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-RS232/422/485 Converter JHA-CE1tD1/R1/Q1

    • Based on self -copyright IC
    • Provide 2 clock types: Co-Directional G.703 master clock and G.703 line clock;
    • Provide two loopback functions, namely G.703 of the local loop, RS232 / 422/485 from the local loop.
    • Pseudo-random code test function, bring great convenience to installation and commissioning of the equipment
    • The co-directional 64K G.703 support 120Ω balanced impedance;
    • AC 220V, DC -48V, DC + 24V power Optional ,DC power supply no positive and negative points;


PDH/Voice Multiplexer

Interface converters

Co-Directional 64K Converter

  • Co-Directional 64K-RS232/422/485 Converter JHA-CE1tD1/R1/Q1


    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.
        64k-RS232/422 / 485 interface converter provides ITU-T co-64K G.703 standard E1 interface and standard RS232 / 422/485 conversion interface between the physical layer. Network to provide secure communications between devices of different interfaces, the seamless connection. Suitable for transmission equipment E1 channel portion slots available, and the equipment needed to transfer data and only RS232 / 422/485 outlet occasions.

    Product Photo


    Mini  Type




    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-CE1tD1/R1/Q1
    Functional Description Co-Directional 64K-RS232/422/485 Converter, Serial port rate 0-14.4K
    Port Description 1 Co-Directional 64K interfaces, one data interface (RS232 / RS485 / RS422)
    Power Power supply: AC180V ~ 260V;DC –48V;DC +24VPower consumption: ≤10W
    Dimension Product Size:  216X140X31mm (WXDXH)
    Weight 1.2KG




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