Time synchronization
| Characteristic | Description |
|---|---|
| Time synchronization connectors |
External: SMA female coax connector (see SMA female coax connector protocols) |
| Location |
|
Input considerations
The time synchronization input interfaces of the NT SmartNICs are supplied with limited protection.
Warning: Connecting incompatible signal sources to NT time synchronization input
interfaces might damage the NT SmartNIC hardware.
When a time synchronization input is configured for PPS signals, the rising edge is interpreted as on time.
SMA female coax connector protocols
This table specifies the supported external SMA connector protocols.
| Protocol | SMA 1 | SMA 2 |
|---|---|---|
| 1PPS Output | Supported | Not supported |
| 1PPS Input | Supported | Supported |
| 10MPPS Output | Not Supported | Supported |
| 10MPPS Input | Not Supported | Supported |
MCX- and SMA-based I/O
This table specifies the time synchronization input interface for the MCX- and SMA-based inputs and outputs 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 |
Note: MCX connectors are not included in NT400D11-NEBS SmartNICs.
Available time synchronization cables
For information on available time synchronization cables, see DN-0186 on docs.napatech.com (the Napatech Documentation Portal).