Alpha Communications STR QwikBus Assembly instructions

STR QwikBus™
2 wire Color Video
Intercom System
(with TT33, VSP333-2 and KMB3-AM)
Installation, Programming, and
User’s Manual
Copyright©2007-2013, Alpha Communications®, All Rights Reserved AWD121
Rev. 1.3 09/2008

b
STR QwikBus™ 2 wire Color Video Intercom System
Introduction 1
Compatible Inside Stations 1
Planning the Installation 2
Wiring Diagrams
Single Entry STR Modular Panel 4
Multiple Entry STR Modular Panels 5
Single Entry Custom Panel 6
Multiple Entry Custom Panels 7
Important Notes on Monitor Riser Connections 8
EVB33 Distribution Units 9
Dipswitch Settings 10
System Camera Options – Lobby Panels, and Observation 11
End of Line Resistors Jumper Locations 12
The Matrix – Wiring Custom Panel Buttons to the TT33 13
E56 E88 E120 Matrix Extenders 13
The IC2 database chip 14
Opening and Closing the VFS1500/1000 VH3033 Inside Stations 14
Programming the QwikBus™ System -- Open Voice (VFS1500/1000) 15
Programming (on site) 15
Programming Inside Stations for parallel operation 15
One Man Bench Programming 16
Programming VFS1500 stations for Intercommunication 17
Programming the QwikBus™ System --Handset (VHC3033-2) 18
Programming (on site) 18
Programming Inside Stations for parallel operation 18
One Man Bench Programming 19
USER Operation
VHC3033-2 Color Handset 20
VFS1500/ VFS1000 Monitors & FS1500/FS1000 Audio Stations 21

1
The STR QwikBus™ takes advantage of the latest in digital technology to provide a high
tech, high quality color video intercom system operating on a 2 common wire BUS.
QwikBus™ video monitor stations all feature a crystal clear 4" LCD Color screen (measured
diagonally) and can be surface or flush mounted (with optional UMV1000 flush housing). You
can choose from the VFS1000 series (hands free VOX without internal communications) or
the VFS1500 series hands free VOX (with internal communications for up to 5 units per apt.),
as well as handset style monitors and audio only stations all on the same 2 twisted
wires. Audio only stations are available as well and can be mixed and matched to suit your
particular application.
QwikBUS™ COMPATIBLE INSIDE STATIONS
FS1500
AUDIO STATION
Voice Operated Hands free
Available in 6 Designer
Finishes
Crystal Clear Digital Sound
Internal Communications
Capable
VFS1000
COLOR MONITOR
Voice Operated hands free
Available in 6 Designer
Finishes
VFS1500
COLOR MONITOR
Voice Operated hands free
Available in 6 Designer
Finishes
Communicate internally
between up to 5 stations per
a
p
artment.
FS1000
AUDIO STATION
Voice Operated Hands free
Available in 6 Designer
Finishes
Crystal Clear Digital Sound
VHC3033-2
COLOR
MONITOR
W/HANDSET
Available in White,
Titanium, and
Anthracite
HT3033
AUDIO HANDSET
Available in White,
Titanium, and Anthracite

2
PLANNING THE INSTALLATION
Is this a COLOR Video installation?
This manual is written expressly for the QwikBus™ 2-wire Color systems that will be
using the Inside monitors listed on the previous page. If you are installing a Black and White
system please refer to the QwikBus™ 4-wire Black & White Manual.
How many apartments?
QwikBus™ can run up to 120 apartments and can exceed that number if specially
designed. If you will be installing a larger system please contact Alpha Communications® for
assistance.
How many apartments will need more than 1 monitor?
An apartment can have up to 5 monitors and or audio stations that will ring when the
entry button is pressed.
Will these multiple monitor apartments need intercommunication?
Intercommunication is only available using the VFS1500/ FS1500 series stations which
allow you to ring 2-4 other stations in the apartment depending on the equipment used.
How many Entrances?
QwikBus™ can have up to 8 Entrance panels. If you will be installing a larger number of
entrances please contact Alpha Communications® for design assistance.
Modular Panel?
STR modular panels are available in White, Titanium, and Dark Brown and are usually
used in small installations from a 1 button residential application up to multi-apartment
configurations and feature beautiful contemporary looks, illuminated buttons, and outside
weather resistance.
Stainless Steel or Brass Panel?
Alpha Communications can custom design and build flush and surface mount entry
panels in Stainless Steel or Polished Brass with all necessary apartment button numbering
and address engraving.
How many observation cameras will be in the system?
Additional Cameras can be added in addition to the Entrance Cameras for a total of 8,
enabling the apartment monitors to view the various feeds on demand.
What type of Inside stations will you use?
Although all the compatible stations connect the same way, each model does have
certain capabilities and advantages depending on the needs of the tenant and can be
exchanged for another unit at anytime if necessary by simply installing the 2 wires and
reprogramming the system to recognize the unit.

