Keysight Technologies N4891A Manuale utente

Keysight N4891A 400GBASE

FEC-Aware Rx Test Solution

Getting Started

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from

Keysight Technologies as governed by

United States and international copyright

laws.

Manual Part Number

N4891-90118

Edition

First edition, March 2020

Keysight Technologies Deutschland GmbH

Herrenberger Strasse 130,

71034 Böblingen, Germany

Technology Licenses

The hardware and/or software described in

this document are furnished under a license

and may be used or copied only in accor-

dance with the terms of such license.

U.S. Government Rights

The Software is “commercial computer soft-

ware,” as defined by Federal Acquisition

Regulation (“FAR”) 2.101. Pursuant to FAR

12.212 and 27.405-3 and Department of

Defense FAR Supplement

(“DFARS”) 227.7202, the U.S. government

acquires commercial computer software

under the same terms by which the software

is customarily provided to the public.

Accordingly, Keysight provides the Software

to U.S. government customers under its

standard commercial license, which is

embodied in its End User License Agreement

(EULA), a copy of which can be found at

http://www.keysight.com/find/sweula. The

license set forth in the EULA represents the

exclusive authority by which the U.S. gov-

ernment may use, modify, distribute, or dis-

close the Software. The EULA and the

license set forth therein, does not require or

permit, among other things, that Keysight:

(1) Furnish technical information related to

commercial computer software or commer-

cial computer software documentation that

is not customarily provided to the public; or

(2) Relinquish to, or otherwise provide, the

government rights in excess of these rights

customarily provided to the public to use,

modify, reproduce, release, perform, dis-

play, or disclose commercial computer soft-

ware or commercial computer software

documentation. No additional government

requirements beyond those set forth in the

EULA shall apply, except to the extent that

those terms, rights, or licenses are explicitly

required from all providers of commercial

computer software pursuant to the FAR and

the DFARS and are set forth specifically in

writing elsewhere in the EULA. Keysight

shall be under no obligation to update,

revise or otherwise modify the Software.

With respect to any technical data as

defined by FAR 2.101, pursuant to FAR

12.211 and 27.404.2 and DFARS 227.7102,

the U.S. government acquires no greater

than Limited Rights as defined in FAR 27.401

or DFAR 227.7103-5 (c), as applicable in any

technical data.

Warranty

THE MATERIAL CONTAINED IN THIS

DOCUMENT IS PROVIDED "AS IS," AND IS

SUBJECT TO BEING CHANGED, WITHOUT

NOTICE, IN FUTURE EDITIONS. FURTHER,

TO THE MAXIMUM EXTENT PERMITTED BY

APPLICABLE LAW, KEYSIGHT DISCLAIMS

ALL WARRANTIES, EITHER EXPRESS OR

IMPLIED WITH REGARD TO THIS MANUAL

AND ANY INFORMATION CONTAINED

HEREIN, INCLUDING BUT NOT LIMITED TO

THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE. KEYSIGHT SHALL

NOT BE LIABLE FOR ERRORS OR FOR

INCIDENTAL OR CONSEQUENTIAL

DAMAGES IN CONNECTION WITH THE

FURNISHING, USE, OR PERFORMANCE OF

THIS DOCUMENT OR ANY INFORMATION

CONTAINED HEREIN. SHOULD KEYSIGHT

AND THE USER HAVE A SEPARATE WRITTEN

AGREEMENT WITH WARRANTY TERMS

COVERING THE MATERIAL IN THIS

DOCUMENT THAT CONFLICT WITH THESE

TERMS, THE WARRANTY TERMS IN THE

SEPARATE AGREEMENT WILL CONTROL.

Safety Notices

CAUTION

A CAUTION notice denotes a hazard. It

calls attention to an operating proce-

dure, practice, or the like that, if not

correctly performed or adhered to,

could result in damage to the product

or loss of important data. Do not pro-

ceed beyond a CAUTION notice until the

indicated conditions are fully under-

stood and met.

