ELSA Digital VSCS is the main equipment used to control voice communication. In this system hardware and software are designed using the concept of modular, network system, and online-configurable so as to facilitate installation, maintenance, expansion and operation. Voice communication control is done through a touch screen equipped with facilities to improve operating performance.

ELSA RTC PC Sync is a slave clock software that is embedded/installed on a PC/computer with Windows operating system. So the timing of the computer system will be synchronized with the UTC timing of the NAVSTAR satellites. This can be obtained by connecting a PC that has been available software ELSA RTC PC Sync with ELSA Master Clock ES - 185A.

ELSA Line Amplifier LA-101 is an amplifier/repeater for the RS485 communication cable to extend the useful data from ELSA Master Clock ES-185A to ELSA Slave Clock / RTC PC Sync.