Calnex SNE Ignite: Intrinsic Latency Values

The information in the below article relates to SNE Ignite version 1.x.x. For information relating to other versions, please contact Calnex product support at support@calnexsol.com.

The SNE Ignite hardware processes every packet received at the Ethernet ports. This introduces a small and consistent intrinsic latency to the packets while they are buffered within the SNE Ignite.

This intrinsic latency varies depending on the interface used and whether Jumbo Frame Mode is enabled (see table below). The intrinsic latency is the minimum delay value that can be configured for a given interface.

As such, any delay value configured will include the intrinsic latency.

E.g., with a data rate of 10 Gbit/s and Jumbo Frame Mode enabled, configuring a delay of 50 μs will apply 36 μs in addition to the intrinsic latency of 14 μs, for a total of 50 μs delay.

Interface

Configurable Data Rate(s)

Latency (Non-Jumbo Frame Mode)

Latency (Jumbo Frame Mode)

Interface

Configurable Data Rate(s)

Latency (Non-Jumbo Frame Mode)

Latency (Jumbo Frame Mode)

10G

500 Mbit/s

1 Gbit/s

10 Gbit/s

6.8 μs

14 μs

25G

25 Gbit/s

6.8 μs

8.85 μs