Cable Network series
Cable Network Diplexers DPX1 Series
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
  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.

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.

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