Voic 802 11e over phần 9 ppsx

... which the government outsources for their frequency coordination. Amateur Radio—Part 97 Amateur radio frequencies that overlap 802. 11b are 2. 390 to 2.450 GHz and 5.650 to 5 .92 5 GHz for 802. 11a. ... The Vo802.11 market is validated by the presence of telecommunications vendor industry giants Cisco, 230 Voice over 802. 11 Table 14 .9 Cost Comparisons to Deploy a Cell Phone, PSTN, o...

Ngày tải lên: 14/08/2014, 06:22

... 190 Conclusion 192 References 192 12 Vo802.11 Features and Applications 193 Features in the Legacy PSTN 194 Features and Signaling 194 SCE 195 APIs 196 APIs and Services 196 XML 197 SIP: Architecture ... Softswitched Vo802.11 Networks 197 Media Servers 198 Application Servers 198 Architecture 199 Interface Between Call Control and Application Server 199 Application Server Inter...

Ngày tải lên: 14/08/2014, 06:22

... an AP can associate with multiple stations. AP 3 Voice over Internet Protocol What Is VoIP? Voice over 802. 11 is voice over IP used to transport voice over wireless Ethernet. Many books about VoIP ... 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 Description Station Typ...

Ngày tải lên: 14/08/2014, 06:22

... Protocol,” white paper, June 199 9, http://www. cisco.com. [13] Cisco Systems, “Resource Reservation Protocol,” white paper, June 199 9, http://www. ciscosystems.com. 48 Voice over 802. 11 Switching in IP ... trunk side of the PBX. The T1 trunks 64 Voice over 802. 11 [8] Internet Engineering Task Force, “Media Gateway Control Protocol,” RFC 2705, Octo - ber 199 9. [9] http://www.nuera....

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. 11a/b/g Vo802.11 PDA Vo802.11 phone Vo802.11 laptop Wireless ... connection between a local telephone switch and a subscriber. WLL 88 Voice over 802. 11 WLAN 802. 11b WWAN 802. 11a WMAN 802. 16 Figure 6.3 Covering a metropolitan area with WMANs, W...

Ngày tải lên: 14/08/2014, 06:22

... be encrypted and authenticated as well as meet strict performance and 120 Voice over 802. 11 112 Voice over 802. 11 Access point Vo802.11 p hones ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Internet Router IP phones IP-PBX ... computer systems inaccessible by overloading Security and Vo802.11 1 09 802. 11 access pointVo802.11 phone ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ ❘❙❚ Intr ude r Figure 7 .9 Example o...

Ngày tải lên: 14/08/2014, 06:22

... work with all possible 802. 11 physical layers (original 802. 11, 802. 11, 802. 11a, and 802. 11g). The following sections describe QoS efforts in 802. 11 and the mechanisms in 802. 11e that are designed ... QoS on Vo802.11 Wireless Networks 135 Base station Subscriber Figure 8.2 Multipath interference. ( From: [7]. © 199 9 Cisco Systems, Inc. Reprinted with per - mission.) 150 Voice...

Ngày tải lên: 14/08/2014, 06:22

... Com - munications Review, April 199 9, pp. 16–22. [5] White Paper: IP Voice Services, Report to Congress on Universal Service, CC Docket No. 96 -45, March 18, 199 8, http://www.von.org/docs/whitepap.pdf. [6] ... Wireless,” Cisco Systems, 199 9. [8] Zyren, J., and A. Petrick, “Tutorial on Basic Link Budget Analysis,” Intersil white paper, June 199 8, http://www.intersil.com. [9] Bandeira, N....

Ngày tải lên: 14/08/2014, 06:22

... used to determine overall estimated availability is then (0 .99 999 62) × (0 .99 999 93) or 99 .99 955% [6]. Vo802.11 Reliability 191 Vo802.11 Networks and E911 and CALEA Requirements E911 One obstacle ... 24 hours per day, seven days per week. Overall power availability using the above suggestions is estimated to be 99 .99 962%. This impacts overall availability, 99 .99 993 %, in the sam...

Ngày tải lên: 14/08/2014, 06:22

... 52–54 Voice over 802. 11. See Vo802.11 Voice over Internet Protocol. See VoIP Voice quality detractors, 157–60 dropped packets and, 1 59 jitter and, 1 59 60 latency and, 157– 59 measuring, 156–57 Voice ... (MGCP), 39 40 call control architecture, 39 defined, 39 purpose, 39 in softswitch architecture, 40 Media gateways, 63–64 Media servers, 198 defined, 198 functions of, 198 Medi...

Ngày tải lên: 14/08/2014, 06:22