Panasonic Kx Taw848 Installation Manual

							2.6 Connection of Extensions
Installation Manual 71
2.6.2 Parallel Connection of the Extensions
Any SLT can be connected in parallel with an APT as follows:
Note
In addition to an SLT, an answering machine, a fax machine or a modem (PC) can be connected in 
parallel with an APT.
To a Hybrid Port
4-conductor wiring cord
Connect pins T, R, D1,
and D2.2-conductor wiring cord
Connect pins T and R.
SLT APTModular
T-Adaptor 
						

							2.7 Connection of 2.4 GHz Portable Stations
72 Installation Manual
2.7 Connection of 2.4 GHz Portable Stations
2.7.1 Overview
The following equipment is required to connect the wireless system:
CS: Cell Station (KX-T0141)
This unit determines the area covered by the wireless system. Up to 2 calls can be made at the same time 
through each CS.
PS: 2.4 GHz Portable Station (KX-TD7680/KX-TD7690)
The KX-TAW848 can support up to 28 PSs. For more details about the PS, refer to the PS Operating 
Instructions.
CAUTION
 The CS should be kept free of dust, moisture, high temperature (more than 40 °C [104 °F]), low 
temperature (less than 0 °C [32 °F]), and vibration, and should not be exposed to direct sunlight.
 The CS should not be placed outdoors (use indoors).
 The CS should not be placed near high-voltage equipment.
 The CS should not be placed on a metal object.
 Systems using 2.4 GHz ISM (Industrial, Scientific and Medical) band may interfere with the 
wireless system. Examples of such systems are cordless telephones, wireless LAN, Home RF, 
microwave ovens and other ISM devices. These systems may cause minor noise.
 Keeping some distance between the equipment listed below may prevent interference. (The 
distance may vary depending on the environment.)
Equipment Distance
CS and office equipment such as a computer, telex, fax 
machine, etc.More than 2 m (6 ft 7 in)
CS and PS More than 1 m (3 ft 3 in)
Each PS More than 0.5 m (1 ft 8 in)
PBX and CS More than 2 m (6 ft 7 in)
CS and CS More than 15 m (49 ft)
Please take into consideration the distance between the CSs when site planning. Please consult 
your dealer for details.
However, the required distance between CSs may vary depending on the environment of the 
installation site and conditions in which the wireless system is used. Conduct the site survey to 
determine the appropriate distance. 
						

							2.7 Connection of 2.4 GHz Portable Stations
Installation Manual 73
2.7.2 Procedure Overview
When connecting the wireless system, use extreme care in conducting the site survey. An incorrectly 
performed site survey can result in poor service area, frequent noise, and disconnection of calls.
1. Investigate the installation site
Refer to 2.7.3 Site Planning.
a.Obtain a map of the CS installation site.
b.Identify the service area required by the user on the map.
c.Plan the location of each CS, taking account of distance, building materials, etc.
2. Prepare the CS for site survey
Refer to 2.7.4 Before Site Survey.
a.Assign a CS number to each CS by setting the DIP switches on the back of the CS.
b.Supply electricity to each CS using an AC adaptor or a battery box.
c.Install each CS temporarily as planned.
Notes
 Install at least 2 m (6 ft 7 in) above the floor.
 Keep the antennas in the upright position.
3. Conduct the site survey
Refer to 2.7.5 Site Survey.
a.Test the radio signal strength using the PS.
Confirm that the radio signal strength level is 12 near the CS.
Using the KX-TD7680
Using the KX-TD7690
b.By walking away from the CS with the PS, check the radio signal strength. The radio signal strength 
weakens as you walk away from the CS.
c.Map the CS coverage area at radio signal strength levels 3 and 8. 
d.Make sure that adjacent CS coverage areas overlap where the radio signal strength level is 8 by 
at least 5 m (16 ft).
e.Make sure that the radio signal strength level is greater than 3 at any location within the service 
area required by the user.
Display example:
Press 1, 9, and POWER
for more than 2 seconds.
 >CS NO.1 LEVEL:12
SAVE:0123456789
1 to 9
CS No.190
Display example:
Press 1, 9, and POWER
for more than 2 seconds.
 >CS NO.1 LEVEL:12
SAVE:0123456789
1 to 9
CS No.1990 
						

