Switches, Hubs

Part Number	Description / PDF	Quantity
NS-105A ICP DAS USA Inc.	UNMANAGED 5-PORT INDUSTRIAL ETHE	30
NS-208PSE-4 ICP DAS USA Inc.	8 PORT INDUSTRIAL ETHERNET SWITC	30
NS-208PSE-R ICP DAS USA Inc.	NS-208PSE ROBUST VERSION WITH CO	30
NSM-208PSE ICP DAS USA Inc.	NS-208PSE WITH METAL CASE	30
NSM-216 ICP DAS USA Inc.	UNMANAGED 16-PORT INDUSTRIAL 10/	30
NS-205 ICP DAS USA Inc.	5-PORT ETHERNET SWITCH	25
NSM-208PSE-R ICP DAS USA Inc.	8 PORT INDUSTRIAL ETHERNET SWITC	30
NSM-205PSE-12V ICP DAS USA Inc.	12V UNMANAGED 5 PORT 10/100 MBPS	30
NSM-205PSE-24 ICP DAS USA Inc.	METAL CASE OF NS-205PSE-24	30
NS-208A ICP DAS USA Inc.	NS-208 WITH POWER INPUT +12 ~ 48	30
NSM-208G ICP DAS USA Inc.	1 GB INDUSTRIAL ETHERNET SWITCH	30
NS-205AG ICP DAS USA Inc.	NS-205 WITH 48 VDC INPUT	30
NS-205PSE-IP67 ICP DAS USA Inc.	NS-205PSE IN IP 67 CASE	30
RSM-408 ICP DAS USA Inc.	INDUSTRIAL ETHERENT REAL TIME RE	30
NSM-316G ICP DAS USA Inc.	16-PORT GBE ETHERNET UNMANAGED S	30
NS-208 ICP DAS USA Inc.	8-PORT ETHERNET SWITCH	25
NS-208R ICP DAS USA Inc.	NS-208 WITH CONFORMAL COATING, W	30
NS-205IP67/DIN ICP DAS USA Inc.	NS-205 IP 67 SWITCH WITH DIN RAI	30
RSM-405 ICP DAS USA Inc.	INDUSTRIAL ETHERENT REAL TIME RE	30
EDS-P208-TL ICP DAS USA Inc.	8-PORT POE SWITCH, 10/100M	25

Switches, Hubs

1. Overview

Network switches and hubs are fundamental components in wired networking infrastructure. While both devices connect multiple Ethernet devices, switches operate at Layer 2 (Data Link) of the OSI model with intelligent MAC address learning capabilities, while hubs function as basic Layer 1 (Physical) broadcast devices. Switches enable efficient point-to-point communication, reducing collisions compared to hubs. Their role in modern network architecture is critical for enterprise connectivity, data center operations, and industrial IoT deployments.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Managed Switches	Support VLANs, QoS, SNMP monitoring, and port configuration	Enterprise core networks
Unmanaged Switches	Plug-and-play operation with fixed configurations	Small office/home networks
PoE Switches	Deliver power over Ethernet cables (IEEE 802.3af/at/bt)	IP camera systems
Core Switches	High-throughput backbone connectivity with redundant hardware	Data center aggregation
Access Switches	Edge network connectivity with basic security features	Corporate workstations
Active Hubs	Signal amplification with multi-port repeater functionality	Legacy industrial control systems
Passive Hubs	Simple physical layer connections without signal regeneration	Temporary network troubleshooting

3. Structure and Components

Typical switch architecture includes:

Modular/rackmount chassis with pluggable SFP/SFP+ ports
Application-Specific Integrated Circuits (ASICs) for packet processing
Content-Addressable Memory (CAM) for MAC address tables
Power over Ethernet (PoE) midspan/injector circuitry
Embedded firmware with CLI/Web GUI management interfaces

Hubs feature simpler construction:

Basic printed circuit board with Ethernet transceivers
Passive backplane connecting all ports
LED indicators for link/activity status

4. Key Technical Specifications

Parameter	Description	Importance
Port Density	Number of 10/100/1000 Mbps or 10/25/40/100 GbE ports	Determines scalability
Switching Capacity	Backplane bandwidth (bps)	Maximum data throughput potential
MAC Address Table Size	Number of supported device entries	Affects network scale and performance
Latency	Store-and-forward delay ( s)	Critical for real-time applications
PoE Budget	Total power delivery capacity (W)	Limits connected device count
Redundancy Protocols	STP/RSTP/MSTP support	Network fault tolerance

5. Application Domains

Enterprise networks (Fortune 500 offices with 10k+ devices)
Industrial control systems (Manufacturing plant floor switches)
Data centers (40/100 GbE spine-leaf architectures)
Smart buildings (PoE-enabled lighting and HVAC control)
Educational institutions (Campus network access layer)

6. Leading Manufacturers

Vendor	Flagship Products
Cisco Systems	Catalyst 9500 Series, Nexus 9000
Huawei	CloudEngine 8800, S5735 Series
HPE	Aruba 6200M, 5400R zl2
Juniper Networks	EX4600, QFX5100 Series
Ubiquiti	UniFi Switch Pro, EdgeSwitch

7. Selection Guidelines

Assess network scale (Small business vs. enterprise campus)
Determine management needs (CLI access vs. SNMP monitoring)
Calculate PoE requirements (Device wattage and total consumption)
Evaluate future expansion (Modular vs. fixed configuration)
Consider security features (802.1X authentication, ACLs)
Budget planning (Capex vs. Opex optimization)

8. Industry Trends

Key developments shaping the future of network switching include:

Software-Defined Networking (SDN) integration for centralized control
Multi-gigabit Ethernet adoption (2.5/5/10 GbE for Wi-Fi 6/7 backhaul)
AI-powered network analytics for predictive maintenance
Open networking platforms (White-box switches with disaggregated OS)
Energy-efficient designs (IEEE 802.3az compliant devices)
Convergence of wired/wireless management interfaces