WARNING

A WARNING notice denotes a hazard. It

calls attention to an operating proce-

dure, practice, or the like that, if not

correctly performed or adhered to,

could result in personal injury or death.

Do not proceed beyond a WARNING

notice until the indicated conditions are

fully understood and met.

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide 3

Contents

1 Introduction

Safety Issues 6

Safety and damage messages 6

Safety Warnings 6

Introduction to the N4891A Solution 7

N4891A 400G Multi-Port Tester 7

N4891A 400GBASE FEC-aware Receiver Test Solution 7

Specifications 8

2 Getting Started with the N4891A Solution

Chassis Setup 10

Installing the N4891A equipment 10

Front Panel Overview 12

Controlling the Equipment 13

Connecting to the N4891A chassis 13

Configuring the Hostname 14

Setting up the N4891A solution 14

Installing License 16

4 Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide

Contents

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution

Getting Started Guide

1Introduction

Safety Issues / 6

Introduction to the N4891A Solution / 7

Specifications / 8

1 Introduction

6 Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide

Safety Issues

Safety and damage messages

The safety alert symbol is used to indicate a hazard. Specific keywords and additional

graphical representations are used to explain the specific nature of each hazard. describes the safety

warning and equipment damage icons and textual conventions used in this document.

Table 1 Types of hazard

Safety Warnings

Reliable Earthing

Protective earthing connection of the socket-outlet should be verified by a SKILLED PERSON.

Touch Current from Coaxial Cables

Connect the shield coaxial cables to building earth in accordance with applicable local, national, and

international electrical codes.

Fan Instruction

Moving fan blade. Keep body parts away from fan blades.

Type of Hazard Icon Description

CAUTION Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.

WARNING

Indicates a hazardous situation that, if not avoided, could result in death or serious injury.

Additional icons are used to indicate specific types of warnings.

Laser radiation hazard warning.

Electrostatic discharge hazard warning.

High voltage hazard warning.

Hot surface hazard warning.

Moving fan blades hazard warning.

NOTICE Indicates a condition or occurrence that could result in property damage.

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide 7

Introduction 1

Introduction to the N4891A Solution

N4891A 400G Multi-Port Tester

The N4891A is a compact Bit Error Rate (BER) and Forward Error Correction (FEC) test system. You

can use it to characterize and quantify, at line rate, the actual BER and FEC performance of silicon

communication devices, ASICs, fiber and copper interconnects, optical transceivers, and the port

electronics of switches, routers, and other networking equipment with 26.5625 Gbaud PAM4

interfaces. You can also use it to test the interconnection interoperability for all types of networking

devices and equipment.

It is available in two models: 2-port or 4-port. The 2-port model is field-upgradeable to 4 ports.

For both models, an optional RS-544 (KP4) FEC test capability is available that simplifies FEC lane

testing.

The N4891A is powered by IXIA's KiOS operating system, and includes Layer 1 BERT 400GE test

software. A browser-based user interface makes it easy to run tests and manage the N4891A

equipment. Keysight N4891A and Ixia A400GE-QDD offer the same capabilities and are

interchangeable.

The N4891A chassis can be mounted on a bench-top or in a rack. See “Installing the N4891A

equipment” on page 10 for more information.

N4891A 400GBASE FEC-aware Receiver Test Solution

When used in combination with the Keysight M8040A, the N4891A offers a unique 400GBASE

FEC-aware Receiver Test Solution. This solution enables measurement of frame loss ratio in 400G

Ethernet links using FEC by supplying one stressed lane, while maintaining the proper FEC striped

test pattern data. The test method is prescribed in the IEEE 802.3 standard clauses 121,122, 124 and

136, 137 and 138 (802.3bs and 802.3cd respectively). This solution provides unique insights to

understand how component and system design trade-offs are affected by Forward Error Correction

(FEC) requirements and to predict the system margin under realistic conditions.

For more information regarding the M8040A J-BERT system, refer to

https://www.keysight.com/find/M8040A.

