html{display:none} SEL-2488 Satellite-Synchronized Network Clock - Specifications | Schweitzer Engineering Laboratories


Time Accuracy
±40 ns average, ±100 ns peak for demodulated IRIG-B and 1 PPS (from BNC ports)
±1 μs modulated IRIG-B (peak) to UTC
<100 μs NTP time-stamp accuracy (typical) to UTC
±100 ns PTP time-stamp accuracy (peak) to UTC
Time Sources
GLONASS for verification
Holdover Accuracy After 24 Hours (Typical)
TCXO, 36 μs, constant temperature
TCXO, 315 μs, ±1°C
OCXO, 5 μs, constant & varied temperature
Ports1 front RJ45 Ethernet management port
8 rear BNC output ports
4 rear Ethernet ports in pairs of 10/100BASE-T, 100BASE-FX or 100BASE-LX10
1 rear DB-9 port
1 rear BNC IRIG-B input port (supported in future firmware revision)
Output Protocols
Up to 9 demodulated IRIG-B (B002, B004), PPS or kPPS
Up to 4 modulated IRIG-B (B122, B124)
NTPv4 server, broadcast, and multicast formats
Supported profiles with the PTP option (IEEE 1588-2008):
  • Default UDP (Annexes D and J)
  • Default IEEE 802.3 (Annexes F and J)
  • IEEE C37.238-2011 Power System
  • IEEE C37.238-2017 Power System
  • IEC/IEEE 61850-9-3:2016 Power Utility Automation
Network ResiliencyImplements as many as two PRP (IEC 62439-3:2016) or active-backup port bonded interfaces using the following physical Ethernet port combinations:
  • ETH 1 and ETH 2
  • ETH 3 and ETH 4
Supports PTP as a Doubly Attached Clock on ports where PRP is enabled.
Output Contact
Alarm contact, Form C
Timer contact, Form A, 1 μs accuracy
DisplayLED status indications
LCD screen with backlight
Power Supply
24–48 Vdc
125–250 Vdc or Vac
AntennaSEL-9524B GPS/GLONASS GNSS Antenna required for satellite signal verification
Operating Conditions–40° to +85°C (–40° to +185°F)