What is Zero DelayTM?
Zero Delay
TM is a unique tap technology offered only by Net Optics that prevents
packet loss or delay should the Tap lose power. Zero Delay technology prevents link downtime by
eliminating the typical 10ms delay caused when other Taps lose power. That small delay can cascade
into much longer delays as devices on the link detect a failure and attempt to re-establish communication.
What is Link Fault DetectTM?
Link Fault
Detect is a Net Optics feature that gives devices connected to the Tap critical information about link status.
If either side of the bi-directional link fails, the Tap immediately communicates the fault to the other device,
reducing the time required to activate a redundant path. This technology is found on the Copper GigaBit
and 10/100/1000BaseT Taps and Bypass Switches. This is not available on the Copper Gigabit Port Aggregator.
What is Active Response?
Net Optics products with Active Response allow network personnel to set their network
devices to send active response packets such as TCP resets, ICMP messages, or ACL changes
into the tapped link. Normally, Tap monitor ports are transmit only and do not allow traffic
to flow back into the active link.
What is Fast PathTM?
Fast Path is a technology found in the Net Optics Bypass Switches that supports fail-open monitoring
with any Gigabit in-line device when it shares the same power source as the in-line appliance.
As long as the Bypass Switch is receiving power, it diverts network traffic to attached in-line devices.
When power is lost, Fast Path maintains network link integrity with high-speed switching so the
network link is maintained but is no longer routed to the in-line device.
What is PortRover software?
PortRover software is easy-to-use management software included with Net Optics Matrix Switches that
allows you to easily change links monitored by your network analyzers or RMON probes. Please contact
Tech Support at
if you need this software for your Matrix Switch.
Are Net Optics Taps passive devices?
All Net Optics copper taps are completely passive. Simple Fiber Taps require no power and are completely passive.
They are not a point of failure in the event of power loss. Net Optics also offers Zero DelayTM technology
on most 10/100 tap product lines which guarantees no packet loss if the Tap loses power. For more information on
Zero DelayTM please refer to the FAQ’s for Net Optics Technology.
I am monitoring my network segment via a Span (mirror) port on my switch.
How will I benefit by using a Net Optics Tap?Network Taps create permanent access ports
for passive monitoring by splitting or regenerating the full-duplex network signal. The monitoring device
connected to the Tap receives traffic as if it were in-line, including all errors. In contrast, a monitoring
device connected to a switch Span port does not see all traffic. Corrupt network packets, or packets below
minimum size, are usually dropped. Switches also eliminate Layer 1 and select Layer 2 errors, and are
constrained by the bandwidth capacity of the Span port. In addition, by using a Tap you put less load
on your switch buffer and can eliminate "resets" by the switch.
For more information, please download
the following white paper:
Technical Comparison: Taps vs. Span Ports
Do GigaBit Copper Taps support Gigabit speeds only, or up to 1000 Mbps?
The Net Optics GigaBit Copper Tap was designed to support 1000 Mbps only. Net Optics offers
a 10/100/1000 Copper Tap for flexible connectivity.
Do Net Optics Taps participate in link negotiation?All Fiber, WAN, and 10/100-based
Taps are pass-through devices that do not participate in link negotiation. Net Optics Gigabit Copper
and 10/100/1000 Taps negotiate a separate link each network device.
Do Net Optics taps support POE (Power Over Ethernet)?
Currently the 10/100 Taps (part number TP-CU) and the Teeny Tap (part number TP-CUTT-USB) are the
only taps that support POE. Net Optics 10/100/1000 Network Taps will support POE in the future.
I have a 10/100BaseT Tap and can’t get link established
through the Tap. Do I have it cabled correctly? When connecting Tap network
ports to Switches, Routers, and Hubs, use straight-through cables. Use a crossover cable and a
straight-through cable when you are connecting similar devices, such as Switch-Switch (DTE-DTE),
to the Tap. Use straight-through cables to connect hubs, switches, or NICs to the Monitor Ports.
I have installed a Net Optics Fiber Tap and verified
that network traffic is passing through the Tap but I do not see traffic coming out of the
Tap Monitor Ports. What should I check?
If the Transmit and Receive portions of your fiber optic cable are crossed on the Network Ports of the Tap, you will see traffic pass through the Tap but nothing coming from the Monitor Ports. Check to see that the cables going into the Network A and B ports on the Tap are as follows: TX = In, RX = Out.
I noticed Net Optics Fiber Optic Taps are offered in multiple
split ratios. Why would I need the different split ratios?
A split ratio is the amount of light that is re-directed from the network to the monitor ports.
With higher split ratios, less light is re-directed from the network link to the monitoring link,
ensuring adequate light power for the network link. Click on the following link to download
our Split Ratio Reference Chart:
Net Optics Fiber Split Ratio Reference Chart
What is the difference between ATM Fiber Taps and GigaBit Fiber Taps? Can they be used interchangeably?ATM Fiber Taps are manufactured and tested for use with an LED light source and GigaBit Fiber Taps are manufactured and tested for use with a Laser light source. You should avoid mixing Tap types to ensure insertion loss and split ration accuracy and prevent ATM Taps from being damaged by laser light.
