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In a pooled system, outside lines can be grouped into
line pools (groups of interchangeable lines). To get an
outside line in a pooled system, the user must dial an
access number or use a dedicated pool button on the
voice terminal. Access to outside line pools can also
be had through Automatic Route Selection (ARS).
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In a behind-switch system, the MERLIN II system
operates behind a larger system such as a System 25,
75, or 85 PBX. In this configuration, most features of
both systems are available to the MERLIN II system
user. Refer to Figure 1-2 for an example of a MERLIN
II system operating behind a digital PBX.
System Overview 1-5