Hexin Technology HXSP-G703 User Manual

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HXSP-G703 Balun G.703 75-ohm to 120-ohm

Female BNC to RJ-45

1. Description of Product:

HXSP-G703 is an impedance converter from balance to imbalance. It settles down the
signal conversion from 75 ohm copper axis cable to 120 ohm twisted pair wire.

By G703 converter, it is quick and easy to compete the signal communication between
regular 120 ohm twisted pair wire and 75 ohm copper axis cable.

2. Specification Sheet

[Dimension]

A-20MM B-78MM C-42MM D-20MM E-65MM
[Wiring Diagram]

3. Electrical Characters

Impedance: 75 ohm unbalanced coaxial to 120 ohm balanced twisted pair
Bit Rates: 2.048Mbit/s as ITU-T Recommendation G.703 Line Code
Return Loss: 2.048Mbit/s as per G.703 requirements
Insertion Loss: <0.9dB from 51kHz to 51.55MHz
Cross Talk: >60dB from 51kHz to 51.55MHz between 2 baluns mounted 15mm

apart

Pulse Shape: 2.048Mbit/s as per G.703
Signal Levels: 2.37V nominal peak voltage for 2.048Mbit/s at the coaxial end
Isolation Voltage: 250VDC for 1 minute between windings
Pulse Test: 3kV as per ITU-T, K.17
Dimensions: 78mm x 42mm x 20.5 mm

4. Connection:

COAXIAL CONNECTOR (75 ohm): BNC Female To IEC169 -8
RJ45 Jack (120 ohm): TWISTED PAIR CABLE to standard

RJ45 Pin Out

Pin Out Table

Signal

RJ-45

Description

DTE
RJ45

BNC

Description

DTE
BNC

Tx +

Receive Input

1

Receive Input

Tip

Tx -

Receive Input

2

Receive

Ring

Rx +

Transmit

4

Transmit

Tip

Rx -

Transmit

5

Transmit

Ring