AT&T feature module 2 system manual Control Unit Modules, Only 82 responding stations

Control Unit Modules

DESCRIPTION	The basic carrier contains slots for up to seven modules, which supply power,
	direct system operation, and provide jack connections for telephone lines,
	voice terminals, and other equipment, such as a tape player for the Music-
	on-Hold feature. See Figure 2-19. You can also add to your system one
	expansion carrier which provides more power and additional connections for
	lines and equipment. Your MERLIN II system may include up to 56 outside
	lines and as many as 88 connections for voice terminals or other equipment,
	depending on the combination of modules installed. However, you can have
	only 82 responding stations.
	FIGURE 2-19 The MERLIN II system control unit with installed modules.

The following modules are used in the MERLIN II system:

●Power Supply Module. A Power Supply Module, which supplies power to the other modules in the unit, always occupies the leftmost slot on the basic carrier and the expansion carrier. There is an Off/On switch at the bottom of the module. When the power is on, a green light is on next to the switch.

Accessory Equipment 2-175