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TNM4000 Rackmount 28-Port Layer-2 Industrial Switch
TNM4000 Rackmount 28-Port Layer-2 Industrial Switch
TNM4000 Rackmount 28-Port Layer-2 Industrial Switch
TNM4000 Rackmount 28-Port Layer-2 Industrial Switch
TNM4000 Rackmount 28-Port Layer-2 Industrial Switch
TNM4000 Rackmount 28-Port Layer-2 Industrial Switch

TNM4000 Rackmount 28-Port Layer-2 Industrial Switch

Supports 20 Gigabit copper + 4 Gigabit/100M auto Combo (DIP) + 4 2.5G/1.0G/100M auto SFP slots

Management: WEB browser, CLI, MIB

Supports QoS (IEEE 802.1p/1Q and TOS/DiffServ)

Supports SNMPv1/v2c/v3

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Product Overview

The TNM4000 rack-mount 28-port Layer-2 industrial switch is a 1U rack-mount industrial switch with 20 Gigabit copper + 4 GE/FE auto-sensing Combo (DIP control) + 4×2.5G/1.0G/100M auto-sensing SFP, 1 CLI + 1 relay, fanless with built-in dual 100-240V industrial PSUs.

24-port DIN-rail unmanaged industrial switch: 24×10/100/1000BaseT, DIP audible/visual alarm and 1 relay alarm (1A@24VDC). Sheet-metal aluminum housing; IP40; operating temperature -40°C ~ +75°C. Redundant 12/24/48VDC (9.6~60VDC) & 24VAC (18~30VAC) input (Class 2 only). Tel: 86-21-58330762 Fax: 86-21-58330763

Certifications

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FAQ

  • The cable is connected, but the port will not come UP / the link is down. What should I check?

    +

    1) Confirm an industrial-grade cable and proper RJ45 crimping. 2) Check speed/duplex settings; set both ends to auto-negotiation. 3) Check whether the port is administratively shut down, in the wrong VLAN, or restricted by port security.

  • What are the PoE power specifications?

    +

    Standard PoE and PoE+ are supported, with max per-port power of 15.4 W and 30 W respectively. Total system power budget must be calculated during selection to avoid insufficient supply when too many PDs are connected.

  • Which ring protocols are supported, and what is the self-healing time?

    +

    Mainstream industrial ring protocols such as ERPS (G.8032), RSTP/STP, MRP, and PRP are supported. ERPS typical self-healing is ≤50 ms; traditional RSTP is second-level. It is recommended to use one ring protocol consistently across the network.

  • How should I choose between Layer-2 and Layer-3 industrial switches?

    +

    Layer-2 switches: basic features such as VLAN, ring networks, and port mirroring; suited to access layers and same-subnet networking with strong cost performance. Layer-3 switches: add static routing, OSPF, DHCP relay, multicast, and other routing features—choose these when cross-subnet communication or core/aggregation networks are required.

  • Can non-OEM SFP optical modules work normally?

    +

    The device is compatible with generic IEEE 802.3 SFP modules. Non-OEM modules can usually be recognized, but some brands may have compatibility issues. OEM modules are recommended.

  • How do I restore factory settings if I forget the device login password?

    +

    1) Hardware reset: press and hold the RESET button for 5–10 seconds; the device reboots to factory defaults. 2) Software reset: use the vendor NMS to restore factory settings remotely. All custom configurations will be cleared after restore.

  • What are the power supply requirements for industrial switches?

    +

    DC models support 18–60 VDC or 9.6–60 VDC; AC models support 100–240 VAC, with dual redundant power inputs. Phoenix terminal wiring; reverse-polarity protection is built in so normal reverse connection will not damage the device.

  • What are the operating temperature range and protection rating of industrial switches?

    +

    All-metal aluminum alloy housing. Operating temperature is -40°C to +75°C; premium wide-temperature models reach -40°C to +85°C. Typical enclosure rating is IP40.

Features

Supports 20 Gigabit copper + 4 GE/FE auto-sensing Combo (DIP control) + 4×2.5G/1.0G/100M auto-sensing SFP slots

Supports multiple management methods: WEB Browser , CLI , MIB

Provides packet-loss protection and fast recovery from network faults

Supports multiple multicast protocols with strong security

Supports IGMP snooping and GMRP

Supports QoS (IEEE 802.1p/1Q and TOS/DiffServ)

Supports SNMPv1/v2c/v3

Supports bandwidth management

Supportsport mirroring

Redundant dual power input design

Fanless , -40℃ ~ +85℃operating temperature

Specifications

IEEE 802.3 CSMA/CD method and physical Layer specifications CSMA/CD method and physical layer specifications

