The Netropy 40G is the only WAN emulator capable of simulating 40 Gbps links. The 40G comes with two QSFP 40GbE ports for emulation and can handle an aggregate of 80 Gbps, making it ideal for testing cloud computing, storage replication and synchronization, media asset distribution, telepresence, and other applications that rely on high-speed networks.

In addition simulating a single link up to 40 Gbps, the Netropy 40G can simulate up to fifteen separate WAN links, with packets assigned to the various links by IP address range, VLAN, or any other packet identifier, making it possible to simulate four 10 Gbps links or fifteen lower speed links all within a single 1U-sized device.

For users without an immediate need to simulate 40 Gbps links, a version is also available at a maximum emulation speed of 10 Gbps per WAN link, offering a lower-cost alternative for testing multiple 10 Gbps links and providing an easy upgrade path to 40 Gbps.

The Netropy 40G is configured and managed through an intuitive, browser-based interface for easy operation, or through a comprehensive command line interface for integration with test automation tools.


  • •  Bandwidth
  • •  Latency & jitter
  • •  Packet loss
  • •  Congestion
  • •  Other impairments

Netropy 40G Capacity

  • •  One 40 Gbps Emulation Engine, up to 15 separate WAN links
  • •  Packets assigned to individual links by IP address, VLAN, application port number, or any other packet field
  • •  80 Gbps aggregate capacity
  • •  Two QSFP 40GbE ports
  • •  Compact 1U-sized appliance
  • •  Modular redundant power supply

Easy to Use

The Netropy 40G Network Emulator is quick to install, intuitive to configure, and easy to operate. The Netropy GUI provides the responsiveness of an application with the convenience of a standard web browser.

Multiple Links

The Netropy 40G simulates up to 15 separate WAN links, making it easy to simulate large numbers of gigabit or other high-speed links through a single pair of ports. Packets are assigned to individual links by IP source and destination address range (IPv4 or IPv6), VLAN, MAC address, MPLS label, application port number, or any other packet field.

Bandwidths up to 40 Gbps

Accurately simulate links from 100 bits per second up to 40 Gbps. Also available in a 10 Gbps version for users who need to emulate many lower speeds links or want the flexibility to upgrade to 40 Gbps later.

Latency up to 10 sec.

Emulate delay and jitter up to 10 seconds, in increments of 0.01 ms, with a constant, normal, exponential, or uniform distribution.

Packet Loss and Corruption

Set random, burst, or periodic packet loss, or a bit error rate. Test the effect of data corruption on voice and video applications.

Capture and Replay Live Network Conditions

Capture live network conditions with the Netropy Recorder and replay them through the Netropy Network Emulator to reproduce the dynamic delay and loss characteristics of the production network in a repeatable test environment.

Replay PCAP Files as Background Traffic

Test how applications run over a congested network without costly traffic generators or a rack full of client machines using Netropy's unique background utilization feature that replays PCAP files as background traffic. Each PCAP stream can replicated to simulate large numbers of users or scaled to adjust the timing and bandwidth usage.

Data Visualization

Graph or download up to 24 hours of throughput and other link statistics to visualize and troubleshoot application performance.


Install each emulation engine as either a bridge or router for easy integration with any test configuration.

QSFP and SFP+ Compatibility

The Netropy 40G comes with two QSFP ports for 40 Gbps connectivity. An SFP+ adapter is also available to connect to 1 Gbps and 10G networks for flexibility to connect to any type of high-speed network.

Automated Testing

Automate testing using the comprehensive command line interface.

User Controls and Security

Use SSL or SSH for secure access to the Netropy interface. Individual users can lock their Emulation Engine to prevent configuration changes by any other user. Set user passwords on the device or take advantage of an LDAP server.

Unsurpassed Precision

Test with confidence - the high-precision Netropy Emulation Engine ensures accurate and reproducible results.

Self Monitoring

The Netropy Emulation Engine monitors internal processing and buffering resources to guarantee testing validity.

Redundant Power Supply

A modular redundant power supply helps guarantee uninterrupted operation.

Priced Right

Emulate 40 Gbps networks at a fraction of the cost of competing solutions. Also available in a 10 Gbps version for users who need to emulate four 10 Gbps links.

Everything You Need

Apposite makes buying easy by including everything in one low price. No additional hardware (except standard SFP+ or SFP transceivers), software, or training required.

