Premlink – RFoG ONU / MDU Manufacturer
RFoG, or Radio Frequency over Glass, is a technology that replaces the coaxial component of a hybrid Fiber-Coaxial (HFC) network with a Passive Optical Network (PON) architecture. This new method improves efficiency and performance when delivering cable services via fiber optics. The Society of Cable Telecommunications Engineers (SCTE) has taken steps to standardize this technology by releasing detailed specifications for RF over glass fiber in the document ANSI/SCTE 174 2010, which outlines the technical requirements and best practices for implementing RF over Glass systems in modern telecommunications networks.
Premlink’s popluar product, PL10x seres, is totally comply with SCTE 174 2010 standard, we product thise series in a large quantity for long years. It is super reliable with excellent performance, PL10-3A is a classic product with optical in/out into one connector. PL10-4A has GPON pass through port and PL10-6A has XGSPON + GPON pass through port
ONU MDU Configuration Selection
Input / Output | Output Level | Laser Type & Power | Return Laser (Typical) | Band Split | Power Adapter |
|---|---|---|---|---|---|
Forward Only | 78dBμV | DFB 1mW | 1490nm | 30 / 47MHz | Chinese Standard |
Forward and Return | 80dBμV | DFB 2mW | 1510nm | 42 / 54MHz | Euro Standard |
GPON Pass | 86dBμV | DFB 3mW | 1530nm | 65 / 85MHz | US Standard |
XGSPON+GPON Pass | 95dBμV | Isolated DFB 1mW | 1570nm | 85 / 105MHz | UK Standard |
/ | 105dBμV | Isolated DFB 2mW | 1590nm | 108 / 258 MHz | Japan Standard |
/ | / | Isolated DFB 3mW | 1610nm | / | ... |
The Benefits of RF over Glass Technology
RF over Glass technology provides cable operators with a cost-effective network expansion and upgrading solution, allowing cable operators to continue to use existing HFC transmission equipment and subscriber terminal equipment to deploy new FTTP networks, greatly reducing the capital investment in network transformation.
With this technology, cable operators can transmit a variety of cable services over optical fiber and can continue to use the original equipment and billing systems, CMTS platforms, front-end equipment, set-top boxes, conditional access and cable modems.
Cable operators in the transformation of the original HFC network, only in each subscriber’s residence to install a new miniature optical station known as an optical network unit (ONU), used to convert optical signals into electrical signals, this process replaces the traditional by the deployment of the HFC network in the high-level optical station to perform the function of the radio frequency network equipment remains unchanged, but only the optical network terminals from the optical station to the subscriber’s residence.
How does RF Over Glass Work?
In the Cable TV bidirectional transmission network constructed by applying RF over Glass technology, the forward channel is exactly the same as the traditional HFC network, adopting broadcast transmission service, and the fundamental difference is in the return channel.Â
Using RFoG technology optical node, the reverse optical transmission component of the laser works in a ‘burst’ mode and CMTS the same time division control technology (TDM) to control the optical node back to the laser ‘on’ or ‘off’ working state, so as to achieve the following results The same time-division control (TDM) technique as CMTS is used to control the ‘on’ or ‘off’ operating state of the optical node’s return laser, so that only one optical node is allowed to communicate with the CMTS head-end at any given point in time.
When the modem at the user’s end does not send a return RF signal, the optical node’s reverse laser is in the off state; the optical node’s reverse laser is turned on only when the modem sends a return RF signal, and when the modem’s return RF signal has been sent, the reverse laser is immediately turned off.Â
The return optical signals from multiple optical nodes can be aggregated through an optical splitter, and then transmitted back to the split front end using a single optical fibre, and then received by an RFoG dedicated reverse optical receiver and sent to the CMTS uplink receive port.
After the introduction of RF over glass technology into the traditional HFC transmission network, not only can it easily achieve the forward shift of optical nodes, but also can effectively suppress the burst noise of the uplink backhaul channel.
