Modes Of Operation - AT&T MERLIN LEGEND Release 3.1 System Manager's Manual

Modes of Operation

Table 2–1. Modes of Operation
Key Mode
Description Telephones have
multiple buttons (or
keys ) labeled with
telephone numbers.
Every button
corresponds directly to
an outside line.
Different buttons
(ICOM buttons) are
used for inside calls.
Types of Trunks Ground-start
Loop-start
Tie
DS1 (T1 only)
BRI
Number of
Extensions:
Fewer than 50 Good
More than 50 Not recommended
Types of Buttons A line button for each
outside line. Up to 10
ICOM buttons for
inside calls.
User Access to Choosing a specific
Outside line button
Lines/Trunks
Types of Operator DLCs only
Console(s)
Recommended Smaller systems
Use (fewer than 50
extensions)
Hybrid/PBX Mode
Outside trunks are
grouped in pools for
shared use; the
system automatically
selects an available
outside trunk. People
use the same button
to make both inside
and outside calls.
Ground-start
Loop-start
Tie
DS1 (PRI and T1)
DID
BRI
Good
Good
Up to 10 SA buttons.
Pool button to access
a specific pool.
(Optional) A personal
line button for
dedicated use of a
specific outside trunk.
Dialing a code (usually
9) from an SA button
DLC, QCC, or a
combination of both
Medium to larger
systems (more than 50
extensions)
Behind Switch Mode
Used when the system
(called the local system ) is
connected to a larger PBX
or Centrex system (called
the host system ). One
outside line (a prime line )
is assigned to each
telephone. The host
system provides the
interface to outside lines
and some features.
Ground-start
Loop-start
Tie
Good
Good up to 80
For multiline phones:
multiple prime line
buttons. Up to 10 ICOM
buttons.
Dialing the host system's
dial-out code (usually 9)
from a prime line button
DLCs only
For users who are part of
a large organization, for
example, a department
within a company or
companies who subscribe
to Centrex services for
most features
Continued on next page
2–17
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