Instruction manual

HARDWARE DESCRIPTION
— CPU/MEM CP: Green status LED only. “Off” for several seconds during power up and
test, then lamp flashes to indicate an “OK” state. Steady “Off” or “On” indicates a
problem.
— System Resource CPs:
Service Circuit CP - Similar to port CPs except yellow LED flashes to show system
clock is active and is steadily “On” when a tone receiver is in use. “Off” indicates a
problem.
Modem Pool and Tone Detector CPs - Same as Port CPs.
Terminal Equipment
Terminal equipment is connected to System 25 station (voice or data) ports. It is made up of the
following groups:
● Voice Terminals
— Single-Line
— Multiline (MERLIN
®
Communications System sets and MET sets)
— Multiline ATL cordless telephones
● Voice Terminal Adjuncts
● Attendant Consoles
● Asynchronous Data Units (for interface with data terminals).
This subsection provides information on all components in each group or contains references to the
Section where information can be found.
Voice Terminals
System 25 supports a wide range of voice terminals, including industry standard touch-tone single-
line telephone sets, MERLIN System multiline sets, and ATL cordless telephones.
In addition to providing basic telephone service (placing and answering calls), voice terminals can
also be used to activate many system features. The voice terminals supported by System 25 are
listed in Table 4-D and described in individual subsections.
4-14
November 1995