HP Mobile 8540w manual Media Access Protocol CSMA/CA Collision Avoidance with ACK

QuickSpecs

HP EliteBook 8540w Mobile Workstation

Technical Specifications

Modulation	Direct Sequence Spread Spectrum
	DBPSK, DQPSK, CCK, OFDM, BPSK, QPSK, 16-QAM, 64-QAM
Security1	Authentication: WPA and WPA2, 802.1x (EAP_TLS, TTLS, PEAP,
	LEAP, EAP-FAST)
	Authentication Protocols: PAP, CHAP, TLS, GTC, MS-CHAP, MS-
	CHAPv2
	Encryption: 64 and 128-bit WEP, AES-CCMP, CKIP, TKIP
	Support for Cisco Security Features (proven compatibility with Cisco
	Aironet infrastructure products through the Cisco Compatible
	Extensions Program Version 4) with Microsoft Windows Vista and XP
	only.
Sub-channels	Multinational support with frequency bands and channels compliant to
	local regulations.
Media Access Protocol CSMA/CA (Collision Avoidance) with ACK
Network Architecture	Ad-hoc (Peer to Peer)
Models	Infrastructure (Access Point Required)
Roaming	IEEE 802.11 compliant roaming between 2.4GHz band Access Points

Output Power (for CCK 17 dBm max and OFDM)2

Power Consumption	Transmit: 2.3 Watts (max, with two spatial streams)
	Receive: 1 Watt (max with two spatial streams)
	Idle mode3: 35 mW (average)
	Radio off: 20 mW (max)
Power Management	ACPI compliant power management
	802.11 compliant power saving mode
Receiver Sensitivity4	54 Mbps: -76 dBm, 6 Mbps: -92 dBm
Antenna Connections	2 U.FL type connectors, 50 ohm nominal impedance
Form Factor	PCI-Express Half-MiniCard
Weight	0.0075 lb (3.4 g)
Dimensions	0.12 x 1.06 x 1.18 in (3.1 x 26.8 x 30.0 mm)
Operating Voltage	3.3V +/- 9%
Temperature	Operating	32° to 176° F (0° to 80° C)
	Non-operating	-40° to 176° F (-40° to 80° C)
Humidity	Operating	10% to 90% (non-condensing)
	Non-operating	5% to 90% (non-condensing)
Altitude	Operating	0 to 10,000 ft (3,048 m)
	Non-operating	0 to 50,000 ft (15,240 m)
LED Activity	LED Off - Radio OFF; Solid LED On - Radio ON

1.Check latest software/driver release for updates on supported security features.

2.Maximum output power may vary by country according to local regulations.

3.In Power Save Polling mode and on battery power.

4.Receiver sensitivity is measured at a packet error rate of 8% for 802.11b (CCK modulation) and a packet error rate of 10% for 802.11a/g (OFDM modulation).

5.WLAN supplier's client utility is required for Cisco Compatible Extensions support with Microsoft Windows XP. WLAN may also be compatible with certain third-party software supplicants. WLAN supplier IHV extensions required for Cisco Compatible Extensions support for Microsoft Windows Vista.

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