Unmanaged Hardened Gigabit Ethernet PoE++ Switch
(4)10/100/1000Base-T PoE++ Ports + (1) 10/100/1000Base-T Port + (1) 100/1000Base-X SFP Slot

SISTP1040-551-LRT Unmanaged PoE+ Switch
  • SISTP1040-551-LRT Unmanaged PoE+ Switch
  • SISTP1040-551-LRT-front
  • SISPM1040-551-LRT-top
  • SISPM1040-551-LRT-back

This switch is an unmanaged full Gigabit Ethernet hardened PoE++ switch that complies with IEEE 802.3bt, IEEE 802.3at and IEEE 802.3af. The switch has (4) 10/100/1000Base-T PoE++ ports, (1) 10/100/1000Base-T port with (1) 100/1000 dual speed SFP slot. It can deliver up to 90 Watts on each PoE++ port simultaneously and also supports Power over HDBaseT (PoH) mode (95 Watts) when enabled by DIP switch. The SISTP1040-551-LRT can be used to power PoE lighting, high powered IP cameras and digital signage. It has redundant input power connections to ensure safe reliable operation in temperatures between -40°C and +75°C.


SISTP1040-551-LRT Overview


  • Layer 2 wire-speed switching engine
  • Auto MDI/MDI-X
  • Power alarm
  • Broadcast storm control
  • Support Jumbo Frame up to 9K bytes
  • PSE Link pass through
  • Flow control (when link partner has flow control enabled)
  • Ruggedized metal closure
  • Fan-less design
  • Wide operating temperature range (-40°C to +75°C)
  • Dual Power input
  • Din Rail and Wall Mount options

PoE Features

  • IEEE 802.3bt compliant
  • IEEE 802.3at compliant
  • IEEE 802.3af compliant
  • Power over HDBaseT (PoH) mode

SISTP1040-551-LRT Tech Specs


    • IEEE 802.3
    • IEEE 802.3u
    • IEEE 802.3z
    • IEEE 802.3x
    • IEEE 802.1p
    • IEEE 802.3af
    • IEEE 802.3at
    • IEEE 802.3bt


    • CSMA/CD


    • Store-and-forward switching architecture

    Switching Capacity

    • 12 Gbps


    • (5) 10/100/1000Base-T RJ-45 ports
    • (1) 100/1000Base-X SFP slot

    MAC Address

    • 2K MAC address table

    Status LEDs

    • Power 1&2, Alarm, Link/act/speed, PoE

    DIP Switches

    • SW1 (Power): Power alarm On/Off
    • SW2 (broadcast): broadcast storm limit ON/Off
    • SW3 (Jumbo): Jumbo Frame Support On/Off
    • SW4 (PoE): On – PoH Mode, OFF- 802.3bt Mode
    • SW5: (LPT) PSE LPT On/Off


    • Width: 2.4” [62 mm]
    • Depth: 4.1” [105 mm]
    • Height: 5.1″ [130 mm]

    Reset button

    • Reset the switch

    Power Input

    • 48-57 VDC; Redundant input; reverse power protection; 54 – 57VDC for PoE++

    Power Consumption

    • 5 Watts (without PoE)


    • Total PoE Budget: 360 Watts
    • 90 Watts on all 4 ports simultaneously

    Ingress Protection

    • IP30


    • Operating: -40°C to +75°C
    • Storage: -40°C to +85°C
    • Humidity: 5% to 95% (non-condensing)


    • 2.10 lbs [0.95 kg]


    • > 25 years


    • EMI: CE, FCC Part 15;
    • Safety: EN62368-1, UL62368-1


    • 5 Years

SISTP1040-551-LRT Resources

Application Spotlights
Press Releases
Case Studies

SISTP1040-551-LRT Downloads

Note: Some Documentation may have Transition Networks named or pictured. Transition Networks was acquired by Lantronix in August 2021. Learn more about the acquisition here.

SISTP1040-551-LRT Part Numbers

SISTP1040-551-LRT SISTP1040-551-LRT

(4) 10/100/1000Base-T PoE++ [100 m/328 ft.] ports + (1) 10/100/1000Base-T [100 m/328 ft.] port + (1) 100/1000Base-X SFP slot (empty) (Din Rail Bracket included)

Lantronix Part # Name Description Order Now

Compatible Accessories

Lantronix Part # Legacy Part # Name Description Order Now
SFP Modules SFP Modules See Relevant SFP Modules
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