3
Are you running new wire or using existing wire from a previous system?
Although digital systems are fairly forgiving in wiring requirements, they are still
susceptible to RFI from unusually strong nearby transmitters, EMI from electrical lines
running nearby, or existing wiring that is not twisted, in poor condition, or not a suitable
gauge. Please refer to the wiring thickness chart below to determine the minimum
recommended wire gauge needed. If the existing wiring is more than 12 years old, has
deteriorating insulation, questionable splice connections, corrosion, or is not configured as
twisted pair wiring, it is highly recommended that new wire be run.
To reduce the risk of interference problems:
Always use a single twisted pair wire for the two wire BUS line.
Do NOT double wires to increase effective wire diameter. This will cause interference
problems.
Do NOT install any unused additional wires with open ends.
Never connect the shield from a cable, or connect the shield from one cable to
another.
Use a separate cable to the door strike from the SP333.
Only use a 12VAC door strike or 12VAC relay with less than 1 amp draw.
If it is absolutely necessary to run the door strike wiring in the same cable as the BUS
line, you must use a transient voltage suppressor at the door strike end.
Loop resistance should be less than 20 ohms.
Twisted pair is always recommended.
Cat5, Cat5E, Cat6, and the new Cat7 spec. wire is NOT recommended.
How many risers will you be using?
The recommended maximum number of monitors on a riser is 10 with each riser originating
from the VSP333-2 Control Unit, including from the EVB333 Amplified Splitter(s) if your
system requires them.
For technical assistance and help determining equipment needed please call:
Alpha Communications® at [phone] Monday – Friday 8:30- 5:00 pm

4
System Notes – 2 wire COLOR with Single Modular Entry
A Single Entry Modular system requires the following dipswitch settings on the back of the
TSMB3 unit:
Switches 4, 5, & 6 identify the entrance number (all OFF = Entrance 1)
Switch 3 If the door strike is to be connected to the SP333 (Tö1) = OFF
If the door strike is to be connected to the TSMB3 (Tö) = ON
For more information refer to Page 10 - Dipswitch Settings.
Be sure that the End of Line Jumpers are used on the camera circuit board and in the last
monitor on each riser. If the last unit on a riser is an audio only unit, the End of Line Jumper
would still be used on the last monitor on that riser. This is important for best picture quality.
For more information refer to Page 12 - End of Line Jumper Locations.
When connecting C333-2 harness between SP333 and SNT333, ALWAYS observe 24VDC Polarity.

5
System Notes – 2 wire COLOR with Multiple Modular Entries
Multiple Entry Modular systems require the following dipswitch settings on the back of the
TSMB3 unit:
Switches 4,5, &6 identify the entrance number. In the above example:
Entrance #1 = 4 OFF/ 5 OFF/ 6 OFF Entrance #2 = 4 ON / 5 OFF/ 6 OFF
Switch 3 If the door strike is connected to the SP333 (Tö2) = OFF (as shown at Entrance 2)
If the door strike is connected to the TSMB3 (Tö) = ON (as shown at Entrance 1)
For more information refer to Page 10 - Dipswitch Settings.
Be sure that the End of Line Jumpers are used on the camera circuit board and in the last
monitor on each riser. If the last unit on a riser is an audio only unit, the End of Line Jumper
would still be used on the last monitor on that riser. This is important for best picture quality.
For more information refer to Page 12 - End of Line Jumper Locations.
When connecting C333-2 harness between SP333 and SNT333, ALWAYS observe 24VDC Polarity.

