# Blog

## What is Erlang X?

Erlang X seems to be similar to Erlang A As far as I can see Erlang X seems to be very similar to Erlang A. I have not yet seen an example of the Erlang X formula so it is difficult to say. Erlang A (the A stands for abandons) formula is an externsion of Erlang C and was developed by Conny Palm in 1946.

## What is the Erlang formula?

To work out the traffic intensity, take the call minutes and divide by 60 to get the number of call hours. So, 600 call minutes / 60 = 10 Call Hours. Now the technical unit for Call Hours is called an Erlang. So the traffic intensity = 10 Call Hours = 10 Erlangs.Jan 10, 2018

## How do I use Erlang in Excel?

To get the Erlang Calculator to work you will need to have macros enabled on your computer. In Excel select Tools > Options > Security > Macro Security and then select Medium. You can then “Enable macro” when you open the spreadsheet.Jun 7, 2017

## Is Elixir better than erlang?

You are building a large, distributed, and high-availability web app: Both Elixir and Erlang support concurrency and fault tolerance. However, Elixir fares better than Erlang in this regard. ... It supports concurrency without any notable degradation of performance.Jun 16, 2020

## What is an erlang in telecom?

The erlang is a unit of traffic density in a telecommunications system. One erlang is the equivalent of one call (including call attempts and holding time) in a specific channel for 3600 seconds in an hour. The 3600 seconds need not be, and generally are not, in a contiguous block.

## What is Erlang B and C?

Erlang Calculations

Erlang-B should be used when failure to get a free resource results in the customer being denied service. The customers request is rejected as no free resources are available. Erlang-C should be used when failure to get a free resource results in the customer being added into a queue.

## What is Erlang in call center?

Erlang C is a traffic modeling formula used in call center scheduling to calculate delays or predict waiting times for callers. Erlang C bases its formula on three factors: the number of reps providing service; the number of callers waiting; and the average amount of time it takes to serve each caller.

## What is the difference between agents and fractional agents?

Agents - calculate the number of agents required to achieve a SLA target. ... Fractional Call Capacity - the maximum number of calls that can be handled. Queued - the percentage of calls which will be queued. Queue Size - average number of calls queuing.

## Why is Erlang not popular?

One reason Erlang may be declining is because of newer functional programming languages, such as Elixir or Elm. Although Erlang is certainly useful, it's less accessible for beginners.Dec 26, 2019

## Does WhatsApp still use Erlang?

WhatsApp used to use Erlang, not anymore. Facebook rewrote it completely in C++. https://www.quora.com/When-did-Facebook-switch-away-from-usi... That system was the backend of the functionality currently known as Facebook Messenger, not WhatsApp. ... > after freezing development of an Erlang-based messaging system...

### Is WhatsApp still using Erlang?

WhatsApp server is almost completely implemented in Erlang as it was suitable for accommodating huge communication system with high sustainability. Ejabberd is a famous open source Jabber server written in Erlang. Server systems that do the backend message routing are done in Erlang.

### What is Erlang distribution in statistics?

• The Erlang distribution is the distribution of the sum of k independent and identically distributed random variables, each having an exponential distribution. The long-run rate at which events occur is the reciprocal of the expectation of λ / k . {\\displaystyle \\lambda /k.}

### What is Erlang-B and Erlang C used for?

• This can be used to determine the probability of packet loss or delay, according to various assumptions made about whether blocked calls are aborted (Erlang B formula) or queued until served (Erlang C formula). The Erlang-B and C formulae are still in everyday use for traffic modeling for applications such as the design of call centers .

### Is there an asymptotic expansion of the median of an Erlang distribution?

• An asymptotic expansion is known for the median of an Erlang distribution, for which coefficients can be computed and bounds are known. An approximation is

### Are event events Erlang distributed or Poisson distributed?

• Events that occur independently with some average rate are modeled with a Poisson process. The waiting times between k occurrences of the event are Erlang distributed. (The related question of the number of events in a given amount of time is described by the Poisson distribution .)

### What is Erlang distribution in statistics?What is Erlang distribution in statistics?

The Erlang distribution is the distribution of the sum of k independent and identically distributed random variables, each having an exponential distribution. The long-run rate at which events occur is the reciprocal of the expectation of λ / k . {\displaystyle \lambda /k.}

### What is Erlang-B and Erlang C used for?What is Erlang-B and Erlang C used for?

This can be used to determine the probability of packet loss or delay, according to various assumptions made about whether blocked calls are aborted (Erlang B formula) or queued until served (Erlang C formula). The Erlang-B and C formulae are still in everyday use for traffic modeling for applications such as the design of call centers .

### What version of Erlang do I need for my application?What version of Erlang do I need for my application?

Erlang 22.x is recommended. As a rule of thumb, most recent minor & patch versions of each supported Erlang/OTP series is recommended. Most recent versions can be obtained from a number of sources:

### What RPM packages are available for Erlang/OTP?What RPM packages are available for Erlang/OTP?

There are multiple RPM packages available for Erlang/OTP. The recommended option is the zero-dependency Erlang RPM from the RabbitMQ team. It closely follows the latest Erlang/OTP patch release schedule. See CentOS, RHEL and Fedora installation guide for more information on the available options.