							2.7 Connection of 2.4 GHz Portable Stations
74 Installation Manual
4. Finish the site survey
Refer to 2.7.6 After Site Survey.
a.Return all DIP switches of each CS to the OFF position, and stop supplying power.
b.Turn off the PS.
5. Connect the CS and PS to the PBX and test the operation
Refer to 2.7.7 Connecting a Cell Station to the PBX.
a.Connect the CSs to the PBX.
b.Register the PSs to the PBX.
c.Walk around the service area while having a conversation using a registered PS. If noise is 
frequent or conversations disconnect, relocate the CSs or install an additional CS.
6. Mount the CS on the wall
Refer to 2.7.8 Wall Mounting.
a.If there are no problems in testing, mount the CS on the wall. 
						

							2.7 Connection of 2.4 GHz Portable Stations
Installation Manual 75
2.7.3 Site Planning
Choosing the best site for the CS requires careful planning and testing of essential areas. The best location 
may not always be convenient for installation. Read the following information before installing the unit.
Understanding the Radio Waves
Characteristics of Radio Waves
The transmission of radio waves and the CS coverage area depend on the structure and materials of the 
building.
Office equipment, such as computers and fax machines, can interfere with radio waves. Such equipment 
may create noise or interfere with the performance of the PS.
The illustration below shows the special transmitting patterns of radio waves.
1.Radio waves are reflected by objects made of materials such as metal.
2.Radio waves are diffracted by objects such as metallic columns.
3.Radio waves penetrate objects made of materials such as glass.
Relationships Between Radio Waves and Building Structure and Materials
 The CS coverage area is affected more by the building materials and their thickness than the number 
of obstacles.
 Radio waves tend to be reflected or diffracted by conductive objects and rarely penetrate them.
 Radio waves tend to penetrate insulated objects and are rarely reflected by them.
 Radio waves penetrate thin objects more than thick objects.
 The table below shows the transmission tendency of radio waves when they reach objects made from 
various materials.
CS
Column
3. Penetration2. Diffraction1. Reflection 
						

							2.7 Connection of 2.4 GHz Portable Stations
76 Installation Manual
Object Material Transmission Tendency
Wall Concrete The thicker they are, the less radio waves penetrate them.
Ferroconcrete Radio waves can penetrate them, but the more iron there is, 
the more radio waves are reflected.
Window Glass Radio waves usually penetrate them.
Glass with wire net Radio waves can penetrate them, but tend to be reflected.
Glass covered with 
heat-resistant filmRadio waves are weakened considerably when they penetrate 
windows.
Floor Ferroconcrete Radio waves can penetrate them, but the more iron there is, 
the more radio waves are reflected.
Partition Steel Radio waves are reflected and rarely penetrate them.
Plywood, Glass Radio waves usually penetrate them.
Column Ferroconcrete Radio waves can penetrate them, but the more iron there is, 
the more radio waves tend to be reflected or diffracted.
Metal Radio waves tend to be reflected or diffracted.
Cabinet Steel Radio waves are usually reflected or diffracted, and rarely 
penetrate them.
Wood Radio waves can penetrate them, but they are weakened. 
						

