Voic 802 11e over phần 2 pps

... stops and then enters into a random back-off procedure (Figure 2. 3). This prevents 18 Voice over 8 02. 11 16 Voice over 8 02. 11 Table 2. 2 (continued) Mac Service Description Station Type Disassociation ... tak - ing a structured view of the 8 02. 11 parameters. The formal specification of the 8 02. 11 MIB is Annex D of the 8 02. 11 specification. The 8 02. 11 MIB was desi...

Ngày tải lên: 14/08/2014, 06:22

... 97 2. 3900 2. 4500 Part 15 2. 4000 2. 4830 Fusion lighting 2. 4000 2. 4835 Part 18 2. 4000 2. 5000 Part 80 2. 4000 9.6000 ISM 8 02. 11b 2. 4010 2. 4730 Part 74 2. 4500 2. 4835 Part 101 2. 4500 2. 5000 Part 90 2. 4500 ... throughout the building to ensure optimal coverage. Economics of Vo8 02. 11 Networks 22 1 14 Economics of Vo8 02. 11 Networks Why deploy a Vo8 02. 11 networ...

Ngày tải lên: 14/08/2014, 06:22

... access 12 Voice over 8 02. 11 Interoffice Telephony 22 8 Enterprise Conclusion 22 8 Lower Barrier to Entry 22 9 Considerations in Bypassing the PSTN with Vo8 02. 11 22 9 Conclusion 23 0 References 23 1 15 ... VoIP 21 4 Conclusion 21 5 References 21 6 14 Economics of Vo8 02. 11 Networks 21 7 Vo8 02. 11 Works: Case Studies 21 7 Medical 21 7 Education 21 9 Financial Services...

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. 125 4.8 Waveform G. 721 G. 723 G. 726 16, 24 , 32, 40 0. 125 4 .2 G. 728 16 2. 5 4 .2 G. 729 8 10 4 .2 G. 723 .1 ... Camarillo, G., SIP Demystified, New York: McGraw-Hill, 20 02. [7] Collins, D., Carrier Grade Voice over IP, 2nd ed., New York: McGraw-Hill, 20 02. Voice over...

Ngày tải lên: 14/08/2014, 06:22

... power, the range of 8 02. 11 is extended to tens of miles [1]. 78 Voice over 8 02. 11 VoIP media g atewa y PSTN IP network Softswitch 8 02. 11a/b/g Vo8 02. 11 PDA Vo8 02. 11 phone Vo8 02. 11 laptop Wireless ... connection between a local telephone switch and a subscriber. WLL 88 Voice over 8 02. 11 WLAN 8 02. 11b WWAN 8 02. 11a WMAN 8 02. 16 Figure 6.3 Covering a metropolita...

Ngày tải lên: 14/08/2014, 06:22

... performance and 120 Voice over 8 02. 11 1 12 Voice over 8 02. 11 Access point Vo8 02. 11 p hones ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Internet Router IP phones IP-PBX DMZ server Firewall Hub Figure 7. 12 Wireless ... starts at 0 again. 1 02 Voice over 8 02. 11 8 02. 11 access pointVo8 02. 11 phone ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Intr ude r Figure 7 .2 Interception in a network....

Ngày tải lên: 14/08/2014, 06:22

... Vo8 02. 11 Wireless Networks 133 Table 8 .2 The 11 Overlapping 8 02. 11b Channels Channel Frequency (GHz) 1 2. 4 12 2 2. 417 3 2. 422 4 2. 427 5 2. 4 32 6 2. 437 7 2. 4 42 8 2. 447 9 2. 4 52 10 2. 457 11 2. 4 62 Source: [2] . is ... work with all possible 8 02. 11 physical layers (original 8 02. 11, 8 02. 11, 8 02. 11a, and 8 02. 11g). The following sections de...

Ngày tải lên: 14/08/2014, 06:22

... and middle 8 02. 11a bands and 20 MHz for the upper U-NII band (Figure 10.5). 176 Voice over 8 02. 11 8 02. 11 phone 2. 700 GHz 2. 400 GHz 2. 500 GHz 2. 600 GHz Access p oint Figure 10.3 The 2. 4-GHz band ... best Engineering Vo8 02. 11 Networks for Maximum QoS 161 Which 8 02. 11 Protocols Are Best for Which Vo8 02. 11 Applications? Four primary standards-based protocols are c...

Ngày tải lên: 14/08/2014, 06:22

... dBm or 0 .25 W. 20 8 Voice over 8 02. 11 13 Regulatory Considerations for Vo8 02. 11 Networks An objection often raised about Vo8 02. 11 applications is that because the spec- trum used by 8 02. 11 (2. 4 GHz ... use of Vo8 02. 11 as a means of bypassing incumbent telephone service providers. Current Regulatory Environment for 8 02. 11 The Vo8 02. 11 specification is VoIP over 8 02...

Ngày tải lên: 14/08/2014, 06:22

... 116–17 IEEE 8 02. 11 8 02. 11a, 173 8 02. 11b, 23 , 173 8 02. 11e, 150 8 02. 11g, 173–74 architecture, 19 23 BSS, 14, 19, 20 carrier multiplexing, 13 components, 21 22 conclusion, 23 24 DCF, 18 DSSS, 11 ESS, 21 external ... multiple-access/collision avoidance (CSMA/CA), 14, 19 Case studies, 21 7 23 education, 21 9 21 financial services, 22 1 22 manufacturing and war...

Ngày tải lên: 14/08/2014, 06:22