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.
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.
MCX-based
inputs
This table specifies the time synchronization input interface for the
MCX-based inputs on the NT SmartNIC (the internal inputs).
Mode
Type
Parameter
Value
Power off/ Interface off
–
Termination
100 kΩ DC
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
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
Tyco Industrial Mini connector
Supports precision time protocol (PTP) over Ethernet with data transfers of 10 or 100
Mbit/s.
Supported input and output:
PPS/TTL level in 50 Ω
NT-TS
Available time synchronization cables
For information on available time synchronization cables, see DN-0186
on
docs.napatech.com (the Napatech Documentation Portal).
Style Conventions
Bold typeface is used for names of, for instance, user interface elements and software components.
Italic typeface is used for replaceable text.
Monospaced typeface is used for code, commands and file names.
Abbreviations
ATX
Advanced Technology eXtended
Aux.
AUXiliary
CAN
CANadian
CB
Certification Body
CBN
Common Bonding Network
CE
Conformité Européenne
CFP4
100 Gigabit Small Form-factor Pluggable
CSA
Canadian Standards Association
cURus
UL Recognized component mark for Canada and the United States
DDR3
Double Data Rate version 3
DDR4
Double Data Rate version 4
DN
Document Number
EMC
ElectroMagnetic Compatibility
ESD
ElectroStatic Discharge
EU
European Union
FCC
Federal Communications Commission
FDX
Full DupleX
FPGA
Field-Programmable Gate Array
Gen
GENeration
GND
GrouND
HW
HardWare
ICES
Interference-Causing Equipment Standard
IEEE
The Institute of Electrical and Electronics Engineers
ITE
Information Technology Equipment
LED
Light Emitting Diode
max
MAXimum
MCX
Micro CoaXial
MPO
Multiple-fiber Push On
MSI
Message Signaled Interrupts
MTBF
Mean Time Between Failures
NEBS
Network Equipment-Building System
NMB
Norme sur le Matériel Brouilleur
No.
Number
NT
NapaTech
OEM
Original Equipment Manufacturer
PBA
Printed Board Assembly
PCI
Peripheral Component Interconnect
PCIe
Peripheral Component Interconnect Express
PCI-SIG
Peripheral Component Interconnect – Special Interest Group
PMA
Pluggable Module Adapter
PPS
Pulse Per Second
PSM4
Parallel Single Mode 4
PTP
Precision Time Protocol
QSFP+
Quad Small Form-factor Pluggable Plus
QSFP28
Quad Small Form-factor Pluggable 4×28 Gbit/s
RAM
Random-Access Memory
RCM
Regulatory Compliance Mark (replaces C-Tick). Certifies that the product meets
electrical safety, electromagnetic compatibility (EMC), electromagnetic energy (EME) and
telecommunications standards set by the Australian Communications and Media Authority.
REACH
Registration, Evaluation, Authorization and restriction of CHemicals