Physical Layer changes coming to a network near you, soon! Wayne Allen Regional Marketing Engineer Fluke Networks

Transcription

1 Physical Layer changes coming to a network near you, soon! Wayne Allen Regional Marketing Engineer Fluke Networks

2 Agenda New ISO/IEC Standard New Fibre standards and encoding methods Higher speeds, less loss allowed, new fibre types. New Power over Ethernet standards to publish shortly. Higher power that requires additional field testing for assurance Modular Plug Terminated Links What are they and how to test Higher speeds on legacy cabling NBASE-T technology Single Pair Ethernet is coming

3 New ISO/IEC Standard ISO/IEC Generic Cabling for Customer Premises has being broken into 6 parts. Current version is now ISO/IEC Ed3, published late in will be Generic Cabling will be Office Premises will be Industrial Premises (replaces ISO/IEC 24702) will be Residences (replaces ISO/IEC 15018) will be Data Centres (replaces ISO/IEC 24764) will be Distributed Building Services. (new standard) ANZ will be adopting this new version

4 Major changes in ISO/IEC Ed. 3 Minimum requirement for office premises is Class E (Cat 6) cabling but for applications above 1Gbps, Class E A (Cat 6A) to be used. Minimum requirement for Data Centre cabling and Distributed Building Services is Class E A (Cat 6A). Class I (Cat 8.1) and Class II (Cat8.2) introduced. 2GHz, 30m, 2 connector channel. OM1, OM2 and OS1 no longer supported for new installs. OM5 added for SWDM applications. OS1a introduced for tight buffered low water peak cables. 12 and 24 fiber MPOs are now specified for the Equipment outlets in Data Centres. Length measurement is normative with Loss Measurements.

5 Recently completed standards IEEE 802.3bs 200G and 400G on Fibre The need for speed being driven by the IoT» Do more with less fibre is the key theme

6 Nearly completed standards IEEE cd - 50G, 100G and 200G Supports the technologies on the previous slides» Reduction on lanes required to support the speed New encoding used PAM4

7 Emerging Ethernet Technologies Fibre based Technologies New encoding methods to increase data rates. More data with the same fibre Traditionally we have been using forms of NRZ encoding» Not very efficient Enter PAM 4 encoding» More efficient Allows us to double the data rate No increase in Bandwidth required» We do trade SNR by up to a 1/3.

8 Wideband Multimode Fiber OM5 (WBMMF) Optical characteristics other than bandwidth remain essentially the same. Field Testing is the same as OM4 Test as normal with duplex fiber OLTS Encircled Flux compliant Wavelengths at 850/1300nm Bounds all wavelengths between l1 l2 l3 l4 Testing l s

9 Power over Ethernet changes IEEE 802.3bt 4 pair Power over Ethernet Now technically complete and no new features to be added Type 1 and Type 2 PSE devices are as per 802.3af and 802.3at standards Type 3 and Type 4 PSE devices added, 60W and 90W respectively» Updated end types to support 2.5G, 5G and 10G Ethernet» New midspan PSE to support the higher speeds Warning added not to use smaller than 26AWG cabling with PoE Cabling standards working on 28AWG solutions to enable its use. Out for sponsor ballot, expected to publish Q

10 Introducing IEEE 802.3bt PoE ++ Why should I be interested in PoE ++? Savings in costs Think of not having to run AC Power outlets Wireless Access points without AC outlets CCTV Cameras without AC outlets Smart Lighting Systems Smart LED Data Centre Lighting, only on where you need it, powered from the data cables. No expensive banks of AC powered fluorescent lighting Building Access Control Intelligent locking systems run from the network cabling Other uses? High Definition displays, powering PCs, DAS, 4G/5G Small Cells etc etc

11 The problem! One of the issues with PoE is how it works We usually accomplish the power transfer by injecting our source power into centre taps on the balun transformers used at the interfaces of the Power Sourcing Equipment, and recover via centre tapped baluns at the Powered Device. Below is how we achieve the transfer. PSE PD

12 The problem! One of the issues with PoE is how it works The Powered Device completes the current loop enabling the device to work The current is balanced across all 4 wires used.

