As you want to know about the DTU GSM the details as under:

DTU

GAE – GPRS Modem/ Data Transmission Unit is an perfect solution for automation, remote monitoring and device management for M2M industry.

This DTU works on public GSM/GPRS cellular network.

Features

Remote monitoring of interfaced peripherals / devices
Bidirectional communication
Over the Air configuration capacity
Up to 10 different mobile numbers can be pre-set in the system
Password protected, prevents un-authorized configuration of the system
May be set up and programmed from any GSM phone and PC.
Time stamped alarm messages by SMS, Emails etc.,
TCP/IP protocol stack support
Accepts a standard SIM card
Works on Public GSM network (Tri-band GSM 900/1800/1900MHz)
Supports all GPRS APN
LED indications
RS 485, RS 232 and mini USB interfaces

Applications

All M2M Applications
Water Telemetry
Automated Meter Reading
For remote monitoring and management of any device with suitable Interface

Types of DTU

2400-DTU-RS232RS485-4LED
2401-DTU-RS232RS485-10LED-LPLATE
2402-DTU-USB
2403-DTU-Ethernet
2404-DTU-RS232
2405-DTU-RS232RS485USB
2406-DTU-BATIP67-WATER
2407-DTU-WM-LCD-ADC-PFC
2408-DTU-RS232RS485-10LED-ENCLOSURE