Polycom SpectraLink 8000 Administration Manual page 12

SpectraLink 8000 SVP Server: Administration Guide for Mitel and Cisco
Number of
Number of
SVP
Servers
per Server
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
An 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
12
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
not linear due to the Erlang
possible installed handsets figures are approximate and meant as a
guideline and not as an absolute recommendation for any facility.
Total possible
calls installed handsets
possible @ 100% in
active calls
80 80
64 128
60 180
58 232
57 285
56 336
56 392
55 440
55 495
55 550
55 605
54 648
54 702
54 756
54 810
54 864
for additional information.
calculation for telephony traffic. The
1
Possible installed handsets
Erlang
@ 10% in
active calls active calls
65 500
111 1000
160 1500
211 2000
262 2500
312 3000
367 3500
415 4000
469 4500
524 5000
578 5500
621 6000
674 6500
728 7000
782 7500
836 8000
@ 15% in @ 20% in
active calls
433 325
740 555
1067 800
1407 1055
1747 1310
2080 1560
2447 1835
2767 2075
3127 2345
3493 2620
3853 2890
4140 3105
4493 3370
4853 3640
5213 3910
5573 4180
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