nortel Networks 553-3001-211 manual RAN control signals Control GRD = Idle, St+

Page 594 of 894 NT8D14 Universal Trunk card

Figure 136

RAN control signals (Control GRD = IDLE)

Ground

ST+

Open

Play

Message

Idle

Ground

C

Open

ST+ input to announcer hardwired to ground

250 ms reset

250 ms pulse at end of message

— Continuous operation mode —

Ground			250 ms pulse
ST+
			starts message
Open
Play
Message		Start Message plays		End
Idle			to completion
Ground
C
Open	250 ms pulse at			250 ms pulse at
	start of message			end of message

Intermediate ST+ pulses ignored

— Pulse start/Level control mode —

	(early disconnect)	(disconnect after end of message)
Ground		ST+ initiates and maintains
ST+
Open			message output
Play
Message			Message output only
Idle			while ST+ is present
Ground
C
Open		250 ms pulse at		250 ms pulse at
		start of message		end of message

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

553-3001-211 Standard 2.00 September 2004