FO-4E1T1-GE carries 4x E1 / T1 TDM interfaces and up to 2 Gigabit Ethernet bandwidth over a Fiber Optic link. 

FO-4E1T1 is a Pseudowire TDM over IP gateway that delivers low end to end latency to TDM services over an Ethernet / IP network or Point to Point fiber link.


FO-4E1T1-GE is a low latency TDM over IP gateway that is used as

  1. Fiber Optic modem: carries 4 E1 / T1 interfaces and up to 2 Gigabit Ethernet bandwidth over a Point to Point optical link with 1+1 optical link protection. Two optical interfaces enable Multi-Point or Daisy-chain schemes.
  2. Pseudowire TDM over IP gateway: several Bundles can be transmitted over an Ethernet or IP packet network

FO-4E1T1-GE is a cost optimized solution with very fast deployment and lower OPEX thanks to optimized installation and management functions.

FO-4E1T1-GE is a robust design with extended operating temperature range.

FO-4E1T1-GE is a perfect solution for many requirements such as

  • Telecoms Service Operators: CPE for Ethernet and E1 / T1 Circuit Emulation Services 
  • Enterprises: Ethernet and TDM PBX interconnection
  • 3G / 4G mobile networks: Base Station connection with high bandwidth Ethernet and E1/T1 services
  • Campus : TDM E1 / T1 and Ethernet extension 
  • Electric Utility and Transportation networks: fiber optic interconnection of Utility substations with TDM E1 / T1 and Ethernet interfaces


  • 4x E1 - 2,048 Mbps : G703 / G704, HDB3, RJ45 120 Ohms or BNC 75 Ohms
  • 4x T1 - 1,544 Mbps : AMI or B8ZS, RJ45 100 Ohms
  • CES or SAT over Packet encapsulation 
  • end-to-end latency : 0,5 ms (Point to Point)
  • 2x Gigabit Ethernet RJ45 ports, auto MDI/MDIX
  • 2x SFP optical Gigabit Ethernet ports, WDM option 
  • 802.1D Ethernet bridge
  • 1+1 Protection and 802.3ad Link Aggregation 
  • QoS, 802.1p
  • VLAN, Provider Bridge
  • Compact métalic enclosure
  • Dimensions : 218 x 124 x 44 mm
  • Weight : 0.7 kg
  • Power supply: two 12 - 48 Vdc power inputs
  • Management: CLI, Web, ssh, telnet, http, https, ftp, snmp, syslog

FO-4E1T1-GE-R-C     4xE1/T1 RJ45, 12-48 Vdc power supply

FO-4E1T1-GE-R-V     4xE1/T1 RJ45, 12-48 Vdc power input and external 110 - 230 Vac converter

FO-4E1T1-GE-B-C     4xE1 BNC 75 Ohms, 12-48 Vdc power input

FO-4E1T1-GE-B-V     4xE1 BNC 75 Ohms, 12-48 Vdc power input and external 110 - 230 Vac converter