IEEE 802.1p Priority Queuing Priority Queuing

EEE 802.1q VLAN tagging VLAN Tagging

IEEE 802.1d Spanning Tree Algorithm Spanning Tree Protocol

IEEE 802.1w Rapid Spanning Tree Rapid Spanning Tree Protocol

IEEE 802.1s Multiple Spanning Tree Multiple Spanning Tree Protocol

IEEE 802.1x Authentication Authentication

IEEE 802.3 Etheret Ethernet

IEEE 802.3ac VLAN Tagging VLAN Tagging

IEEE 802.3ad Link Aggregation Link Aggregation

IEEE 802.3x Flow Control Flow Control

IEEE 802.3u Fast Etheret Fast Ethernet

IEEE 802.3z Gigabit Ethernet Gigabit Ethernet

IEEE 802 Networks Networks

RFC 768 UDP User Datagram Protocol

RFC 791 IP Internet Protocol

RFC 792 ICMP Internet Control Message Protocol

RFC 793 TCP Transmission Control Protocol

RFC 826 ARP Address Resolution Protocol

REC 854 Telnet CLIENT & Server Telnet Client & Server

RFC 862 Echo Protocol Echo Protocol

RFC 863 Discard Protocol Discard Protocol

RFC 1027 Using ARP to l mplement Transparent Subnet Gateways Proxy ARP

RFC 1059.1119 NTPV1/2 Network Time Protocol v1 and v2

RFC 1112 IGMP Host Extensions for IP Multicasting

RFC 1191 Path MTU Discovery Path MTU Discovery

The PAT4000 series fully domestic 28-port rack-mount Layer-2 industrial switch supports IGMP snooping, IEEE 802.1Q VLAN, port-based VLAN, QoS and port mirroring, plus Ethernet redundancy (RSTP/STP/MSTP) to improve reliability and backbone availability. It features a rugged aluminum alloy housing for industrial environments with optional fiber connectivity.

RFC 1851 The ESP Triple DES Transform ESP Triple DES Transform

RFC 1866 HTML HTML

REC 1994 PPP Challenge Handshake Authentication Protocol(CHAP)Challenge Handshake Authentication Protocol

RFC 2068 HTTP Hypertext Transfer Protocol

RFC 213 DHCP Server DHCP Server

RFC 2138 RADIUS Remote Authentication Dial-In User Service

RFC 2139 RADIUS Accounting RADIUS Accounting

RFC 2236 IGMPV2 IGMPv2

RFC 2474 DiffServ Precedence

RFC 2597 DiffServ Assured Forwarding

RFC 2598 DiffServ Expedited Forwarding

RFC 2644 Directed Broadcasts Directed Broadcasts

RFC 2865 Remote Authentication Dial in User Service (RADIUS)Remote Authentication Dial-In User Service

RFC 3046 DHCP Relay Agent Information Option DHCP Relay Agent Information Option

RFC 3222 Forwarding Information Base (FIB)Forwarding Information Base

GMRP GARP Multicast Registration Protocol

GVRP GARP VLAN Registration Protocol

SSH2 Secure Shell 2

GMP snooping IGMP snooping

SNMPv3 Simple Network Management Protocol v3

  • Switching Performance -

    Backplane bandwidth68Gbps
    Switching technologystore-and-forward
    MAC address table16K
    Packet buffer size4 Mbits
    Switching rate148,800 pps/FE port; 1,488,000 pps/GE port

  • Software Features -

    Management MethodsBrowser , Serial , STD-17 MIB-Il , STD-58 SMIv2 , STD-62 SNMPv3 , SNMPv2c, SNMPv1 , RFC 3636 MAU , RFC 2925 Ping MIB , MRD Private MI Bs
    DiagnosticsLEDs, log files, relay, port mirroring, TRAP
    RedundancySTP , MSTP , RSTP , link aggregation , MRP , ERPS
    time synchronizationNTP ，PTPv2
    Other4K VLANS , IPv4/IPv6 multicast , storm control , Supports Jumbo Frame

  • Power Parameters +

    Power connection1 removable 5-PIN terminal block
    Input voltage100-240VAC (50~60Hz)&100-240VDC , dual input
    overload current protectionSupports
    reverse polarity protectionSupports
    Power consumption≤20W

  • Physical Characteristics +

    Mounting methodrack mounting
    housingaluminum alloy housing
    protection ratingIP40
    Dimensions (W×H×D)442mm x 43.8mm x 335mm
    Weight≤2.65 kg
    Temperature Characteristics
    storage temperature-40°C ~ +85°C
    Operating temperature-40°C ~ +85°C
    Humidity5% ~ 95% (non-condensing)

  • Mechanical Characteristics +

    VibrationIEC 60068-2-6
    ShockIEC 60068-2-27
    free fallIEC 60068-2-31
    PCBCompliant with IPC standards

  • Electromagnetic Characteristics +

    EMI radiationFCC 47 CFR Part 15 Class A
    EN55032 Class A
    EN55035 Class A
    EMCIEC(EN)61000-4-2, Level 4
    IEC(EN)61000-4-4, Level 4
    IEC(EN)61000-4-5, Level 4
    IEC(EN)61000-4-6, Level 3
    IEC(EN)61000-4-8, Level 5
    IEC(EN)61000-4-12, Level 3

  • Industry Certification & Testing +

    Product SafetyCE.CB.IEC.IECEE
    IEC/EN 62368-1
    FCC Part 15 Subpart B C lass A
    hazardous areaUL/cUL1604 Class 1 Div2 (certification in progress)
    transportation industryJT/T817-2011 ; NEMA-TS2 (certification in progress)
    rail industryEN50121-4
    power industryIEC61850-3
    IEEE1613（C37.90.x）
    industrial control industryUL/cUL61010 (certification in progress)
    shipbuilding industryGL (certification in progress)

Dimensions

Dimensions

Accessories

ModelProduct Specification
TNM4000-ISB28HH4M4G24TThe Patriot PAT series homegrown controllable dual-100% power industrial switch is an industrial Ethernet switch independently developed by MRD (Shanghai Boying Communication Technology Co., Ltd.) on domestic CPU, switch chip, PHY, OS and software, delivering security and controllability from PHY to core software. Localization reaches dual 100% (100% domestic component types excl. Taiwan, and 100% domestic component quantity excl. Taiwan).

Hotline: 86-21-58330762

Zip: 201203

Email: sales@mrdcom.net

Address: No.123 Curie Road, China (Shanghai) Pilot Free Trade Zone

Copyright 2026 MRD Co LTD . All Rights Reserved Shanghai ICP No.12035199

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