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1.2
System Highlights
System Capacity
Basic System
Expansion
Maximum Capacity When an optional ISDN line is used for CO lines:
Module Expansion
Expansion modules are used to increase the system capacity. The optional card,
KX-TD20880, supports one ISDN line, whose port can be selected to be used for a CO line
or extension line (Default: CO line).
Digital Proprietary Telephones (DPT)
By installing the optional card, KX-TD20870, the system can support up to four proprietary
telephones and four more single line telephones (max.). In this case, an XDP connection is
required. Refer to "EXtra Device Port (XDP)" on the next page. Six different models of
digital proprietary telephones, ranging from a monitor set to a large handsfree display
version, are available.
Account Management
Allows the user to manage the telephone charge by using certain features; such as Calling
with Account Codes and Referring to the Charges. For details, refer to each feature.
Automatic Route Selection (ARS)
Automatically selects the pre-programmed least expensive route for outgoing toll calls.
Data Line Security
Communication between the extension and other end is protected from any signal such as
Call Waiting, Hold Recall and Executive Busy Override.
Executive Busy Override
Allows the pre-assigned extension user to enter into an existing call to establish a three-
party conference.
Uniform Call Distribution (UCD)
Allows an incoming call to be distributed uniformly to a specific group of extensions.
Extension lines
ISDN line
ISDN line
Extension lines
CO lines
When an optional ISDN line is used for extension lines:
Extension lines
ISDN extension lines
CO lines
8
1 (2 CO lines)
1 (either for 8 extension lines
or 2 CO lines)
8
4
8
8
2
System Outline
1-3
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