Description
Product Introduction
The Hirschmann RS20-0800S2S2SDAUHC is a compact 8-port Managed Industrial Fast Ethernet switch designed for rugged DIN-rail installation. Built on Hirschmann’s proven OpenRail platform, this specific configuration features 6 copper 10/100 Fast Ethernet ports and 2 optical single-mode SC fiber ports, enabling deterministic network ring topologies over extended physical distances across industrial plants.
Unlike unmanaged commercial switches that flood networks with broadcast traffic and drop packets during electrical surges, the RS20-0800S2S2SDAUHC runs Hirschmann’s Enhanced Management software (indicated by the “HC” suffix). It delivers sub-20ms ring redundancy (HIPER-Ring, MRP), robust VLAN segmentation, and SNMP network management inside an IP20 fanless housing rated for hazardous locations
Key Technical Specifications
| Parameter | Specification |
| Total Port Count | 8 Ports |
| Copper Ports | 6 x 10/100BASE-TX, RJ45 (Auto-crossing, Auto-negotiation) |
| Fiber Ports | 2 x 100BASE-FX, Single-Mode SC Connectors |
| Fiber Distance / Wavelength | Single-Mode (9/125 µm), up to 30 km range, 1310 nm |
| Software Level | Enhanced Management (HC = High Software Suite) |
| Operating Voltage | Dual 12 to 24 VDC redundant power inputs |
| Redundancy Protocols | HIPER-Ring, MRP (Media Redundancy Protocol), RSTP (IEEE 802.1D-2004) |
| Operating Temperature | 32°F to 140°F (0°C to +60°C) |
| Mounting & Enclosure | DIN Rail Mount, IP20 Polycarbonate/Metal Housing |
| Hazardous Approvals | cULus 1604 Class 1 Div 2, ATEX Zone 2 |
Application Scenarios & The “Trench” Experience
It’s 1:45 AM at a remote water treatment facility. Lightning strikes near the secondary pump house 5 miles away. The transient surge induces a ground potential rise that would instantly blow out standard copper Ethernet switches. Because this long-haul link was built with a Hirschmann RS20-0800S2S2SDAUHC using single-mode optical fiber, the isolation barrier holds, keeping the fiber core completely immune to ground loops and electrical interference. However, a local power supply failure at the substation dropped one of the redundant DC feeds. The switch immediately closed its fault relay, alerting SCADA while continuing to pass process data on the surviving power bus.
- Water & Wastewater Treatment – Long-Distance Substation Links – Connects distant pump stations up to 30 km apart using single-mode SC fiber while suppressing lightning surges.
- Oil & Gas Processing – Class 1 Div 2 Refineries – Operates safely inside hazardous areas to network remote I/O racks and flow computers over redundant HIPER-Ring architectures.
- Transportation & Railway Infrastructure – Trackside Signaling – Delivers sub-20ms network reconfiguration times during fiber line breaks, ensuring zero signal dropouts for train control units.
Field Case Study:
A pipeline compressor station in Alberta experienced intermittent network dropouts on an unmanaged switch ring during extreme winter load spikes. The network suffered from broadcast storms and zero diagnostics. We dispatched a verified surplus RS20-0800S2S2SDAUHC switch. The network administrator configured MRP redundancy and VLANs via Industrial HiVision, swapped the unit onto the DIN rail, and eliminated the intermittent drops permanently. The plant saved an estimated $110,000 in unscheduled downtime over the following quarter.
RS20-0800S2S2SDAUHC
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Hirschmann network racks.
- Inbound Physical Inspection: Inspection of the front panel RJ45 jack spring pins, verification of optical SC connector clean faces, and checks on the removable terminal block connectors.
- Dual Power Supply & Boot Check: Powering the unit via redundant VDC input terminals (V1+ and V2+) to confirm clean bootloader sequence and diagnostic LED operation (Power, Fault, Port Status).
- Optical & Copper Transmission Testing: Attaching optical attenuators and single-mode patch cables across both SC ports to test optical RX/TX power levels while running 100 Mbps full-duplex throughput tests on all 6 copper ports.
- Firmware & Management Reset: Connecting via the V.24 serial port to verify the HiEOS software build, clear legacy configurations, and restore factory defaults.
- Anti-Static & Secure Packaging: Dust caps applied to SC optical transceivers, ESD clearing, anti-static bag sealing, and custom high-density foam wrapping before dispatch.
The Veteran’s Tech Trap Guide
⚠️ Clean Your Fiber Connectors Before Insertion:
Never insert an uncleaned single-mode SC fiber patch cable into the “S2” optical ports. Microscopic dust particles on the ferrule tip will pit the internal transceiver optics under high laser intensity, causing high bit-error rates (BER) or permanent port degradation.
❗ Mind the “S2” Single-Mode vs. “M2” Multi-Mode Model Codes:
Double-check your existing cable plant before ordering. The model string “S2S2” denotes Single-Mode fiber ports (1310 nm). If your field cabling is Multi-Mode 62.5/125 µm (which requires an “M2M2” card), plugging it into this single-mode switch will cause massive optical signal attenuation and link failure.
⚠️ DIP Switch Settings for Fault Relay:
Take a look at the front-panel DIP switches (if enabled). If you do not wire both redundant power feeds (V1 and V2), the internal fault relay will trip by default, throwing a persistent red “FAULT” LED. Set the DIP switch to ignore the missing second power supply if you are running single-source DC power.
❗ HiEOS Feature Level Differences:
The “HC” suffix stands for Enhanced Management (High). If you drop this into a ring network configured with standard “Basic” (BC) switches, ensure your master/slave ring configuration settings (like HIPER-Ring Manager vs. Redundancy Manager) match your network hierarchy in Industrial HiVision.
Frequently Asked Questions
Q: What do the letters “S2S2SDAUHC” stand for in the part number?
A: S2/S2: Two Single-Mode SC Fast Ethernet fiber ports. SD: Standard temperature range (0°C to +60°C). AU: Approvals (cULus 508, cULus 1604 Class 1 Div 2, ATEX Zone 2). H: Enhanced Management software suite. C: Standard Hirschmann software version configuration.
Q: Can I manage this switch using a standard web browser?
A: Yes. The RS20-0800S2S2SDAUHC features an embedded web interface (HTTP/HTTPS), as well as support for SNMP v1/v2c/v3, Command Line Interface (CLI) via SSH/Telnet, and Hirschmann’s Industrial HiVision software.
Q: Does this switch support Gigabit speeds?
A: No. The RS20 series is a Fast Ethernet platform (10/100 Mbps). If your network architecture requires Gigabit uplinks, you need the Hirschmann RS30 or MS20/MS30 series.
Q: Is it safe to hot-swap the terminal power block or RJ45 lines?
A: Yes, the Ethernet ports and 24 VDC screw terminal plug can be removed while power is applied, provided local plant safety rules permit it. However, if installed in an explosive Class 1 Div 2 environment, ensure the atmosphere is known to be non-hazardous before disconnecting wiring.
Q: Why buy new surplus instead of waiting for a new Hirschmann factory order?
A: Factory lead times for specialized managed switches can span several months. Purchasing a factory-sealed surplus unit allows you to replace a damaged switch immediately, keeping your network online without modifying your validated network topology.
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