Shenzhen JHA Technology Co., Ltd is one of the leading manufacturers of hardened Ethernet, PoE, and fiber connectivity products specifically designed for harsh and demanding environments.


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Co-Directional 64K-FE Converter JHA-CE1tF1

    • 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)


PDH/Voice Multiplexer

Interface converters

Co-Directional 64K Converter

  • Overview

    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.

    Product Photo

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     Mini  Type


    • 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 Model Number:JHA-CE1tF1
    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 Power supply: AC180V ~ 260V;DC –48V;DC +24VPower consumption: ≤10W
    Dimension Product Size:  216X140X31mm (WXDXH)
    Weight 1.2KG



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