User's Manual

38 Site planning and hardware deployment

• A DAP or a handset interferes with sensitive laboratory equipment

and medical equipment (for example, ensure that DAPs are installed

outside of an operating room at an hospital.)

•

Ensure that significant interference from unsuppressed engines or

electric motors is accounted for.

Trafﬁc density calculations

Perform the traffic density calculations so that you have a low blocking

probability in the system.

For traffic calculations, you must know

• the number of users

•

the type of users

The following table lists the three user types.

Table 3

Three user types

Traffic Application Erlang/User

Low normal offices

0.05

Average Executive and secretary

groups

0.1-0.15

High help desks, Tele-services

0.2-0.25

The Erlang value for DAP C4710 and C4710E (12 radio channels), with

blocking probability of 0.5%, is 5.25.

Calculate the traffic density using the following formula:

One cell has 20 users: five average traffic and 15 low traffic. The load is:

(5 x 0.15) + (15 x 0.05) = 1.5 Erlang

Therefore, one 12 channel DAP is sufficient for this cell.

System deployment

This section describes the basics of SIP DECT system deployment.

DECT Deployment Kit 2

The DECT Deployment Tool (deployment tool) determines cell centers and

cell boundaries.

Nortel Communication Server 1000

SIP DECT Fundamentals

NN43120-123 02.02 30 March 2010