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  • Based on self -copyright  IC
  • Can Realize Ethernet data transmission in one Co-directional G.703 circuit
  • Inter-set dynamic Ethernet MAC address (4,096) with local data frame filtering
  • The local device can manage the remote device
  • Have the function of G.703 loop back check, and indicate on LED
  • Can differentiate the reason of Co-directional G.703 lose signal is that the remote device power-off or directional G.703 line broken
  • Ethernet interface supports 10M/100M, half/full duplex auto- adaptable, supports VLAN
  • Ethernet interface supports AUTO-MDIX (crossed line and straightly connected line self-adaptable );
  • Provide 2 clock types: Co-Directional G.703 master clock and G.703 line clock;
  • The local device can forced the remote device rate follow it(when the device is unframed mode, that is invalid)
  • Have three Loop Back Mode: G.703 interface Loop Back (ANA)、Ethernet interface Loop Back(DIG)、Command the remote Ethernet interface Loop Back(REM)
  • Support self-adaptable 120 Ohm balance;
  • Co-Directional G.703 Interface  

Interface Standard:                                   comply with protocol ITU-T G.703;

Interface Rate:                                           64Kbps±50ppm;

E1 Impedance:                                           120Ω (balance);

Jitter tolerance:                                          In accord with protocol G.742 and G.823

Maximum Transmission Distance:        up to 500m


  • Ethernet interface (10/100M)

Interface rate:                         10/100 Mbps, half/full duplex auto-negotiation

Interface Standard:               Compatible with IEEE 802.3, IEEE 802.1Q (VLAN)

MAC Address Capability:     4096

Connector:                              RJ45, support Auto-MDIX


  • Working environment

Working temperature:                   -10°C ~ 50°C

Working Humidity:                        5%~95 % (no condensation)

Storage temperature:                    -40°C ~ 80°C

Storage Humidity:                          5%~95 % (no condensation)



Model Number: AN-COD-E1

Functional Description

10 / 100M Ethernet data transmission channel in the same direction on the G.703 (Co-Directional G.703), Ethernet rate 64K

Port Description

One co-directional 64K interface, 1 Fast Ethernet interface


Power supply: AC180V ~ 260V;DC –48V;DC +24V

Power consumption: ≤10W


Product Size:  216X140X31mm (WXDXH)




One co-directional 64K interface, 1 Fast Ethernet interface inferface converter, AC or DC power


64k-V.35 / V.24 interface converter provides ITU-T co-64K G.703 standard
E1 interface and standard V.35 conversion interface between the physical layer
/ V.24.

The G.703 (Co-Directional G.703) interface divides 64Kbps cycle into 4 unit intervals, it uses“0101” represent  “0”, “1100” represent “1″. By alternating transformation polarity of the adjacent block, binary signals convert three-level signals. In every 8th group destroyed block of alternating polarity, thus to transmit 8KHz timing signal. By the above coding, G.703 co-directional 64Kbps signal could achieve transmitting the timing signal of 64KHz and 8KHz and 64KHz and the data signal of 64Kbit/s in the same direction with a pair balanced line.
This interface converter provides one co-directional G.703 interface and one Ethernet interface to achieve 10/100Base-T Ethernet data transmission on the G.703 channel. It is a high performance, self-learning Ethernet bridge. This device is the extension device of Ethernet, using network (PDH/SDH/Microwave) that provide G.703 channel to achieve local and remote Ethernet interconnecting with serial interfaces at a lower cost. The device has inter-set loop test function to facilitate the project launching and daily maintenance.

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