AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 32

Introduction
8110 (desk telephone, built-in speakerphone with volume control,
auxiliary power jack for improving quality of built-in speakerphone, Mute
button with LED indicator, and data jack for connecting a modem)
500MM, 554BMPA, 500SM (rotary dial)
*
Vintage telephone; no longer available for sale or lease
Adjuncts
Adjuncts are pieces of equipment that connect directly to the control unit or to a
telephone through an adapter (see Adapters). Answering machines, credit
card verification terminals, and alerts are examples of adjuncts.
Adapters
Adapters enable the connection of equipment or, in the case of a channel
service unit (CSU), of Digital Signal 1 (DS1 ) facilities to the control unit. Some
adapters connect directly to the control unit (system adapters) while others
connect to telephones (telephone adapters).
System adapters
— ESF T1 CSU
— 551 T1 L1 CSU
— Universal Paging Access Module (UPAM)
— Loop trunk adapter for paging
Telephone adapters
— Multi-Function Module (MFM) for MLX telephones
— General Purpose Adapter (GPA) for analog multiline telephones
— 7500B Data Module for connecting digital data equipment
1-4 Components
WARNING:
The MFM can be installed or repaired only by a
qualified technician or an authorized dealer
representative. To eliminate the risk of electrical shock,
the MLX telephone should not be disassembled.
7500B Data Module for connecting digital data equipment either
directly to the control unit or to an
simultaneous voice and data transmission)
modem for connecting digital equipment (such as a personal
computer) to a tip/ring (T/R) interface
MLX (for
telephone