Svp

SpectraLink Corporation	Installation, Configuration, and Administration
	NetLink SVP Server (within IP environments)

the Erlang1 calculation for telephony traffic. The possible installed handsets figures are approximate and meant as a guideline and not as an absolute recommendation for any facility.

Number of	Number of calls	Total possible		Possible installed handsets
		installed handsets		@		@		@
		installed handsets
SVP	possible	@	Erlang
Servers	per Server	100% in		10% in		15% in		20% in
		active calls		active calls		active calls		active calls

1	80	80	65	500	433		325
2	64	128	111	1000	740		555
3	60	180	160	1500	1067		800
4	58	232	211	2000	1407		1055
5	57	285	262	2500	1747		1310
6	56	336	312	3000	2080		1560
7	56	392	367	3500	2447		1835
8	55	440	415	4000	2767		2075
9	55	495	469	4500	3127		2345
10	55	550	524	5000	3493		2620
11	55	605	578	5500	3853		2890
12	54	648	621	6000	4140		3105
13	54	702	674	6500	4493		3370
14	54	756	728	7000	4853		3640
15	54	810	782	7500	5213		3910
16	54	864	836	8000	5573		4180

1An Erlang is a unit of telecommunications traffic measurement. Strictly speaking, an Erlang represents the continuous use of one voice path. In practice, it is used to describe the total traffic volume of one hour.

Erlang traffic measurements are made in order to help telecommunications network designers understand traffic patterns within their voice networks. This is essential if they are to successfully design their network topology and establish the necessary trunk group sizes.

Erlang traffic measurements or estimates can be used to work out how many lines are required between a telephone system and a central office (PSTN exchange lines), or between multiple network locations.

Please visit www.erlang.com for additional information.

PN: 72-0178-01-F.doc

Page 8

8000

5573

4180