Panasonic KX-TD500 System Reference Manual page 273

9.00 Parallel Connection of
Extensions
Description
Any Single Line Telephone can be connected
parallely with a PITS telephone.
When parallel connection is made, an extension
user can make and answer a call by using either of
both telephones.
However, the operation of parallely connected
Single Line Telephone is somewhat restricted as
follows:
Features not available are:
• Speed Dialing-System/Station
• Hold, Hold Retrieve
• Pickup Dialing
• Account Code Entry
• Message Set
• Conference
• Walking Station
• Timed Reminder
• Call Waiting
Cannot make a call when parallely connected PITS
telephone is:
• In the BGM mode
• Being paged through built-in speaker
• In the PITS programming mode
Will not ring and cannot answer a call when the
PITS telephone is :
• In the Automatic Answer mode
• In the Voice Alerting mode
To make parallel connection effective, assign
"Extension-Station", Parallel Connect to "Yes" at
parallely connected PITS telephone side.
Parallel connection of APITS
DHLC Card
HLC Card
H
T
Port 1
R
L
and SLT
APITS
SLT
3-F-13
Parallel connection of DPITS and SLT
DHLC Card
H
T
Port 1
R
L
Programming
System Programming
"Extension-Station (1/4)",
Parallel Connect
Conditions
Not only a Single Line Telephone but an
answering machine, a facsimile, or a modem
(personal computer) can be connected parallely
with certain PITS telephones.
The parallel connection of a Single Line
Telephone and a PITS telephone becomes
available under the following conditions.
— Parallely connected PITS telephones are
interfaced with HLC and DHLC card.
— The number of Single Line Telephones which
can be connected parallely with PITS
telephones must be within 48 lines per shelf.
When a SLT is connected parallely, the power
failure transfer (PFT) feature does not work for
the SLT.
In the SLT and DPITS combination, if one
telephone goes off-hook while the other telephone
is on a call, the call is switched to the former.
In the SLT and APITS combination, if one
telephone goes off-hook while the other telephone
is on a call, a three-party call is established. If
one user goes on-hook, the other user continues
the call.
DPITS
SLT
Reference
VT Dumb
10-G-1.01 11-C-24.00