Description
MOXA EDS-408A-MM-SC | 8-Port, 2-Fiber SC, 4 km
Product Introduction
When a plant network needs more than simple packet forwarding, an unmanaged switch can become the limiting component. The MOXA EDS-408A-MM-SC steps up to Layer 2 management while retaining a practical six-copper/two-fiber port arrangement for legacy and mixed-media industrial networks.
The hardware provides 6 × 10/100BaseT(X) RJ45 ports plus 2 × 100BaseFX multimode SC ports. On the management side, it supports features including VLAN, QoS, SNMP, RSTP/STP, IGMP, port mirroring, and Turbo Ring/Turbo Chain redundancy technologies. The multimode fiber interfaces have a specified 4 km typical distance, while the switch maintains a compact 53.6 × 135 × 105 mm DIN-rail-mountable form factor.
EDS-408A-MM-SC
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | MOXA |
| Model | EDS-408A-MM-SC |
| Series | EDS-408A |
| Network Layer | Layer 2 Managed |
| Total Ports | 8 |
| Copper Ethernet | 6 × 10/100BaseT(X), RJ45 |
| Fiber Ethernet | 2 × 100BaseFX multimode, SC |
| Fiber Type | Multimode |
| Typical Fiber Distance | 4 km |
| Typical Fiber Wavelength | 1300 nm |
| Switching Standards | IEEE 802.3 / 802.3u / 802.3x |
| Spanning Tree | STP / RSTP |
| VLAN | IEEE 802.1Q, port-based VLAN |
| QoS | IEEE 802.1p |
| IGMP | v1/v2 |
| MAC Address Table | 8K |
| Packet Buffer | 1 Mbit |
| Priority Queues | 4 |
| Maximum VLANs | 64 |
| Console | RS-232, 10-pin RJ45 |
| Management | SNMPv1/v2c/v3, SSH, HTTPS/SSL, Telnet, RMON |
| Redundancy | Turbo Ring / Turbo Chain / STP / RSTP |
| Alarm Relay | 1A @ 24VDC |
| Input Voltage | 12/24/48VDC |
| Operating Voltage | 9.6–60VDC |
| Power Inputs | Redundant dual inputs |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH, non-condensing |
| Housing | Metal |
| IP Rating | IP30 |
| Dimensions | 53.6 × 135 × 105 mm |
| Weight | 650 g |
| Installation | DIN rail / optional wall mount |
| MTBF | 1,277,138 hours |
| Warranty | 5 years |
Specifications above are from Moxa’s current EDS-408A documentation.
Application Scenarios & Pain Points
Managed Replacement for a Legacy Fiber Network
Without managed switching:
A basic switch can move packets, but it gives the maintenance team little visibility or control over VLANs, traffic priority, redundant paths, or network diagnostics.
With the EDS-408A-MM-SC:
The six copper ports can serve PLCs, HMIs, remote I/O, drives, and other Ethernet devices while the two SC multimode ports provide fiber connectivity between cabinets or network segments.
The switch supports VLAN, QoS, RSTP, SNMP, port mirroring, IGMP, and Turbo Ring/Turbo Chain functions.
Long Fiber Runs
The 100BaseFX multimode SC interfaces provide a specified typical distance of 4 km. Moxa lists 1300 nm as the typical wavelength for the multimode interface. Actual usable distance depends on fiber type, attenuation, connectors, and the complete optical link budget.
Redundant Industrial Network Architecture
When a switch sits between production equipment and the plant backbone, a single power feed can become an unnecessary failure point. The EDS-408A-MM-SC accepts redundant dual DC inputs, with an operating range of 9.6–60VDC.
That makes it suitable for cabinets using nominal 12V, 24V, or 48VDC control power.
Network Troubleshooting
Port mirroring and SNMP are useful when intermittent communication faults need to be isolated without dismantling the entire network. The switch also provides an RS-232 console interface for local access.
