Attach Success Rate (Attach SR), is an important performance metric in 2G/3G networks. It indicates the reliability and efficiency of the network in handling device connections.

The attach process is the initial procedure where a mobile device registers with the 2G/3G network.

A high Attach Success Rate is desirable, as it indicates that the network is able to handle a large number of mobile devices attempting to attach.

Typically the Attach SR is calculated based on the following formula,

Attach SR = [Successful attach times / Number of attach Requests] * 100