Narrowband ISDN

The first generation of ISDN is called as a narrowband ISDN and it is based on the use of 64 kbps channel as the basic unit of switching and has a circuit switching orientation. The main device in the narrowband ISDN is the frame relay. The second generation of ISDN is referred to as the broadband ISDN (B-ISDN).

Trunk in networking

Trunk

Trunk (Branches between exchanges) in networking is links which enables to connect many clients from a network through sharing a medium or wire frequency we can take example of tree for better understand of trunk.
Tree has a root and many branches whose fulfill their requirement from root.

A trunk is a single transmission channel between two points, each point being either the switching center or the node.

Telephone Local Loop

What is a 'Local Loop'?

The Local Loop in a telephone network (sometimes referred to as the "last mile" of the network) is
the bit that connects your home to your local telephone exchange. It refers literally to the copper
cables that run from your home to the telephone exchange.

Dynamic Array in PHP

     The array is a collection of similar data types which occupies continuous location in memory. There are two types of array static and dynamic. In dynamic array size can be decreased and increase as requirement which best uses of memory utilization on the other hand static array is fixed in nature you cannot increase and decrease array capacity when require so it’s not popular in PHP. We deal with mostly dynamic array in PHP.

Dynamic Array example code :

<?php

$ar=array("Red","Green","Blue");

for($i=0;$i<count($ar);$i++)

{

echo  "<br>" . ($i+1) . "'st element value " . $ar[$i];

}

?>

Example 2:

$ar[]="";
for ($i = 0; $i <$10; $i++)
{
array_push($ar,$i);
}

for($i=0;$i<count($ar);$i++)
echo "<h2>" . $ar[$i] . "</h2>";