13 Introducing IEEE 802.3bt 90W PoE We now have all 4 pairs delivering the power. Each pair has to meet the Resistance Unbalance requirement <3% Plus, we now need to have Resistance Balance between the pairs <7% PSE I Load 48V DC I Load WAP Powered Device

14 Testing Twisted Pair Cabling for PoE use No PoE working here!

15 What is Resistance Unbalance? Proposed extended tests for field testing that allows an installed link to be evaluated for PoE transmission. Adds a Loop Resistance check (Already an ISO requirement) Adds a DC Resistance Unbalance check within the pairs 2.106Ω Ω Loop Resistance = = 3.22 Ohms DC Resistance Unbalance = = Ohms

16 What is Resistance Unbalance? Proposed extended tests for field testing that allows an installed link to be evaluated for PoE transmission. Adds a Loop Resistance check (Already an ISO requirement) Adds a DC Resistance Unbalance check within the pairs Adds a DC Resistance Unbalance check between the pairs 1.151Ω 1.149Ω Ω Parallel Resistance = 2.106*1.114 = Ohms Parallel Resistance = 1.151* Ω Loop Resistance = = 3.22 Ohms DC Resistance Unbalance = = Ohms 1 2 = Ohms Pair 2 Pair Unbalance = = Ohms

17 WAPs and IP Cameras The far end is typically hardwired with an RJ45 plug. Used in CCTV and PoE wireless access points Is this a Permanent Link or Channel test? Today, it is not defined in ANSI/TIA or ISO/IEC. ANSI/TIA D (Draft) includes Modular Plug Terminated Link (MPTL) in Annex F Will use a Permanent Link limit

18 Modular Plug Terminated Link ANSI/TIA 568.D-2 (Draft) as Annex F To be published by the end 2018 Requires a patch cord adapter for the category being tested Max. 295 ft. (90 m) Use Category 6A Cabling ISO is moving to adopt the same approach ANZ will be using this method of testing Check with the company issuing the warranty

19 New copper speeds Ethernet speeds on copper are evolving Newer speeds have been developed on the back of the 10GBASE-T standard. 19

20 (Mbps) APs ac Transitions Drive Wired Bandwidth Needs ac Wi Fi exceeds 1GB Transition from 11n to 11ac is happening quickly Enterprise AP Radio Bandwidth Enterprise ac AP Transition Source: Dell Oro Group Wireless LAN 5-year Forecast Jan 2016 Wave 1 Wave 2 Low Mid High Theoretical in time: : g/a : n : ac W : ac W

21 The Applications Spaces of BASE-T Data Rate

22 NBASE-T and 802.3bz Technology Based on 10GBASE-T PAM-16 with the same LDPC code for good performance Good interoperability, improved robustness Upper frequency of ½ (5G) and ¼ (2.5G) that of 10GBASE-T NBASE-T and 802.3bz are interoperable with each other Joint Ethernet Alliance/NBASE-T Alliance plugfest in late 2016 Auto Negotiation enables multi-mode PHY operation Supports PoE!

23 IEEE 802.3bz or NBASE-T? Since they are interoperable with each other, how do they differ? NBASE-T adds Downshift to 802.3bz Normal Auto Negotiation selects the fastest rate both PHYs support, irrespective of the cabling, noise or environment But, in 2.5G/5GBASE-T, the speed you get may depend on other links crosstalking So... Downshift automatically shifts the rate based on the channel noise With Downshift users always get a reliable link IEEE 802.3bz functionality Automatic Downshift NBASE-T 2.3 functionality

24 Using Cat5e and Cat6 at 2.5 and 5Gig Internal crosstalk (NEXT, return loss) has low risks Category 5e will likely meet 5GBASE-T requirements Category 6 has no risks of meeting 2.5 and 5GBASE-T internal requirements Alien crosstalk has elevated risks Vast majority of links have very low risks Risk with Category 5e and 6 cables on long bundled (> 75 meters) runs Refer to SNR risk matrix Cable Bundle: A group of cables that are tied together or in contact with one another in a closely packed configuration for at least 1 m.

25 Alien Crosstalk concerns ALSNR Analysis Alien Limited Signal to Noise Ratio Low risk for bundles up to 50 meters, regardless of channel length Limited risk for bundles up to 75 meters No risk when using Category 6A ALSNR Risk Matrix

26 Category 5e Cabling Supports NBASE-T NBASE-T limits are the same as Category 5e for NEXT and Return Loss However 5 Gigabit limits are based on Category 5e limits extrapolated out to 250 MHz To be sure that your existing cabling will support 2.5 and 5 Gigabits you need to compare your test results to limits out to 250 MHz How was your cabling certified? To What Standard? Did you store your test data?

27 You need to be able to evaluate! For 2.5G Base-T you need your Cat 5e test results Your tests must pass For PoE use, check your Resistance For 5G Base-T you will need extended results out to 250MHz We can see that with NEXT We can also test for it 27

28 Single Pair Ethernet 802.3cg 10 Mbps 1 KM 10 connectors Building Sensors and Automation applications Multiple candidates for a connector Some limits are in the testers today, more coming 100BASE-T1 and 1000BASE-T1

29 To Conclude New standards are going to drive what products we use in our physical layers Best to get it right sooner, rather than later be prepared We are going to be facing higher speeds over our cabling We are going to be transferring higher power over copper cabling We have a new link model to contend with MPTL We are going to be using less pairs. Will your current cabling allow all this to happen?

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