SEL-2488

Time Distribution—Configure the SEL-2488 clock’s eight BNC ports for demodulated IRIG-B, time pulse, or modulated IRIG-B (at up to four ports). IRIG-B provides time output for protection applications, synchronizing relays, phasor measurement units, and other IEDs to within ±40 ns. You can also add six SMA ports that output 10 MHz frequency via sine and square waves. Four Ethernet ports distribute time using NTP to devices on the substation LAN, such as servers, computers, and other devices that set their time through NTP or the Simple Network Time Protocol (SNTP). With the PTP option, the SEL-2488 can act as a PTP grandmaster clock, supporting the default (Annex J), power system (IEEE C37.238-2011/2017), and power utility automation (IEC/IEEE 61850-9-3:2016) profiles. The SEL-2488 can serve NTP or PTP to four independent Ethernet networks. 

Network Resiliency—The SEL-2488 supports as many as two Doubly Attached Node implementing PRP (DANP) interfaces for separate PRP networks or two active-backup port bonded interfaces for Ethernet failover. When PRP is enabled, all network traffic through the PRP interface will be duplicated across the two redundant LANs that form the PRP network. The SEL-2488 implements PTP as a Doubly Attached Clock on ports where PRP is enabled. Active-backup port bonding logically combines two physical Ethernet ports into a single network interface with only one port active while the other serves as a failover backup.

Cable Delay Compensation—Provide time delay compensation for antenna cables and output cables on a per-port basis to preserve accuracy. The SEL-2488 clock’s cable delay compensation ensures high-accuracy time distribution in large facilities with dispersed IEDs or in installations where antennas must be mounted high on towers.

Event Notification—Log and forward event messages across an Ethernet network using standard syslog event messaging. The SEL-2488 can store up to 60,000 syslog messages locally and send messages to three remote syslog destinations. It can also provide event notification through Simple Network Management Protocol (SNMP) traps and the alarm contact.

Dependable—Ensure uninterrupted power with an optional redundant, hot-swappable power supply. The SEL-2488 is engineered to operate reliably for years in extreme temperatures, from –40° to +85°C (–40° to +185°F). It is also certified to IEEE 1613 Class 2, IEC 61850-3, and IEC 60255 and is backed by the SEL ten-year worldwide product warranty.

Simple Authentication—Authenticate and authorize users with role-based user accounts and the Lightweight Directory Access Protocol (LDAP), increasing security and simplifying management efforts.

GNSS Vulnerability Mitigation—Maintain accurate time in the event of GNSS disruptions, such as antenna failures, jamming, or solar flares, with a seamless transition to an internal holdover time source. In the case of a GPS spoofing attack, in which a satellite system receiver locks to a counterfeit signal, the SEL-2488 and SEL-9524B GPS/GLONASS precise-time antenna use signals from the GLONASS satellite constellation to validate GPS signals and identify the mismatched timing information that this type of attack causes. 

High-Stability Holdover—Sustain extremely accurate time in holdover with the high-stability internal oscillator. The internal oscillator provides timing accuracy to 315 µs, 5 µs, or 2.5 µs after 24 hours with the respective TCXO, OCXO, or DOCXO options.

Easy and Secure Commissioning—Easily configure the SEL-2488 with an HTTPS web interface via the front Ethernet management port, which provides a graphical SkyView display for troubleshooting signal or antenna issues. The port is enabled by default and can be disabled if desired.

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Timekeeping Compliance for Public Service Answering Points (PSAPs)— Reliably synchronize equipment for emergency dispatch, such as 911 call handling equipment (CHE), dispatch consoles, and wall clocks, using NTP, IRIG-B, and 1 PPS outputs. Maintain compliance with Criminal Justice Information Services (CJIS) timekeeping requirements for call recording equipment (CRE).

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Land Mobile Radio (LMR) Time Synchronization— Maintain continuous high-quality audio in the field by reliably synchronizing LMR systems with 10 MHz and 1 PPS outputs. The SEL-2488 is interoperable with most radio systems, including Project 25 (P25), Digital Mobile Radio (DMR), and Terrestrial Trunked Radio (TETRA), used for 911 emergency response, utility field dispatch operations, and other applications.