TAINET’s Fiber Ethernet Network Terminal Unit (FNTU) 761 series

TAINET’s Fiber Ethernet Network Terminal Unit (FNTU) 761 series allows the operator to provide Ethernet data traffic and TDM E1 services. Nowadays IP switching networks have been replacing the traditional SDH/PDH ring network. However, the E1 connection still exists in local areas and remote offices. The problem of the E1 time slot transmission is that it is not able to access the IP switching network directly and it will cause the E1 circuit working devices to stop or seek the PTN network for extending access.

FNTU 761 series is using Pseudo-Wire Emulation Edge to Edge (PWE3) technology to access the Ethernet. Based on the CESoPSN and SAToP standards, the optical and electrical Ethernet interfaces can easily access each node in the IP network and provide the so-called TDM over IP feature.


  • Comply with IETF draft standard for CESoPSN and SAToP; Metro Ethernet Forum MEF 8 IE
  • Supports both Point-to-Point and Point-to-Multipoint operation
  • Comply with IEEE 802.3, 802.3u, 802.3ab and 802.3z Gigabit Ethernet standard
  • Front-panel test button to trigger OAM auto loopback test
  • Support SFP DDM (Digital Diagnostics Monitoring)
  • Support WDM Bi-directional SFP module with specific wavelength for various distance
  • Support copper line cable diagnostics feature
  • Comply with IEEE 802.1q Tag VLAN *
  • Support Q-in-Q function *
  • Support Dying Gasp function
  • Maximum Frame size 9K bytes
  • Ethernet bandwidth Control
  • Support IGMP Snooping and Spanning Tree function *
  • Alarm prompt indication on network failure
  • DIP Switch quick link or WEB GUI operation


  • FNTU 761C, chassis line card, Gigabit Ethernet NTU (RJ-48 Connector)
  • FNTU 761CU, chassis line card, Gigabit Ethernet NTU (BNC Connector)
  • FNTU 761S, stand-alone Gigabit Ethernet NTU (RJ-48 Connector)
  • FNTU 761SU, stand-alone Gigabit Ethernet NTU (BNC Connector)
Optical Interface
  • Connector type: SFP-LC
  • One port for 1000Base-X SFP modules
  • Support SFP DDM (Digital Diagnostic Monitoring)
  • Temperature, Voltage, Current, Tx Power, Rx Power
  • For detailed wavelength and distance of SFP modules, please refer to the SFP Transceivers datasheet
Ethernet Interface
  • Connector type: Shield RJ-45 jack
  • Two ports for 10Base-T/100Base-Tx/1000-BaseT
  • Auto-MDI/MDIX detection
  • Auto-negotiation for speed and Full/half duplex support
  • Support Ethernet cable diagnostics feature
  • Complies with IEEE 802.1q Tag VLAN (including Q-in-Q)
  • Bandwidth control and support 9K Jumbo frame
  • 802.1P priority queue control*
  • Dying Gasp
  • IGMP Snooping
  • 802.1D Spanning Tree
TDM E1 Interface
  • Connector type: 4 standard G.703 E1 interfaces (RJ-48C) (FNTU761S/C), BNC connector (FNTU761SU/CU)
  • Line impedance: 75 ohms or 120 ohms +/- 5 % resistive
  • Line Code: HDB3
  • Line rate: 2.048Mbps ± 50ppm
  • G.704 Framing with CRC or Unframed mode support.
  • Jitter performance: compliant with ITU-T G.823
  • DS0 Bypass On/Off
  • Support Local/Remote Loopback diagnostics
System Functions
  • SAToP/CESoPSN technology, according to IETF RFC 4533, MPLS/FR Alliance, ITU-T and MEF8 1A standards PWE3
  • Clock mode: Adaptive, Internal, Receive or DCR
  • Support TFTP/ Telnet/ HTTP protocol
  • Configuration via DIP switch, Telnet CLI, WEB GUI or SNMP
  • TFTP/HTTP firmware upgrade
  • RMON counters
  • Front-panel test button for easy loop healthy testing
  • Reset button back to factory default
  • Ethernet port mirror
  • Support IEEE 802.3ah Link Layer OAM

Ÿ Loopback test

Ÿ Dying Gasp

LED Indicators
Power Requirement
  • AC/DC, DC/DC external power adapter (12V, 1A)
  • Power consumption: 6.8W
  • CE Mark
  • 86.2(W) x 172(D) x 49.6(H) mm
Operating Environment
  • Operation Temperature: 0 o C ~ 50 o C
  • Storage Temperature: -20 o C ~ 80 o C
  • Humidity: 90%, non-condensing