Optical multi-speed splitting

Transcription

1 Optical multi-speed splitting For Xena 00 G and 40 G test modules Xena 00GE and 40GE test modules can support 00 Gbps, 50 Gbps, 40 Gbps, 25 Gbps and 0 Gbps port speeds depending on test module, transceiver and in some cases splitter cables. This Application Note describes what can be achieved with the modules and describes various topics related to this context. Finally, it includes an example on how to configure a 00 G test module to speeds supported by the module.

2 Contents Application Note... 3 Transmission of 40 Gbps and 00 Gbps signals... 4 Naming of 00 G to 0 G Interface Options... 5 What is the difference between 00GBASE-LR4 and 00GBASE-CWDM4?... 5 Direct Attached Cables (DACs) and Active Optical Cables (AOC)... 5 Optical Connectors... 6 Break Out Cables and Splitter Cables... 7 Splitter Cassette P/N SR0-2xSR Multiple Port Speeds in Xena 00 G and 40 G test modules... 9 What goes where?... 4 Configuring Xena 00 G and 40 G test modules... 5 SR0 <-> 2 x LC MMF Splitter Cable... 9 SR4 <-> 4 x LC and ism4 <-> 4 x LC splitter cables

3 APPLICATION NOTE Xena Networks 00GE and 40GE test modules can support 00 Gbps, 50 Gbps, 40 Gbps, 25 Gbps and 0 Gbps port speeds depending on test module, transceiver and in some cases splitter cables. This Application Note describes what can be achieved with the test modules and explains various related topics like: The use of parallel paths for transmission of high speed signals Naming conventions for 00 G to 0 G Interface options The difference between 00GBASE-LR4 and 00GBASE-CWDM4 Optical connectors used for high speed transmission You will find information on transceivers, cables and other items available from Xena Networks. You can also see how these that can be used with the Xena 00GE and 40GE test modules in the What Goes Where section. Finally, the Application Note includes an example on how to configure a 00 G test module to the speeds supported by the module. 3

4 TRANSMISSION OF 40 GBPS AND 00 GBPS SIGNALS When 40 Gbps communication signals are transmitted between communication devices, they are sent as 4 parallel 0 Gbps streams (lanes). For 00 Gbps signals there are two options: The signals are either sent as 0 parallel 0 Gbps lanes or 4 parallel 25 Gbps lanes. For the physical media between communications devices there are two options: Very short ranges (up to 7 meters): Electrical cables are normally used as they are cost effective. Longer distances: Optical cables are used. For distances up to 00 meters multimode cables can be used; for longer distances the more expensive single mode cables are needed. Optical 40 Gbps and 00 Gbps can be sent in two ways:. As 4 (or 0) physical signals. This means that 4 (or 0) optical fibers are needed between the communication devices (multi-fiber connections). Figure : Several fibers between devices 2. With 4 (or 0) optical wave lengths using Wavelength Division Multiplexing (WDM) techniques. This means that the signals are sent as several different wavelengths (or colors) in parallel over a single optical fiber. This is used for longer distances as only one optical cable is required. Figure 2: A single fiber between devices several wavelengths are used 40 Gbps and 00 Gbps Multimode fiber optic systems are normally implemented as multi-fiber connections, while Single Mode fiber optic systems normally use WDM techniques. However Single Mode fiber optic can also use multi-fiber connections, which is also known as Parallel Single Mode (PSM) or PSM4 when 4 fibers are used in parallel. Electrical 40 Gbps and 00 Gbps are always sent as 4 (or 0) physical electrical signals, which means that 4 (or 0) electrical cables are needed between the devices. 4