I have had a Net Optics Fiber Tap for a couple of years and noticed that the light loss budget seems higher. Do the Fiber Taps go bad?Fiber components of Net Optics Fiber Tap’s are designed to last for the life of your installation. Dirty or loose connectors will cause a loss of optical power. Cleaning the connectors will restore light levels in most cases.
Will Net Optics Copper Taps work with Category 5, 5e, and 6 cables?Yes, Net Optics Taps work with all cable types. When mixing and matching different cable types, the connection will operate at the lowest rated cable. Net Optics recommends that you use Category 5e (CAT5e) cables or better with all Gigabit copper devices. All Net Optics copper Taps are shipped with CAT5e cables.
Does Net Optics offer any taps products for 10 Gigabit networks?Yes, Net Optics offers a full range of Tap and Regeneration (Span or In-Line) products for all 10 Gigabit interfaces including 10 GigaBit SR, 10 GigaBit LR, and 10 GigaBit ER.
I noticed that Net Optics offers 10 Gigabit taps and regeneration products in three different interfaces. How do I know which one to order?The three different interfaces are based on different laser sources and fiber core diameters. 10 GigaBit SR is designed for use with 850 nm lasers and comes in two different fiber core diameters, 50 um and 62.5 um. 10 GigaBit LR is designed for use with 1310 nm lasers and 8.5 um diameter fiber core. 10 GigaBit ER is designed for use with 1550 nm lasers and 8.5 um diameter fiber core. Below is a chart showing the technical specifications for the different interfaces.
What does iTap mean?
Intelligent is the “i” in iTap. The iTap concept is a new innovation that delivers more value to
our customers in the form of actionable information about network status. iTaps help network managers
to use their network security and monitoring devices more effectively, reduce response time to network anomalies,
and build a pervasively aware network.
How will iTap work with my RMON probes and analyzers?
iTap is not a replacement for these devices. iTap supports and complements RMON probes and analyzers
by making it easier to know where and when to use them. Although the iTap does provide network traffic
information, it is best at establishing baseline and early warning metrics.
How do I control the iTap and monitor traffic statistics?
iTap features a command line, browser, and SNMP interfaces for controlling the iTap and monitoring link
status information. The command line interface (CLI) is via an RS232 port and requires a computer with
terminal emulation software. The browser interface is Net Optics Web Manager and requires a computer
with any browser. The SNMP interface is Net Optics System Manager and requires a computer with
Windows 98 or later.
What control options does the iTap have?
Management Port and Monitor Port Control – To control access to the iTap, you can use the CLI to
turn off the Management Port, preventing access by Net Optics System Manager and other SNMP tools.
You can use any interface to turn off the Monitor Ports to prevent unauthorized access to the link via
the iTap. You also have the option to prevent the front-panel display from showing utilization and peak data.
Utilization – To trigger an alarm when utilization levels are too high, you set a threshold as a
percentage of bandwidth. When traffic levels pass this point, the alarm LED illuminates and alarms are
sent to remote interfaces.
Resets – At any time you can reset the Threshold Alarm LED, Peak Time,
Date, and clear all the statistical counters.
What information does the iTap provide?
The iTap provides status, utlization, and traffic statistics.
Status
• Link up or down
• Power on or off
• iTap internal error
Utilization
• Current utilization level
• Highest traffic peak
• Time and date of highest peak
Statistics
• Total Packets
• Total Bytes
• CRC Errors
• Packet Collisions
• Undersize Packets
• Oversize Packets
What alarms does the iTap have?The iTap has utilization threshold, link, power, and internal power alarms. The iTap indicates a threshold alarm from a LED in the front panel as well as the three interfaces. All other alarms are accessible from the remote interfaces. The iTap also supports SNMP traps for these alarms compatible with third-party SNMP tools.
Can I use iTap with my SNMP management tool?Net Optics Management Information Base (MIB) is compatible with all SNMP V2 tools. iTap SNMP functions work with HP OpenView and Tivoli.
Do you receive the full line rate data stream with Port Aggregators?
The Net Optics Port Aggregator Taps combine traffic from both sides of a full-duplex link and send all traffic, up to the capacity of the Monitor Port, to the attached monitoring device. When utilization levels exceed the capacity of the Monitor Port, the Port Aggregator Taps buffer overflow data and send this data as soon as utilization drops below the capacity of the Monitor Ports.
What are the memory options for the Port Aggregator Taps?
The 10/100 Port Aggregator contains 2MB (1MB each side) to handle buffer overflow when the cumulative utilization spikes above 100%. The GigaBit Fiber and Copper Port Aggregator Taps come standard with 64MB of onboard memory (32MB each side). There are optional memory options of 128MB and 256MB. iTap Port Aggregator’s are only offered with 256 MB of buffer memory
I noticed a Dip switch on the back of the 10/100 Port Aggregator Tap. What is that used for?
The Dip switch is used to set the negotiation parameters of the Tap. By default, the 10/100 Port Aggregator Tap is set to Auto-Negotiation. If your devices are set for fixed speed and duplex, it is recommended you set the Port Aggregator to match. For more information, see your Installation Guide.
