Contents
Network Effectiveness Ratio (NER)
ASR gives the relationship between the number of seizures that result in
an answer signal and the
total number of seizures. This is a direct measure of the effectiveness
of the service being offered and is usually expressed as a percentage as
follows:
Measurement of ASR may be made on a route or on a destination code
basis.
AHT is a
metric for the average duration of one transaction, typically
measured from the customer's initiation of the call and including any
hold time, talk time and related tasks that follow the
transaction.
NER is designed to express the ability of networks to deliver calls to
the far-end terminal. NER expresses the relationship between the number
of seizures and the sum of the number of seizures resulting in either an
answer signal, or a user busy, or a ring no answer, or in the case of
ISDN a terminal rejection/unavailability. Unlike ASR, NER excludes the
effects of customer behavior and terminal behavior.
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.
For example, if a group of user made 30 calls in one hour, and each call
had an average call duration of 5 minutes, then the number of Erlangs
this represents is worked out as follows:
Minutes of traffic in the hour |
= |
number of calls x duration |
Minutes of traffic in the hour |
= |
30 x 5 |
Minutes of traffic in the hour |
= |
150 |
Hours of traffic in the hour |
= |
150 / 60 |
Hours of traffic in the hour |
= |
2.5 |
Traffic figure |
= |
2.5 Erlangs |
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.
The main Erlang traffic model are listed below, with links to the free
online calculators on this Web site:
Blocking
is the failure of calls due to an insufficient number of lines being
available. E.g. 0.02 mean 2 calls blocked per 100 calls attempted.
·
Erlang Loading Factor:
Usually we use a multiplier instead of Erlang B or C methods. This
multiplier is called Erlang Loading Factor.
Use the following formula to
calculate the Erlang value:
Traffic in Erlangs = (Number of
calls in the busy hour * AHT in sec) / 3600 sec
The number of call attempts in
the busy hour is called Busy Hour Call Attempts (BHCA)
In the standard business environment, the busy
hour of any given day accounts for approximately 15 to 20 percent of the
traffic for that day.
·
BHCA=CAPS*60*60
·
CPS = (Total Ports
x Erlang loading) / (ASR x AHT)
AHT is in sec
Online Erlang Calculators
https://www.cas.mcmaster.ca/~qiao/publications/erlang/newerlang.html
http://www.jungar.net/apps/erlangb/
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