Call usage rates
Issue 3.4.1 June 2005
157
First consider the 32 Erlangs of intercom CUR between Site 1 stations (
Table 24: Intercom COI
matrix for the Uniform Distribution model in Example 2: Uniform Distribution model
on
page 153). Site 1 (Atlanta) has a total of 1755 stations, 1107 of which are IP stations, and 648 of
which are circuit-switched stations. So, 63% of the stations in Site 1 are IP, and 37% are circuit
switched. Therefore, 63% of Site 1 intercom calls are generated by IP stations, and 63% of
those calls are terminated by IP stations. Since 63% of 63% is 39.7%, 39.7% of Site 1 intercom
calls are IP station to IP station. Similarly, 37% of the Site 1 intercom calls that are generated by
IP stations are terminated by circuit-switched stations. Since 37% of 63% is 23.3%, 23.3% of
Site 1 intercom calls are IP station to circuit-switched station.
Also, 37% of Site 1 intercom calls are generated by circuit-switched stations, and 63% of those
calls are terminated by IP stations. Since 63% of 37% is 23.3%, 23.3% of Site 1 intercom calls
are circuit-switched station to IP station. Finally, 37% of the Site 1 intercom calls that are
generated by circuit-switched stations are terminated by circuit-switched stations. Since 37% of
37% is 13.7%, 13.7% of Site 1 intercom calls are circuit-switched station to circuit-switched
station.
So, since 39.7% of Site 1 intercom calls are IP station to IP station, IP station to IP station call
usage is 39.7% of the 32 Erlangs of overall Site 1 intercom CUR, or 12.7 Erlangs. Similarly, both
the Site 1 IP station to circuit-switched station CUR and the Site 1 circuit-switched station to IP
station CUR are equal to 23.3% of 32 Erlangs, or 7.5 Erlangs. Finally, the Site 1 circuit-switched
station to circuit-switched station CUR is 13.7% of 32 Erlangs, or 4.4 Erlangs.
A similar process is used to break down the 12 Erlangs of intercom CUR into its components.
There are a total of 648 stations in Site 2 (Atlanta), 450 of which are IP stations, and 198 of
which are circuit-switched stations. So, 69% of the stations in Site 2 are IP, and 31% are
circuit-switched. We have already determined that 63% of intercom calls that are generated in
Site 1 are generated by IP stations. Similarly, 69% of intercom calls that are terminated in Site 2
are terminated by IP stations. Since 69% of 63% is 43.5%, 43.5% of Site 1 to Site 2 intercom
calls are IP station to IP station. Also, 31% of intercom calls that are terminated in Site 2 are
terminated by circuit-switched stations. Since 31% of 63% is 19.5%, 19.5% of Site 1 to Site 2
intercom calls are IP station to circuit-switched station.
Table 26: Endpoints in a three-site system
Endpoints
Atlanta
Boston
Cleveland
IP stations
1107
(1080 IP
Tele 27
Road Warriors)
450
(450 IP
Telephones)
270
(270 IP
Telephones)
Circuit-switched
stations
648
(540 DCP stations
+ 108 analog
stations)
198
(180 DCP stations
+ 18 analog
stations)
36
(36 analog stations)
PSTN trunks
120 (DS0) PSTN
Trunks
(5 T1 facilities)
48 (DS0) PSTN
Trunks
(2 T1 facilities)
24 (DS0) PSTN
Trunks
(1 T1 facility)
Содержание Application Solutions
Страница 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Страница 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Страница 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 74: ...Avaya Application Solutions platforms 74 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Страница 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 214: ...Voice quality network requirements 214 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 239: ...Reliability Issue 3 4 1 June 2005 239 Figure 69 S8700 Media Server in a high reliability configuration ...
Страница 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Страница 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 350: ...Implementing Communication Manager on a data network 350 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Страница 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...