SOONTAI - DOCSIS 4.0, DOCSIS 3.1 Cable Modem Diplexers

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Cable Network Diplexers
DPX1 Series

Features

* Wideband, up to 1.8 GHz

* Support DOCSIS 4.0 / 3.1, MoCA, EoC

* Flat Passband

* Low Loss

* High Rejection

* Excellent Return Loss

* High Stability

* Die-casting Housing

* High RFI Shielding

* Precision Connector Thread

* Good Plating Quality

* Good Weather Resistance

Introduction

In a cable network system, it may be possible to combine or separate upstream and downstream signals by using a 2-way splitter (and filters).

However, the 2-way splitter cannot effectively isolate the two frequency bands, interference between upstream and downstream is often a problem. In addition, because the insertion loss of the general 2-way splitter is about 3.5~4dB, it will cause excessive loss to the signal.

To properly solve this problem, you need to use a diplexer to replace the 2-way splitter.

The DPX1 series is a wideband, high performance cable network diplexers. It offers many features:

1. Lowest insertion loss: Upstream and Downstream bands through-loss < 1.0dB, reduced the insertion loss to absolute minimum.

2. Excellent return loss: Better than 16dB is essential for upstream and downsterm bands to provide a good match of impedance so as avoid an increased in noise and to reduce signal loss to keep the signal clean.

3. High rejection: Better than 45dB provides a good isolation and avoids interference.

4. Closed cover panel and thick die-casting housing provides very good RFI shielding performance.

In addition to the general models in the table below, the upstream and downstream bands can be designed according to customer specifications.

For more diplexer products, please see our diplexer category.

**Items**
Model	Upstream Band	Downstream Band
DPX1-30/47	5 - 30 MHz	47 - 1000 MHz
DPX1-42/54	5 - 42 MHz	54 - 1000 MHz
DPX1-50/65	5 - 50 MHz	65 - 1000 MHz
DPX1-55/70	5 - 55 MHz	70 - 1000 MHz
DPX1-65/85	5 - 65 MHz	85 - 1000 MHz
DPX1-85/108	5 - 85 MHz	108 - 1000 MHz
DPX1-42/54-1800	5 - 42 MHz	54 - 1800 MHz
DPX1-85/108-1800	5 - 85 MHz	108 - 1800 MHz
DPX1-204/258-1800	5 - 204 MHz	258 - 1800 MHz
DPX1-204/258-3000	5 - 204 MHz	258 - 3000 MHz

**Electrical Curve** ( DPX1-42/54 )
Insertion Loss \| Return Loss Upstream Band Fig. 1	Insertion Loss \| Return Loss Downstream Band Fig. 2

Insertion Loss \| Return Loss Close-up fig. 1 Fig. 3	Insertion Loss \| Return Loss Close-up fig. 2 Fig. 4

**General Specifications**
Item	DPX1 - 42 / 54
Impedance	75 ohm
Frequency Range	5 - 42MHz	54 - 1000MHz
Insertion Loss	0.5dB (typ) / 2.0dB (max)	0.5dB (typ) / 2.0dB (max)
Return Loss	20dB (typ) / 14dB (min)	20dB (typ) / 14dB (min)
Rejection (Isolation)	50dB (typ) / 45dB (min)	50dB (typ) / 45dB (min)
Dimensions	18(H) x 74.5(W) x 33(D) mm
Net Weight (approx.)	60g

* Specifications may be change depending on the model or customer's requirement.