NT4E-STD Network Capture Adapter


4 Gbps Hardware Acceleration

The NT4E-STD is a 4-port 1 Gbps accelerator that provides full line-rate data capture and nanosecond precision time-stamping capabilities that can accelerate network applications and off-load the server CPU.

Accelerate Your Time-to-Market, Reduce Risk
Napatech Software Suite provides an efficient migration path by allowing you to mix and match ports and speeds. An advanced cooling design assures the required airflow while sensors monitor voltage, power, and temperature.


Our solutions deliver data to applications that monitor critical Ethernet/IP connections in real time, as a supplement to information provided by traditional network nodes and interfaces. This improves underlying network performance and availability.


Our solution delivers data to applications that analyze streaming quality and transaction performance. These applications enable an agile, data-driven approach to improving services and the quality of customer experience.


Our solutions deliver data to applications that monitor and troubleshoot all network activity in real time, enabling analysis of network performance metrics from multiple locations in the network. This helps network managers to optimize infrastructure efficiency.


Our solutions deliver data to applications that provide access to all information that has passed through the network in the order it was received. This allows network managers to comply with regulations, as well as analyze problems from historical data. It also allows them to take actions that will prevent problems from recurring in the future.


Napatech accelerators are highly optimized to capture network traffic at full line-rate, with almost no CPU load on the host server, for all frame sizes. Zero-loss packet capture is critical for applications that need to analyze all the network traffic. If anything needs to be discarded, it is a matter of choice by the application, not a limitation of the accelerator.

Standard network interface cards (NICs) are not designed for analysis applications where all traffic on a connection or link needs to be analyzed. NICs are designed for communication where data that is not addressed to the sender or receiver is simply discarded. This means that NICs are not designed to have the capacity to handle the amount of data that is regularly transmitted in bursts on Ethernet connections. In these burst situations, all of the bandwidth of a connection is used, requiring the capacity to analyze all Ethernet frames. Napatech accelerators are designed specifically for this task and provide the maximum theoretical packet capture capacity.


The ability to establish the precise time when frames have been captured is critical to many applications. 

To achieve this, all Napatech accelerators are capable of providing a high-precision time stamp, sampled with 4 nanosecond resolution, for every frame captured and transmitted.

At 10 Gbps, an Ethernet frame can be received and transmitted every 67 nanoseconds. At 100 Gbps, this time is reduced to 6.7 nanoseconds. This makes nanosecond-precision time-stamping essential for uniquely identifying when a frame is received. This incredible precision also enables you to merge frames from multiple ports on multiple accelerators into a single, time-ordered analysis stream.

In order to work smoothly in the different operating systems supported, Napatech accelerators support a range of industry standard time stamp formats, and also offer a choice of resolution to suit different types of applications.

  • 64-bit time stampformats:
  • 2 Windows formats with 10-ns or 100-ns resolution
  • Native UNIX format with 10-ns resolution
  • 2 PCAP formats with 1-ns or 1000-ns resolution


Napatech accelerators provide on-board memory for buffering of Ethernet frames. Buffering assures guaranteed delivery of data, even when there is congestion. There are three potential sources of congestion: the PCI interface, the server platform, and the analysis application. 

PCI interfaces provide a fixed bandwidth for transfer of data from the accelerator to the application. For some accelerators, this can limit the amount of data that can be transferred from the network to the application. For example, an 8-lane PCIe Gen3 interface can transfer up to 50 Gbps of data to the application. If the network speed is 100 Gbps, a burst of data cannot be transferred over the PCIe Gen3 interface in real time, since the data rate is twice the maximum transferable rate that can be transferred over the PCIe Gen3 interface. In this case, the onboard packet buffering on the Napatech accelerator can absorb the burst and ensure that none of the data is lost, allowing the frames to be transferred once the burst has passed. 

Servers and applications can be configured in such a way that congestion can occur in the server infrastructure or in the application itself. The CPU cores can be busy processing or retrieving data from remote caches and memory locations, which means that new Ethernet frames cannot be transferred from the accelerator. 

In addition, the application can be configured with only one or a few processing threads, which can result in the application being overloaded, meaning that new Ethernet frames cannot be transferred. With onboard packet buffering, the Ethernet frames can be delayed until the server or the application is ready to accept them. This ensures that no Ethernet frames are lost and that all the data is made available for analysis when needed.


Full line-rate transmit is an important capability for a number of test and analysis applications. Testing network performance under maximum load is increasingly important to not only assure quality of experience, but also to harden networks against attacks, such as Distributed Denial of Service (DDoS) attacks. 

Napatech accelerators make it possible to build solutions where the maximum transmission capability can be achieved to thoroughly test network resilience.

With Napatech accelerators, the frames to be transmitted are either generated by the application, replayed frames that were previously captured to disk, or retransmitted frames received in an in-line configuration.

Frames that are generated for transmission, or host-based transmit, allow frames to be generated by the host and transmitted at line speed on the network. This is useful for load-testing of networks and devices or simulating network behavior for network management and security testing. Timing can be important in these cases to ensure that the right frames are transmitted at the right time and in the right order.

Replay-from-disk allows previously captured frames to be analyzed for troubleshooting or security purposes. In this case, it is important that timing is preserved to accurately recreate what happened. It can also be useful in these cases to change behavior to simulate different situations. For example, it can be useful to manipulate the inter-frame gap (IFG) to speed up or slow down transmission.


  • Standard: IEEE 802.3 1000/100/10 Mbps Ethernet LAN
  • Physical interface: 4 x SFP ports


  • 1GBASE-SX (Multi-mode, 850 nm)
  • 1GBASE-LX (Singlemode, 1310 nm)
  • 1GBASE-ZX (Singlemode, 1550 nm)
  • 1000BASE-T
  • 10/100/1000BASE-T


  • Capture rate: 4 x 1 Gbps
  • Transmit rate: 4 x 1 Gbps
  • CPU load: < 5%

IEEE 1588-2008 (PTP v2)

  • NO


  • Resolution: 10 ns


  • PCAP-ns/-μs
  • NDIS 10 ns/100 ns
  • UNIX 10 ns


  • No


  • N/A


  • Bus type: 4-lane 2.5 GT/s PCIe Gen1
  • PCIe performance: 6.3 Gbpsfullduplex
  • Onboard: 1, 2 or 4 GB DDR2 (SO-DIMM 200-pin)
  • Flash: Support for 2 bootimages


  • RMON1 counters plus jumbo frame counters per port
  • Frame and byte counters per color (filter) and per host buffer
  • Counter sets always delivered as a consistent time-stamped snapshot


  • Power consumption: 22 Watts including SFP SX modules
  • Operating temperature: 0° to 45°C (32° to 113°F)
  • Operating humidity: 20% to 80%
  • MTBF: 266,329 hours according to RIAC-HDBK-217Plus


  • Temperature
  • Voltage


  • Linux
  • FreeBSD
  • Windows


  • Easy-to-integrate NT-API
  • libpcap support
  • WinPcap support


  • ½-length PCIe
  • Full-heightPCIe


  • CE
  • CB
  • RoHS
  • cURus (UL)
  • FCC
  • CSA
  • VCCI


Napatech Software Suite

Napatech Product Overview

Napatech Time Precision Performance

We are happy to advise you and look forward to