P4/P2 - Engineering Excellence

It all about the engineering: we are often asked what makes DCI products work so simply and effectively. As a rule, we tend to understate this, evoking DCI motto 'Audeo Proesto - Dare to Excel' instead but, here in short are just some of the pure engineering reasons that make our products stand out.









DCI is an industry leader in copper (D10) based, field deployable communications systems. 
With our first product generation ‘P3’ in operational use since 1999 and having secured intellectual property with two patents: GB2359442 and 2004100111, DCI continues to develop outstanding innovative products that closely match user requirements.

Through close collaborative relationships with the Signaling community, we gained unparalleled, in depth competence with product development and its life cycle support. DCI’s integrated technical support and training programs deliver tangible and proven results – with less than 2% equipment outages.  

DCI’s second product generation, P4/P2 represents 5 years of development encompassing component and material research, precision mechanics and an outstanding electronics design.  These disciplines however are secondary to the final product simplicity of use and features that users want.

We are confident and proud to state that the P4/P2 products will prove outstanding; serving the wide ranging Signaling community for the products’ nominal life cycle of 10+ years.

Here we highlight few of the products unique design features:

Software Design:

Components Selection and Design:

Primary Protection: diverts most of the lightning energy or high transients on the copper to earth ground. Because of the high energy absorption of a primary protection device, this device does not react fast.

Secondary Protection: The secondary protection is for smaller (residual) energy absorption and
                requires very fast reaction (high speed low capacitance diodes counteract both differential and common mode fast transients until the high energy primary protection divert the full energy of any fast transient). The secondary protection also deals with the residual fault current passed from the primary protection and consists of both voltage and current limiting. The overvoltage protection prevents damage to the equipment and shock hazards, whereas current limiting prevents damage to wiring and the voltage limiters themselves.

Filtering:  line interface common mode filtering achieves better signal immunity against fast transients.

Isolation: protection against common mode surges or dc voltage inductions are commonly by the IEC-60950 which is typically 1500 VDC.  DCI products provide guaranteed isolation to 2000 VAC (or 2800 Vpeak). This is achieved by custom engineered components and means effective lightning surge protection and fast transients in harsh environmental conditions.

Tertiary Protection: provides Residual Overvoltage Signals Limiting that would normally have an impact on electronics longevity. A network of fast diodes effectively limit overvoltage signals to the chipsets power supply.

Thin Foil Capacitors: in contrast to the industry standard surface mount ceramic; DCI uses the so called ‘self-healing’ film capacitors.   Self-healing is a phenomenon where in the event of overvoltage the capacitor does not crack or short circuits. Instead, the capacitor repairs itself - a special material property effect due to the thinness of the foils used.

Emergency Freeze: is a unique feature that allows milliseconds disturbance on the transmission line without the line restart.  This is a firmware feature that in combination with the hardware lightning protection circuits, provides  continuation of service with equipment maintaining operation in harsh environmental conditions (this is in contrast to other manufacturers transmission equipment that at best, would experience frequent transmission restarts).

P4-P2 Front End Protection Design


P4/P2 Field Deployed Performance – DSL Technologies Essentials
This section is important.  It distills 15+ years of experience working with copper based transmission systems and with fibre-optic transmission for 20 years prior to that. Support and feedback from the Australian Army and others in the Signals community has gained us knowledge and a unique position of authority on copper based transmission technologies that we present here for the benefit of our customers:

Qualified Trial Results: over recent years P4/P2 equipment has been widely trialled in field conditions.
We are disseminating these results for our customers reference:

P4/P2 Links – Trail Results Compilation 2014..2016

Cable Distance

Cable Type

single channel

Bandwidth Aggregation
(for Ch-2, Ch-3 & Ch-4 respectively)

1 to 1000 m

D10 or WD1A/TT

12 to 15 Mbs

24..30   36..45     48..60 Mbs

1 to 4 Km

D10 or WD1A/TT

≈ 5.7 Mbs

 11.4    17.1         24.8    Mbs

5 to 7 Km

D10 or WD1A/TT

≈ 2 Mbs

   4.0     6.0          8.0     Mbs

7 to 12 Km

D10 or WD1A/TT

≈ 500 Kbs

   1.0     1.5          2.0    MBs

10 Km

*0.9mm Tel Cable

1.6 Mbs

   3.2     4.8          6.4    Mbs

* - please note the exceptional transmission performance with a 0.9mm telephone copper cable
(this is purely due to the cable's high copper content per condictor)
   - by comparison ‘D10’ equivalent diameter is around 0.4 and 0.5mm in diameter
   - however in contrast to telephone cables, ‘D10’ offers strength due to its steel & copper strands
   - one practical tip for customers requiring more bandwidth over distance is to use 2 pairs of ‘D10’
     cable, connecting both pairs in parallel and therefore doubling its transmission capacity)


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