Design of L2 Gigabit managed switches, 16 and 24 ports models


A manufacturer of network equipment.


To design a series of Gigabit network switches with Power-over-Ethernet (PoE) support. 16 and 26 port models in metal enclosures in the compact 1U form factor.


Promwad engineering team designed a custom managed L2 switches based on the Realtek 83xx chipset (CPU MIPS-4KEc 32bit@500MHz) and Linux kernel. 
L2 switch features:


  • Type: L2, managed
  • Form factor: 1U
  • MAC address table: 8K entries
  • RAM: 256 MB
  • Energy Efficient Ethernet: IEEE 802.3az


  • 24 x 10/100М Ethernet ports
  • 4 x Gigabit Ethernet ports
  • Power-over-Ethernet (PoE)

Features of level 2

  • 802.3x flow control
  • Loop detection
  • Port mirroring
  • IGMP snooping
  • QoS: 802.1p, DSCP
  • VLAN
  • 802.1q VLAN


  • Port-based authentication: 802.1x

Control & monitoring

  • OAM 802.3ah
  • Web-interface
  • Command Line Interface (CLI)
  • Telnet server
  • SNMP
  • Syslog & RMON


Project results

Our customer received a series of new products for simple network management.

Our scope of work included the following services:

— PCB design
— Mechanical design
— Thermal analysis
— Embedded software development
— Web interface for management and control