Keysight N4891A 400GBASE FEC-Aware Rx Test Solution

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution

Getting Started

Notices© Keysight Technologies 2020

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 NumberN4891-90118

Edition

First edition, March 2020

Keysight Technologies Deutschland GmbHHerrenberger Strasse 130,71034 Böblingen, Germany

Technology LicensesThe 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.

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(“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

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Warranty

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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

Contents

1 Introduction

Safety Issues 6Safety and damage messages 6Safety Warnings 6

Introduction to the N4891A Solution 7N4891A 400G Multi-Port Tester 7N4891A 400GBASE FEC-aware Receiver Test Solution 7

Specifications 8

2 Getting Started with the N4891A Solution

Chassis Setup 10Installing the N4891A equipment 10

Front Panel Overview 12

Controlling the Equipment 13Connecting to the N4891A chassis 13Configuring the Hostname 14Setting up the N4891A solution 14

Installing License 16

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

Contents


Getting Started Guide

1 Introduction

Safety Issues / 6Introduction to the N4891A Solution / 7Specifications / 8

1 Introduction


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.


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.

https://www.keysight.com/en/pd-2694474-pn-M8040A/64-gbaud-high-performance-bert?pm=PL&nid=-32914.1176817&cc=IN&lc=eng

1 Introduction


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 button1 LED per portClock IN / OUT: 2 SMA female connectorsTrigger IN / OUT: 2 SMA female connectors4 USB: (2) USB 2.0 (2) USB 3.0 compatible ports1 RJ45: 1000/100/10Mbps Ethernet management port1 Display Port, supports a maximum resolution of 4096 x 2304 @60Hz

Chassis Clock IN – Electrical Specifications Frequency: 166.015625 MHz +/- 100 PPM50 ohm terminationMinimum = 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 PPMHCSL, 50 OhmVOH > 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 > 0.2VTrigger 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-condensingStorage: 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


Getting Started Guide


Chassis Setup / 10Front Panel Overview / 12Controlling the Equipment / 13Installing License / 16



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


Getting Started with the N4891A Solution 2

Bench mounting

To mount the N4891A chassis in a rack (refer to Figure 2):

1 Install the mounting ears (one at each corner).

2 Insert the N4891A chassis into the rack and fasten the ears to the rack.

Figure 2 Illustration for bench mounting the N4891A chassis



Front Panel Overview

The N4891A front panel includes the following components:

• Power ON/OFF button

• 1 link/activity 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 ports

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

• 1 Display Port supporting a maximum resolution of 4096 x 2304 @60Hz



Controlling the Equipment

Connecting to the N4891A chassis

The N4891A is pre-configured to obtain an IP address over DHCP. To setup N4891A and to use it for testing, you must find the IP address assigned to it.

There are two methods you can use to find the IP address assigned to the N4891A:

• DisplayPort: You can plug a monitor into the DisplayPort on the front panel.

• USB flash drive: After booting and obtaining an IP address, the N4891A chassis automatically copies its address to a USB flash drive inserted into any of the USB ports.

DisplayPort method

1 With the N4891A chassis powered off, connect one end of an Ethernet cable to the management port of the chassis, and connect the other end to a switch port that has access to a network that includes a DHCP server.

2 Connect a monitor to the DisplayPort on the front panel of the N4891A chassis, and a keyboard and mouse to the USB ports.

3 Power on the N4891A chassis.

4 Use either a web browser or a console window to fetch the IP address.

• Web Browser:

i Launch a browser window.

ii In the URL field, type localhost.

iii When the Landing page appears, select System Admin from the main menu (in the upper right corner).

iv Note the IP address from the Linux OS attributes.

Figure 3 Finding IP address using the web browser



• Console window:

i Launch a console window on the N4891A chassis.

ii Use the ifconfig command to display the IP address.

Flash Drive method


2 Insert a thumb drive into and of the USB ports.


4 Remove the flash drive and use a file explorer to find a file named hostname.txt in the root directory of the file system on the flash drive.

5 Open the hostname.txt file and make a note of the IP address in it.

Configuring the Hostname



3 Launch a terminal window to the N4891A chassis.

4 Use the following command to set the host name:

hostnamectl set-hostname <host name>

Setting up the N4891A solution

The setting up of the N4891A 400GBASE FEC-aware Receiver Test Solution requires following additional steps:

1 Connect the ‘Clock Out’ of the N4891A chassis to the ‘Ref CLK In’ of the M8045A pattern generator.

2 Connect the ‘Trigger Out’ of the N4891A chassis to the ‘Ctrl In A’ of the M8045A pattern generator.

3 Connect the device under test (DUT).

i Plug a QSFP-DD HCB Tx breakout adapter in an N4891A port.

ii Connect lanes #2-8 of the QSFP-DD HCB Tx breakout adapter to a module compliance board (MCB).

iii Terminate lane #1 of the QSFP-DD HCB Tx breakout adapter with a 50Ohm terminations.

4 Connect the M8045A pattern generator data out signal (from M8057A/B remote head) to the remaining MCB lane loopback the DUT to a different N4891A port.

i Using a compatible QSFP-DD module or cable.

ii Using a QSFP-DD HCB Rx breakout adapter.



Figure 4 Connection diagram sample for the N4891 solution



Installing License

You must install and activate the license for the KiOS software before you can use it.

Before you begin, ensure that you:

• know the MAC address of the N4891A chassis (you can find the MAC address on the System Admin page)

• have a valid license

To activate a license:

1 Ensure that you know the IP address assigned to the N4891A chassis.

2 On a PC that can access the same network as the N4891A chassis is on, open a browser window and enter the IP address into the URL field.

The KiOS software landing page is displayed.

3 In the Settings menu, select Settings | License.

The License Manager page is displayed.

Figure 5 The License Manager page in KiOS software

4 On the License Manager page, click the MyKeysight.com link at the top of the page.

5 Login to the Keysight website, and download your license file.

6 On the License Manager page, select Add New License.

7 Select Choose File, then select the license file.

8 Select OK to add the license file to the KiOS.

NOTE After license options are installed, the Options field in the kiOS table of the SYSTEM ADMIN displays ‘4 Ports’ as 4P, ‘-KP4 option’ as FEC and ‘-SYC option’ as LOKI.

https://mykeysight.com/



Table 3 shows the fields that appear in the License Manager page along with their description.

Table 3 License Manager fields and description

License Manager field Description

Feature Feature enabled after installing the license.

Description Description of the licensed feature.

Version Version of the licensed feature.

Expiration Date and time that the license shall expire.

Type Type of license.

Count Number of licenses installed.

Location Location where license is stored.

Filename Name of the license file.



NOTE For more information regarding the functionality and usage of the N4891A solution, refer to the Keysight N4891A 400GBASE FEC-Aware Rx Test Solution User Guide.

This information is subject to change without notice.© Keysight Technologies 2020March 2020

www.keysight.com

http://www.keysight.com

Keysight N4891A 400GBASE FEC-Aware Rx Test Solution

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