Harsh Industrial Installations
The standard EDS-408A-MM-SC is specified for -10°C to +60°C operation. For cabinets that regularly fall below -10°C or rise above +60°C, the is the relevant wide-temperature variant, rated -40°C to +75°C.
QA & Live Testing SOP
For a managed Ethernet switch, checking the power LED is nowhere near enough.
A proper inspection procedure should include:
- Model verification
- Confirm the nameplate reads .
- Verify six RJ45 copper ports and two SC fiber interfaces.
- Record serial number and hardware markings.
- Physical inspection
- Inspect RJ45 sockets, SC optical interfaces, terminal block, DIN-rail clip, grounding point, and enclosure.
- Check for damaged optical connectors or contamination.
- DC power test
- Apply controlled DC power within the 9.6–60VDC operating range.
- Test each redundant power input independently where practical.
- Monitor startup current and alarm behavior.
- Copper Ethernet test
- Connect known-good 10/100BaseT(X) equipment.
- Verify auto-negotiation, link establishment, and bidirectional packet transmission.
- Fiber test
- Use compatible multimode fiber with SC connectors.
- Verify both 100BaseFX ports.
- Check optical link stability and packet transfer.
- Management test
- Verify console access.
- Confirm management functions such as VLAN configuration, port status, and SNMP where test equipment and firmware support them.
- Redundancy/alarm test
- Test the relay output where practical.
- Simulate loss of one DC input and verify continued operation from the remaining supply.
Moxa specifies 1 Mbit packet buffering, an 8K MAC address table, four priority queues, and 256 IGMP groups for the EDS-408A series.
Field Engineer’s Pitfall Guide
❗ Do Not Confuse MM-SC With SS-SC
The suffix tells you what fiber you are buying.
= 2 × 100BaseFX multimode SC
-SS-SC = 2 × 100BaseFX single-mode SC
They may look similar from the front, but they are not interchangeable optical configurations.
❗ Do Not Confuse the Standard and “-T” Versions
The standard is rated -10°C to +60°C.
The extends the specified operating range to -40°C to +75°C. If the equipment cabinet is installed outdoors, in an unheated enclosure, or beside high-temperature process equipment, this distinction matters.
❗ Remember: This Is Managed Ethernet
The is not simply an upgraded version of an unmanaged EDS-308 switch. It introduces Layer 2 management capabilities including VLAN, QoS, SNMP, RSTP/STP, and diagnostic functions. Existing network behavior can therefore depend on configuration—not just physical wiring.
Intent-Driven FAQ
MOXA a managed switch?
Yes. It is a Layer 2 managed industrial Ethernet switch. It supports management and network-control functions including VLAN, SNMP, QoS, STP/RSTP, port mirroring, and redundancy features.
How many ps the have?
It has 8 ports total: 6 × 10/100BaseT(X) RJ45 and 2 × 100BaseFX multimode SC.
What fs the use?
It uses 100BaseFX multimode fiber with SC connectors. Moxa lists a 4 km typical distance and approximately 1300 nm typical wavelength for the multimode interface.
s the support VLAN?
Yes. The series supports IEEE 802.1Q VLAN and port-based VLAN, with up to 64 VLANs specified for the switch.
e the on a 24VDC control panel?
Yes. The switch supports nominal 12/24/48VDC input and an operating range of 9.6–60VDC. It also provides redundant dual DC inputs.
s the suitable for a -40°C installation?
No, not the standard model.ndard is rated -10°C to +60°C. For -40°C to +75°C, select the version instead.
s the have a console port?
Yes. Moxa specifies an RS-232 console interface using a 10-pin connector, with the documented console parameters of 115200, 8 data bits, no parity, and 1 stop bit.
s the suitable as an EDS-308-MM-SC replacement?
Not as a blind drop-in replacement. Both models provide six copper ports and two multimode SC fiber ports, but the is a managed Layer 2 platform, while the EDS-308-MM-SC is an unmanaged switch. Network configuration and operational behavior therefore need to be checked before substitution.
