Time synchronization
Characteristic | Description |
---|---|
Time synchronization connectors |
External: SMA female coax connector (see MCX- and SMA-based inputs) and RJ45 10/100/1000BASE-T connector (see RJ45 10/100/1000BASE-T connector) Internal: MCX female coax connector (see MCX- and SMA-based inputs) |
Location |
Figure. Older version
Figure. Newer version
|
Input considerations
The time synchronization input interfaces of the NT SmartNICs are supplied with limited protection.
The time synchronization inputs on the NT SmartNICs do not fully support NT-PPS time synchronization output signals.
When a time synchronization input is configured for PPS signals, the rising edge is interpreted as on time.
MCX- and SMA-based inputs
This table specifies the time synchronization input interface for the MCX- and SMA-based inputs on the NT SmartNIC (the internal and external inputs, respectively).
Mode | Type | Parameter | Value |
---|---|---|---|
Power off/ Interface off | – | Termination | 100 kΩ DC |
Current in clamping circuit | 60 mA @ 5 V input Note: This only applies to external SMA-based inputs and not
to internal MCX-based inputs.
|
||
PPS mode | In | Termination | 50 Ω DC |
Rise/fall time | 0 – 30 ns | ||
Input levels | Rising edge, TTL levels | ||
Pulse width | 1 µs – 999 ms | ||
Current in clamping circuit | 130 mA @ 5 V input | ||
Out | Rise/fall | 0 – 10 ns | |
Output levels | Rising edge, TTL levels @ 50 Ω load | ||
Pulse width | 67 ms | ||
NT-TS mode Note: This only applies to internal MCX-based inputs and
not to external SMA-based inputs.
|
In | Termination | 50 Ω AC |
Rise/fall time | 0 – 30 ns | ||
Input levels | LVCMOS 2.5 V levels | ||
Pulse width | Proprietary NT protocol | ||
Current in clamping circuit | 130 mA @ 5 V input | ||
Out | Rise/fall | 0 – 10 ns | |
Output levels | LVCMOS 2.5 V levels | ||
Pulse width | Proprietary NT protocol |
RJ45 10/100/1000BASE-T connector
Supports precision time protocol (PTP) over Ethernet with data transfers of 10, 100 or 1000 Mbit/s.
Available time synchronization cables
For information on available time synchronization cables, see DN-0186 on docs.napatech.com (the Napatech Documentation Portal).