| Average time accuracy (demodulated IRIG-B and pulses) to UTC | ±100 ns | ±40 ns |
| Peak time accuracy (demodulated IRIG-B and pulses) to UTC | ±500 ns | ±100 ns |
| Holdover accuracy after 24 hours at a constant temperature | 6.9 ms TCXO | 315 µs with standard TCXO, 5 µs with OCXO option, and 2.5 µs with DOCXO option |
| Demodulated IRIG-B output ports | Up to 6 | Up to 9 |
| Demodulated IRIG-B BNC output voltage and cable length | 3.5 Vdc; up to 130 ft | 5.0 Vdc; up to 500 ft |
| Modulated IRIG-B port outputs | 1 | Up to 4 |
| Ethernet ports | 0 | 4 (can be copper, single-mode fiber, or multimode fiber and is ordered in pairs) |
| Network Time Protocol Version 4 (NTPv4) output support | No | Yes |
| NTP time-stamp accuracy (typical) to UTC output support | — | <100 µs |
| Precision Time Protocol (PTP) grandmaster (IEEE 1588) output support | No | Yes, with PTP option |
| PTP time-stamp accuracy (peak) to UTC | — | ±100 ns |
| PPS, kPPS output support | Yes | Yes |
| 10 MHz frequency output ports | No | 6 ports (optional) |
| ASCII outputs | Yes | No |
| Time display | Yes | Yes |
| Configurable cable delay compensation | No | Yes |
| Power supplies | 1 standard | 1 standard; 1 optional redundant, hot-swappable |
| Management interface | Serial | Web |
| Syslog | No | Yes |
| Role-based accounts and LDAP support | No | Yes |
| SNMP traps | No | Yes |
| Operating temperature | –40° to +80°C (–40° to +176°F) | –40° to +85°C (–40° to +185°F) |
| Time source | GPS | GPS; PTP (IEEE 1588-2008); and GLONASS (for verification only) |
| Recommended antenna | SEL-9524A | SEL-9524B |
| Antenna cable length | Up to 500 ft | Up to 500 ft |
| Satellite signal verification | No | Yes, with SEL-9524B GNSS antenna kit |
| IEC 60255, IEC 61000, and IEEE C37.90 | Yes | Yes |
| IRIG-B over fiber | Use optional fiber-optic serial port | Use SEL-2812 or SEL-3405 with DB-9 port |
| Alarm contact | Yes | Yes |