The Contemporary Controls EISK8-GT Skorpion Gigabit Switch is an 8-port unmanaged Ethernet switch that delivers true gigabit speed (10/100/1000 Mbps) on every port, with full plug-and-play operation, no IP address, no web interface, and no firmware setup. It accommodates bandwidth-intensive devices such as IP cameras, NVRs, and modern gigabit-preferring controllers, and supports Jumbo Frames up to 9216 bytes for protocols that benefit from oversized payloads. A half-wave rectified low-voltage power supply accepts 10-36 VDC or 24 VAC, allowing the switch to share a common 24VAC control bus with actuators, sensors, and other field devices. A writable side label lets the installer document each cable run right on the unit.
Gigabit Speed & Jumbo Frames
- ›10/100/1000 Mbps on all 8 ports
- ›1000BASE-T, 100BASE-TX, 10BASE-T signalling
- ›Jumbo Frame support up to 9216 bytes
- ›Store-and-forward, non-blocking wire-speed
- ›ANSI/IEEE 802.3 compliant
Plug-and-Play Operation
- ›Auto-negotiation of speed (10/100/1000) and duplex (half/full)
- ›Auto-MDIX accepts straight-through or crossover cables
- ›No configuration required: no IP, no firmware, no web UI
- ›Shielded RJ-45 connectors on all 8 ports
Flexible Power & Bus Sharing
- ›Wide-range input: 10-36 VDC or 24 VAC ±10%
- ›Half-wave rectified PSU shares 24VAC control bus
- ›Redundant power: DC + DC, AC + DC, or DC + AC backup
- ›Reverse-polarity protection on inputs
- ›Removable 4-pin power connector for fast servicing
Diagnostic LEDs & Build
- ›Power LED (green) for supply status
- ›Per-port "H" LED: green=1000 Mbps, yellow=100 Mbps
- ›Per-port "L" LED: yellow=10 Mbps
- ›"H" or "L" LED flashes during data transmission
- ›Rugged metal enclosure with metal DIN-rail clip
- ›Writable side label for cable documentation
| Specifications | |
|---|---|
| Ports | 8 × 10BASE-T/100BASE-TX/1000BASE-T, shielded RJ-45, Auto-MDIX |
| Data Rate | 10/100/1000 Mbps, auto-negotiated |
| Jumbo Frame Support | Yes, up to 9216 bytes |
| Switching Mode | Store-and-forward, non-blocking (full wire-speed) |
| IEEE Standard | ANSI/IEEE 802.3 |
| Power Input | 10-36 VDC (3 W) or 24 VAC ±10%, 47-63 Hz (7 VA) |
| Power Supply Type | Half-wave rectified, allows sharing of 24VAC/VDC control bus |
| Power Redundancy | Backup input supports DC or AC; reverse-polarity protected |
| Power Connector | 4-pin removable terminal block (COM / HI / HIB / chassis) |
| Operating Temperature | 0°C to +60°C (+32°F to +140°F) |
| Storage Temperature | -40°C to +85°C |
| Humidity | 10-95%, non-condensing |
| Protection Rating | IP30 |
| Mounting | TS-35 DIN-rail |
| Dimensions (W × D × H) | 41 × 95 × 100 mm (1.61 × 3.73 × 3.94 in) |
| Shipping Weight | 1 lb (0.45 kg) |
| Enclosure | Rugged metal, with integrated metal DIN-rail clip |
| Wire Size (Power) | 16-22 AWG solid, 16-18 AWG stranded |
| Regulatory | UL 508 Listed (Industrial Control Equipment), c-UL Listed, CE Mark, FCC Part 15 Class A, RoHS |
| UL 508A Compatibility | Directly acceptable as UL 508 Listed Industrial Control Equipment in UL 508A panels |
| Warranty | 5-year limited (Contemporary Controls) |
Frequently Asked Questions
Can the EISK8-GT be installed in a UL 508A control panel?
Yes. The EISK8-GT is UL 508 Listed and c-UL Listed for Industrial Control Equipment. UL 508-listed components are directly acceptable for use in UL 508A panels without invalidating the panel listing, as long as the device is supplied from a Class 2 limited-energy source per the panel's circuit requirements.
When do I actually need a gigabit switch instead of 10/100?
Gigabit makes a real difference when the network carries high-bandwidth traffic such as IP cameras, NVR video streams, large file transfers between PCs and servers, BIM/graphics workstations, or any link that aggregates traffic from many downstream 100 Mbps devices. For a typical BAS panel running BACnet/IP between controllers, 100 Mbps is more than enough — in that case the EISK5-100T or EISK8-100T (10/100) is more cost-effective. Choose the EISK8-GT when you have at least one gigabit-preferring device on the network or when the panel network is part of a larger gigabit infrastructure.
What does Jumbo Frame support actually do?
The EISK8-GT supports Ethernet frames up to 9216 bytes, much larger than the standard 1518-byte maximum. Larger frames mean fewer per-packet overhead operations, which improves throughput and reduces CPU load for traffic that natively uses big payloads — common in IP camera streams, storage protocols (iSCSI, NFS), and bulk data transfers. For ordinary BACnet/IP and Modbus TCP traffic the benefit is small, but the support is there if upstream devices use it.
Can I power the switch from my existing 24VAC control bus?
Yes. The EISK8-GT uses a half-wave rectified low-voltage power supply, which means it can share a common 24VAC source with other control devices such as actuators, valves, sensors, and thermostats. This is a notable advantage in BAS panel design where a single 24VAC Class 2 transformer often feeds the entire field-device bus.
Does the switch require any configuration?
No. The EISK8-GT is fully unmanaged and plug-and-play. It has no IP address, no web interface, and no firmware to set up. Each port auto-negotiates speed (10/100/1000) and duplex (half/full), and Auto-MDIX accepts either straight-through or crossover cables.
What do the H and L LEDs on each port indicate?
Every port has two LEDs. The "H" (high-speed) LED glows green for an established 1000 Mbps gigabit link, or yellow for a 100 Mbps link. The "L" (low-speed) LED glows yellow only when the link is operating at 10 Mbps. Whichever LED is active will flash when data is being transmitted or received. Together they give immediate per-port visibility into link state and negotiated speed without needing a managed switch.
How is the EISK8-GT different from the EISK5-100T and EISW8-100T?
The EISK8-GT is the only gigabit switch in this family: 8 ports at 10/100/1000 Mbps with Jumbo Frame support. The EISK5-100T is a smaller 5-port 10/100 switch in the same Skorpion line (same UL 508 listing, same 24VAC bus sharing). The EISW8-100T is an industrial 8-port 10/100 switch with a wider -40 to +75°C operating range, UL 62368-1 ITE listing, and a fault-relay output for power monitoring — choose EISW8 for outdoor/extreme environments where gigabit isn't required, and EISK8-GT when you need gigabit speeds in an indoor panel.
- Sub-Category:
- Unmanaged Switches
