Enterasys A4H254-8F8T

Product Name: Enterasys (Extreme Networks) A4H254-8F8T — Managed Hybrid Fiber/Copper Switch

Product Introduction:
The A4H254-8F8T is a 16-port managed switch from the Enterasys SecureStack A4H series. It provides 8 Gigabit SFP fiber ports and 8 Gigabit RJ-45 copper ports, making it ideal for environments requiring both fiber backbone connectivity and copper access connectivity in a single unit.

Category: Others

Description

Model Series: Enterasys SecureStack A4H Series

Technical Specifications:

Parameter	Value
Port Configuration	8 × 1000BASE-X SFP (fiber) + 8 × 10/100/1000BASE-T RJ-45 (copper)
Uplink Ports	2 × 10 Gigabit SFP+
Switching Capacity	88 Gbps
Forwarding Rate	65.5 Mpps
MAC Table	16,000 entries
VLANs	4,094 (802.1Q)
Jumbo Frame	9,216 bytes
PoE	Not supported on this model
Stacking	Up to 8 units
Management	CLI, SNMP v1/v2c/v3, Web, SSH v2, SSL
Power	Dual hot-swappable PSU, 65W max
Dimensions (W×H×D)	440 × 44 × 236 mm
Weight	3.6 kg
Operating Temp	0°C to +45°C

Functional Features:

Layer 2+ with static IPv4 routing
802.1X port authentication (fiber and copper ports)
RADIUS / TACACS+
Hardware ACL (L2–L4)
IGMP snooping v1/v2/v3
MSTP / RSTP / STP
LACP link aggregation (802.3ad)
QoS: 8 priority queues, DSCP, WRR/SP
Storm control
SPAN / RSPAN port mirroring
DHCP snooping, Dynamic ARP Inspection
IPv4 static routes (up to 64)
Syslog, NTP, SNMP v3

Performance Parameters:

Latency: 1.5 μs
Buffer: 8 MB shared
Copper Port Auto-Negotiation: 10/100/1000 Mbps, auto-MDI/MDIX

Structural Features:

1U rack-mountable
Front: 8 SFP cages + 8 RJ-45 ports with per-port LEDs
Rear: 2 × 10G SFP+, console (RJ-45), USB, dual PSU
Hot-swappable fan

Working Principle:
Hybrid switching — SFP ports handle optical traffic, RJ-45 ports handle copper traffic. Both are bridged internally by the ASIC switching fabric. The management CPU configures VLANs, ACLs, and QoS policies which are downloaded to hardware. 10G SFP+ ports serve as uplinks or stacking interconnects.

Advantages:

Hybrid fiber + copper in a single 1U switch — reduces rack space
10G SFP+ uplinks for high-speed aggregation
Full enterprise security suite
Stacking for unified management
Cost-effective alternative to separate fiber and copper switches

Applicable Industries:

Enterprise campus (building wiring closet)
SMB networks
Hospital departmental switches
School / university lab networks
Surveillance / IP camera networks (copper access + fiber uplink)

Installation Requirements:

1U rack space with proper ventilation
Cat5e/Cat6 cables for RJ-45 ports (max 100m)
SFP modules for fiber ports (single-mode or multi-mode)
Dual PSU on separate circuits
Ground chassis to building earth

Usage Precautions:

Do not exceed 100m cable length on copper ports
Use shielded cables in high-EMI environments
Enable spanning tree on all trunk ports
Set 802.1X on all access ports for security
Verify SFP module compatibility (Extreme Networks or 3rd-party compatible)

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