Other Data Fields

Network Interface Modules

Platform
Napatech SmartNIC
Content Type
User Guide

In this section

This section describes some other data fields from the example in Example of Real I2C NIM Data, which are both static and dynamic.

Temperature

The temperature field is an example of a dynamic field, which is constantly updated by the module firmware. This field is located at address 0xA02F as a 16-bit signed integer. The unit is 1/256 °C.

The bytes in the example are 0x19 and 0x37, and since the format is little endian, the least significant byte is found at the lowest address. So the two bytes represent the value 0x3719 (14105 in decimal notation). In decimal notation, the temperature is therefore 1/256 × 14105 °C = 55.098 °C. Thus the first of the two bytes represents the fraction part of the value, and the second byte represents the integer part.

Bias current

Measured laser bias current for up to 16 lanes is located at address 0xA2A0 as a 16-bit unsigned integer for each lane. The unit is 2 μA.

The bytes in the example are 0x24, 0x7B, 0xCD, 0x77, 0xC1, 0x78, 0xB5 and 0x79 for 4 lanes. The bytes for the first lane represent the value 0x7B24 (31524 in decimal notation). In decimal notation, the bias current for the first lane is therefore 2 × 31524 μA = 63.048 mA.

TX output power

Measured TX output power for up to 16 lanes is located at address 0xA2B0 as a 16-bit unsigned integer for each lane. The unit is 0.1 μW.

The bytes in the example are 0xF2, 0x4D, 0x81, 0x38, 0x1B, 0x4A, 0x46 and 0x49 for 4 lanes. The bytes for the first lane represent the value 0x4DF2 (19954 in decimal notation). In decimal notation, the TX output power for the first lane is therefore 0.1 × 19954 μW = 1.9954 mW.

RX input power

Measured RX input power for up to 16 lanes is located at address 0xA2D0 as a 16-bit unsigned integer for each lane. The unit is 0.1 μW.

The bytes in the example are 0xB4, 0x36, 0xB0, 0x2E, 0x12, 0x36, 0xBE and 0x41 for 4 lanes. The bytes for the first lane represent the value 0x36B4 (14004 in decimal notation). In decimal notation, the RX input power for the first lane is therefore 0.1 × 14004 μW = 1.4004 mW.

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

API

Application Programming Interface

CFP

100 Gigabit Form-factor Pluggable

CFP4

100 Gigabit Small Form-factor Pluggable

DDM

Digital Diagnostics Monitoring

DN

Document Number

Fec, FEC

Forward Error Correction

HW

HardWare

I2C

Inter-IC (two-wire interface)

IC

Integrated Circuit

ID

IDentifier

INF

INFormation

LR

Long range

MDIO

Management Data Input/Output

MIS

Management Interface Specification

MSA

Multi-Source Agreement

NIM

Network Interface Module

NT

NapaTech

PHY

PHYsical layer device

PMA

Pluggable Module Adapter

PTP

Precision Time Protocol

QSFP+

Quad Small Form-factor Pluggable Plus

QSFP28

Quad Small Form-factor Pluggable 4×28 Gbit/s

Rev.

REVision

RX

Reception/Receive

SFF

Small Form Factor

SFP

Small Form-factor Pluggable

SFP+

Enhanced Small Form-factor Pluggable

SFP28

Small Form-factor Pluggable 28 Gbit/s

Spec

SPECification

SR

Short range

STD

STanDard

TX

Transmission/Transmit

References

INF-8074i

SFF Committee, Specification for SFP (Small Formfactor Pluggable) Transceiver

SFF-8402

SFF Committee, Specification for SFP+ 1X 28 Gb/s Pluggable Transceiver Solution (SFP28)

SFF-8431

SFF Committee, Specifications for Enhanced Small Form Factor Pluggable Module SFP+

SFF-8436

SFF Committee, Specification for QSFP+ 10 Gbs 4X Pluggable Transceiver

SFF-8472

SFF Committee, Specification for Diagnostic Monitoring Interface for Optical Transceivers

SFF-8665

SFF Committee, Specification for QSFP+ 28 Gb/s 4X Pluggable Transceiver Solution (QSFP28)

CFP4 HW Spec

CFP MSA, CFP4 Hardware Specification

CFP MSA MIS

CFP MSA Management Interface Specification, 100/40 Gigabit Transceiver Package Multi-Source Agreement