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Basic Telephone and Modem
interface 2 (BTMI-2)
General Purpose
Adapter (GPA)
Off-Premises Telephone
Interface (OPTI)
Hands-Free Unit (HFU)
Indoor
bell
Extra alert
strobe
In-Range Out- of-
Building Protectors (IROB)
Headset with Headset Adapter
Alerter accessories
Indoor
horn
Indoor/outdoor
alerter
FIGURE 1-8 A selection of MERLIN II system accessories.
1-32 System Hardware