Nortel Networks 1000 User Manual
Page 590
590
NT8D14 Universal Trunk card
"RAN control signals (Control GRD = IDLE)" (page 586)
. At the end of
each message, a pulse is issued on the "C" line that is used by the trunk
unit to cut through to the waiting call.
Note:
The "B" (busy) signal line indicates availability of an
announcement machine message to the trunk unit when configured for
the continuous operation mode. This signal is made active (ground) by
the announcement machine if the channel contains a recorded message
and is in an online condition. The "B" line is not connected to a trunk
unit when configured for start mode operation.
Start modes (minimum vintage BA)
In a start mode (sometimes called
the Code-a-Phone or start-stop mode), playback of a message does not
begin until a start pulse is received by the announcement machine. Two
subcategories of the start mode exist: pulse start and level start.
In the pulse start mode, a start pulse activates playback of a message that
continues until completion. The announcement machine ignores all other
start pulses that might occur until the message is complete.
In the level start mode, the start signal is a "level" rather than a pulse. The
leading edge of the start signal initiates message playback that continues
until either the trailing edge of the start signal occurs or the end of the
message is reached. A message that is terminated by the trailing edge of
a level start signal is immediately reset and ready for playback again.
In a start mode (sometimes called the Code-a-Phone or start-stop mode),
playback of a message does not begin until a start pulse is received by the
announcement machine. Two subcategories of the start mode exist: pulse
start and level start.
In the pulse start mode, a start pulse activates playback of a message that
continues until completion. See
Figure 197 "RAN control signals (Control
. The announcement machine ignores all other
start pulses that might occur until the message is complete.
In the level start mode, the start signal is a "level" rather than a pulse. The
leading edge of the start signal initiates message playback that continues
until either the trailing edge of the start signal occurs or the end of the
message is reached. A message that is terminated by the trailing edge of
a level start signal is immediately reset and ready for playback again.
In a start mode (sometimes called the Code-a-Phone or start-stop mode),
playback of a message does not begin until a start pulse is received by the
announcement machine. Two subcategories of the start mode exist: pulse
start and level start.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.