Do you send all traffic to the Link Aggregator monitor ports?
Yes, all traffic is sent to the Monitor Ports until the sum of Span port traffic reaches the 1000 Mbps capacity of the Monitor Port. Any traffic above this threshold is dropped.
Is there any memory on the Link Aggregators?
Currently, we do not offer memory on the Link Aggregator Taps. However, we are working on adding memory in a future release.
What is a Regeneration Tap?Regeneration Taps
provide passive monitoring access for multiple devices. Net Optics' passive Regeneration
Taps enable real-time, simultaneous monitoring of a network link or Span port by up to eight
protocol analyzers, intrusion detection systems, and other devices for network monitoring and
troubleshooting.
Are Net Optics Regeneration Taps
passive devices?Yes, Regeneration Taps are completely passive devices.
How is a Regeneration Tap different from a Matrix Switch?
Regeneration Taps provide passive monitoring access for multiple devices.
Net Optics Matrix Switches provide passive monitoring access across multiple networks for
analyzers to perform real-time monitoring and analysis. Matrix switches greatly increase
monitoring efficiency and leverage analyzer investments.
What are the different options available with
Regeneration Taps?The Regeneration Taps come in 2, 4, and 8 monitor port versions.
They also support all major network interfaces such as 10/100, Gigabit, and WAN (OC3 and OC12).
Regeneration Taps also come in Span and in-line versions.
Span Regeneration Taps give users the ability to monitor up to two Span ports independently
with multiple resources, reducing the burden on your switch. The in-line models tap one
critical full-duplex link and make up to eight copies of that link.
What is a Bypass Switch?
Bypass Switches protect the link against power loss from the in-line IPS or security appliance.
When the Bypass Switch is receiving power, traffic is routed to the in-line appliance.
If power is lost or the appliance needs to be removed for maintenance, the Bypass Switch routes
traffic past the in-line device using Fast Path technology preventing link downtime.
See diagram below:
How does a Bypass Switch with Heartbeat work?
The Optical Bypass Switch with Heartbeat protects against power failure, physical link failure,
and application failure on the in-line appliance. The switch checks the path through the in-line appliance
by sending a packet every second from Monitor Port C. The switch validates the path when it receives the
packet on the Monitor Port D. If the switch does not receive the packet as expected three times in a row,
the switch automatically enters Bypass ON mode.
What is the heartbeat packet?
The heartbeat packet is a 64 byte IPX packet sent once every second from the Monitor Port C.
You can change the default timing of the heartbeat packet and the heartbeat packet from the bypass
switch CLI.
Packet Contents (Hex)
Description
-----------------------------
----------------
00 50 C2 3C 60 00
MAC DA Net Optics
00 50 C2 3C 60 01
MAC SA Net Optics
81 37
Packet Type IPX
FF FF 00 30 00 00 00 00
40 04 EC A2 C6 13 01 02
C6 13 01 01 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
82 A2 BA 71
CRC
Can you re-configure the Heartbeat interval?
Yes, you can configure the Heartbeat interval and also the numbers packets missed before the
Bypass Switch enters Bypass Enabled Mode. The Bypass Switch has an RS232 port and a command line
interface for programming Bypass Switch options. See the Installation Guide for complete information.
What is Active Response?
Net Optics products with Active Response allow network personnel to set their network devices
to send active response packets, such as TCP resets, ICMP messages, or ACL changes, into the tapped
link. Normally, Tap monitor ports are transmit only and do not allow traffic to flow back into the
active link.
Do all Net Optics products support Active Response?
No, only products designated Active Response support this feature. Currently, the 10/100 BaseT Port
Aggregator (Part Number’s PAD-CU-AR, PA-CU-AR and PA-CU-PCI-AR) and Regeneration Taps
(Part Number’s RGN-CU-AR-IL2, RGN-CU-AR-IL4 and RGN-CU-AR-IL8) support this feature.
Can the Active Response feature be turned off on the products
supporting Active Response?
Yes, the Active Response feature is enabled and disabled from a Dip switch on the back of the Tap.
On the single-port Active Response Taps, switch 8 enables/disables this feature. On the Regeneration
Active Response Taps, switch 4 enables/disables this feature. Below is an example of the Dip switch
for the single-port Active Response Tap:
Do you offer any Media Conversion products?
Yes, Net Optics has several different Media Conversion products. Click
here
to see the variety of Media Conversion products we offer.
Why do I need a Fiber Cleaning Kit?
If you want to achieve optimal performance for your fiber connections it is recommended that you
clean connections that may have been exposed to contaminants. Dirty connections can lead to additional
light loss when connecting fiber optic devices together. The Net Optics Cleaning Kit makes
cleaning connections a simple and reliable process.
What is in the Fiber Cleaning Kit?
The Net Optics Fiber Cleaning Kit contains a CLETOP cleaning device with and additional CLETOP roll
(good for 400 cleanings), cotton swabs, instruction manual and a handy carrying case.
Click here for more fiber optics cleaning kit information