NV-600RI can fully compatible with NV-600L, NV-600LI, NV802S, NV-1602S.

Check the power plug by plugging in another that is functioning properly. Check the power cord with another device. If these measures fail to resolve the problem, have the unit power supply replaced by a qualified distributor.

Network interface (ex. a network adapter card on the attached device), network cable, or switch port is defective.

• Power off and re-power on the VDSL bridged.

• Verify that the bridge and attached device are power on.

• Be sure the cable is plugged into both the bridge and corresponding device.

• Check if the proper cable type is used and its length exceed specified limits.

• Check the bridge on the attached device and cable connections for possible defects.

• Replace the defective bridge or cable if necessary.

Because VDSL setting failure or phone cable length is over the specification limit.

4.1 Please make sure that the phone wire must be connected between NV-600LI(CO) and NV-600RI(CPE) when both are power on. NV-600LI(CO) will do link speed function depending on phone wire length, therefore if NV-600LI(CO) can’t detect NV-600RI(CPE) over phone wire while both power on, this will cause the link to fail.
4.2 Please check phone wire, we recommend use 24-26 gauge with twisted pair and without rust.
4.3 Please check the correct Dip Switch setting.
4.4 Please reinsert power when change cable length or link time over 3 minutes.

Note:

Phone wire must meet CAT 3 standard or above and without clustering, otherwise will cause more cross talk issue to reduce DSL power driver.

Very-high-speed digital subscriber line 2 (VDSL2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for traditional telephone service. It can be deployed from central offices, from fiber-optic connected cabinets located near the customer premises, or within buildings. It was defined in standard ITU-T G.993.2 finalized in 2005.
VDSL2 was the newest and most advanced standard of digital subscriber line (DSL) broadband wireline communications. Designed to support the wide deployment of triple play services such as voice, video, data, high definition television (HDTV) and interactive gaming, VDSL2 was intended to enable operators and carriers to gradually, flexibly, and cost-efficiently upgrade existing xDSL infrastructure.

The protocol was standardized in the International Telecommunication Union telecommunications sector (ITU-T) as Recommendation G.993.2. It was announced as finalized on 27 May 2005,[1] and first published on 17 February 2006. Several corrections and amendments were published in 2007 through 2011.

VDSL2 is an enhancement to very-high-bitrate digital subscriber line (VDSL), Recommendation G.993.1. It permits the transmission of asymmetric and symmetric aggregate data rates up to 200 Mbit/s downstream and upstream on twisted pairs using a bandwidth up to 30 MHz.

VDSL2 deteriorates quickly from a theoretical maximum of 250 Mbit/s at source to 100 Mbit/s at 0.5 km (1,600 ft) and 50 Mbit/s at 1 km (3,300 ft), but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1.6 km (1 mi) its performance is equal to ADSL2+.

ADSL-like long reach performance is one of the key advantages of VDSL2. LR-VDSL2 enabled systems are capable of supporting speeds of around 1–4 Mbit/s (downstream) over distances of 4–5 km (2.5–3 miles), gradually increasing the bit rate up to symmetric 100 Mbit/s as loop-length shortens. This means that VDSL2-based systems, unlike VDSL1 systems, are not limited to short local loops or MTU/MDUs only, but can also be used for medium range applications.

Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. It is defined as the ratio of signal power to the noise power. A ratio higher than 1:1 indicates more signal than noise. While SNR is commonly quoted for electrical signals, it can be applied to any form of signal (such as isotope levels in an ice core or biochemical signaling between cells). The ratio is usually measured in decibels(dB)

The signal-to-noise ratio, the bandwidth, and the channel capacity of a communication channel are connected by the Shannon–Hartley theorem.

In digital communications, the SNR will probably cause a reduction in data speed because of frequent errors that require the source (transmitting) computer or terminal to resend some packets of data. SNR measures the quality of a transmission channel over a network channel. The greater the ratio, the easier it is to identify and subsequently isolate and eliminate the source of noise.

1. The VDSL2 CO/CPE mode settings of VDSL2 router become unknown.

   VDSL2 CO and CPE router tone mode is different due to mixed use of new and old hardware VDSL2 routers.

   Solutions:

   1. Using the console, reboot the system and go to loader menu. Select set boot parameters and choose the VDSL2 CO/CPE mode correctly. Choose “1” if it is CO router and “0” if it is CPE router. Do not just press enter to skip the setting as it will not retain even if the setting is correct, then it will become unknown causing the VDSL2 router not to link. 1: NV-600LI. 0: NV-600RI.

   2. Update the old hardware to latest firmware so that you can set the same tone mode for both CO and CPE router.

NV-600LI/RI maximum ethernet frame MTU is 1536 bytes.