5 NAMING OF 00 G TO 0 G INTERFACE OPTIONS 00 G to 0 G Interface options are normally named xxxgbaseyy#, where xxx indicates the speed (xxx=00 means 00 Gbps, XXX= 40 means 40 Gbps and so on yy typically indicates reach and cable type: o yy=cr means very short reach on an electrical Copper cable o yy=sr means short reach on a multimode optical fiber o yy=lr means long reach on a single mode optical fiber o yy=er means extended reach on a single mode optical fiber # shows number of lanes i.e. #=4 for 4 lanes and #=0 for 0 lanes WHAT IS THE DIFFERENCE BETWEEN 00GBASE-LR4 AND 00GBASE-CWDM4? There are two versions of 4 lane 00 Gbps optical WDM systems running on a single mode fiber: 00GBASE- LR4/ER4 and 00GBASE-CWDM4 (CWDM = Coarse Wavelength Division Multiplex). 00GBASE-LR4 and 00GBASE-ER4 are both defined by IEEE in IEEE 802.3ba; 00GBASE-CWDM4 is defined by CWDM4 MSA group as a lower cost alternative for distances up to 2 km in data center applications. Both systems use 4 different wavelengths for the 4 lanes: 00GBASE-LR4/ER4 uses nm, nm, nm and nm 00GBASE-CWDM4 uses 27 nm, 29 nm, 3 nm and 33 nm DIRECT ATTACHED CABLES (DACS) AND ACTIVE OPTICAL CABLES (AOC) 40 Gbps and 00 Gbps communication devices are normally equipped with cages where transceivers can be installed. In some cases, the cables between devices are directly connected to the transceivers, which are known as Direct Attached Cables (DACs). Connections with electrical cables are normally made with DACs. DACs with optical cables and transceivers are also known as Active Optical Cables (AOC). Description Type Length See Fig. FCBN425QBC05 (AOC) Finisar 00G QSFP28 00GBASE-SR4 AOC 5 m 4 200LF (DAC) FCI Direct Attached Cable, 4 x 25Gbps qualified, AWG30 DAC m LF (DAC) FCI Direct Attached Cable, 4 x 25Gbps qualified, AWG30 DAC 3 m LF (DAC) FCI Direct Attached Cable, 4 x 25Gbps qualified, AWG26 DAC m 3 Table : 00 Gbps QSFP28 AOC and DACs available from Xena 5

6 Figure 3: 00 Gbps DAC with two electrical QSFP28 transceivers Figure 4: 00 Gbps AOC with two optical QSFP28 transceivers OPTICAL CONNECTORS Optical transceivers are equipped with connectors unless they are a part of an Active Optical Cable. Two types are normally used:. Multi-fiber connections: Multi-fiber Push-On (MPO) connectors are used. They can connect up to 2 (MPO2) or 24 (MPO24) optical fibers. For 4 lane systems 8 fibers are required (4 for the optical transmitters and 4 fibers for the optical receivers). These systems will use 8 of the 2 fiber connections in MPO2 connectors. 0 lane systems will use 20 of the 24 connections in MPO24 connectors. Multi-fiber Termination Push-on (MTP) is a brand name for an improved connector developed by US Connect; MTP connects to MPO. Figure 5: 2 fiber ends in an MPO2 connector; 24 fiber ends in an MPO24 connector 2. Single fiber connections: Transceivers and fiber cables are normally equipped with LC connectors; two fiber cables are required, one transmit, one receive. Figure 6: LC connector 6

7 BREAK OUT CABLES AND SPLITTER CABLES For some applications like connecting servers to Topof-Rack (ToR) switches in data centers, it is relevant to use the 4 25 Gbps lanes in a multi-cable connection as 4 individual 25 Gbps data streams. Hereby you can connect a 00 Gbps port in the ToR with 4 data center servers equipped with 25 Gbps ports. This is done with a DAC or AOC break out cable connecting a QSFP28 00GbE port with four independent 25GE SFP28 ports. The DAC/AOC break out cable will have a QSFP28 transceiver connected in one end breaking out to four cables, each terminated with a SFP28 transceiver. Figure 7: 00 GE to 4*25 GE break-out cable DAC and AOC break out cables are available for electrical and optical interfaces, where 40 Gbps and 00 Gbps signals are sent as 4 (or 0) physical signals. For single fiber connections break out cables are not available; splitting a WDM signal into 4 lower rate signals would require a WDM multiplexer/demultiplexer. Figure 8: 00 Gigabit/s QSFP28 to 4 x 25 Gigabit/s SFP28 DAC electrical break-out cable Figure 9: 00 Gigabit/s QSFP28 to 4 x 25 Gigabit/s SFP28 break-out Active Optical Cable (AOC) In addition to DAC and AOC break out cables, passive optical breakout cables (or splitter cables) are available splitting a 4 (or 0) lane signal into 4 (or 0) separate signals. This means for example that 4 25 Gbps optical signals from a QSFP28 optical transceiver with MPO/MTP connector can be split into 4 individual cable pairs to be connected to SFP28 optical transceivers with LC connectors as shown in figure 0. 7

