SEL SEL-2488 Satellite-Synchronized Network Clock
SEL-2488
Satellite-Synchronized Network Clock
Enhancements Coming SoonHoldover accuracy of 1 µs after 24 hours with an optional rubidium oscillator.
The SEL-2488 supports multiple time reference sources, including the Global Navigation Satellite System (GNSS) signals and the Precision Time Protocol (PTP), and distributes precise time via multiple timing outputs, including IRIG-B, the Network Time Protocol (NTP), the PTP, 10 MHz frequency, and 1 pulse per second (PPS).
With an optional upgrade, the SEL-2488 can serve as a PTP grandmaster clock, as defined by IEEE 1588-2008. It provides Parallel Redundancy Protocol (PRP) support as a Dual-Attached Node (DAN) device for PTP and NTP time distribution.
The advanced capabilities of the SEL-2488 make it well-suited for critical infrastructure networks like emergency communications systems, for substations with multiple time synchronization requirements, and for demanding power utility applications—like synchrophasors, Sampled Values, and traveling-wave fault locating.
Accurate
Precisely synchronize to within ±40 ns of UTC for critical applications. Cable delay compensation can be configured for antenna cables and output cables per port to preserve high accuracy.
If GNSS timekeeping is temporarily lost, the internal oscillator provides the following holdover accuracy, depending on the options chosen.
| Configuration | Oscillator | Holdover accuracy after 24 hours |
|---|---|---|
| Standard | TCXO | 315 μs |
| Optional | OCXO | 5 μs |
| Optional | DOCXO | 2.5 μs |
Powerful Time Distribution
Distribute time from eight BNC outputs and one DB-9 output, which are configurable for IRIG-B or time pulse outputs.
The DB-9 port can be used with SEL-2812 Fiber-Optic Transceivers With IRIG-B or SEL-3405 High-Accuracy IRIG-B Fiber-Optic Transceivers to send IRIG-B long distances over fiber-optic cable.
SEL-2488
The SEL-2488 also includes four standard Ethernet ports, which provide NTPv4. 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 distribute NTP and PTP to four independent networks or two separate PRP or Ethernet failover networks. Ethernet ports are orderable in pairs and are available in copper as well as single- or multimode fiber.
You can also configure the clock for radio communication systems with optional 10 MHz frequency outputs.Secure
Secure access to the SEL-2488 through X.509 certificates, user-based accounts, Lightweight Directory Access Protocol (LDAP) authentication, and complex passwords.
The SEL-2488 supports syslog, a standard for event record logging that integrates with existing log management systems.
With satellite signal verification, the SEL-2488, when installed with a dual-constellation antenna, uses signals from two satellite constellations to validate GNSS time signals, providing a layer of protection from spoofing attacks.
The SEL-2488 also includes a PTP AMT, ensuring synchronization only with trusted PTP timeTransmitters, contributing to a layered defense against cyber threats.Simple Configuration
Easily access and modify system configurations through an intuitive and secure HTTPS web interface.
Manually configure date and time settings for testing and continuity.
Simulate holdover and leap seconds to evaluate device and system behavior.
Eliminate the need to manually reset the time after a reboot by using the Continue Manual Date/Time on Startup feature.Enhanced Monitoring and Management
The SEL-2488 supports SNMP for centralized monitoring and management of network devices.
Easily perform advanced monitoring and diagnostics for time synchronization across distributed networks thanks to IEEE 1588e-2024 PTP MIB compliance for enhanced situational awareness and operational visibility.