Nortel Networks NN43001-121 manual Inputs Description

56Planning and engineering

Table 12

Inputs

Input	Description
TN_MO_Users	Total number of Office Communicator users that use the SIP Access Ports
	for voice services.
PCA_MO_Users	Number of Office Communicator users that use Personal Call Assistant (PCA).
	The PCAs required here are additional to the number of PCAs provided in the
	Enterprise Configurator (EC) tool Software screen.
P_PCA_SIP	Percentage of PCA calls that use the soft client to answer a call.

Calculations Use the following formulas to calculate traffic requirements (MO indicates Microsoft Office Communicator):

•Traffic for PCAs = (PCA_MO_Users) x (CCS per user) x (1 - P_PCA_SIP) x 10%

•Traffic for SIP ports = (TN_MO_Users - PCA_MO_Users) x (CCS per user) + (PCA_MO_Users x P_PCA_SIP) x (CCS per user)

•Total SIP Traffic = (Traffic for PCAs) + (Traffic for SIP ports)

•Number of MO SIP ports = Poisson (Total SIP Traffic) at P.01 Grade of Service

Table 13 "Traffic figures" (page 56) shows traffic in CCS and number of ports calculated based on the Poisson formula at P.01 Grade of Service.

Table 13

Traffic figures

Traffic (CCS)	Traffic (Erlang)	Number of ports
5	0.14	2
10	0.28	3
15	0.42	3
20	0.56	4
25	0.69	4
30	0.83	4
35	0.97	5
40	1.11	5
45	1.25	5
50	1.39	6
55	1.53	6
60	1.67	6
65	1.81	6

Nortel Communication Server 1000

Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007

NN43001-121 01.03 Standard

Release 5.0 30 April 2008

Copyright © 2005–2008, Nortel Networks