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NV-802S - 8-ports VDSL2 IP DSLAM

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  8-ports VDSL2 IP DSLAM



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NV-802S is a compact 8-ports VDSL2 IP DSLAM with 2 Gigabit Ethernet Combo interfaces and built-in POTS/ISDN splitter. It is compliant to ITU-T G.993.2 standard and supports VDSL2 30a profile that features 100 Mbps of symmetric data rate over the existing copper wires. NV-802S is an ideal choice for ISPs and System Integrators that are looking for a high performance broadband solution for their triple play applications. It offers a user-friendly management interface that allows service providers to monitor and control their services in a highly secure and efficient way. With many powerful and advanced features, this Mini IP DSLAM is the perfect solution for deploying broadband access, IP Surveillance, Hospitality and MTU/MDU applications.


Traffic Flow QoS Ensuring for Application Services
The VDSL2 Switch contains robust QoS features such as port-based, 802.1p priority and IP TOS/DSCP. It guarantees the best performance of VoIP and video stream transmission and empowers the enterprises to take full advantage of the limited network resources.


IEEE 802.1q Q-in-Q VLAN for performance & security

The VLAN feature in the switch offers the benefits of both security and performance. VLAN is used to isolate traffic between different users and thus provides better security. Limiting the broadcast traffic to within the same VLAN broadcast domain also enhances performance. VLAN support enabling advanced techniques such as 802.1Q-in-1Q to be deployed. And support GVRP up to 4k V-LAN groups.


Selectable VDSL2 Data Rate for Service Differentiation
Through the management interface, the administrator can control the data rate of each VDSL2 port. Telecom and ISP can immediately and remotely upgrade/downgrade bandwidth service upon different demands.


Broadcast/Multicast/Unknown-unicast Storm Control

To limit too many broadcast/multicast/unknown-unicast flooding in the network, broadcast/multicast storm control is used to restrict excess traffic. Threshold values are available to control the rate limit for each port. Packets are discarded if the count exceeds the configured upper threshold.


Powerful Layer 2 Features
For efficient management, via Web interface, the NV-802S can be programmed for basic switch management functions such as port speed configuration, port link aggregation, IEEE 802.1Q VLAN and Q-in-Q VLAN, port mirroring, Rapid Spanning Tree and ACL security. Additionally, the firmware includes advanced features such as IGMP snooping, QoS (Quality of Service), broadcast storm and bandwidth control to enhance bandwidth utilization.

Enhanced Security
The VDSL2 switch offers comprehensive Layer 2, Layer 3 and Layer 4 Access Control List (ACL) to filter out unwanted traffic. Its protection mechanisms comprise 802.1X RADIUS user and device authentication. Moreover, the VDSL2 switch provides MAC filter, Static MAC, and Port Security for enforcing security policies to the edge. Administrators can now build highly secure corporate networks have considerably less time and effort than before.


Different mechanisms to deal the noise with the installation environment

NV-802S has a variety of different anti-noise mechanism so managers can easily handle a variety of different noise environments, such as Trellis Coding, INP, UPBO, DPBO, Interleave delay and Echo cancellation.



• Support 8a, 8b, 8c, 8d, 12a, 12b, 17a and 30a full band profiles.
• Support 997 and 998 band plans.
• Supports Jumbo packet up to 9k byte.
• Supports interleave delay for noise resistant and data loss.
• Support trellis coding and INP(Impulse Noise Protection).
• Support Echo cancellation and Virtual Noise.
• Support UPBO(Upstream PBO) and DPBO(Downstream PBO).
• Supports traffic storm control.
• Support port mirroring (sniffer) and broadcast storm filtering.
• Support L2/L3/4 access control list(ACL).
• Supports port security with MAC address filtering.
• Supports DELT(Double-Ended Loop Testing).
• Supports high bandwidth up to 100Mbps within 0.3km (984 feet) for VDSL2 ports.
• Supports web based for remote management.
• Support In-Band/Out-of-Band management.
• Support HTTP/TFTP for firmware upgrade.
• Supports HTTPS (SSL) web management.
• Supports bandwidth management(rate control) from 128k to 100Mbps.
• Supports IEEE 802.1q tagging VLAN with Q-in-Q.
• Supports TOS to IEEE-802.1p with 4 priority queues with DSCP.
• Supports Multicast IP table/IGMP v2 with 512 groups.
• Support IEEE 802.1d STP / IEEE 802.1w RSTP & IEEE-802.1s MSTP.
• Support SNMP v1/v2/v3 RFC-1493 bridge MIBs, RFC-1643 Ethernet MIB, RFC-1213 MIBII.
• Support RMON groups 1(Statistics), 2(Alarm), 3(Event), 9(History).
• Support DHCP client and Relay & Option 82.
• Supports LLDP (Link Layer Discovery Protocol) protocol.
• Supports remote syslog.
• Supports quality of phone wiring detected with SNR(Signal to Noise Ratio) indicators.
• Supports surge protection and splitter on board.
* Specifications are subject to change without prior notice.




 Standard Conformance
 IEEE802.3/802.3u/802.3ab/802.3z standards
 ITU-T G993.2, G993.1,G994.1, G997.1 standards

  Regulatory Compliance:

 CE Class A

 RoHS compliance

 Hardware Specifications
 Physical Interface:
 2 x RJ-45 Gigabit TP / SFP combo port
 8 x RJ-45 connector for VDSL2 connection
 8 x RJ-45 connector for POTS/ISDN connection
 1 x console port
 LED indication:

 1 x Power LED

 2 x Link/Active/Speed/Duplex/Collision Status for Gigabit ports
 8 x VDSL Link/Sync. for VDSL2 ports

 Flow control:

 Full-duplex: IEEE 802.3x

 Half-duplex: Back pressure

 MAC address table:
 8K Entries
 VDSL2 Spectrum:
 138kHz ~ 30MHz
 Typical Power Consumption:
 37 Watts maximum
 POTS/ISDN pass filter
 0 ~ 120kHz
 Operating Temperature:
 0°C~ 50°C (32°F ~ 122°F)
 Storage Temperature:
 -20°C ~ 70°C (-4°F ~ 158°F)
 10 to 90% (non-condensing)
 Gross Weight:
 approx. 3.2 kg
 435mm x 255mm x 44mm (17.13" x 10.04" x 1.73")


* Specifications are subject to change without prior notice.



