Call usage rates
Issue 3.4.1 June 2005
159
The general formula that is used to determine the expanded intercom CUR entries in
Table 27: COI matrix for Example 4: Expanded COI matrices (intercom CUR values only)
on
page 158 is:
where:
“Type t” refers to IP or circuit-switched
Now that the intercom CURs have been determined, CURs that involve trunks will be
addressed. First, because Communication Manager systems are rarely used to route PSTN
traffic, all of the COI matrix entries that correspond to PSTN-PSTN traffic are zero. Next,
Table 22: Inbound COI matrix for the Uniform Distribution model in Example 2: Uniform
Distribution model
on page 151 and
Table 23: Outbound COI matrix for Uniform Distribution
Model in Example 2: Uniform Distribution model
on page 152 help us determine the entries that
correspond to inbound and outbound PSTN traffic.
According to
Table 22: Inbound COI matrix for the Uniform Distribution model in Example 2:
Uniform Distribution model
on page 151, the inbound PSTN usage that arrives on Site 1 trunks
and terminates at Site 1 stations is 49 Erlangs. We have already determined that 63% of the
stations in Site 1 are IP and 37% are circuit switched. Therefore, the Uniform Distribution model
implies that 63% of the 49 Erlangs (that is, 30.9 Erlangs) is inbound to Site 1 IP stations, and
37% of the 49 Erlangs (that is, 18.1 Erlangs) is inbound to Site 1 circuit-switched stations.
Similarly, the Uniform Distribution model and
Table 23: Outbound COI matrix for Uniform
Distribution Model in Example 2: Uniform Distribution model
on page 152 together imply that
63% of the 49 Erlangs of Site 1 outbound PSTN usage (that is, 30.9 Erlangs) is outbound from
Site 1 IP stations through Site 1 PTSN trunks, and 37% (that is, 18.1 Erlangs) is outbound from
Site 1 circuit-switched stations through Site 1 PTSN trunks. Note that by an assumption in
Example 2: Uniform Distribution model
, Site 1 inbound and outbound traffic only terminates and
originates at Site 1 stations. This completes the work for Site 1. Sites 2 and 3 are handled in a
similar manner, and the resulting completed COI matrix for
Example 4: Expanded COI matrices
is provided in
Table 28: Completed COI matrix for Example 4: Expanded COI matrices
on
page 160.
CUR generated by stations of type t in Site i
and terminated by stations of type t in Site j
f
i
t
f
j
t
×
intercom CUR from Site i to Site j
(
)
×
=
f
i
t
number of type t stations in Site i
total number of stations in Site i
----------------------------------------------------------------------------------
=
f
j
t
number of type t stations in Site j
total number of stations in Site j
----------------------------------------------------------------------------------
=
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 ...