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Comparison between M-1250/M-1450, NS3100/NS3200, and NS3500 FE ports

  • Published on Oct 5, 2026
  • 2 minute(s) read
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Operating Condition/Mode M-1250/M-1450 NS3100/NS3200 NS3500
TAP External tap is supported; no support for internal tap. No negotiation with peer devices.
SPAN Dongles not required.
Inline fail-close Dongles not required for both ports to fail-close.
Inline fail-open (Default) Does not require external passive Fail-open Kit.
Inline fail-open (Active Fail-open Kit) Supported with ports configured in fail-close (no dongles). No dongles needed. Inline ports default configuration is Inline Fail Open. Not supported.
Link Failure - inline fail-close Ports fail-close and traffic is disrupted.
Link Failure - inline fail-open Ports are admin disabled, put into bypass, and no traffic is disrupted. Built in. Ports are admin disabled, put into bypass, and no traffic is disrupted. Built in. Ports are admin disabled, put into bypass, and no traffic is disrupted.
Link Failure - inline fail-open (Active) Ports are not admin disabled, put into bypass, and no traffic is disrupted. Not supported.
Port Speed/Duplex 10/100/1000, Full/Half only for 10/100.
Auto negotiation Supported and can be configured from the Manager. Not supported.
Sensor Power off - inline fail-close Ports fail-close and traffic is disrupted.
Sensor Power off - inline fail-open Ports fail-open, put into bypass, and no traffic is disrupted.
Warm reboot - inline fail-open (CLI reboot or reboot due to error and watchdog on) Ports are admin disabled and put in bypass before the Sensor reboots. No traffic is disrupted.
Warm reboot - inline fail-close (CLI reboot or reboot due to error and watchdog on) Ports remain enabled fail-close, traffic disruption till the Sensor is up.
Resetconfig Options to either restore defaults or to retain the current port configuration are available.
Port link LED interpretation - inline fail-open Green indicates up and inline; OFF indicates bypass.
Port link LED interpretation - inline fail-close OFF indicates down and traffic is disrupted.
Port link LED interpretation during reboot/Sensor power down - inline fail-open OFF indicates bypass and no traffic is disrupted.
Port link LED interpretation during reboot/Sensor power down - inline fail-close OFF indicates down and traffic disrupted.
Front panel LED for Normal/Bypass operations - inline fail-open Green indicates up and inline; OFF indicates bypass.
Front panel LED for Normal/Bypass operations - inline fail-close Always on (green), normal operation.
Front panel LED for Normal/Bypass operations - SPAN Always on (green), normal operation.
Front panel LED for Normal/Bypass operations - TAP Always on (green), normal operation.
Link Events Has support to control fail-open/bypass operation.
Port density 1A/1B through 4A/4B. 1 through 8. 1 through 4.
Auto MDIX support Supported by default (not configurable through CLI).
The Manager port configuration panel - link status color coding The color codes are:
  • Yellow - not active
  • Green - up
  • Red - enabled but down
  • Gray - disabled and down (applicable for inline fail-open only)
The Manager port config panel - Inline/Bypass status color coding Four separate bypass buttons, one button per port pair:
  • Green - inline
  • Yellow - bypass
The Manager port status at Link failure - inline fail-open Gray
The Manager port status at Link failure - inline fail-close Red
The Manager port status at Link failure - SPAN Red

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