Home / AFL Blog / March 2017 / 5 Best Practices for Certifying Next Generation Networks: Bi-Directional Measurements
Blog posts A- A+

5 Best Practices for Certifying Next Generation Networks: Bi-Directional Measurements

This blog is part three of a series. See article onearticle two and article three.

While a single direction loss measurement method is initially quicker and cheaper, a bi-directional method is preferable for more reliable overall network characterization, since it significantly reduces the likelihood of rework and associated costs. Some standards, including ISO/IEC 14763-3, require bi-directional testing to eliminate risk of loss resulting from unknown components.

Historically, the attenuation differences due to test direction were of minor consequence and in line with the accuracy and repeatability of the test method. Therefore, testing in only one direction normally sufficed.

However, with the advent of higher speed systems, tighter loss budgets and bend insensitive fibers, testing in both directions is increasingly required by users to detect mixing of fibers of different core sizes. In addition, field termination and polishing of connectors as well as field splices can potentially result in varying test measurements depending on direction.

One advantage of bi-directional testing is that any mismatches due to difference in fiber type will be accounted for. For example, light travelling from a larger core to a slightly smaller one (or from 62.5 µm to 50 µm) will exhibit more attenuation in one direction than the other. Consequently, it is essential to measure both directions. 

As loss budgets tighten, many equipment manufacturers also require bidirectional measurements for purposes of providing a system or cabling infrastructure warranty. Certification Kits that perform bi-directional tests within a single port (i.e. no swapping of fibers required) will not only be more efficient but also yield more consistent results as there is no opportunity for added contamination during dis-connect and re-connect.

Since MPO links/parallel optics utilize a scheme where light is transmitted and received over different fibers within the same connection, it’s critical to test MPO links in both directions to assure performance.

40GbE Base 8 Configuration utilizes 8 fiber channels – 4 in each direction                                                

True bidirectional measurements provide simplified certification eliminating the need for processing and merging unidirectional data into one final result. Further, bidirectional certification provides a level of flexibility for the network operator to reconfigure fibers without worrying about whether testing was completed in a particular direction.

Be sure to perform bi-directional measurements to ensure the highest performance, regardless of network application.

Have any questions? Feel free to contact us.

Posted: 3/3/2017 by Sami Melton | with 0 comment(s)
Filed under: AFL, Best Practices, Certification, Networks, Test and Inspection
Comments
Blog post currently doesn't have any comments.
Leave comment



 Security code

Recent Posts

How to Avoid Network Degradation

6/18/2018 1:43:23 PM | with 0 comments
Inspecting your network and cleaning fiber correctly can prevent losing critical information that passes through your network everyday.  AFL provides data center cleaning and inspection "Best Practices" as part of AFL's role as an end-to-end solutions provider.  Read more to learn about the step-by-step data cleaning procedure and the products available to avoid network degradation.  


Video: Proper Splicing, End Cable Entry and Mid-Sheath Entry Procedures for Wrapping Tube Cable

6/1/2018 8:06:50 AM | with 0 comments
Videos demonstrate the proper procedures for splicing, end cable entry and mid-sheath entry for AFL Wrapping Tube fiber optic cable.

The Path to 100G Single Lambda in the Data Center - Part 6

5/10/2018 12:52:43 PM | with 0 comments
There have been a significant number of key photonic component and technology announcements since the last installment of this blog series.  These announcements are clear evidence of the growing industry ecosystem support for 100Gbps single lambda (100GSL), enabling 200G and 400G Ethernet links in enterprise and hyperscale data center optical networks.

Product Registration of Test Equipment – It is important!

2/15/2018 10:02:34 AM | with 0 comments
No matter what you purchase these days, manufacturers include product registration cards. Even inexpensive consumer products like Bluetooth head phones and toasters come with product registration cards. 

The Path to 100G Single Lambda in the Data Center - Part 5

10/27/2017 1:46:38 PM | with 0 comments
There has been great deal of activity in the electro-optic component and subsystem segments relating to this next generation leap forward – turns out that 100G single lambda is a super-hot topic in Fall 2017. As the EO components are enabling ingredients in next gen 100G single lambda transceivers, assessing commercial status is worthwhile in terms of helping to predict system-level timelines for this exciting technology.

Blog Tags

100G 12R 12S 2014 2015 2016 21s 22S 62S 70R 70S Access Networks accessories ADSS Aeros AFL AFL. Air Blown Fiber AlumaCore Aluminum APM-101 APM-102 APTA ASIS Associates Best Practices BICSI bus Cable Cable-Tec Careers Case Studies Catalogs Cell Tower Demarcation Certification Cleaning Cleaning Supplies Cleaver CO2 Lasers Community Outreach compression Compression Accessories Conductor Connections Connectivity Connectors Co-ops Core-alignment Corporate CT-30 CTIA CWDM DAS Data Center Dead Ends Demonstration Dura-Line DWDM eABF electric Enclosure Enterprise Equipment ESB Expo Exterior Distribution Cabinet Facebook Fall Fall 2013 FAST SC FASTConnect FC Features Fiber Fiber Cleaver Fiber Connector Inspection Fiber Distribution Fiber Laser Fiber Optic Fiber Optic Cable Fiber Optic Intrusion Detection System Fiber Optic Training Fiber OpticTraining Fiber Prep Fiber Security Fiber Shaping Fiber Splicing fibre optic cable Field Splicer flexscan Flickr FOCIS FSM-100 FTTh FTTx Fujikura FuseConnect Fusion Fusion Splicer Fusion Splicers Fusion Splicing Glass Processing Google Governor Nikki Haley Grand Canyon Greenville Grounding Hardware High-Wire Walk HiTemp IDEAA IEEE infrastructure Inspection Instagram Install Installation Installing Instructions Integrated Solution International Sales Meeting Interns Kit Laser Last Mile LAZERMaster LC Light Brigade LightLink LightWave LinkedIn live line LL580 LL-580 LMHD LZM-100 M210 M310 Maintenance Metro Ethernet Metro-E MicroCore Mining Month of Service MSOs Network Networks Nik Wallenda Noyes OEM One-Click OPGW Optic Optical Optical Connectivity Optical Sensing OSP OTDR Outside Plant PCS-100 Stripper Perimeter Security System PES Photonics Photonics West PhotonicsWest PM Splicing Poli-Mod power Procedures Product Registration Products Rail Railway Recoater Recruiting Resources Rogue Rural Utilities Rusty Williams SB01 SC SCADA SCTE SDN Selection Sensing Services single circuit outage Single Lambda SkyWrap Small-Cell Smart-Grid Smartphone Social Software Defined Networking Solutions Specialty Splicer SPIE Splice Enclosure Splicer Splicers Splicing ST Stockbridge Dampers Stranded Stainless Steel Cable substation SuperMobility Support SWAGE Swaging System systems T&D Terminal Termination Instructions Test Test &Inspection Test and Inspection Testing Titan Tools Trade Shows Training Transit transmission Transportation Twitter Upstate Alliance Utility VFI V-Groove Video Vodafone WDM WDM900 We Connect Webinar Website White Paper White-Paper Wi-Fi Winter Wireless Wrapping Tube Cable

Sign Up for eConnect!