© Aastra – 2012 SIP-DECT 4.0 RFP 43 WLAN June 2012.

© Aastra – 2012

SIP-DECT 4.0

RFP 43 WLANJune 2012

© Aastra - 2012 2Aastra confidential information / for training purpose

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Wireless LAN

Wireless LAN


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WLAN Standards (Summary)

802.11a (1999)– Physical Layer in 5 GHz band– data rate up to 54 Mbit/s using OFDM

802.11b (1999)– data rate up to 11 Mbit/s using CCK / DSSS

802.11g (2003)– Physical Layer in 2,4 GHz band– data rate up to 54 Mbit/s using OFDM– backward compatible to 802.11b

802.11n (2009)– Physical Layer in 2,4 GHz and 5 GHz band– data rate up to 600 Mbit/s using OFDM / MIMO– backward compatible to 802.11b/g / 802.11a

» 802.11i (2004)– additional WLAN security– AES, TKIP, EAP (base for WPA2)

» 802.11e (2005)– Medium Access Control(MAC) Quality of Service Enhancements– automatic power save delivery


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WLAN Applications

environmentshotelshospitalsoffice buildingsproduction halls....

applications» healthcare» logistics» Internet / network» ....

devices» laptops » PDAs» phones» ....


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WLAN Frequency (General)

There are 3 overlap-free channels in 2.4 GHz ISM band (using 802.11b/g + n-HT20) e.g. 1 – 6 – 11. Each channel has a bandwidth of 22MHz. APs should always be 5 channels seperated from each other.

Ch: 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Freq: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 2484

Channel

Frequency

2.4 GHz ISM (channels EMEA: 1-13, NA: 1-11)

Channel 36 40 44 48 52 56 60 64 100 - 140 149 - 165

Frequency 5180 5200 5220 5240 5260 5280 5300 5320 5500,…,5700 5745 - 5825

5 GHz ISM

In 5 GHz all channels are overlapping free. The usage of certain channels is bound to regulatory requirements, Access Point capabilities (DFS, TPC) and indoor / outdoor usage.


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WLAN Frequency Planning

For planning the channels for a base of a site-covering radio network, the distance between two base stations with the same frequency should be at least double that of the coverage. The coverage can be adjusted with the help of the Output Power Level parameters by 6% / 12% / 25% / 50% or 100%.

1 13

1

7

137

Using the 802.11n HT40 mode two WLAN channels will be combined for more troughput. This reduce the number of non overlapping channels in 2.4 GHz frequency. 6 111

secondaryprimary (1)

HT40 (double channel) vs HT20 (single channel)


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WLAN 802.11n MIMO

Using 802.11n, AccessPoints and clients (stations) can use multiple antennas to transmit or receive data on individual streams.

Multiple Input Multiple Output (MIMO) allow higher data rates and provide better radio conditions as signals can be received by multiple antennas.

Mode HT20 HT40

1x1 72 150

2x2 145 300

3x3 216 450

4x4 288 600

maximal phy. data rates (Mbit/s)

The RFP43 support the 2x2 antenna modewith the maximal data rate of 300 Mbit/s

data rates vary on the radioenvironment and devices capabilites.


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WLAN Security = Authentification + Encryption

Authentification: • SSID – Service Set Identifier• Access filter e.g. MAC address filter, external radius server

Encryption details

WEP (Wired Equivalent Privacy)

Not recommended, because this is not safe !!usage to support old clients with no WPA support

WPAWi-Fi Protected Access

WPA 2 using AES is presently the most secure WLAN encryption in the market

WPA 1 / 2PSK (pre shared key)

for households and small enterpriseusing a secret / password on all WLAN stations

WPA 1 / 2 Enterprise

for SME / MLE using a Radius Server (802.1x) for the station authentication e.g. using EAP-TLS


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WPA Authentification with a Radius Server

Authentification

Radius Server

WLAN | LAN

Master Secret

EAP / 802.1x Authentification

Key

Normal data traffic

StationAccess Point

Key

Normal data trafficLAN

LAN

Client CertificatePrivate + Public Key

CA CertificatePrivate + Public Key

Server CertificatePrivate + Public Key

CA CertificatePrivate + Public Key


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VLAN 802.1q

The RFP 42 / 43 supports VLAN tagging (separation) for up to 4 WLANs and Voice data. e.g. for enabling the separation of different WLAN network‘s and the telephone network.

DataDataDataData

VoIP (e.g untagged)

WLAN Data RFP 42/43

Sw

itch

DECT Voice

WLAN Data

WLAN Data

WLAN Data

Internet

corporateLAN

Voice LAN


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WLAN Profile Configuration

Service Set Identifier (SSID): Name / Description of this WLANVLAN tag: tag WLAN data to this VLAN and receive with this tag802.11 mode: WLAN mode 802.11n preferedHidden SSID mode: send no SSID in beacon packets

Create WLAN profiles which later can be assigned to the RFPs.Profiles have to be defined for RFP types e.g. RFP(L)42 or RFP(L)43


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WLAN Profile Configuration (2)

Select the security type: open, WEP, WPA(2)-PSK, WPA(2)-802.1x


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WLAN Profile Configuration (3)

Distribution interval: key exchange interval for WPARadius Settings: IP address and Port of the Radius server and the secret to authenticate the basestation as radius client WME: Wireless Media Extentions (for QoS, required for 802.11n)

Multiple SSID: one profile can have up to 4 different SSIDs

Be aware that on RFP(L) 42 only SSID1 can be broadcast.All other SSIDs have to be known to the station as they arehidden SSIDs.


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RFP WLAN Configuration

Assign the WLAN profile to your RFP’s (42 / 43).

WLAN profile: ID of the WLAN profile(need to match RFP type)

802.11 channel: (selection depend on profile)1-14 = 2,4 GHz 802.11b/g or 802.11n36-48 = 5 GHz 802.11a or 802.11n

Output power level: WLAN transmit power

HT40: activate WLAN channel bundle for moretroughput. In 2.4 GHz this reduce the number ofoverlapping free channels! Use only for single spots.

The RFP(L) 43 can operate as WLAN Access Point and OMM at the same time.If the OMM reside on a RFP (L) 42 the WLAN function is disabled.

The RFP type need to be known in the OMM to apply a WLAN Profile.e.g. RFP is connected or type is set by OMP

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© Aastra – 2012 SIP-DECT 4.0 RFP 43 WLAN June 2012.

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