Network Visibility Solutions Frequently Asked Questions
Q: Does an nTAP require power?
Q: Will nTAPs drop packets?
Q: What split ratio do I need when deploying an Optical nTAP?
Q: Can I use standard cables with my nTAP?
To connect a monitoring device to an optical nTAP:
Split a duplex cable (or use two simplex cables) and connect one end of each of those sides of the cable to the "send" ports on the nTAP, and the other end of each of those sides of the cable to the "receive" ports on the monitoring device's NIC. We also offer a convenient analyzer (or splitter) cable to ensure this connection can be made without error.
Use standard straight-through RJ45 Ethernet cables (cross over cables cannot be used with 10/100 Copper nTAP).
Q: Do nTAPs comply with European standards?
Q: What is an SFP module?
Q: What is the connector type in the SFPs modules?
Q: What is the difference between single-mode (SM) and multimode (MM) cable:
Q: What do the labels SX and LX signify?
Q: What is signal attenuation and hw much attenuation does an nTAP cause?
A TAP attenuates the signal for two reasons:
- The connections and internal TAP cables absorb and refract a portion of the signal.
- A portion of the signal strength is "siphoned off" and sent to the analyzer. How much of the signal strength is redirected for analysis depends on the split ratio.
An optical split ratio must be designated for each optical TAP. In most cases, a 50/50 split ratio is ideal, providing sufficient light to the network and to the monitoring device. However, there may be special cases that require an alternative ratio in order to meet signal power needs. For example, if a TAP is cabled close to the analyzer NIC (network interface card), and the link under test requires a long cable run, you may want to provide more power back to the network than the monitoring device. However, it may be more appropriate to implement a repeater on that segment. If you do choose an alternate ratio, keep in mind that the signal has to be strong enough for it to be interpreted at the destination. The table below shows an example of attenuation caused by a TAP at different split ratios. The rate of TAP attenuation can vary by TAP manufacturer.
Maximum insertion loss per split ratio
|Split Ratio||Multimode 62.5 μm||Multimode 50 μm||Single-mode 9 μm|
|(1300 nm)||(850 nm)||(1300 nm)||(850 nm)||(1310/1550 nm)|
|50/50||3.9/3.9 dB||4.7/4.7 dB||4.5/4.5 dB||5.5/5.5 dB||3.6/3.6 dB|
Q: What is the return policy?
A: At Viavi Solutions we are focused on customer satisfaction, we allow refunds on products within 30 days of purchase (purchase date on the invoice), provided the product is complete, in working order and both the product and packaging material is undamaged.
All returns must have a valid RMA number issued and the RMA number prominently displayed on the outside of the return shipping box. Before returning an item please contact our Technical Support Group at 800-526-7919 (1-952-358-3800) to work through any technical issues, or to be issued an RMA number. Should the product be incomplete, damaged or the packaging is damaged, a restocking fee will apply.