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MERLIN LEGEND Communications System Release 5.0	Issue 1
System Manager’s Guide 555-650-118	June 1997
2 About the System
Modes of Operation	Page 2-17

Table 2–1. Modes of Operation

	Key Mode	Hybrid/PBX Mode	Behind Switch Mode
Description	Telephones have multiple	Outside trunks are	Used when the system
	buttons (or keys) labeled	grouped in pools for	(called the local system) is
	with telephone numbers.	shared use; the system	connected to a larger PBX
	Every button corresponds	automatically selects an	or Centrex system (called
	directly to an outside line.	available outside trunk.	the host system). One
	Different buttons (ICOM	People use the same	outside line (a prime line)
	buttons) are used for	button to make both	is assigned to each
	inside calls.	inside and outside calls.	telephone. The host
			system provides the
			interface to outside lines
			and some features.
Types of Trunks	Ground-start	Ground-start	Ground-start
	Loop-start	Loop-start	Loop-start
	Tie	Tie	Tie
	DS1 (T1 only)	DS1 (PRI and T1)
	BRI	DID
		BRI
Number of
Extensions:
Fewer than 50	Good	Good	Good
More than 50	Not recommended	Good	Good up to 80
Types of Buttons	A line button for each	Up to 10 SA buttons.	For multiline phones:
	outside line.
	Up to 10 ICOM buttons for	Pool button to access a	Multiple prime line buttons.
	inside calls.	specific pool. (Optional) A	Up to 10 ICOM buttons.
		personal line button for
		dedicated use of a
		specific outside trunk.
User Access to	Choosing a specific line	Dialing a code (usually 9)	Dialing the host system’s
Outside	button	from an SA button	dial-out code (usually 9)
Lines/Trunks			from a prime line button
Types of Operator	DLCs only	DLC, QCC, or a	DLCs only
Console(s)		combination of both
Recommended	Smaller systems (fewer	Medium to larger systems	For users who are part of a
Use	than 50 extensions)	(more than 50 extensions)	large organization, for
			example, a department
			within a company or
			companies which
			subscribe to Centrex
			services for most features

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