8 Figure 0: MTP to 4 dual LC passive optical splitter cable cable For 0 lane multi-fiber optical transceivers with MPO24 connectors optical splitter cables can split the signal into 2 cable pairs, providing access to all 24 fibers in the MPO24 connector. Description Cable Length See type Fig. SR4-4xLC Optical splitter cable, SR4 MTP(F) <-> 4 x LC MMF 5 m 0 ism4-4xlc Optical splitter cable, ism4 MTP(F) <-> 4 x LC SMF 5 m 0 SR4-LOOP Loopback fiber cable, SR4, MTP(F) MMF SR0-2xSR4 Cassette, SR0 MTP(F) <-> 2 x QSFP receptacle, including 3 mm MMF 3 SR0 cable SR0-2xLC Optical splitter cable, SR0 MTP(F) <-> 2 x LC (Molex MMF 5 m ) SR0-LOOP Loopback fiber cable, SR0, MTP(F), MMF SR4-Trunk MTP(female) to MTP(female) 50/25/OM3, 2 Fiber Dia. 3,0mm MMF 3 m 2 SR0-Trunk MTP(female) to MTP(female) 50/25/OM3, 24 Fiber Dia. 3,8mm MMF 3 m 2 Table 2: Cables and splitters available from Xena As you can see in table 2, splitter cables are equipped with MTP (MPO) connectors. They can split signals from optical (multi-fiber) transceivers that also are equipped with MTP (MPO) connectors; they can t split signals from optical (WDM) transceivers with LC connectors. Figure : Two SR4-LOOP Loopback fiber cables Figure 2: SR4-Trunk cable 8

9 SPLITTER CASSETTE P/N SR0-2XSR4 Figure 3: Splitter Cassette for 00GBASE-SR0 (MPO) <-> 2 x 40GBASE-SR4 MPO connectors (P/N SR0-2xSR4) SR0-2xSR4 is a device equipped with one MPO24 connector and two MPO2 connectors. The MPO24 connector must be connected to a 00GBASE-SR0 transceiver with MPO24 connector through a MTP/MPO24-to-MTP/MPO24 cable (e.g. the cable SR0-Trunk available from Xena). Inside the device the MPO24 connector is connected to two MPO2 connectors using 2 x 8 fibers. The MPO2 connectors will act as two 40GBASE-SR4 (QSFP+) transceivers. MULTIPLE PORT SPEEDS IN XENA 00 G AND 40 G TEST MODULES Xena Networks 00 G and 40 G test modules can support 00 Gbps, 50 Gbps, 40 Gbps, 25 Gbps and 0 Gbps port speeds depending on test module, transceiver module and in some cases splitter cables. Tables 3 and 4 give an overview of the speeds supported by each of the Xena 00 G and 40 G test modules. Product Number Port Speed Interface Form Factor No. of Ports Type of Interface MCFP00 3 speed MQSFP28CXP 3 speed Dual-media MCFP4QSFP28CXP 3 speed Triple-media MQSFP28SFP28 5 speed Dual-media 00G (or) 0G 00G (or) 00G (or) 0G 00G (or) 00G (or) 00G (or) 0G 00G (or) 50G (or) 25G (or) 0G (or) 25G (or) 0G Table 3: Xena 00G test modules CFP 2 8 QSFP28 QSFP28/QSFP+ CXP CXP CXP CFP4 QSFP28 QSFP28/QSFP+ CXP CXP CXP QSFP28 QSFP28 QSFP28/QSFP+ QSFP28 QSFP28/QSFP+ SFP28 SFP28/SFP GBASE-SR0/LR4 40GBASE-SR4/LR4 40GBASE-SR4 0GBASE-iSR 00GBASE-SR4/LR4/CWDM4 40GBASE-SR4/LR4 00GBASE-SR0 40GBASE-iSR4 0GBASE-iSR 00GBASE-SR4/LR4 00GBASE-SR4/LR4/CWDM4 40GBASE-SR4/LR4 00GBASE-SR0 40GBASE-SR4 0GBASE-iSR 00GBASE-SR4/LR4/CWDM4/CR4 50GBASE-SR2/LR2/CR2 40GBASE-SR4/LR4/CR4 25GBASE-SR/LR/CR 0GBASE-iSR 25GBASE-SR/LR/CR 0GBASE- SR/LR/CR 9

