Voic 802 11e over phần 1 docx

... Networks 14 1 QoS in 802. 11 14 3 Legacy 802. 11 MAC 14 3 DCF 14 4 PCF 14 8 Conclusion 15 3 References 15 3 9 Engineering Vo802 .11 Networks for Maximum QoS 15 5 QoS on Vo802 .11 Networks 15 5 Measuring Voice ... Range of Options 11 3 802. 11 Security Measures Beyond WEP 11 4 Wi-Fi Protected Access 11 4 802. 1x and EAP Advanced Security 11 5 x Voice over 802. 11 compl...

Ngày tải lên: 14/08/2014, 06:22

... 4.2 ITU Voice Codecs and Their Performance Standard Data Rate (Kbps) Delay (ms) MOS Codec G. 711 64 0 .12 5 4.8 Waveform G.7 21 G.723 G.726 16 , 24, 32, 40 0 .12 5 4.2 G.728 16 2.5 4.2 G.729 8 10 4.2 G.723 .1 ... are usually configured in multiples of T1 or E1 cards in a single chassis that interface with the trunk side of the PBX. The T1 trunks 64 Voice over 802. 11 [8] Internet En...

Ngày tải lên: 14/08/2014, 06:22

... performance and 12 0 Voice over 802. 11 11 2 Voice over 802. 11 Access point Vo802 .11 p hones ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Internet Router IP phones IP-PBX DMZ server Firewall Hub Figure 7 .12 Wireless ... at 0 again. 10 2 Voice over 802. 11 802. 11 access pointVo802 .11 phone ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Intr ude r Figure 7.2 Interception in a network. How Kerberos...

Ngày tải lên: 14/08/2014, 06:22

... a structured view of the 802. 11 parameters. The formal specification of the 802. 11 MIB is Annex D of the 802. 11 specification. The 802. 11 MIB was designed by the 802. 11 working group [5, p. 383]. DCF The ... and then enters into a random back-off procedure (Figure 2.3). This prevents 18 Voice over 802. 11 16 Voice over 802. 11 Table 2.2 (continued) Mac Service Descri...

Ngày tải lên: 14/08/2014, 06:22

... power, the range of 802. 11 is extended to tens of miles [1] . 78 Voice over 802. 11 VoIP media g atewa y PSTN IP network Softswitch 802. 11 a/b/g Vo802 .11 PDA Vo802 .11 phone Vo802 .11 laptop Wireless ... to point. The rollout of the 802. 16 MAN protocol allows the extension of 802. 11 b and associated wireless protocols over a wide geographic area. By 94 Voice over 802...

Ngày tải lên: 14/08/2014, 06:22

... work with all possible 802. 11 physical layers (original 802. 11 , 802. 11 , 802. 11 a, and 802. 11 g). The following sections describe QoS efforts in 802. 11 and the mechanisms in 802. 11 e that are designed ... recently approved 802. 11 e, which is backward compatible with other variants of 802. 11 , which means that improvements in QoS contained in 802. 11 e can be...

Ngày tải lên: 14/08/2014, 06:22

... Vo802 .11 Networks for Maximum QoS 16 1 Which 802. 11 Protocols Are Best for Which Vo802 .11 Applications? Four primary standards-based protocols are currently available: 802. 11 , 802. 11 b, 802. 11 a, ... Networks 17 7 1 1 1 6 6 6 11 11 11 Figure 10 .4 A 3-to -1 reuse pattern. ( From: [3]. © 2002 Neeli Prasad and Anand Prasad. Reprinted with permission.) 802. 11 phone...

Ngày tải lên: 14/08/2014, 06:22

... 0.25W. 208 Voice over 802. 11 13 Regulatory Considerations for Vo802 .11 Networks An objection often raised about Vo802 .11 applications is that because the spec- trum used by 802. 11 (2.4 GHz for 802. 11 b ... use of Vo802 .11 as a means of bypassing incumbent telephone service providers. Current Regulatory Environment for 802. 11 The Vo802 .11 specification is VoIP over 802...

Ngày tải lên: 14/08/2014, 06:22

... legally operating Part 15 users. Table 13 .2 lists the 802. 11 b spectrum bands. This is stated in Part 15 .5 (b) and (c). 210 Voice over 802. 11 Table 13 .1 Spectrum Allocation for 802. 11 and Cousers Part/Use Starting Gigahertz Ending Gigahertz Part ... throughout the building to ensure optimal coverage. Economics of Vo802 .11 Networks 2 21 14 Economics of Vo802 .11 Networks...

Ngày tải lên: 14/08/2014, 06:22

... authenticators, 11 8 encapsulation and, 11 7 integration, 11 7 network port authentication and, 11 6 17 IEEE 802. 11 802. 11 a, 17 3 802. 11 b, 23, 17 3 802. 11 e, 15 0 802. 11 g, 17 3–74 architecture, 19 –23 BSS, 14 , 19 , ... 50–52 QPSK, 11 Quality of service (QoS), 77–78, 79 in 802. 11 , 14 3 factors affecting, 16 0 importance on 802. 11 networks, 14 0– 41...

Ngày tải lên: 14/08/2014, 06:22