With the ability to simulate one 40 Gbps link or up to 15 separate lower speed links, the Netropy 40G has a myriad of uses:

Emulate 40 Gbps Links

The 40G is capable of 40 Gbps bi-directional.

Emulate multi-site networks

Model a full enterprise network of regional, branch, and local offices, telecommuters, and partners, all connected to headquarters or centralized datacenter. The 40G can simulate up to 15 different WAN links to an aggregate of 40 Gbps in each direction.

  1. View applications as they will be seen by different end users
  2. Verify the operation of application servers with concurrent users

Side-by-side benchmarking

Run separate tests side-by-side to:

  1. View the effects of different conditions on application responsiveness
  2. Compare products from different vendors
  3. Tune application settings
  4. Analyze the benefits of acceleration and optimization products

Isolate individual applications

Segregate traffic from individual devices and apply impairments to specific applications

Concurrent testing

Complete a matrix of conditions by running multiple tests in parallel

User Interface

Netropy advanced network emulators are quick to install and easy to operate. Configuration requires only a few simple steps through the intuitive, browser-based GUI.


Netropy main configuration and monitoring window.

Path Configuration

Set the bandwidth, delay, loss, and other network conditions for each link in the Path Configuration window.

Classifier Configuration

Direct packets onto individual links by IP address, VLAN, or other packet fields in the Classifier Configuration window.

Network design

Build "what-if" scenarios to choose between private lines, internet VPNs, and wireless and satellite networks to connect offices across the globe, and determine how much bandwidth to purchase to ensure critical applications perform as needed.

Application validation

See how applications will perform prior to roll-out and avoid unpleasant surprises and panic fixes later.

Vendor selection

Compare products from different vendors to select the one that works best on your network.


Adjust application settings to optimize performance for different end users.


Analyze the benefits of WAN acceleration products to optimize the existing infrastructure.


Pinpoint the cause of reported problems and complaints, then validate potential solutions without disrupting the production network.

Emulation Capabilities
Packet Classification IP source and destination address range
IPv6 source and destination address range
VLAN ID and PCP prioritization value
IP ToS: Precedence or DSCP value
TCP or UDP port number
MAC address
MPLS address
Any arbitrary field specified by layer, offset, length, and mask
Bandwidth 100 bps to max. license speed (10 Gbps or 40 Gbps) in 1 bps increments
Latency & jitter 0 ms – 10,000 ms. in 0.01 ms increments;
constant, uniform, exponential, normal distributions with or without reordering
accumulate & burst delay;
replay recorded latency from Netropy Recorder or file
Loss and Corruption random, burst, periodic, BER, Gilbert-Elliott, or recorded packet loss;
data corruption
Queuing and Prioritization RED, tail drop, and round robin queue management;
Priority or Round Robin queuing based on IP ToS or VLAN PCP value
Additional packet reordering, packet duplication, MTU and fragmentation,
frame overhead, separate inbound and outbound rate control
Max. Link Emulation Speed Available in 10 Gbps and 40 Gbps versions. Emulate any speed up to licensed maximum.
Emulation Engines 1
Max. Aggregate Throughput 80 Gbps
Maximum Packet Rate 32 million packets per second aggregate (with 64 bytes packets)
16 million packets per second per port (with 64 byte packets)
Maximum Frame Size 9 KB
Emulation 2x QSFP 40 GbE
(SFP/SFP+ 1/10 Gbps adapter optionally available)
Management 1x Gigabit Ethernet (10/100/1000baseT)
1x RS-232 DB9 serial console
Environmental and Physical Specifications
AC Input Voltage Auto ranging 100 VAC to 240 VAC
AC Input Frequency 50 to 60 Hz
AC Input Current 1.6 A
Power Draw 190 Watts


28" D x 17" W x 1.75" H (1 RU)
72 cm D x 44 cm W x 4.4 cm H (1 RU)

34" x 24" x 8"
87 cm x 61 cm x 21 cm

25 lbs. (11 kg)
36 lbs. (17 kg)

50° to 95°F (10° to 35°C)
-40° to 158°F (-40° to 70°C)

20% to 95% (non-condensing)
5% to 95% (non-condensing)
Certifications FCC Class A, CE, RoHS
Warranty & Support
Hardware Warranty 1 year
Support and Maintenance 1 year, including all firmware upgrades
Ordering Information
Part Numbers 10 Gbps version: N40G-10G
40 Gbps version: N40G-40G