Focus area: Supply and control

DOCSIS 3.1 Headend Return PatH upgrade

Project URL:

Solution/product description

Today’s Cable-TV networks are mainly using a coaxial cable infrastructure for the last mile combined with a fiber optic systems for the signal contribution known as HFC-networks. DOCSIS 3.1 aims to deliver 10+ Gbps downstream and 1+ Gbps in upstream. The new version should reduce the cost of transmission, increase the spectral efficiency, and improve the energy efficiency.
Moreover, to migrate to DOCSIS 3.1, the Cable-TV Operators must upgrade their optical Headends in a smart way. This requires a solution, which has low power consumption, cost efficient and high density optical transceivers. Furthermore, Cable-TV Operators are concerned by node segmentations and split in order to deliver higher bandwidths to the subscribers and reduce the congested noise.
In order to solve these challenges DELTA Electronics offers a unique high density and low-noise return path receiver platform which meets these requirements.
• Energy-efficient
• Cost-efficient
• High number of optical return-path receivers in 1 rack unit
• Compatible to any HFC/RFoG architecture

In this proposal, we focus on SFP-based low-noise optical return-path receivers with extremly low power consumption.

The depth of chassis complies with the standard size of todays’ street cabinets. The platform size is a compact 1 RU with the depth reduced. The adaptive management/monitoring are designed in the same chassis, so that no extra line card/equipment is needed for the management. The monitoring unit has a dynamic algorithm that detects which line card type is inserted in the chassis. The main platform is not limited to only a return-path receiver. The redundant hot-swappable power supply can be placed at front or the rear panel. The low power consumption of each line card is one of the valuable features of this universal platform.
The optical return-path receiver supports up to 10 SFP modules (20 Rx) in 1RU. It is energy efficient with less than 1.5 W per return-path receiver. The touch display of IPOD MIPI display allows monitoring the receivers. Next to the display there is a USB connector for updating the firmware. The software offers a user-friendly GUI to configure/monitor the parameters of each components in the chassis. On the rear panel, 20x75 Ω MCX RF outputs are designed to have a smooth transition between the receivers and the CMTS inputs. On the front, we offer an intelligent cooling concept that simplify the air-flow inside the chassis and let the module to cool down instantly irrespective of the ambient temperature. This enables a wide temperature range.
The complete chassis offers the highest Tx/Rx density in 1 RU, which increases the rack elevation in the Headend, and eases the cable management at the back. The depth of the chassis is minimized to allow simple cable managements at the back of the device, to simplify the air-flow, and to enable an easy access to the back of the equipment.

The SFP optical receiver Headend allows the operator to design the network in different ways irrespective of the architectures, namely, legacy HFC or RFoG - FTTx.

How does your project address / improve the focus area (Monitoring and Measurement, Demand Response, Supply and Control)?

1. Due to the further significant expansion of downstream bandwidth, but especially for the return path of the HFC-network the number of needed return path receivers in the headends are growing.
2. In order to fulfill the broadband demand and to support higher upload rates DOCSIS 3.1 is offering return path frequency range up to 204 MHz in the first stage. Therefore most of the old existing return pather receivers has to be replaced anyway.
3. With the proposed concept (less than 1.5 W per return path) a significant reduction of the needed power (existing return pather receiver are consuming between 8 and 10 W) will be possible.
4. Due to the low power consumption the needed air condition for Headend equipment will be heavily reduced.

What was your inspiration for your project?

Creating a complete new approach for Cable-TV equipment inspired by digital transmission technology (where SFP is a common used technology).

What is the single most exciting thing about your project?

The proposed solution is able to refinance their own costs within a short time frame (reduction of power and less air condition)

Why did you decide to take part in the Adaptive Power Challenge?

We are convinced, that the proposed solution will be a significant contribution to reduce power and air condition in HFC-Headends + using the existing space much more efficient.
In addition the solution will re-finance itself in a short time frame.