Voic 802 11e over phần 9 ppsx
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...
Voic 802.11e over phần 1 docx
... 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...
Voic 802.11e over phần 2 pps
... 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...
Voic 802.11e over phần 3 docx
... 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....
Voic 802.11e over phần 4 pdf
... 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...
Voic 802.11e over phần 5 docx
... 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...
Voic 802.11e over phần 6 ppt
... 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...
Voic 802.11e over phần 7 doc
... 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....
Voic 802.11e over phần 8 pdf
... 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...
Voic 802.11e over phần 10 pot
... 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...