Key Technical Specifications
| Item | Specification |
|---|---|
| Model | 973G-1600RPSA-BK |
| Manufacturer | Etherwan (USA origin) |
| Product Type | Hardened Managed Layer 3 Ethernet Switch |
| Series | 973G |
| Ring Protocol | ITU-T G.8032 ERPS v2 (sub-50ms recovery) |
| Layer 3 Features | Static routing, RIP v1/v2, OSPF v2, VRRP |
| Power | Redundant power input (RPSA suffix indicates redundant power supply) |
| Operating Temperature | Industrial-grade wide temperature range (verify exact range with OEM datasheet) |
| Design | Fanless hardened construction |
| Management | Web, CLI, SNMP, serial console |
| Mounting | DIN-rail or rack-mount (verify with specific SKU) |
| Warranty | Limited lifetime warranty (Etherwan standard) |
Product Introduction
Industrial networks do not forgive cheap switches. One power glitch, one broadcast storm, and your entire control layer goes dark. The Etherwan 973G-1600RPSA-BK is built for exactly that scenario — a hardened, fanless, Layer 3 managed switch that sits in the cabinet and keeps running when commercial-grade gear would have died months ago.What makes this one worth specifying is the combination of ERPS ring protection and redundant power in a single unit. ERPS gives you sub-50ms ring recovery, which is fast enough that most PLCs and DCS controllers never notice the fault. The redundant power input means a single PSU failure does not take down the switch. I have seen plants lose an entire production cell because someone used a single-supply commercial switch in a dusty control room. This is the antidote to that mistake.
Quality SOP & Tech Pitfalls
The Lab Report (SOP):
Visual inspection first — checking the Etherwan label, model suffix, port condition, and chassis integrity. We verify redundant power inputs with a bench supply and confirm both power rails are accepted. If a test rack is available, we power the unit and verify LED boot sequence, console access, and basic port link activity. Firmware version is logged. Final packing is anti-static with nameplate photos.The Engineer’s Warning (Pitfalls):
The biggest mistake I see with Etherwan switches is assuming the suffix tells you everything. “973G” is the series, but the exact port layout and power options live in the suffix. Order the wrong variant and you get the wrong number of SFP slots or the wrong power input type. The second trap is ERPS configuration — if you drop this into an existing ring without matching the ERPS domain and ring ID, you can create a split-brain situation that takes down the entire ring. Photograph the existing switch configuration before removal.
Installation & Configuration Guide
1. Pre-Installation ⚠️
- Follow plant lockout/tagout procedures.
- Photograph the existing switch: port connections, VLAN assignments, ERPS settings, IP address, and power wiring.
- Verify the replacement model suffix matches the installed unit exactly.
2. Removal
- Label every Ethernet cable before disconnecting.
- Disconnect both power inputs if redundant power is wired.
- Release DIN-rail or rack-mount clips carefully.
- Inspect the mounting area for heat damage or corrosion.
3. Installation
- Mount the new 973G-1600RPSA-BK securely on DIN-rail or in the rack.
- Reconnect power to both redundant inputs — do not skip the second power feed. That is the whole point of the RPSA suffix.
- Reconnect Ethernet cables exactly as photographed.
- Verify SFP modules (if any) are seated properly.
4. Power-On & Testing
- Apply power to both inputs. Verify both power LEDs illuminate.
- Check the boot sequence LEDs for normal startup.
- Connect via console or web interface and verify the configuration loaded correctly.
- Test ERPS ring status — confirm the ring is healthy and no ports are in an unexpected blocking state.
- Verify Layer 3 routing tables if static routes or OSPF are configured.
- Ping test across the ring to confirm sub-50ms failover behavior.
Compatible Replacement Models
| Replacement Model | Compatibility Tier | Notes |
|---|---|---|
| 973G-1600RPSA-BK (exact match) | ✅ Drop-in | Exact hardware and firmware match. Copy configuration from old unit. |
| 973G series (different suffix) | ⚠️ Verify First | Same series, but port count, SFP slots, or power input may differ. Verify mechanical and electrical compatibility. |
| Etherwan EG97023 Series | ⚠️ Upgrade Path | Higher-end Layer 3 switch with 10Gb ports. Requires configuration migration and possibly rack space changes. |
| Non-Etherwan industrial switches | ❌ Not Recommended | ERPS domain compatibility, CLI syntax, and management features will differ. Migration requires full reconfiguration. |
Frequently Asked Questions (FAQ)
Q: Can I hot-swap this switch in a live ERPS ring?
No. Unlike a PLC I/O module, a managed switch is not designed for blind hot-swap in a ring topology. Pulling it out breaks the ring. Schedule a maintenance window and coordinate with the control team before swapping.Q: What does the RPSA suffix mean?
It indicates redundant power supply configuration. The exact input voltage and connector type should be verified against the Etherwan datasheet for this specific SKU. Do not assume it matches another 973G variant.Q: Does it support PROFINET or EtherNet/IP?
The switch passes any Ethernet traffic, including PROFINET and EtherNet/IP frames. However, it does not act as a PROFINET IO controller or EtherNet/IP adapter. It is a transparent Layer 2/Layer 3 switch that carries industrial protocol traffic.Q: What is the operating temperature range?
Etherwan hardened switches typically support wide industrial temperature ranges, but the exact specification for the 973G-1600RPSA-BK should be confirmed with the OEM datasheet. Do not assume -40 to 75°C without verification.Q: Can I use this as a direct replacement for a Cisco or Moxa switch?
Hardware-wise, yes — it accepts standard Ethernet cables and SFP modules. Configuration-wise, no. You will need to rebuild VLANs, ERPS rings, routing tables, and SNMP settings from scratch. The CLI syntax is not compatible with Cisco IOS or Moxa.Q: What warranty do you offer?
12 months from our side. Etherwan also provides a limited lifetime warranty on their hardware when purchased through authorized channels.Q: Does it require a license for Layer 3 features?
This depends on the firmware version and SKU. Some Etherwan switches ship with Layer 3 features enabled by default, while others require a license key. Verify with the OEM datasheet or console output before deployment.
