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SpectraLink IP-DECT Server 2500, Deployment Manual

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Synchronization and Deployment Guide

 

• 

To get maximum coverage from a base station the bases must be as visible as possible. A 
guideline can be to consider where a light bulb can be placed to light up the maximum area. 

RSSI 70 

• 

Traffic 

– how many simultaneous calls can be expected in an area. 

— 

In an assembly area e.g. in a canteen there will probably be many simultaneous calls 
during lunch. 

— 

To get an estimate of the simultaneous calls Erlang can be calculated. 

14169000 Version 9.3

 

October, 2016

 

21

 

 

Summary of Contents for IP-DECT Server 2500

Page 1: ...Spectralink DECT IP DECT Server 400 6500 2500 8000 Synchronization and Deployment Guide 14169000 Version 9 3 October 2016 ...

Page 2: ...tion Do not remove or allow any third party to remove any product identification copyright or other notices Notice Spectralink Corporation has prepared this document for use by Spectralink personnel and customers The drawings and specifications contained herein are the property of Spectralink and shall be neither reproduced in whole or in part without the prior written approval of Spectralink nor ...

Page 3: ... 9 On site Deployment Deployment Tools Important parameters Deployment rules of thumb IP Base Station using Synchronization Over The Air 11 13 13 14 Deployment procedure 14 Placement of base stations 16 Digital Base Stations and IP Base Stations using LAN Synchronization 17 Deployment procedure 18 Placement of base stations 20 LAN Based Radio Synchronization Precision Time Protocol Background Depl...

Page 4: ...and Administration 28 DECT IP DECT Server System Settings 28 Base Station Individual Settings 29 Base Station Synchronization Status 29 Troubleshooting Troubleshooting Deployment 31 Troubleshooting Synchronization 31 ...

Page 5: ...following Using a handset to measure and record Q and RSSI values RF values Selecting a proper mounting location for base stations and repeaters Making sure that the company LAN meets the LAN Synchronization requirement limits and documenting the deployment About Synchronization In a multi cell DECT system the base station radios must be synchronized to each other in order to achieve the optimum h...

Page 6: ...y the handset in which the speech channel carrying an active conversation is passed from one base station to another Erlang The erlang is a dimensionless unit that is used in telephony as a measure of offered load or carried load on service providing elements such as telephone circuits or telephone switching equipment LED Light Emitting Diode Ni MH Nickel Metal Hydride Q Value Signal Quality Facto...

Page 7: ...ons over Air radio RF Radio Frequency RSSI Value Radio Signal Strength Indication value A relative expression for the signal strength of a base station as measured by the handset at a given location Site survey A site survey comprises the act of locating the mounting location and noting the cabling requirements for all base stations and repeaters Speech channel A speech channel is used to carry co...

Page 8: ... synchronization Digital base station Can the cabling be reused yes no partly Investigate Is all cabling twisted pair end to end recommended equal to CAT5e Is cabling present where DECT coverage is needed Are all junction points of good quality From these investigations the costs to get cabling up to a satisfactory standard can be estimated Note Today new systems can be a combination of wired and ...

Page 9: ...eople placed those that will use the DECT IP DECT system Are there areas with extra high voice traffic load like Canteen Nurse office Etc Rough estimation of equipment if possible Arough budgetary estimate of equipment base stations can be calculated according to below Open area indoor Office area DECT systems Size of area to cover in m2 800 number of digital base stations Necessity approximately ...

Page 10: ...ons have 4 8 channels whereas IP base stations have 11 channels Digital base stations and IP base stations with LAN synchronization can have longer distance between base stations as opposed to IP base stations with synchronization Over The Air OTA Synchronization is essential for handing over calls from one base station to another Note Before going on a site remember to have confirmation from the ...

Page 11: ...ed calls Take a walk around the premises to create an overview and check that the information uncovered during the pre planning phase is correct valid Consider internal structure material moving interior are there materials that affect absorb propagation is the interior as expected Create a rough overall plan for how to execute the deployment If deploying IP base stations with Over The Air synchro...

Page 12: ...t be connected to pin 6 Preferably the tripod shall place the Spectralink IP DECT server 400 at the height where you will place the server base stations repeaters in the final installation If 2 people perform the deployment at IP DECT sites you shall also bring Minimum 1 Spectralink DECT repeater the repeater must be set up to synchronize on the Spectralink IP DECT server 400 used for the deployme...

Page 13: ...k DECT handset 7622 7642 7722 7742 Consider also to bring a device you can use to play sound in the handset A good idea would be also to bring a laptop with network cable to connect with the Spectralink IP DECT server 400 If you bring a repeater you should also bring power supply for the repeater and repeater programming kit Product ID 02509210 When bringing a repeater you must also bring a serial...

Page 14: ...escribe RPN values and time slots RPN values range from 00 to FF Time slot values range from 0 to B there are12 time slots Third line shows that the actual base station has RPN number 8 signal quality of connection is 64 signal strength RSSI 108 3BC means third frequency time slot B and that the last handover was a connection handover C A signal quality of 64 is a connection without errors this nu...

Page 15: ...h the sync master placed in the middle Sync master Sync chains Deployment procedure Start by placing your tripod with the Spectralink IP DECT server 400 from your deployment tools where you plan the first base station the sync master to be 14169000 Version 9 3 October 2016 14 Necessary overlap in sync chains Necessary overlap between sync chains ...