6
System Notes – 2 wire COLOR with Single Custom Panel Entry
The TT33 SPEAKER/MICROPHONE/ CONTROLLER allows you to use QwikBus™ with a
custom panel or existing dry contact type entry panel by converting the button presses to a
digital signal through an electronic matrix. This matrix is discussed in detail on Page 13.
A Single Panel Entry system requires the following dipswitch settings on the TT33 unit:
Switches 4, 5, & 6 identify the entrance number (all OFF = Entrance 1)
Switch 3 If the door strike is to be connected to the SP333 (Tö1) = OFF
If the door strike is to be connected to the TT33 (Tö) = ON
For more information refer to Page 10 - Dipswitch Settings.
Be sure that the End of Line Jumpers are used on the camera circuit board and in the last
monitor on each riser. If the last unit on a riser is an audio only unit, the End of Line Jumper
would still be used on the last monitor on that riser. This is important for best picture quality.
For more information refer to Page 12 - End of Line Jumper Locations.
NOTE: When using a Coaxial cable into a KBS3-2, ALWAYS connect a 75Ω( for RG-59) or
50 Ω(for RG-6) End-of-Line resistor between the coax center lead terminal and the (-)
terminal on the KBS3-2. Failure to do this may cause degradation of the video signal.
When connectin
g
C333-2 harness between SP333 and SNT333, ALWAYS observe 24VDC Polarit
y
.

7
System Notes – 2 wire COLOR with Multiple Custom Panel Entries
Multiple Custom Panel Entry systems require the following dipswitch settings on the back of
the TT33 units:
Switch 3 If the door strike is connected to the SP333 (Tö2) = OFF (as shown at Entrance 2)
If the door strike is connected to the TT33 (Tö) = ON (as shown at Entrance 1)
Switches 4,5, &6 identify the entrance number. In the above example:
Entrance #1 = 4 OFF/ 5 OFF/ 6 OFF Entrance #2 = 4 ON / 5 OFF/ 6 OFF
Switches 4,5, &6 on the KMB3-2 should be set the same as the corresponding Entry.
For more information refer to Page 10 Dipswitch Settings.
Be sure that the End of Line Jumpers are used on the camera circuit board and in the last
monitor on each riser. If the last unit on a riser is an audio only unit, the End of Line Jumper
would still be used on the last monitor on that riser. This is important for best picture quality.
(refer to Page 12) End of Line Jumper Locations.
NOTE: When using a Coaxial cable into a KBS3-2, ALWAYS connect a 75Ω( for RG-59) or
50 Ω(for RG-6) End-of-Line resistor between the coax center lead terminal and the (-)
terminal on the KBS3-2. Failure to do this may cause degradation of the video signal.
When connectin
g
C333-2 harness between SP333 and SNT333, ALWAYS observe 24VDC Polarit
y
.

8
System Notes – 2 wire COLOR: Important Information on Monitor Riser Connections
This section discusses the proper procedure for connecting monitors on a riser.
Although a digital system is very forgiving, it is best to follow these rules during installation to
maximize performance and minimize potential problems.
Using existing wiring:
When using existing wiring there are many things that can cause problems. The first is
of course, wiring condition and gauge. Solid or stranded does not matter but a minimum of
18 gauge twisted shielded wire with the shield NOT connected together is strongly
recommended. Using any lighter gauge may result in loss of performance and/or
introduction of interference from outside power sources.
Many installers run the cable the easiest way and this, unfortunately, is usually by
running the wire in a conduit or small enclosure right along side AC power lines, near
fluorescent ballasts, or machinery. It is therefore suggested that you run your own wiring
for this job in the recommended way, and avoid wiring with unknown potential issues. If
this is not possible, it is best to advise the customer that the system may not work up to its
full potential especially with regard to video display.
Proper BUS Connections to the Monitors:
Although the polarity of the BUS connections on a monitor on a line is not important, it
is good form to reverse the connections from monitor to monitor on a BUS line to prevent
the propagation of signal distortion by putting them “out of phase” with each other. On the
picture below, note how the monitors are “reverse connected” as they go up a riser.

9
All Monitor BUS lines must be terminated with an End of Line resistor on the last
monitor in the run. This is built into each monitor and can be installed by putting a jumper
connector on J1. The location of this jumper is illustrated on Page 12. If a BUS is not
terminated properly, the electronic characteristics of the line will change resulting in signal
degradation and poor video quality.
Using EVB33 Distribution Units with BUS risers:
Always try to avoid branching or “T-Tapping” to connect monitors from a riser as this
will cause changes in the riser electronic characteristics which may cause signal
degradation and poor video quality. However, when it is necessary to “T-Tap” a line from
a BUS line, there are two important things to remember.
1. Use an EVB33 for each “T-Tap” to help minimize issues with signal propagation. This
can be done in an “in-line” method alternating polarity of the monitors, (maximum of 6
monitors or 8-10 monitors on the total riser) or in a “star” pattern with up to three monitors
on their own “sub” risers.
2. Always use the End of Line jumper at the physical end of a riser line.
Both of these items are illustrated below.

