|
Read
an Erlang Table
Erlang
traffic tables show the load - in Erlangs - a trunk group of
a given number of trunks (N), can handle at 1%, 2%, and 5% grades
of service. To find how many trunks are needed to meet a specified
GOS, you must know the anticipated load during the peak busy hour.
Once you know this, use the column corresponding to the GOS to find
the required number of trunks.
Example
A cell is to have a load of 10 Erlangs with a GOS of 2%.
The Erlang Traffic Tables show that 16 trunks are required.
(Find the next highest and round down).
The
Full Erlang B Table
ERLANG-B CAPACITY TABLE
Voice Channels Needed to Serve Offered Traffic Load for 2% Blocking
|
Voice
Channels
Needed |
Engineered
Traffic
Capacity |
Voice
Channels
Needed |
Engineered
Traffic
Capacity |
Voice
Channels
Needed |
Engineered
Traffic
Capacity |
| 1 |
0.020 |
31 |
22.827 |
61 |
50.389 |
| 3 |
0.602 |
33 |
24.628 |
63 |
52.461 |
| 5 |
1.657 |
35 |
26.435 |
65 |
54.376 |
| 7 |
2.935 |
37 |
28.254 |
67 |
56.275 |
| 9 |
4.345 |
39 |
30.081 |
69 |
58.117 |
| 11 |
5.842 |
41 |
31.915 |
71 |
60.082 |
| 13 |
7.402 |
43 |
33.758 |
73 |
61.990 |
| 15 |
9.010 |
45 |
35.507 |
75 |
63.900 |
| 17 |
10.656 |
47 |
37.462 |
77 |
65.814 |
| 19 |
12.333 |
49 |
39.323 |
79 |
67.729 |
| 21 |
14.036 |
51 |
41.189 |
81 |
69.647 |
| 23 |
15.761 |
53 |
43.060 |
83 |
71.568 |
| 25 |
17.505 |
55 |
44.938 |
85 |
73.490 |
| 27 |
19.265 |
57 |
46.816 |
87 |
75.415 |
| 29 |
21.039 |
59 |
48.700 |
89 |
77.342 |
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We
recommend you print the online version now to make it easier
to understand the later sections in this module.
Continue
with System Technology vs Capacity.
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