SpectraLink Corporation
Installation, Configuration, and Administration
NetLink SVP Server (within IP environments)
PN: 72-0178-01-F.doc
Page 8
the Erlang
1
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.
Possible installed handsets
Number of
SVP
Servers
Number of calls
possible
per Server
Total possible
installed handsets
@
100% in
active calls
Erlang
@
10% in
active calls
@
15% in
active calls
@
20% in
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
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
for additional information.