10
Dipswitch Settings – Entries & Door Strikes
The QwikBus™ system uses dipswitches for identification of Entry stations, additional
cameras, and to enter “Programming Mode”.
Entrance Panels must have a unique code so the system knows where the call is coming
from and which door to open. Dipswitches 4, 5, & 6 on the back of the Speaker/Microphone
Unit (TSMB3 (Modular style) or TT33 (Custom style)) assign this code as shown in the chart
below.
When a Door Strike is used, It can be connected locally to the TSMB3 (Modular style panels)
or TT33 (Custom style Panels) Tö terminals, or connected to the SP333 Controller at the
Tö1, Tö2, Tö3, or Tö4 terminals (number is related to the entry number). You must let the
system know which connection you will use by the position of the #3 dipswitch for each entry.
Dipswitch #3 = OFF (SP333) or ON (TSMB3 or TT33). The entries DO NOT have to be set
alike.
TSMB3 Dipswitch Location TT33 Dipswitch Location

11
Entrance Panel Cameras
When using a Modular system, The Modular Camera (KMBC3*) is automatically identified by
being connected directly to the TSMB3 and takes the same Entrance number (1-8) of the
TSMB3.
When using a Custom Panel with a TT33 Speaker/Microphone/Controller, You can use
either a pinhole or CCTV type analog camera with it’s own power supply for system video
input. This camera will connect by coax to the KMB3-AM which is automatically identified by
being connected directly to the TSMB3 and takes the same Entrance number (1-8) of the
TSMB3.
Using analog cameras as add on observation cameras to the system.
You can add CCTV type cameras to the system that are not related to an entrance
panel to allow for observation of other areas using the KBS3-2.
As an example you could have 2 entries to the building using Camera #1 & #2, and use 3
observation cameras set as camera #3, #4, & #5. When a visitor rings from Entrance #1,
camera #1 will come on the monitor to display the visitor, but the resident can also cycle
through all five cameras by pressing the button.
When using any other camera(s) the KBS3-2 module must be used. This module has two
functions:
1. Converts the analog camera video signal to a digital signal that is used by the
QwikBus™ system. The analog signal is fed into this module from any pinhole or
CCTV type camera by a standard RG59 or RG6 coax and sends the converted to
digital signal out through the BUS connections to the system.
2. Establishes a Camera number for identification. If this camera is addressed as # 2 for
example, This KBS3-2 would be set to #2 using the dipswitches 4,5,&6 (7 is not used).
The 8 combinations are shown below.
NOTE: When using a Coaxial cable into a KBS3-2, ALWAYS connect a 75Ω( for RG-59) or
50 Ω(for RG-6) End-of-Line resistor between the coax center lead terminal and the (-)
terminal on the KBS3-2. Failure to do this may cause degradation of the video signal.

12
BUS End-of-Line Resistors – Jumper Locations
For proper system operation, the last video
monitor on a BUS riser as well as the last
camera on a run must have an End-of-Line
Resistors.
These resistors are built in to the printed
circuit boards and can be connected by
installing the jumper on the two pins labeled
J1.
Usually these jumpers are supplied on all the
monitors and camera boards and must be
removed if the unit is not the last camera or
monitor connected to the BUS line.
If there is only one camera used or one
monitor used, the End-of-Line resistors must
still be used.
The Chart to the left shows the locations of
the J1 pins on the different circuit boards.
NOTE: Do not confuse this End-of-Line Resistor with the End-of Line resistor required at the
end of a coax cable entering the KBS3-2. See page 9 for more information.

