32xE1/T1 Electrical Interface Switching Board(75 Ohm)

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PN: 03026727 Category:
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Huawei OSN 3500 System Test Procedure
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The D75S receives and transmits 32xE1 electrical signals.

The D75S must work with the PQ1.

The D75S need to configure 4*E1 subscriber cable.


SSN1D75S is a PDH interface switching board, receives and transmits 32xE1 electrical signals, can be used on Huawei OSN 1500B, OSN 2500, OSN 3500, OSN 7500 when work with PQ1. SSN1D75S part number is 03026727, model name is D75S.

Tech Specs
Front Panel
The front panel of the D75S has interfaces and a bar code.

Valid Slot
OSN 1500B: SSN1D75S can be installed in slots 14–17.

OSN 2500: SSN1D75S can be installed in slots 1-4 and 15-18.

OSN 3500: SSN1D75S can be installed in slots 19–26 and 29–36.

OSN 7500: SSN1D75S can be installed in slots 19–22 and 35–38.

Optical Interface Parameter
Nominal bit rate 2048 kbit/s
Line code pattern HDB3
Waveform at the output interface Complies with ITU-T G.703.
Signal bit rate at the output interface
Allowed attenuation at the input interface
Allowed frequency deviation at the input interface Complies with ITU-T G.823.
Input jitter tolerance
Anti-interference capability at the input interface Complies with ITU-T G.703.
Reflection attenuation at the input/output interface
Output jitter Complies with ITU-T G.823 and G.824.
Mapping jitter Complies with ITU-T G.783.
Combined jitter
Jitter transfer function Complies with ITU-T G.742.
Impedance (ohm) 75
Mechanical Specifications
Dimensions (mm) 22.0 (W) x 125.2 (D) x 261.4 (H)
Weight (kg) 0.4


Additional information
Weight 2.0 kg
Dimensions 34.0 × 33.0 × 9.4 cm

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Q: How many versions does D75S have?

A: The D75S is available in N1 version.


Q: What’s the difference between D75S and D12S?

A: D75S and D12S is E1 interface board for PQ1, D75S is 75ohm, D12S is 120ohm.


Q: Can I use 120ohm cable connect on D75S?

A: No, you can’t, if you use 120ohm Cable, please choose D12S interface board. To avoid incompatibility, please tell sales team your resistance.


Q: Does D75S /D12S come together with PQ1 board?

A: Yes, D75S / D12S price is inclusive in PQ1 board


Q: How could I do, if I have PQ1+D75S, but my DDF is 120ohm?

A: You may choose a 75ohm/120ohm converter, it looks like a DDF panel, can fix on your DDF rack to convert 75ohm to 120ohm.

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