SEL-2488 Satellite-Synchronized Network Clock Advanced Time Synchronization Major Features and Benefits The SEL-2488 Satellite-Synchronized Network Clock receives Global Navigation Satellite System (GNSS) time signals and distributes precise time via multiple output protocols, including IRIG-B and Network Time Protocol (NTP). The advanced capabilities of the SEL-2488 make it well suited for critical infrastructure applications, such as synchrophasors and event recording, as well as for larger substations with multiple timesynchronization requirements. ➤ Precise Time Accuracy Meets Demanding Requirements. Outputs demodulated IRIG-B time with ±40 ns average accuracy, ±100 ns peak accuracy, to UTC to enable sub-microsecond time synchronization for synchrophasor applications and IEC 61850-9-2 Sampled Measured Values. ➤ Holdover Oscillator Maintains Accuracy if GPS is Unavailable. Maintains average accuracy of 36 µs for 24 hours at constant temperature with standard Temperature Compensated Crystal Oscillator (TCXO) holdover. With optional Oven Controlled Crystal Oscillator (OCXO) holdover, average accuracy improves to 5 µs for 24 hours at constant or varied temperature. ➤ Thirteen Standard Outputs Provide Flexible Time Distribution. Distributes time from eight BNC outputs that can be configured to output demodulated IRIG-B, PPS or kPPS. As many as four of the BNC ports can be configured for modulated IRIG-B. There is also a DB-9 port for IRIG-B or pulse output. The SEL-2488 also includes four standard Ethernet ports. These ports, which provide NTPv4, can be ordered in pairs and are available in copper, single-mode fiber, or multimode fiber. ➤ Dual Power Supplies Offer Redundancy. Provides an option for a second power supply that can receive power from a second source. SEL-9330A power supplies support 125–250 Vdc or Vac input, and SEL-9330C power supplies use 24–48 Vdc. ➤ Satellite Signal Verification Provides Assurance. Receives signals from both GPS and GLONASS satellite systems for verification to provide a level of protection from GPS spoofing attacks. ➤ DHCP, LDAP, and Syslog Support Ensure Easy and Secure Integration. Makes commissioning faster and more secure with DHCP captive portal, LDAP authentication, and Syslog event messaging. ➤ Ruggedness Provides Reliability in Harsh Environments. Operates reliably between –40° and +85°C (–40° to +185°F), and complies with IEEE 1613, IEC 61850-3, and IEC 60255 standards. ➤ Easy-to-Use Interface Streamlines Device Management. The intuitive SEL-2488 HTTPS device webpage with SkyView™ simplifies configuration, management, and troubleshooting. Schweitzer Engineering Laboratories, Inc.

Functional Overview Status and Port Activity LEDs Time Status LEDs Multi-Information LCD Display Eight Configurable BNC Time Outputs (demodulated IRIG-B, pulse per second [PPS], kPPS, and modulated IRIG-B) Alarm and Configurable Timing Contact Outputs Local Management Port Four Standard Ethernet Ports DB-9 for IRIG-B or Pulse Output IRIG-B Input (future) Standard Power Supply Optional Redundant Power Supply Functional Diagram The SEL-2488 Satellite-Synchronized Network Clock receives GNSS time signals and distributes precise time via multiple output protocols, including IRIG-B and NTP. The SEL-2488...

server with typical client synchronization accuracy to the SEL-2488 NTP server on a LAN of 0.5–2 ms. With Syslog support, all SEL-2488 event information, including diagnostic and status events, is available over Ethernet in a standardized format. The SEL-2488 Ethernet Ports support hardware time stamping, enabling future support of the Precision Time Protocol, PTP, defined by IEEE 1588, with purchase of a future firmware upgrade. attack, in which a satellite system receiver locks to a counterfeit signal, the SEL-2488 Satellite-Synchronized Network Clock and 915900378 Dual-Constellation GPS Antenna...

HTTPS Device Webpage ) Enabled «PWRA *jTime Quality ^ Antenna #NTP Satellite Status Longitude -Rl.ttliW Used Visible Time Input AvailableSourceB Time Quality Time Zone Offset: -08:00 Daylighrr Saving Status: Off Time Output Device Information Format Time Reference Firmware Version: GNSS Receiver A Firmware Version: GNSS Receiver B Firmware Version: Part Number: Serial Number: Schweitzer Engineering Laboratories. Inc. (509)332-1 System Statistics Active Sessions): System Uptime: Power Cycles: Total Runtime: GNSS RecewerA: Holdover Clock: Clock Battery: Figure 5 SEL-24SS Dashboard With SkyView1...

Guideform Specification The SEL-2488 Satellite-Synchronized Network Clock shall meet the following specifications: ➤ Satellite Signals for Time Input. With an SEL ➤ Cable Delay Compensation. The product shall 915900378 Dual-Constellation GPS Antenna Kit allow cable delay compensation for the antenna the device shall receive signals from GPS and cable and for time outputs on a per port basis. GLONASS, and use GLONASS information to ➤ Graphical User Interface (GUI)-Based Secure verify the GPS signals. Management. The device shall provide a secure HTTPS GUI-based management interface. ➤ Accuracy,...

Front- and Rear-Panel Diagrams SEL-2488 SATELLITE SYNCHRONIZED NETWORK CLOCK Figure 7 SEL-2488 Front and Rear Panels RACK-MOUNT CHASSIS Schweitzer Engineering Laboratories, Inc.

Specifications Communications Ports Receiver Satellite Tracking: Acquisition Times Warm Start: Cold Start: GPS L1, C/A Code (1575.42 MHz), GLONASS L1 (1602 MHz), track up to 16 satellites for each constellation 240 s (With saved almanac data) 240 s + UTC compensation time (up to 12.5 min) Clock Accuracy (to UTC Time) 1 PPS: Demodulated IRIG-B: Modulated IRIG-B: NTP Time-Stamp Accuracy (Typical): ±40 ns average, ±100 ns peak ±40 ns average, ±100 ns peak ±1 µs peak <100 µs Typical client synchronization accuracy to the SEL-2488 NTP server on a LAN is 0.5–2 ms. Actual accuracy depends on network...