• Dimensions: 45 x 40 x 20 mm (L x W x H)
• Weight: 70 g
• Power supply via USB
• Power consumption:
  
  • Idle mode 30 mA
  • Speech mode 200 mA (average), 450mA (peak)
  • GPRS (class 8) 200mA (average), 450mA (peak)
  • GPRS (class 10) 320 mA (average), 700mA (peak)
  • Inrush current 900mA
• Temperature range:
  
  • Normal operation -20°C to +55°C
  • Restr. operation -25°C to +70°C
  • Storage -40°C to +70°C

• 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)

• Quad-band GSM-R / EGSM 900 / GSM 1800 / GSM 1900
• GSM Phase 2 / Phase 2+
• GPRS multi-slot class 10
• Mobile station class B
• Output power
  
  • Class 4 (2 W) for GSM-R / EGSM 900
  • Class 1 (1 W) for GSM 1800 / GSM 1900
• Control with AT commands via virtual COM-Port (USB CDC ACM interface)
• SIM Application Toolkit

• GPRS class 10 max. 86 kbps (downlink)
• PBCCH support
• Coding scheme CS 1-4
• CSD data transmission
  
  • Up to 14.4 kbps
  • USSD
  • Non transparent mode
  • V.110
• PPP stack for GPRS data transfer
• Fax group 3, class 2
• TCP/IP stack access via AT command protocols:
• TCP, UDP, HTTP, FTP, SMTP, POP3

• Triple-rate for HR, FR, EFR
• Adaptive multi-rate (AMR)
• Hands-free operation
• Noise reduction and echo cancellation

• Point-to-point MO and MT
• SMS cell broadcast
• Text and PDU mode

• USB Interface (USB Mini B connector)
• AT commands via USB CDC ACM interface
• Digital audio via USB
• Voltage supply via USB
• Antenna connector (SMA)
• Indication LED
• Miniature SIM card holder

The TRM-3aT USB can be easily and ad hoc applied for GSM-R data and voice terminal or modem solutions within PC, notebook or other process computing environment.