							2.7 Connection of 2.4 GHz Portable Stations
Installation Manual 77
CS Coverage Area
The example below shows the size of the coverage area of 1 CS if it is installed in an area with no obstacles.
Note
Radio signal strength levels are measured during the site survey (refer to 2.7.5 Site Survey).
Site Survey Preparation
1.Obtain a map and investigate the installation site.
a.Check the obstacles (e.g., shelves, columns, and partitions).
b.Check the materials of the structures (e.g., metal, concrete, and plywood).
c.Check the layout and dimensions of the room, corridor, etc.
d.Write down the above information to the map.
2.Examine the service area required by the user on the map, referring to the following example.
a.Draw the coverage area around a CS. Extend the coverage area 30 to 60 meters (98 to 197 feet) 
in each direction, depending on the materials of the building structures and obstacles in the 
installation site. Note that a CS cannot be installed outside a building.
b.If one CS cannot cover the entire service area, install additional CSs as required. Overlap the 
coverage areas of adjacent CSs.
Where CS coverage areas overlap, the PS will start call handover to the next CS if the signal from 
Gray Zone:
Conversation will be 
intermittentCoverage Area
Radio signal strength level is 
greater than 3.
(About 50 m to 60 m
[164 ft to 197 ft])
Good Coverage Area
Radio signal strength
level is greater than 8.
(About 30 m to 40 m
[98 ft to 131 ft])
Good sound quality can
be maintained.
Out of Service:
Cannot make/receive calls
A
B
A
B
Radio Signal Strength Levels
C
Out of range
Receives noise easily or disconnects
May receive noise
Good
Better Level: 00
Level: 01 to 02
Level: 03 to 07
Level: 08 to 10 
Level: 11 to 12 
						

							2.7 Connection of 2.4 GHz Portable Stations
78 Installation Manual
one CS becomes weak. However, if a PS moves away from a CS and there are no CSs available 
for handover, the PS may go out of range and the call could be lost.
If the signal from the CS fades, due to the structure of the building, there may be some handover 
delay. The user will hear a range warning before handover in this case. This also applies in the case 
of interference from 2.4 GHz apparatus.
Example: Installing in a Room Separated by Interior Walls
Things to take note of:
 The room is separated by interior walls.
 The room is surrounded by concrete walls.
CS installation plan:
 The coverage area of each CS will not extend as far as when there are no obstacles, because the 
radio signals will be weakened by separating walls. Therefore, you will need 4 CSs to cover the 
entire room.
CS no. 2
CS no. 1
CS no. 4
CS no. 3
70 m
(230 ft)
100 m (328 ft) 
						

							2.7 Connection of 2.4 GHz Portable Stations
Installation Manual 79
2.7.4 Before Site Survey
Setting and Installing the CS Temporarily for Site Survey
1.Switch the Radio Signal Test switch from OFF to ON.
2.Set the CS number switches as desired.
Note
If more than 1 CS is in Radio Signal Test mode, each CS must have a unique CS number.
CS Number Switch
CS no. 1 CS no. 2 CS no. 3 CS no. 4 CS no. 5 CS no. 6 CS no. 7 CS no. 8 CS no. 9
1
2
3
41
2
3
41
2
3
41
2
3
41
2
3
41
2
3
41
2
3
41
2
3
41
2
3
4
DIP Switch
1
2
3
4
5
6
OFF ON
Radio Signal 
Test Switch
Keep this switch at the default
OFF position. Otherwise, the
CS will not function. 
						

							2.7 Connection of 2.4 GHz Portable Stations
80 Installation Manual
3.After setting the DIP switch, connect an AC adaptor or battery box to the CS using a power supply 
adaptor.
Note
The AC adaptor should be connected to a vertically oriented or floor-mounted AC outlet. Do not connect 
the AC adaptor to a ceiling-mounted AC outlet, as the weight of the adaptor may cause it to become 
disconnected.
4.Install the CS temporarily for the site survey. Install the CS at least 2 m (6 ft 7 in) above the floor, keeping 
the antennas in the upright position.
To AC Adaptor (KX-A11/KX-TCA1)/
Battery Box (PSZZTD142CE)Power Supply Adaptor
(PSZZ1TDA0142)
Modular
Telephone Cord