Diamond Systems EPS-12000-CMH Wide Temperature Compact Layer 2 12 Port Gigabit Ethernet Switch Board with Heat Spreader

A sealed avionics or vehicle enclosure has little airflow for a finned heat sink, so a switch inside it has to pass its heat into the enclosure wall. The EPS-12000-CMH is the Layer 2 heat spreader build in the Diamond Systems EPS-12000-CM series: a small form factor Ethernet switch board that stacks Diamond’s EPSM-10GX switch module on a same-size carrier holding the power supply and magnetics.

It provides 12 10/100/1000 copper Ethernet ports with non-blocking wire-speed performance, all on latching connectors in place of RJ-45 jacks. WebStaX Layer 2 software is loaded as standard. An embedded processor runs the switch, managed through an in-band web interface over an Ethernet port or an out-of-band command-line interface over RS-232. The board works as a standalone switch or with a host computer and ships with all firmware loaded, so it runs without development work.

Switching features include 8K MAC addresses, 4K IEEE 802.1Q VLANs with push and pop of up to two tags, 8K IPv4 and IPv6 multicast groups, jumbo frames at all speeds, IEEE 802.3ad link aggregation, RSTP and MSTP, and 8 priorities with 8 CoS queues per port. MEF E-Line, E-LAN and E-Tree services and VeriPHY cable diagnostics are also listed, and our guide to VLANs explains how to separate traffic on a switch like this. The EPS-12000-CM is the same switch with a heat sink, and the EPS-12000-CMH-1588 runs IStaX Layer 3 software with a heat spreader.

A built-in wide-range DC supply accepts industrial and vehicle power, and consumption is 11 W at 12 V input. ActiPHY and PerfectReach power down unused ports and cut drive power on short cables. The board operates from -40 to +85 °C; a heat spreader mounts directly to the enclosure wall for conduction cooling. The CK-EPS12000 cable kit adds a serial cable to DB9, a power cable and three 4-port Ethernet cables.