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NT8D14 Universal Trunk card Page 593 of 894
Circuit Card Description and Installation
RAN modes of operation
Figure 136 on page 594 shows the relationship of control signals to message
playback for the operating modes available in announcement machines. The
signal names shown in Figure 136 are typical.
Note 1: For continuous operation mode, connect the trunk unit MB line
to the announcer B line only, and ground the announcer ST+ line. For
pulse start or level start modes, connect the trunk unit MB line to the
announcer ST+ line only, and leave the announcer B line unconnected.
Note 2: A maximum of 24 universal trunk card units can be paralleled
to a single announcer channel.
Multi-Channel RAN modes
In Multi-Channel RAN, multiple RAN channels can be configured within one
RAN trunk route. In a Multi-Channel RAN route, each trunk has its own
dedicated RAN channel on a physical RAN machine. Multi-Channel RAN
routes do not support the cross connecting (daisy chains) of multiple trunk
ports together so that several callers hear the same RAN message.
Multi-channel machine types – Continuous Mode Multi-Channel (MCON),
Pulse Start/Stop Multi-Channel (MPUL) and Level Start/Stop Multi-Channel
(MLVL) – are not linked to a RAN machine or a given trunk. All trunks
belonging to the RAN route are considered independent. RAN trunks and
RAN machine channels are connected one-to-one. If one RAN trunk is
detected as faulty, then all other trunks are not impacted.
For the RAN machine types, the maximum length of the recorded
announcement is two hours. The meaning of a ground signal received from
the RAN machine (play or idle) is configured in LD 16.
Multi-Channel Level Start/Control Mode (minimum vintage BA)
A RAN mode of operation is available called “Multi-Channel Level Start/
Control Mode.” This mode enables provisioning of multiple RAN channels
for a RAN route (playing the same message independently on demand)
cross-connected one-to-one to each RAN trunk in a multi-channel level start
RAN route. Do not bridge RAN trunks in a multi-channel RAN route.