Traffic engineering

Additional design criteria

Each site is to have a suitable number of PSTN trunks (which terminate on PNs in Atlanta and Boston, and on the G350 Media Gateways in Cleveland).

This is a general business application (for example, no Call Center agents), where the average usage per station is assumed to be 0.11 Erlangs, and the average call duration is assumed to be 200 seconds.

Each site consists of a single Network Region, and all three Network Regions are interconnected in the sense of the IRCM matrix.

One-third of all calls are intercom calls (that is, calls between two stations), one-third are inbound PSTN trunk calls, and one-third are outbound PSTN trunk calls.

Preliminary calculations

Based on the assumption of 0.11 Erlangs per station, Table 24: Example 1 station usage by endpoint type on page 182 shows the total station usage for each station category in the system.

Table 24: Example 1 station usage by endpoint type

Endpoints

 

Atlanta

Boston

Cleveland

 

 

(Erlangs)

(Erlangs)

(Erlangs)

 

 

 

 

 

DCP Telephones

 

60

20

 

 

 

 

 

 

IP Telephones

 

120

50

30

 

 

 

 

 

Analog stations

 

12

2

 

 

 

 

 

 

Road Warriors

 

3

 

 

 

 

 

 

 

Analog stations administered

 

 

 

4

to G350 Media Gateways

 

 

 

 

 

 

 

 

 

182 Avaya Application Solutions IP Telephony Deployment Guide

Page 182
Image 182
Avaya 555-245-600 manual Additional design criteria, Preliminary calculations