Page 16: ...ue drops below 75 and the Q value stays constant at 64 Do this in all directions from the base For a description of the parameters and RPN values see Important parameters on page 13 To perform a site survey on the deployment handset find the Survey menu from the Main menu of the handset To perform a site survey using an ordinary handset press 99989 Hook It is important to measure all places where ...

Page 17: ... must be as visible as possible A guideline can be to consider where a light bulb can be placed to light up the maximum area RSSI 75 Traffic how many simultaneous calls can be expected in an area In an assembly area e g in a canteen there will probably be many simultaneous calls during lunch To get an estimate of the simultaneous calls Erlang can be calculated 14169000 Version 9 3 October 2016 16 ...

Page 18: ...r than one less base station A good documentation of the deployment is needed to build the synchronization chains Digital Base Stations and IP Base Stations using LAN Synchronization In DECT IP DECT systems it is important to ensure an overlap on the base stations at all timers of 15 m to ensure a call can be handed over at normal walking speed Note Synchronization between the digital base station...

Page 19: ...tralink DECT server 400 2500 from your deployment tools where you plan the first base station to be Place the first base station in a corner of the building so there is coverage in the corner Take picture of the placement and note it on a blueprint of the building 14169000 Version 9 3 October 2016 18 ...

Page 20: ...locking the radio signals when holding the handset to the ear Do this in all directions from the base stations To perform a site survey on the deployment handset find the Survey menu from the Main menu of the handset Note how far the place is from the tripod with the Spectralink DECT sever 400 2500 Find the next place for the base station app 2 x the above distance from the first placement Conside...

Page 21: ...r to document each placement for base stations Take pictures of where exactly the base station must be placed Note it on a drawing of the premises Placement of base stations When determining where to place the base stations following points have to be considered 14169000 Version 9 3 October 2016 20 ...

Page 22: ...consider where a light bulb can be placed to light up the maximum area RSSI 70 Traffic how many simultaneous calls can be expected in an area In an assembly area e g in a canteen there will probably be many simultaneous calls during lunch To get an estimate of the simultaneous calls Erlang can be calculated 14169000 Version 9 3 October 2016 21 ...

Page 23: ...m reflecting materials like metal Base stations shall be placed away from other DECT base stations When in doubt deploy i e to ensure a good coverage place one more rather than one less base station A good documentation of the deployment is advisable as it could be needed for future improvements evaluations or troubleshooting 14169000 Version 9 3 October 2016 22 ...

Page 24: ...ger required to be in range of each other It may however not be the ideal solution in all cases LAN based synchronization requires that the base stations involved in a handover are on the same network segment and the network deployment including LAN switches meets a number of quality criteria Precision Time Protocol Background Precision Time Protocol version 2 PTPv2 is used to synchronize the radi...

Page 25: ...ould be noted that depending on the deployment Synchronization via LAN and radio can be combined in the same DECT installation Even when a base station is configured to synchronize via LAN it transmits the signal required for synchronization via radio Therefore base stations synchronizing via radio can retrieve their synchronization signal from a base station synchronizing via LAN The other way ar...

Page 26: ...k the IP base stations will not be able to achieve LAN synchronization Timing and Jitter For PTPv2 to be accurate enough to synchronize the DECT radios the network jitter must be low that is the network packet delay must be close to constant The PTPv2 algorithms in the base stations have built in filtering which make them able to cope with some level of jitter However prolonged periods of large ji...

Page 27: ...h two access switches connected Here the worst case path length is three switches Note In the lab the IP base stations have successfully been synchronized with 5 enterprise LAN switches between master and slave Traffic Load The traffic load on the switches will also affect the jitter High traffic load and especially a large number of large packets will increase the jitter For example a 1500 bytes ...

Page 28: ...k parts When using static configuration the relevant multicast addresses listed earlier must be forwarded to the ports forming the deployment network Enabling IGMP snooping on the switches allow them to automatically configure which ports the multicast packet should be forwarded to minimizing the network load caused by the LAN synchronization In order to keep the multicast configuration updated a ...

Page 29: ... 2016 29 Type This setting controls the synchronization type for specific base station The following values can be selected Free running Radio LAN Gateway Default sync type This setting controls the default synchronization type for new base stations The following values can be selected Free running Radio default LAN LAN sync transport protocol This setting controls the protocol used as transport f...

Page 30: ...chronization has been lost and a percentage which is the ratio of time the base station has been without synchronization The lost counter must be low but is expected to grow slowly over time The percentage will start high and must be zero after some time 14169000 Version 9 3 October 2016 30 ...

Page 31: ...tion is OK at startup but fails after a short period IGMP snooping is active but no IGMP querier is present on the network to refresh multicast group memberships Add an IGMP querier to the network or disable IGMP snooping Base stations do not synchronize or loose synchronization often The traffic between base stations is being delayed a varying amount of time due to traffic load switch quality or ...

Page 32: ... Specifications subject to change without notice Spectralink Corporation 2560 55th Street Boulder CO 80301 USA Spectralink Europe ApS Spectralink Europe ApS Bygholm Søpark 21E DK 8700 Horsens Tel 45 7560 2850 infodk spectralink com www spectralink com ...

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