PT-7728 Series

Features and Benefits

  •  IEC 61850-3, IEEE 1613 (power substations), and EN 50121-4 (railway applications) compliant
  • IEC 62439-3 Clause 4 (PRP) and Clause 5 (HSR) compliant
  • Built-in MMS server based on IEC 61850-90-4 switch data modeling for power SCADA
  • Complies with a portion of EN 50155 specifications
  • Turbo Ring and Turbo Chain (recovery time < 20 ms @ 250 switches), RSTP/STP, and MSTP for network redundancy
  • VLAN Unaware: Supports priority-tagged frames to be received by specific IEDs
  • Up to 12 ports with M12 connectors
  • Isolated redundant power inputs with universal 24 VDC, 48 VDC, or 110/220 VDC/VAC power supply range
  • -40 to 85°C operating temperature range


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The PT-7728 is designed to meet the demands of power substation automation systems (IEC 61850-3, IEEE 1613), and railway applications (EN 50121-4), and also features critical packet prioritization (GOOSE and SMVs) and a built-in MMS server. The PT-7728’s Gigabit and Fast Ethernet backbone, redundant ring, and 24 VDC, 48 VDC, or 110/220 VDC/VAC dual isolated redundant power supplies increase the reliability of your communications and save on cabling/wiring costs. The modular design of the PT-7728 also makes network planning easy, and allows greater flexibility by letting you install up to 4 Gigabit ports and 24 Fast Ethernet ports. Along with the optional front or rear wiring, these features together make the PT-7728 suitable for a variety of industrial applications.

Additional Features and Benefits

  • Switch data modeling based on the IEC 61850-90-4 standard

  • IEEE 1588v2 PTP (Precision Time Protocol) for time synchronization of networks (PTP models only)

  • VLAN Unaware: Supports priority-tagged frames to be received by specific IEDs

  • DHCP Option 82 for IP address assignment with different policies

  • EtherNet/IP and Modbus TCP industrial Ethernet protocols supported

  • Line-swap fast recovery

  • Configurable by web browser, Telnet/serial console, CLI, Windows utility, and ABC-01 automatic backup configurator

  • IGMP snooping and GMRP for filtering multicast traffic from industrial Ethernet protocols

  • Supports advanced VLAN capability with Q-in-Q tagging

  • IEEE 802.3ad, LACP for optimum bandwidth utilization

  • Bandwidth management to prevent unpredictable network status

  • Multi-port mirroring for online debugging

  • Automatic warning by exception through email and relay output

  • RMON for proactive and efficient network monitoring

  • Automatic recovery of connected device’s IP addresses

Cybersecurity Features

  • User passwords with multiple levels of security protect against unauthorized configuration

  • SSH/HTTPS is used to encrypt passwords and data

  • Lock switch ports with 802.1X port-based network access control so that only authorized clients can access the port

  • RADIUS/TACACS+ allows you to manage passwords from a central location

  • 802.1Q VLAN allows you to logically partition traffic transmitted between selected switch ports

  • Secure switch ports so that only specific devices and/or MAC addresses can access the ports

