Installation guide

TD 92408EN
9 December 2011 / Ver. G
System Planning
Ascom VoWiFi System
38
A.5 Interoperability i62
A.5.1 WLAN
For information about the supported WLAN infrastructures for i62 please see the
interoperability site on the Extranet; https://www.ascom-ws.com/
AscomPartnerWeb/en/
startpage/Sales-tools/Interopera
bility/Verified-Products/
A.5.2 SIP
On the IP-PBX side we will re-use our thoroughly tested and stable SIP/H.323-stack on i62
as we do on IP-DECT and i75. This means that IP-PBX’s certif
ications for i75 are applicable
and supported also for the i62. SIP interoperability tests for i62 will continuously be
performed and for the latest information please see the inte
roperability site on the
Extranet; https://www.ascom-ws.com/AscomPartnerWeb/e
n/startpage/Sales-tools/
Interoperability/Verified-Products/
A.6 Guidelines
A.6.1 Designing for Clients
In a Wireless LAN, APs are normally of the same brand and mo
del. What differs is the mix of
clients that need to be supported.
Some vendors that produce both clients and WLAN
infrastructure systems may have added
additional features that are only used when the two work together. One example is the Cisco
Compatible Extension (CCX) that is supported in Cisco’s WLAN and in certified clients. CCX
clients may benefit from Cisco additional features in the WLAN where other clients may not.
When designing WLAN a lot of attention must b
e paid t
o the design of the coverage,
capacity and placement of the radio cells. The criteria that influence the design is based on
the applications and devices that needs to be supported. Often this has to be a compromise
of the needs of those applications and devices using the same WLAN infrastructure.
In the design process a WLAN architect needs to kn
ow the behavior of the different clients.
This can partly be read in the best practices documents published by the vendors. Today
such criteria values are used as input parameters in WLAN planning software. The planning
software then calculates a placement pattern where APs should be mounted.
Planning tools have to know a lot a
bout the
radio environment and the layout and building
structures of the site. The quality of a report from such a WLAN CAD program is dependant
on the input added to the software by the designer. After installation a site survey is done,
preferably for every type of client to check for the performance achieved. A technician
should use the clients built in software, or a Site survey tool for these measurements. If
normal behavior of the client used is unknown then there is a risk that this confirmation of
the installation may be incorrect.
The information which can be read in the clients is th
e information received from th
e APs.
But it is equally important to read the values measured by the AP of the performance of the
client. This is of course easier to achieve in a controller based WLAN where this information
is available in a central device.
A.6.2 Client Behavior Experience
A WLAN designer and installer must know how a s
p
ecific client behaves in different types of
environments. By building on experience from installations done previously it is possible for
a skilled technician to estimate the performance of a client at a new site.