1 Introduction

8 Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide

Specifications

Table 2 lists out the specifications for various characteristics of the N4891A chassis.

Table 2 N4891A Specifications

Device Characteristics Specification values

Physical Interfaces Native QSFP-DD MSA compatible physical ports

Chassis Configurations 2- or 4-port base chassis system, desktop or rack mount, 2 RU

Chassis Connector Systems Power ON/OFF button

1 LED per port

Clock IN / OUT: 2 SMA female connectors

Trigger IN / OUT: 2 SMA female connectors

4 USB: (2) USB 2.0 (2) USB 3.0 compatible ports

1 RJ45: 1000/100/10Mbps Ethernet management port

1 Display Port, supports a maximum resolution of 4096 x 2304 @60Hz

Chassis Clock IN – Electrical Specifications Frequency: 166.015625 MHz +/- 100 PPM

50 ohm termination

Minimum = 0.5 Vpk-pk = 0.18 Vrms (sine)

Maximum = 3.0 Vpk-pk = 1.06 Vrms (sine)

Chassis Clock OUT – Electrical Specifications Frequency: 166.015625 MHz +/- 100 PPM

HCSL, 50 Ohm

VOH > 0.55V, VOL < 0.15V, Swing > 0.55V

Hardware Trigger IN / OUT – Electrical

Specifications

Trigger In: 50 ohm termination; Minimum = -1.0V, Maximum = +4.0V, Swing > 0.2V

Trigger Out: HCSL, 50 ohm; VOH > 0.55V, VOL < 0.15V, Swing > 0.55V

Chassis System Electrical Power Operates on 100-240VAC, 50/60Hz,

•8 Amps on 100-125VAC

•4 Amps on single phase, 200-240VAC

Chassis System Dimensions 11.14” (L) x 17.4” (W) x 3.65” (H)

283mm (L) x 442mm (W) x 92.65mm (H)

Chassis System Weights Hardware only: 21.75 lbs. (9.87 kg)

Shipping: 30.49 lbs. (13.83 kg)

Includes rack mount ears, cable support bracket, power cord, accessories and packaging.

Temperature Operating: 41°F to 95°F (5°C to 35°C)

Storage: 41°F to 122°F (5°C to 50°C)

Humidity Operating: 0% to 85%, non-condensing

Storage: 0% to 85%, non-condensing

Regulatory Compliance Specifications IEC 60950-1, UL 60950-1, CSA C22.2 No.60950-1, IEC 62368-1, UL 62368-1,

CSA 62368-1, CE (LVD, EMC, RoHS), EN/IEC 55032, EN/IEC 55024, CFR 47, FCC Part 15B, ICES-003, AS/NZ CISPR

32/24, KN32/35

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution

Getting Started Guide

2Getting Started with the

N4891A Solution

Chassis Setup / 10

Front Panel Overview / 12

Controlling the Equipment / 13

Installing License / 16

2 Getting Started with the N4891A Solution

10 Keysight N4891A 400GBASE FEC-Aware Rx Test Solution Getting Started Guide

Chassis Setup

The workflow to install and use a new N4891A chassis is as follows:

1 Unpack the N4891A.

2 Attach the accessories depending on how you will mount the equipment (see “Installing the

N4891A equipment” on page 10):

• On a bench: Attach the rubber feet.

• In a rack: Attach the mounting ears and then insert the N4891A chassis into the rack.

3 Connect the N4891A's management port to a network, and obtain an IP address.

4 Activate the license for the N4891A.

5 Connect the N4891A to the DUT.

6 Access the KiOS software and begin testing.

Installing the N4891A equipment

The N4891A chassis can be mounted on a bench or in a rack.

Bench mounting

To mount the N4891A chassis on a bench, install the four rubber feet to the bottom of the unit, one

at each corner, using the supplied screws. Refer to Figure 1.

Figure 1 Illustration for bench mounting the N4891A chassis

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