10 Product Number Port Speed M2QSFP+ 0G M2CFP40 0G Table 4: Xena 40G test modules Interface No. of Form Factor Ports QSFP+ 2 8 CFP 2 8 Type of Interface 40GBASE-SR4/LR4/DAC 0GBASE-iSR/iSM/DAC 40GBASE-LR4 40GBASE-SR4 0GBASE-iSR For isr the i represents interoperability between the transceiver and any 0GBASE-SR compliant modules. For ism, the i represents interoperability between the transceiver and any single mode (SM) 0GBASE-LR compliant modules up to 2 km link length. To change the port speed, the user must configure the port speed and in some cases change transceiver and cables. A summary of the port speeds supported by Xena 00 G and 40G test modules together with the transceiver type required to support a given speed is shown in tables 5 to 0. Cages Port Speeds / Cable Transceiver Type Interface Options Type x CFP x 00GBASE-LR4 SMF 00GBASE-LR4 x 40GBASE-LR4 SMF 40GBASE-LR4 x 00GBASE-SR0 MMF 00GBASE-SR0 2 x 40GBASE-SR4 MMF 00GBASE-SR0 and splitter 8 x 0GBASE-SR MMF 00GBASE-SR0 and splitter Table 5: Port speeds supported by Xena MCFP00 Cages Port Speeds / Cable Transceiver Type Interface Options Type x QSFP28/QSFP+ x 00GBASE-SR0 MMF 00GBASE-SR0 x CXP 2 x 40GBASE-iSR4 MMF 00GBASE-SR0 and splitter 8 x 0GBASE-iSR MMF 00GBASE-SR0 and splitter x 00GBASE-SR4 MMF 00GBASE-SR4 x 00GBASE-LR4 SMF 00GBASE-LR4 x 00GBASE-CWDM4 SMF 00GBASE-CWDM4 x 40GBASE-SR4 MMF 40GBASE-SR4 x 40GBASE-LR4 SMF 40GBASE-LR4 Table 6: Port speeds supported by Xena MQSFP28CXP 0

11 Cages Port Speeds/ Cable Transceiver Type Interface Options Type x CFP4 x 00GBASE-SR0 MMF 00GBASE-SR0 x QSFP28/QSFP+ x 40GBASE-iSR4 MMF 00GBASE-SR0 and splitter x CXP 8 x 0GBASE-iSR MMF 00GBASE-SR0 and splitter x 00GBASE-SR4 MMF 00GBASE-SR4 x 00GBASE-LR4 SMF 00GBASE-LR4 x 00GBASE-SR4 MMF 00GBASE-SR4 x 00GBASE-LR4 SMF 00GBASE-LR4 x 40GBASE-SR4 MMF 40GBASE-SR4 x 40GBASE-LR4 SMF 40GBASE-LR4 Table 7: Port speeds supported by Xena MCFP4QSFP28CXP Cages Port Speeds/ Cable Transceiver Type Interface Options Type x QSFP28/QSFP+ x 00GBASE-SR4 MMF 00GBASE-SR4 2 x SFP28/SFP+ x 00GBASE-LR4 SMF 00GBASE-LR4 x 00GBASE-CWDM4 SMF 00GBASE-CWDM4 x 00GBASE-CR4 Copper 00GBASE-CR4 (DAC) 2 x 50GBASE-SR2 MMF 00GBASE-SR4 and splitter 2 x 50GBASE-LR2 SMF 00GBASE-LR4 PSM4 and splitter 2 x 50GBASE-CR2 Copper 00GBASE-CR4 (DAC with break-out) 4 x 25GBASE-SR MMF 00GBASE-SR4 and splitter 4 x 25GBASE-LR SMF 00GBASE-LR4 PSM4 and splitter 4 x 25GBASE-CR Copper 00GBASE-CR4 (DAC with break-out) x 40GBASE-SR4 MMF 40GBASE-SR4 x 40GBASE-LR4 SMF 40GBASE-LR4 x 40GBASE-CR4 Copper 40GBASE-CR4 4 x 0GBASE-iSR MMF 40GBASE-SR4 and splitter 2 x 25GBASE-SR MMF 25GBASE-SR 2 x 25GBASE-LR SMF 25GBASE-LR 2 x 25GBASE-CR Copper 25GBASE-CR (DAC) 2 x 0GBASE-SR MMF 0GBASE-SR 2 x 0GBASE-LR SMF 0GBASE-LR 2 x 0GBASE-CR Copper 0GBASE-CR Table 8: Port speeds supported by Xena MQSFP28SFP28

