Calnex Sentry Data Center Synchronization Monitor
Rack-mounted synchronization monitor for continuous measurement of up to 34 PTP/NTP streams and up to 5 clock signals.
- Measurement channels
- Maximum of two channels
- Connectors
- RJ45 for 100/1000 Base-T, SFP/SFP+ for 100M/1G/10G Optical, QSFP28 for 100G Optical, SFP28 for 25G Optical
- PTP/NTP TE measurement accuracy
- ±75 ns
- Packet rate
- 128 packets/sec if only two Main Channels are used decreasing to 1 packet/sec if two Main and 32 Virtual Channels are active
Overview
The Calnex Sentry is a data center synchronization monitor that provides independent, continuous verification that network synchronization accuracy is maintained. It monitors multiple PTP, 1PPS and NTP signals simultaneously at rates up to 100GbE.
Sentry measures one PTP or NTP stream on each of up to two physical Ethernet channels, with analysis on the web-based GUI, and with Option 621 measures 2wayTE on up to 32 additional virtual streams. Time error data is available over an API for integration into network management systems, or can be downloaded to the Calnex Analysis Tool.
An internal Rubidium oscillator disciplined by GNSS or 1PPS maintains measurements in holdover if the reference is lost. A hardware watchdog restarts the instrument under fault conditions, and redundant hot-swappable power supplies allow one power circuit to be de-energized without interrupting monitoring.
Key Features
- Calnex Analysis Tool (CAT) for evaluating Time Error, MTIE and TDEV against ITU-T masks
- PTP Field Verifier (PFV) analysis of PTP protocol conformance to standards-based or user-defined profiles
- Monitors up to 34 PTP or NTP streams
- Monitors up to 5 clock signals such as 1PPS
- Ethernet interfaces up to 100GbE
- Control and data download via web-based GUI or API
- Internal Rubidium oscillator disciplined to GNSS or 1PPS with holdover
- Hardware watchdog with automatic restart
- Redundant hot-swappable power supplies
Specifications
| Measurement channels |
Maximum of two channels
Only one line rate per channel active for a measurement
|
|---|---|
| Connectors |
RJ45 for 100/1000 Base-T, SFP/SFP+ for 100M/1G/10G Optical, QSFP28 for 100G Optical, SFP28 for 25G Optical
QSFP28 to SFP28 adapter supplied with 25G option; optical transceivers not supplied
|
| PTP/NTP TE measurement accuracy |
±75 ns
Constant TE measurement accuracy with reference to GNSS
|
| Packet rate | 128 packets/sec if only two Main Channels are used decreasing to 1 packet/sec if two Main and 32 Virtual Channels are active |
| User-defined clock types |
From 0.5 Hz to 200 MHz in 0.5 Hz steps
Symmetrical, unipolar clock signals
|
|---|---|
| Measurement ports | 2 per module, BNC |
| Frequency measurement | TIE accuracy 1 ns |
| 1PPS TE measurement accuracy |
±75 ns
Constant TE measurement accuracy with reference to GNSS
|
| Relative Time Error |
rTE ≤ 5ns
Accuracy of phase difference between any two clock inputs
|
| Rb output frequency accuracy |
1 x 10-9
7 mins to warmup
|
|---|---|
| Rb ageing (1 year) | <5 x 10-10 |
| Built-in GNSS module | 12 channels, GPS L1, Galileo E1, GLONASS G1 and BeiDou B1 bands (not compatible with B1C) |
| GNSS time accuracy | ±15 ns at 1σ after 24 hours lock |
| LAN/management port |
RJ45, 10/100/1000 Base-T
HTTP, HTTPS, DHCP or fixed IP (IPv4 or IPv6), FTP, web-based GUI, WebDav; supports VLAN
|
|---|---|
| Data storage | Internal: Up to 32G; External: USB memory stick |
| Operating temperature | 0°C to 40°C |
| Power supplies |
100 to 240 Vac ± 10%, 50 to 60 Hz ± 3 Hz
Instrument power consumption <100 W; operates on one supply, both recommended
|
| Dimensions | 3U cabinet designed for 19” rack. Depth 17.3” (439 mm) |
|---|---|
| Weight | 8.4 kg (max.) |
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- Continuous data center synchronization monitoring
- Time-as-a-Service SLA verification
- MIFID II timing compliance evidence for financial trading venues
- Detection of rogue time sources
Included
- Calnex Analysis Tool (CAT)
- PTP Field Verifier Tool (PFV)
- User manual on USB
- Line power cord
- 1-year warranty and support
Options & Accessories
| Option | Description |
|---|---|
| Option 610 | Clock module 1PPS/E1/T1 — Any clock from 0.5 Hz up to 200 MHz with 0.5 Hz step (maximum two per instrument) |
| Option 615 | 100M/1G packet port (PTP/NTP) |
| Option 616 | 100M/1G/10G packet port (PTP/NTP) |
| Option 618 | 100G Interface |
| Option 622 | 25G Interface |
| Option 620 | PTP and NTP PDV measurement software — One license per instrument |
| Option 621 | 32 additional virtual NTP/PTP measurements |
| Option 812 | One year extension of product warranty |
| Option 813 | Two years extension of product warranty |