Observer nTAPs : Observer nTAPs : nTAP Models : Aggregator nTAPs : Optical-to-Copper Aggregator
Optical-to-Copper Aggregator
Decide where to place the nTAP and physically mount it, if desired. Depending on the form factor purchased, this may be in a drive bay, rack mount bracket, or wherever it is most convenient.
Keep the nTAP horizontal for efficient heat dissipation.
The Optical-to-Copper Aggregator nTAP splits the full-duplex signals, allowing the monitoring device access to the data stream while maintaining uninterrupted data flow through the monitored link. The optical network side does not require external power to function, however the copper analyzer side does require power. If you were to lose power, the network side is unaffected.
When traffic comes in to Link A, two copies are made in the TAP. One copy is sent out Link B to the switch and the other copy is joined with a copy of the traffic from Link B and sent out the Analyzer AB ports to the analysis device(s). A similar thing happens with traffic that comes in Link B. Two copies are made. Due to how the TAP is designed, it is not possible for traffic from the Analyzer side to pass to the Link side.
Figure 24: Cabling the Optical-to-Copper Aggregator nTap/>
Caution: Before you temporarily break the link between the device of interest and the network, you may want to shut down access to that device and notify users of the down time.
1. Ensure that power is connected to the nTAP. You can provide power to one or both power supply sockets on the back panel of each nTAP. Connecting both sockets to different external power sources provides fail-safe power redundancy for the Analyzer side.
2. Disconnect the cable from your device (typically a switch) and connect it to Link B. You want to connect Link B first because it negotiates its network speed first, and Link A then must use the same speed as Link B. If your link is part of a failover or redundancy arrangement, then connect the failover device to Link B.
3. Use another full-duplex cable to connect the network device (or primary device in a failover arrangement) to Link A port, thus completing the pass-through link.
4. Connect the Analyzer ports on the TAP to the receiving ports of the monitoring device. See Are the analyzer ports “send only”?
Note: The role of the buffer is to absorb traffic spikes of over 50% full-duplex bandwidth saturation (100% with both sides combined), because the analyzer’s single-receive interface cannot receive the traffic fast enough to keep up at line rate. For more details about the Aggregator TAP’s buffer, see Choosing the Aggregator TAP buffer size
An Optical-to-Copper TAP is used when the analyzer communicates over a different topology than the network. The TAP has an optical input on the Link side and a copper output on the Analyzer side. This TAP only functions on 1 Gb networks. For details about the split ratios, which are set at the factory before the TAP is shipped, see Determining the best split ratio for you.
All Optical TAP devices contribute to optical attenuation. See a fuller discussion of it in Attenuation.
Technical specifications
This section lists the dimensions, power requirements, supported media, and environmental requirements.
This action lists the dimensions, power requirements, supported media,and environmental requirements.
Both power connectors are located on the back panel, along with the model information and serial number.
Power requirements
AC Input
100-240V 50/60Hz 0.5A
Operational Voltage
5V (+10%/-5%, < 100 mV ripple)
Operational Current
Typical: <= 1.8 amps; Max: <= 2.8 amps
Power Dissipation
Typical: 8 watt; Max: 14 watt
Environmental requirements
Temperature range
32° - 113° F/0° - 45° C (Operating): The fanless cooling design relies on conduction and convection from the nTAP casing. Your installation environment must provide enough cool airflow for the nTAP casing to maintain an operating temperature less than 113°F/45°C.
-52° to +185°F / -47° to +85°C (storage)
35-85% (non-condensing)
Supported media
Multimode or Single-Mode
Fiber diameter
Multimode: 50/125 µm or 62.5/125 µm
Single-mode: 9/125 µm
Wavelength ranges
Multimode: 850 or 1300 nanometers
Single-mode: 1310 or 1550 nanometers
Copper Analyzer ports
Straight-through RJ-45 cable or crossover cable
Buffer size
256 MB, 512 MB, 1 GB (depending on TAP)
5.62 in/14.28 cm
1.15 in/2.93 cm
7.79 in/19.78 cm