  • Disable one or more ports to block network traffic

  • SNMPv3 provides encrypted authentication and access security


Ethernet Interface
Cabling Direction PT-7728-F Series: Front cabling
PT-7728-R Series: Rear cabling
Compatible Modules Slot 1/2/3:
PM-7200-4TX-PTP (PT-7728-PTP only)
PM-7200-4MST-PTP (PT-7728-PTP only)
PM-7200-4MSC-PTP (PT-7728-PTP only)
Slot 4:
PM-7200-4GSFP-PHR-PTP (PT-7728-PTP only)
PM-7200-4GTX-PHR-PTP (PT-7728-PTP only)
PM-7200-1BNC2MST-PTP (PT-7728-PTP only)
Standards IEEE 802.1D-2004 for Spanning Tree Protocol
IEEE 802.1p for Class of Service
IEEE 802.1Q for VLAN Tagging
IEEE 802.1s for Multiple Spanning Tree Protocol
IEEE 802.1w for Rapid Spanning Tree Protocol
IEEE 802.1X for authentication
IEEE 802.3 for 10BaseT
IEEE 802.3ab for 1000BaseT(X)
IEEE 802.3ad for Port Trunk with LACP
IEEE 802.3u for 100BaseT(X) and 100BaseFX
IEEE 802.3x for flow control
IEEE 802.3z for 1000BaseSX/LX/LHX/ZX
Ethernet Software Features
Filter 802.1Q, GMRP, GVRP, IGMP v1/v2c, QinQ VLAN, VLAN unaware
Industrial Protocols EtherNet/IP, Modbus TCP
Management Back Pressure Flow Control, BOOTP, DHCP Option 66/67/82, DHCP Server/Client, Flow control, HTTP, IPv4/IPv6, LLDP, Port Mirror, RARP, RMON, SMTP, SNMP Inform, SNMPv1/v2c/v3, Syslog, Telnet, TFTP, Fiber check
MIB Bridge MIB, Ethernet-like MIB, MIB-II, P-BRIDGE MIB, Q-BRIDGE MIB, RMON MIB Groups 1, 2, 3, 9, RSTP MIB
Power Substation IEC 61850 QoS, MMS
Redundancy Protocols All models: Link Aggregation, MSTP, RSTP, STP, Turbo Chain, Turbo Ring v1/v2
PTP models: HSR, PRP
Security Broadcast storm protection, HTTPS/SSL, TACACS+, Port Lock, RADIUS, Rate Limit, SSH
Time Management All models (except PTP models): NTP Server/Client, SNTP
PTP models: NTP Server/Client, SNTP, IEEE 1588 PTP v1/v2 (hardware-based)
Switch Properties
IGMP Groups 256
Max. No. of VLANs 64
VLAN ID Range VID 1 to 4094
Priority Queues 4
Serial Interface
Console Port RS-232 (RJ45)
Input/Output Interface
Alarm Contact Channels Resistive load: 3 A @ 30 VDC, 240 VAC
Power Parameters
Input Voltage -24-24/-48-48/-HV-HV/-24-HV/-48-HV models: Redundant power modules
PT-7728-24 Series: 24 VDC (18 to 36 VDC)
PT-7728-48 Series: 48 VDC (36 to 72 VDC)
PT-7728-HV Series: 110/220 VAC/VDC (85 to 264 VAC, 88 to 300 VDC)
Overload Current Protection Supported
Reverse Polarity Protection Supported
Connection 10-pin terminal block
Input Current PT-7728-24 Series: 2.38 A @ 24 VDC
PT-7728-48 Series: 1.12 A @ 48 VDC
PT-7728-HV Series: 0.49/0.26 A @ 110/220 VAC, 0.59/0.30 A @ 110/220 VDC
Physical Characteristics
Housing Aluminum
IP Rating IP30
Dimensions (without ears) 440 x 44 x 325 mm (17.32 x 1.73 x 12.80 in)
Weight 5900 g (13.11 lb)
Installation 19-inch rack mounting
Environmental Limits
Operating Temperature -40 to 85°C (-40 to 185°F)
Note: Cold start requires minimum of 100 VAC @ -40°C
Storage Temperature (package included) -40 to 85°C (-40 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications
Safety UL 60950-1
EMI EN 55032 Class A, CISPR 32, FCC Part 15B Class A
EMS IEC 61000-4-2 ESD: Contact: 8 kV; Air: 15 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 35 V/m
IEC 61000-4-4 EFT: Power: 4 kV; Signal: 4 kV
IEC 61000-4-5 Surge: Power: 4 kV; Signal: 4 kV
IEC 61000-4-6 CS: 10 V
IEC 61000-4-8 PFMF
IEC 61000-4-11 DIPs
Power Substation IEC 61850-3, IEEE 1613
Railway EN 50121-4, EN 50155 (complies with a portion of EN 50155 specifications)
Traffic Control NEMA TS2
Time 393,828 hrs
Standards Telcordia SR332
Warranty Period 5 years
Details See