13
The Matrix – Wiring Pushbuttons to the TT33
Modular Button Assy.
Close up of TT33 Matrix Connections
The matrix consists of Common Connections a,b,c, &d and numbers 1 through 6.
Apartment Connections
101 A 1
102 A 2
103 A 3
104 A 4
201 A 5
202 A 6
203 B 1
204 B 2
301 B 3
302 B 4
303 B 5
304 B 6
PH1 C 1
PH2 C 2
PH3 C 3
# of Apartments Additional
Components
1 – 23 ---
24 – 55 E56
56 – 87 E88
88 – 119 E120
For systems larger than 119 apartments, contact Alpha Communications for assistance.
When using an STR Modular Button assembly, the system can read
which switch is being pressed by electronics built into the switches.
In the case of a Custom Panel, these electronics are built into the
TT33 and you must run wires to assign each button to a position in a
matrix.
The chart to the left shows an example of how a 15 button
panel could be connected using combinations of letters and
numbers to give each button a unique identification in the
electronic matrix.
As long as each button is connected to a unique combination
of one letter and one number then the system will be able to
assign addresses to each button.
Using the matrix on the TT33 module, you can get 4x6 (24)
unique combinations. One of these combinations (D6) is
reserved for special functions, so you can have up to a total of
23 apartments using the TT33 alone. If your system has more
apartments you may add the following parts (one for each
entry) which will extend the matrix by giving you more numeric
connections. Please refer to the chart below.

14
The IC2 Database Chip
The QwikBus™ system has 8 pin nonvolatile IC chips located on the back of each TSMB3
Speaker Microphone Module (in the Modular style Entry Panels) or TT33 Speaker
Microphone Module (in the Custom style Entry Panels). Each unit has this chip which
maintains the programming for that specific entry.
Arrows indicate mounting screws
NOTE: Special Tool shown above is required for opening VFS/FS panels as well as servicing
Modular Entry Panels. Part # 13510
If you have to replace a TSMB3 or TT33 unit, you can remove
the IC2 from the old unit and install it into the new unit so you do
not have to reprogram that entrance. When doing this
replacement, be sure to install it in the correct polarity indicated
by the mark on the chip.
Opening and Closing the VFS1000/ VFS1500/VHC3033-2 Inside Stations

15
PROGRAMMING SECTION for OPEN VOICE STYLE
NOTE: Depending on your choice of Entry Panel, you will either be using a TT33 or TSMB3
Module. The TT33 and the TSMB3 will both be referred to in this section as the
Speaker/Microphone
Programming the QwikBus™ System -- Open Voice (VFS1500/1000 FS1500/1000)
Programming the system is easily done with two installers. One to move from apartment to
apartment working with the monitors, and one to be at the entry panel pressing the
corresponding buttons.
1. Move Dipswitch 1 at Speaker/Microphone to ON position (Enter Programming Mode).
2. Press ON/OFF Button of Apartment Station to be programmed. (Opens communication to
the Entry Panel, Installers will be able to talk to each other).
3. Press the Entry Button to be assigned to the Apartment Station (4 beeps at the
Speaker/Microphone will indicate successful programming).
4. Press ON/OFF Button of Apartment Station.
5. Repeat Steps 2 through 4 for all apartments.
6. When Programming is completed move Dipswitch 1 at Speaker/Microphone to OFF
position (Normal Operating Mode).
Programming Indoor Stations for Parallel Operation
You can program up to 4 stations to ring with each pushbutton ( either for a residential
system or multiple stations in an apartment).
1. Move Dipswitch 1 at Speaker/Microphone to ON position (Enter Programming Mode).
Check that Dipswitch 2 is in the OFF position.
2. Press ON/OFF Button of Apartment Station to be programmed. (Opens
communication to the Entry Panel, Installers will be able to talk to each other).
3. Press the Entry Button to be assigned to the Apartment Station (4 beeps will sound at
the Speaker/Microphone). Press ON/OFF Button of Apartment Station (turn off).
4. Move Dipswitch 2 at Speaker/Microphone to ON position.
5. Press ON/OFF Button of Apartment Station to be programmed. (Opens
communication to the Entry Panel, Installers will be able to talk to each other).
6. (TSMB3) Hold down the “Light Button” while pressing the Entry Button used in Step 3.
OR (TT33) Press the same Entry Button used in Step 3.
7. Press ON/OFF Button of Apartment Station.
8. Repeat Steps 5 through 7 for each additional parallel station.
9. Move Dipswitches 1 & 2 to OFF position.

