For the TRM-3a module the approved module TRM-3 has been extended by subsequent ASCI and EIRENE features

• VGCS (Voice Group Call Service)
• VBS (Voice Broadcast Service)
• UUS1 (User-to-User Signalling type 1)
• eMLPP (Enhanced Multi-Level Precedence and Preemption)

• FN supported (Functional Number)
• PFN supported (Presentation Functional Number)
• REC (Railway Emergency Call)

• Dimensions 35 x 32.5 x 2.95 mm (L x W x H)
• Weight 5.5 g
• Supply voltage range 3.3...4.8 V
• Power consumption:
  • Power down 50 μA
  • Sleep mode 3.0 mA (DRX=5)
  • Idle mode 15 mA
  • Speech mode 260 mA (average),
  • GPRS (class 10) 450 mA (average)
  • Peak 2 A
• Temperature range:
  • Normal operation: -20°C to +70°C
  • Restricted operation: -40°C to +70°C
  • Storage: -40°C to +85°C
• Interfaces:
  • Interface to external SIM
  • Board-to-board connector
  • Digital and analog audio interfaces
  • Two serial interfaces
  • Power supply 3.3 ... 4.8 V
  • Antenna connector and antenna solder pad
  • Battery charger

• Quad-band GSM-R / EGSM 900 / GSM 1800 / GSM 1900
• GSM Phase 2 / Phase 2+
• Output power:
  • Class 4 (2 W) at GSM-R / EGSM900
  • Class 1 (1 W) at GSM1800 / GSM 1900
• GPRS multi-slot class 10
  Mobile station class B
  PBCCH support
  Coding scheme CS 1- 4
• CSD data transmission
  • up to 14.4 kbps;
  • USSD
  • Non transparent mode: V.110
• Fax: Group 3, Class 2
• TCP/IP stack access via AT command
• Internet services: TCP, UDP, HTTP, FTP, SMTP, POP3
• AT commands via serial interface
• SIM Application Toolkit