Basic Telephone and Modem

interface 2 (BTMI-2)

Off-Premises Telephone

Interface (OPTI)

Hands-Free Unit (HFU)

I n d o o r bell

Extra alert strobe

General Purpose

Adapter (GPA)

In-Range Out- of-

Building Protectors (IROB)

Headset with Headset Adapter

Indoor horn

Indoor/outdoor alerter

Alerter accessories

FIGURE 1-8 A selection of MERLIN II system accessories.

1-32 System Hardware

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AT&T 518-600-016 manual A selection of Merlin II system accessories System Hardware