Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A4H254-8F8T |
| Port Layout | 8 × 100Base-FX MT-RJ; 8 × 10/100Base-TX RJ45; 2 × 10/100/1000Base-T stacking/uplink; 2 × Gigabit SFP slots |
| Switching Capacity | 17.6 Gbps |
| Forwarding Rate | Wire-speed non-blocking |
| Power Input | 100–240 VAC, 50/60 Hz; supports external redundant power supply |
| Mounting | 19-inch rack mount |
| Operating Temperature | 0°C to +50°C |
| Storage Temperature | -40°C to +70°C |
| Relative Humidity | 5%–95%, non-condensing |
| Supported Protocols | VLAN, static routing, RIPv1/v2, ACL, QoS, SNMP |
| HS Code | 8517620000 |
Product Introduction (Anti-Template)
When a main CPU trips and downtime costs thousands per minute, reliable network segmentation between field sensors and the control room becomes non-negotiable. The A4H254-8F8T blends fiber and copper ports in one compact rack unit, so you can extend long-distance fiber links to remote field I/O while keeping local copper connections for nearby panels. Honestly, this mixed-media port layout cuts down on extra media converters in brownfield plant retrofits.
A4H254-8F8T
A4H254-8F8T
A4H254-8F8T
A4H254-8F8T
A4H254-8F8T
QC, Procurement & Logistics SOP
- Inbound Verification: Origin trace review and OEM front panel marking validation. Visual inspection for bent port pins, cracked case or prior water damage.
- Live Rig Testing: Full power-on boot sequence, port link validation for FX fiber and TX copper, SFP uplink handshake, stacking protocol test and configuration backup. Full test report packaged with each unit.
- QA & Anti-Static Packaging: Unit cleaned and inspected, static shielding bag, rigid foam lined carton with shock padding for transit.
- Global Logistics & Export Compliance: Apply optimized HS code classification to reduce customs hold risk. Secure packaging rated for air or sea freight; commercial invoice and certificate of origin prepared for customs databases.
Technical Pitfalls & Integration Warnings
- Firmware Rev Mismatch. If your existing A4 stack runs firmware V6.54 and the replacement switch uses V6.61, stacking may drop sync or reject VLAN configuration. One power plant technician added an untested unit and spent 11 hours fixing stack partition errors.
- DIP Switch / Configuration errors. Incorrect stacking port mode selection will block stack formation. A refinery team set uplink mode instead of stack mode and could not manage all switches from one console.
- Wiring/Terminal incompatibility. The 100Base-FX ports use MT-RJ connectors; LC fiber cables will not plug in without adapters. A factory tried direct LC cable connection and saw zero link light on the fiber ports.
- ESD destruction during unboxing. The onboard PHY chips are sensitive. A technician touching exposed port circuitry without a grounded wrist strap can create latent faults that surface under cabinet temperature swings.
Frequently Asked Questions (FAQ)
Q: What lead times apply for international shipments? A: Stocked units ship within 1–3 business days. Air freight transit runs 3–7 days; sea freight takes 25–45 days, though customs clearance in Southeast Asia might add 2 days. Q: What export documentation can you provide? A: We prepare commercial invoice, packing list and certificate of origin for customs filing. All documentation matches the declared HS classification. Q: Can I hot-swap this switch into an active A4 stack? A: Hot insertion is not recommended. Adding or removing the unit while the stack runs can trigger stack reboots and interrupt DCS network traffic. Q: Will this switch work with other A-series models in the same stack? A: Yes, it can stack with other A4 family switches, but all stack members should run matching major firmware revisions to avoid instability. Q: What is covered under the standard warranty? A: Warranty runs 12 months from shipment date, covering factory-verified hardware defects. Damage from ESD, miswiring or firmware misconfiguration falls outside coverage. Q: Can I use both SFP gigabit ports and the RJ45 stacking ports at the same time? A: Yes, you can use them concurrently, but stacking and uplink bandwidth must be planned to avoid congestion on control network traffic. Q: Does this unit ship with SFP transceivers included? A: No. SFP modules are sold separately; you must match fiber type and distance for your site’s cabling plant.
