RuggedCom RS400 manual EoVDSL Parameters when applicable, Ethernet Ports Current

Ethernet Ports

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3.2.6 EoVDSL Parameters (when applicable)

From the switching functionality point of view Ethernet-over-VDSL (EoVDSL) ports function the same way as 10/100Base-TX Ethernet ports. The VDSL interface is only used as a media to transfer regular Ethernet frames. However, the link throughput and the link establishment procedure are different.

According to the VDSL standard, one of the VDSL link partners is required to operate as a LT (Line Termination) or Master device while the second link partner operates as a NT (Network Termination) or Slave.

Two types of VDSL ports are currently supported by ROSTM. The first one is Universal VDSL and the second one is Long-reach VDSL. The Universal VDSL port provides symmetric upstream and downstream throughput and is generally more suitable for higher throughput connection which spans a shorter distance (< 2.5km). The Long-reach VDSL port provides asymmetric upstream/downstream throughput and is generally more suitable for lower throughput connection which spans a longer distance (up to 4km). Note that a Universal VDSL port (master or slave) must be connected to another Universal VDSL port (slave or master). The same requirement applies to Long-reach VDSL ports as well. Connection between Universal VDSL ports and Long-reach VDSL ports is not supported. While master/slave mode can be modified on Universal VDSL ports, the operating mode of all Long-reach VDSL ports is pre- determined by hardware. As a result, master/slave mode cannot be modified on Long-reach VDSL ports.

When the EoVDSL link is initially established, the ROSTM EoVDSL Master device automatically scans several different VDSL profiles, while measuring Signal-to-Noise Ratio (SNR). Eventually the profile with the highest throughput (where the SNR is still high enough to guarantee reliable communication - the required SNR values are specified by the VDSL standard) will be selected by ROS™. Even after locking onto the “optimum” profile, ROS™ will remain continuously monitoring the signal quality and, if the link-quality should drop below an acceptable limit, ROS™ will automatically shift downward to a lower throughput profile, thus maintaining high channel reliability – although sacrificing link-throughput.

The EoVDSL configuration and status parameters can be accessed from the Ethernet Ports submenu.

RS400 105 ROS™ v3.5