1 unstable release
0.9.0-rc.1 | Oct 12, 2024 |
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#706 in Network programming
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Erlang E1 Channel Calculator
This Rust library provides functionality to calculate the number of E1 voice channels required to meet a specific blocking probability using the Erlang B formula. It is commonly used in telecommunications to determine the number of channels needed based on system traffic and user load.
Features
- Erlang B Calculation: Calculate the blocking probability based on traffic (in Erlangs) and the number of available communication channels.
- E1 Channel Calculation: Compute the number of E1 voice channels required to meet a desired blocking probability.
- Helper Functions: Convert high-level user inputs such as the number of users, average call duration, and concurrent calls into Erlangs and perform the channel calculation.
Then import the library into your project:
extern crate erlang_e1;
Usage
Calculating Blocking Probability You can calculate the blocking probability for a given traffic load and number of channels using the Erlang B formula:
use erlang_e1::erlang_b;
fn main() {
let traffic = 15.0; // in Erlangs
let channels = 10;
let blocking_probability = erlang_b(traffic, channels);
println!("Blocking Probability: {:.5}", blocking_probability);
}
Calculating Required E1 Channels If you already have the traffic (in Erlangs), you can calculate the number of E1 channels needed for a desired blocking probability:
use erlang_e1::calculate_e1_channels;
fn main() {
let traffic = 20.0; // in Erlangs
let blocking_probability = 0.05; // 5% blocking probability
let max_channels = 10000; // optional upper limit for search
match calculate_e1_channels(traffic, blocking_probability, max_channels) {
Some(channels) => println!("Required channels: {}", channels),
None => println!("No suitable number of channels found within the limit."),
}
}
High-Level Calculation with User Inputs If you have high-level inputs like the number of users and average call duration, you can use the required_e1_channels function to calculate the number of channels:
use erlang_e1::required_e1_channels;
fn main() {
let users = 100;
let average_call_duration = 3.0; // in minutes
let concurrent_calls = 10;
let blocking_probability = 0.05;
match required_e1_channels(users, average_call_duration, concurrent_calls, blocking_probability) {
Some(channels) => println!("Required channels: {}", channels),
None => println!("No suitable number of channels found within the limit."),
}
}
Explanation Erlang B Formula: This formula is used to calculate the probability of all channels being occupied (blocking probability) in a system with N channels and a given traffic load in Erlangs. E1 Channels: In telecommunications, an E1 line consists of 30 voice channels. This library helps calculate the number of E1 lines required to satisfy the traffic and blocking probability requirements.