Last Mile of FTTx Deployment

The NV-802S is an ideal solution for FTTx (FTTB / FTTH, etc.) applications. It support high bandwidth over existing telephone wires in the “last mile” from the ISP / Telecom / Service Provider’s fiber node to the buildings and customers’ houses.

The Intelligent NV-802S provides a high speed, 100Mbps transmission over phone wiring over a single Internet account to provide simultaneous independent Internet access to multiple users. It is excellent for phone line network built under internet because the whole building could share the internet to the wider area network with minimum cost and get max efficiency.

Proper Installation: Campus、Hotel、Hospital、Office building、Apartment、Telecom.

VDSL2 Total Solution


Hospitality: Hotels, Resorts
MDU/MTU: Apartments, Hospitals, Dorms
Transportation: Trains, Stations, Airport
Small to Medium Enterprises, Medical and Educational Facilities





Release Date
July, 2011
Nov, 2014
  User's manual
  Performance Table




1. What is NV-802S related products?


NV-802S can fully compatible with NV-600A,NV-600W,NV-600AI, NV-600WI.


2. POWER indicator does not light up (green) after power on.


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.


3. Link indicator does not light up (green) after making a connection.


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.


4. Upstream bandwidth control failed.


NIC(Networking Interface Card) does not have flow control function.
Be sure the NIC(Networking Interface Card) supports flow control function.


5. The customer reported that bandwidth control did not work in either direction when the port was set to 1 on the ingress and 1 on the Down(egress). One of our new HP laptops should bandwidth control at around 125K on the download, but around 1.7Mbps on the upload. On my laptop, it was around 100K on the download and 225K on the upload. Is there a reason why we are seeing such varied results and has there been any other reported problem with this feature lately?


Regarding our VDSL2 IP DSLAM' principle of bandwidth control, which must rely on flow control to limit bandwidth over hardware, as long as client side doesn't support flow control, the upstream bandwidth control is invalid, so for this case, client side must support flow control function.


6. Why VDSL2 configure change invalid ?


After any change to VDSL2 configure. Line must be deactivated then activated once or reboot, then new configure will be valid.


7. Is that possible to use ADSL2+ modems with with the VDSL2 IP DSLAM ?
  1. Please Note that it is not possible to use ADSL2+ modems with the VDSL2 IP DSLAM, since ADSL2+ is based on ATM frame and our VDSL2 IP DSLAM is based on EFM frame. Two frames are not compatible.
8. Sometimes the CPE lose the connection to DSLAM.


Due to heavy noise of field environment or phone wiring does not meet specifications.
1. We strong recommend all VDSL2 ports must use 24 gauge with twisted pair phone wiring.
2. Please replace the head of RJ11 wiring, if it has been oxidized or damaged.
3. Using phone cable must be stretched straight, without using reel phone cable, this will cause heavy crosstalk noise.

4. If you would like to connect the telephone, please connect to the NV-802S POTS port or you can try parallel connect line port without through POTS port. Do not directly connect the telephone signal to the NV-802S LINE port, because it will cause heavy noise. 
5. If port link problem, please change band profile to long reach mode as 12a or 8d AnnexB.


9. Sometimes the IP DSLAM unstable.


Due to heavy noise or impulse noise of field environment caused unstable.
1. If NV-802S hangs up, please enable broadcast strom function.
2. If CPE happened sync issue, please configure interleave delay time to anti-noise.
3. Enable INP(impulse noise protection) to 8 or above and enable "Force INP" for preventing impulse noise.

1. Please note that enable interleave delay function will reduce a few vdsl2 bandwidth.
2. Interleave delay value must greater than or equal to INP value, otherwise VDSL2 will not establish a connection.
3. Please note you must deactivate then activate once on config port when you configure INP and interleave dalay value.


10. What is an acceptable SNR for VDSL2?


Higher SNR numbers represent cleaner signals with less noise.  In some instances interleaving can help raise the noise margin to an acceptable level.

< 6dB: An SNR of less than 6 dB usually will result in line issues.
7dB - 10dB: This is a decent SNR but doesn't leave much room for variances in line conditions.
11dB - 20dB: Most people who live within a short amount of distance from the VRAD (less than 1500 feet) will have an SNR within that range.  This will result in little to no sync problems. 20dB - 28dB: Outstanding SNR, you must have the VRAD as your next door neighbor.


11. I would like to fully understand the limitations of the low pass filter in the NV-802S (0-125Khz). Can you please cover this in more detail as I do not want this to affect these potential projects.


NV-802S working frequency is from 138khz - 30Mhz, and POTS ports build in a low pass splitter(0 -125khz), we found many kinds of PBX spectrum in hotel system, every hotel's PBX working spectrum was different, if hotel PBX spectrum is low than NV-802S POTS port, it means hotel's PBX spectrum doesn't conflict with NV-802S, but it is impossible. According with our experience that almost of Hotel PBX spectrum is high than POTS splitter, so only one method can do it, you can try parallel connect line port without through POTS port, for this method that PBX spectrum must not overlap NV-802S working spectrum, and please note you have to check hotel PBX system in advance when you will install a hotel.