AT&T 3.0 manual Single-Line Telephones, Unsupported Telephones and Adjuncts Model

Installing Adjuncts

■MTR Interface (MTRI)

■Off-Premises Extension Unit (OPX)

■System 25 Direct Extension Selector (DXS)

See Table 3-1 for additional notes on unsupported telephones and adjuncts.

Table 3–1. Unsupported Telephones and Adjuncts

Model	Notes
51013 Personal Terminals	Digital Communications Protocol (DCP)
DCP telephones	7400 telephones and adjuncts (asynchronous data units
	and multiple asynchronous data units) that use DCP and
	are supported on the MERLIN II Communications System
MET telephones	Multibutton electronic telephones (METs) and adjuncts
	used with the Dimension PBX and Horizon systems
Single-line telephones (with	Message light does not work.
neon message-waiting lights)
Analog telephone adjuncts	Basic telephone modem interface (BTMI); BTMI-2; off-
	premises extension (OPX) unit; System 25 Direct
	Extension Selector (DXS); DSS attached to a 34-button
	Deluxe membrane

Single-Line Telephones

Releases prior to Release 3.0 system support the single-line telephones listed in Table 3–2.

3-40Installing Telephones and Adjuncts