LG Electronics GDK-20W, LKD-8DS installation manual Distance

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GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM

8.In multi-story environments, it is the best to plan coverage for each floor separately. However, because RF signals can travel between floors, a single base station could support multiple floors as long as base station broadcast area, traffic requirements, and other general guidelines are kept in mind.

Usually, DECT wave is attenuated by reflection indoors. In order to minimize attenuation, when you install a base station on the wall, give at least three-wave-length intervals. The intervals should be at least 45 centimeters because the wavelength is 15 centimeters at DECT frequency.

The best communication environment is when a base station and a user are in the same height. In office environment, however, it is desirable to consider office furniture to minimize reflection, diffraction and scattering of DECT wave when you set the position of a base station.

The appropriate position for a base station is where 1.8meter above from the floor and 0.5 meter below from the ceiling. The top of iron office furniture such as a cabinet or a desk is not a good position. Keep away from electronic equipment such as a copy machine, a printer or a computer. And the lower wall of a corridor where many people pass by, corner of a wall, and narrow indoors also should be avoided.

Attenuation

When determining the location of base station, you should consider the effects of attenuation. Attenuation is the loss of strength of a RF signal due to distance, antenna positioning, and obstructions. The guidelines provided in Location of Base Station on sub-clause C take attenuation into account, but this section provides additional important concepts.

The magnitude of change in signal strength is measured in decibel(dB). Increasing or reducing of 3dB results in doubling or halving signal power strength.

Distance

[Table 3.6.1] shows the signal attenuation caused by distance in direct line of sight condition.

Distance

Attenuation (dB)

1 meter

0

10 meters

20

100 meters

40

1000 meters

60

[Table 3.6.1] Signal Attenuation in Direct Line of Sight Condition

Obstructions

RF signals are also attenuated by obstructions in their paths. [Table 3.6.2] shows the attenuation caused by common materials in a building. You should try to limit the loss to 60dB.

Object

Approximate Loss in dB

 

 

Concrete

15

with metal siding

30

with window

8 to 9

Venetian blinds

10

Open

Closed

20

Soft partitioning

3 to 4

 

 

[Table 3.6.2] Signal Attenuation Caused by Building Materials

Although signals can travel through obstacles, you should place base stations so that signals begin their travel with a clear line of sight and travel through obstacles afterwards. In the example shown in Figure 3.6.12, the base station is placed to maximize line of sight in both corridors.

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Contents Digital Wireless Key Telephone System Installation Manual Revision History Table of Contents Admin Programming Regulatory Information PurposeInterference and Attenuation Replacement of Lithium BatteriesHearing AID Compatibility PicturesAbbreviations Introduction MFB System CapacityIsdn BRI PMUSTA Isdn1 Dimensions & Weights Height Width Depth System SpecificationsFlash Memory 4 Electrical Specifications AWG WireLcobesp System ComponentsRing Generation UnitRGU Key Service Unit KSUMain Board Unit MBU Program Module Unit PMUInterface Board Stib Wireless Terminal Interface Board WtibInterface Board STIB2 Dvib Digitized Voice Interface Board General Site Considerations Site PreparationVerify On-Site Equipment Back-Board InstallationMounting the KSU KSU & Power Installation2 KSU Mounting Holes & Installation layout Power InstallationKSU Grounding Main Board Unit MBU Installation PCB InstallationPCB Handling & General Installation 2 MBU Installation OFF PMU Installation MFB Installation RGU InstallationSW2 SW1 CN2 Isdn STIB2 & Stib S/T Interface Board InstallationSW1 CN2SW2 SW2Dvib Digitized Voice Interface Board Installation Wtib Wireless Terminal Interface Board Installation11 Connectors of the Dvib Battery Back-Up Wiring Installation System WiringGeneral Purpose Relays Wiring Music on Hold MOH WiringFerrite Core Installation Alarm Detect Port Wiring4 Ferrite core on signal wires Components of the Dect system Overview of the Dect system1 Components of a Dect system Base Station GDC-200B GDK-20W Digital Wireless Key Telephone SystemWtib Wireless Terminal Interface Board Terminating a Call How to make CallsBefore Making Initial Call Controlling a CallBase Station GDK-20W DectAntenna Diversity Subscription Low Battery Alarm 8 Single-Slot Charger 330-SSC, 340-SSC Site Survey System ConfigurationBefore Installation Base Station Broadcast Range and Location 9 Base Station Service AreaGeneral Guidelines CRSCell-Coverage Region Survey ToolDistance Fading Reporting Results Rssi Monitoring Possible in GDC-335H onlyCheck list for Survey Data Korea Dect Survey Report Template NumberExample 2 Base Station Coverage in Adjoining Areas ExamplesExample 1 Centralizing Base Stations 15 Location of Base Station in Office Environment Example 3 Maximizing Line of SiteEquipment Check Hardware InstallationWtib Installation Unit Installation18 Wall Mounting of Base Station without wedge 20 LCD Message of Unsubscribed GDC-335H GAP and GDC-340HGAP System ID User subscription/desubscriptionConditions Authentication CodeAt the GDC-335H User SubscriptionAC code + User Desubscription At the GDC-340H Menuup or Down Summary of Dect Installation Stib Isdn DescriptionBasic Features of Isdn Device S-Interface GDK-20W Digital Wireless KEY Telephone System Features of Isdn CO Line T-Interface Unknown / National Type / International / Subscriber Remark System CapacitiesGDK-20W Numbering PLAN*1 Feature CodesTRANS/PGM+*1 TRANS/PGM+#4MON+DND/FOR+7 MON+DND/FOR+#SLT, DND SLT/WHTU*2 Features Basic Extension RemarksBasic and Extended Numbering Plans LCD MonthsSLT Ring Cadence Audible SignalsTone / Ring Cadence SLTFrequencies and Tones GDK-20W Digital Wireless KEY Telephone System Maximum Number of CO Lines in GDK-20W 8 Ports GDK-20W ConfigurationGDK-20W Station Configuration with LKD 2B Maximum Number of Stations in GDK-20W 34 PortsGain Controlsystem Basemain Menu 5 SUB Menu Wireless Cell / Terminal ConfigurationNumber of Ports Default Number Description Maximum Number of Ports Station / CO in GDK-20W 38 PortsSLT Rx Gain Country CIS Dktu SLT DCOSLT DCO Introduction To Enter the Programming ModeAdmin Program Start Press Flex KEY1-12 General DescriptionTERMINAL-MENU HOW to ProgramMAIN-MENU SUB-MENUYES Example of Admin. ProgramProcedure DNDStation Attribute Button DefinitionFlex KEY Main Menu SUB Menu Admin ProgrammingAdmin Programming Index SYS TMR SYS PGMUCD SUB Menu Flex KEY Terminal Menu Range Default Remark Default ValuesLoop Didrn SUB Menu Flex Terminal Menu Range Default Remark KEYPBX / CO Isdn CO Colp2.3 Isdn Program Main Menu Flex SUB Menu Terminal Range Default Remark KEYSmdr SYS / EXCDID/DISA MUSIC1 DktuDtmf RX ToneYES/NO DVU Flex KEY SUB Menu Terminal Menu Default Remark SUB Flex SUB Menu Range Default Remark KEYTimer DMT Flex KEY SUB Menu Range Default RemarkDisable Override Always LDT2.10 Hunt GROUP/VOICE Mail Program Main Menu