AT&T 518-600-016 Size, type, and features of a Merlin II system are, For administration purposes

SYSTEM	The size, type, and features of a MERLIN II system are
CONFIGURATION	determined using system planning forms.
System Size	A MERLIN II system can be as small as four outside lines
	and eight analog voice terminals, or as large as 56 outside
	lines and 72 stations. A MERLIN II system with as many
	as eight lines and 20 stations is considered a small system
	for administration purposes.
	Basic and expanded system capabilities are determined by
	these system hardware maximum limitations:
	● Thirty-six analog stations with the Simultaneous Voice
	and Data feature
	● Sixty-four digital stations with the Simultaneous Voice
	and Data feature
	● Eleven line pools
	● Seventy-one off-premises devices or Basic Telephone
	and Modem Interfaces
System Type	A system can be configured for pooled, square, or behind-
	switch operation. The MERLIN II system default
	configuration is pooled with button access.
	● In a square system, each outside line has a dedicated
	position on a voice terminal. This arrangement is also
	known as a key system. In a standard square
	configuration, outside lines appear on the same buttons
	on each voice terminal. In a customized square
	system, different groups of outside lines are assigned
	to the same buttons on selected groups of voice
	terminals.

1-4 System Overview