16
One Man Bench Programming -- Open Voice (VFS1500/1000 FS1500/1000)
If you prefer, the system can be preprogrammed on the bench to minimize your on-site
time and eliminate the necessity of a second installer. To do this the inside stations can
be connected separately one after another to the Speaker/ Microphone Module (either the
TSMB3 or the TT33) using the special programming cable (Part # EMPK-VFS/FS), or just
using 2 wires between the BUS terminals of both. Below is a step by step procedure for
this method.
1. Connect the TT33 or TSMB3 Speaker/Mic unit to BUS power and plug in programming
cable to the J1 terminals indicated by the blue arrow.
2. Move Dipswitch 1 to ON (programming mode).
3. Plug in other end of the cable to one indoor station as shown.
4. Hold down the light button until you hear a single tone (approx. 3 sec.)
5. Push the corresponding entry pushbutton. If the programming is successful you will
hear 4 tones at the Speaker/Mic unit.
6. Unplug the indoor station and mark it with the corresponding pushbutton to avoid a
mix-up.
7. Plug in the next indoor station and repeat steps 4 through 6 for the remaining units.
8. When programming is completed, Move Dipswitch #1 back to OFF (Normal mode)

17
Programming Open Voice VFS1500 for Intercommunication
You can install up to five VFS1500 stations and program them for intercommunication in the
same residence/ apartment.
To program a VFS1500 to ring when one of the numeric buttons on another unit is pressed:
1. At the Calling station, press and hold the button you wish to call the second station
until you hear a short tone. At this time the red LED will be blinking indicating that the
first station is in programming mode.
2. Go to the second station and press the ON/OFF button. You will hear a tone and
the system will exit programming mode. The calling station will now ring the second
station when that numeric button is pressed.
3. Repeat this procedure for all units being called from the first station, then move to the
second station and program all it’s buttons as needed, then the third etc., until all units
are programmed.
NOTE: To leave programming mode without changing programming,
press the function button.
To delete programming from a numeric button:
1. Press and hold the button you wish to deprogram. In approx. 3 seconds you will hear a
short tone. At this time the red LED will be blinking indicating that the first station is in
programming mode.
2. Continue to depress the button until you hear the tone a second time.
The programming for that button is now deleted.

18
PROGRAMMING SECTION for HANDSET STYLE
NOTE: Depending on your choice of Entry Panel, you will either be using a TT33 or TSMB3
Module. The TT33 and the TSMB3 will both be referred to in this section as the
Speaker/Microphone
Programming the QwikBus™ System – Handset Style (VHC3033-2 / HT3033)
Programming the system is easily done with two installers. One to move from apartment to
apartment working with the monitors, and one to be at the entry panel pressing the
corresponding buttons.
1. Move Dipswitch 1 at Speaker/Microphone to ON position (Enter Programming Mode).
2. Lift Handset of Apartment Station to be programmed. (Opens communication to the Entry
Panel, Installers will be able to talk to each other).
3. Press the Entry Button to be assigned to the Apartment Station (4 beeps at the
Speaker/Microphone will indicate successful programming).
4. Hang up Handset of Apartment Station.
5. Repeat Steps 8 through 10 for all apartments.
6. When Programming is completed move Dipswitch 1 at Speaker/Microphone to OFF
position (Normal Operating Mode).
Programming Indoor Stations for Parallel Operation
You can program up to 4 stations to ring with each pushbutton ( either for a residential
system or multiple stations in an apartment). Up to 8 stations can be programmed to ring
with the special TSMB3-8 module.
1. Move Dipswitch 1 at Speaker/Microphone to ON position (Enter Programming Mode).
Check that Dipswitch 2 is in the OFF position.
2. Lift Handset of Apartment Station to be programmed. (Opens communication to the
Entry Panel, Installers will be able to talk to each other).
3. Press the Entry Button to be assigned to the Apartment Station (4 beeps will sound at
the Speaker/Microphone). Hang up Handset of Apartment Station.
4. Move Dipswitch 2 at Speaker/Microphone to ON position.
5. Lift Handset of next Apartment Station to be programmed. (Opens communication to
the Entry Panel, Installers will be able to talk to each other).
6. (TSMB3) Hold down the “Light Button” while pressing the Entry Button used in Step 3.
OR (TT33) Press the same Entry Button used in Step 3.
7. Hang up Handset of Apartment Station.
8. Repeat Steps 10 through 17 for each additional parallel station.
9. Move Dipswitches 1 & 2 to OFF position.