Nortel Networks 553-3001-211 manual RAN modes of operation, Multi-Channel RAN modes

NT8D14 Universal Trunk card Page 593 of 894

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.

Circuit Card Description and Installation