12 Cages Port Speeds/ Interface Options Cable Type 2 x QSFP+ 2 x 40GBASE-LR4 SMF 40GBASE-LR4 2 x 40GBASE-SR4 MMF 40GBASE-SR4 8 x 0GBASE-iSR MMF 40GBASE-SR4 with splitter 8 x 0GBASE-iSM SMF 4x0GBASE-LR4 PSM4 with splitter Table 9: Port speeds supported by Xena M2QSFP+ Cages Port Speeds/ Cable Transceiver Type Interface Options Type x CFP x 40GBASE-LR4 SMF 40GBASE-LR4 2 x 40GBASE-SR4 MMF Dual 40GBASE-SR4 8 x 0GBASE-SR MMF Dual 40GBASE-SR4 with splitter Table 0: Port speeds supported by Xena M2CFP40 00 Gbps LR4 Excelight (Sumitomo) SCF000L4 00 Gbps SR0 Reflex Photonics CF-X2 00 Gbps SR0 Finisar FTLC828SCNM Excelight (Sumitomo) 00G CFP4 00GBASE-LR4 Innolight 00G QSFP28 00GBASE- LR4 Finisar 00G CXP 00GBASE- SR0 Figure 4: Examples of transceivers available from Xena 2

13 P/Ns Description Wave length Connector Reach Cable type 00 Gbps CFP CF-X2 (SR0) Reflex Photonics 00G CFP 00GBASE-SR0 850 nm MPO 00 m MMF FTLC828SCNM (SR0) Finisar 00G CFP 00GBASE-SR0 850 nm MPO 00 m MMF FTLC82R (LR4) Finisar 00G CFP 00GBASE-LR4 30 nm LC 0 km SMF SCF00-L4 (LR4) Excelight (Sumitomo) 00G CFP 00GBASE-LR4 30 nm LC 0 km SMF 00 Gbps CFP4 SFF400L4LNGG0B (LR4) Excelight (Sumitomo) 00G CFP4 00GBASE- LR4 30 nm LC 0 km SMF FTLC94RENM (SR4) Finisar 00G CFP4 00GBASE-SR4 850 nm MPO 00 m MMF FTLC4RDNL (LR4) Finisar 00G CFP4 00GBASE-LR4 30 nm LC 0 km SMF 00 Gbps QSFP28 TR-FC85S Innolight 00G QSFP28 00GBASE-SR4 850 nm MPO 00 m MMF TR-FC3L Innolight 00G QSFP28 00GBASE-LR4 30 nm LC 0 km SMF 00 Gbps CXP FTLD0CEC Finisar 00G CXP 00GBASE-SR0 850 nm MPO 00 m MMF 40 Gbps CFP CF-X08 (2 x SR4) Reflex Photonics 2x40G CFP Dual 40GBASE-SR4 850 nm MPOx2 00 m MMF CF-X04 (SR4) Reflex Photonics 40G CFP 40GBASE-SR4 850 nm MPO 00 m MMF FTLQ88EBLM (SR4) Finisar 40G CFP 40GBASE-SR4 850 nm MPO 00 m MMF 40 Gbps QSFP+ AFBR-79EIDZ Avago 40G QSFP+ 40GBASE-SR4 850 nm MPO 00 m MMF AFCT-88EEPZ Avago 40G QSFP+ 40GBASE-LR4 30 nm LC 0 km SMF FTL40QE2C Finisar 40G QSFP+ 40GBASE-SR4 850 nm MPO 00 m MMF FTL4CQEC Finisar 40G QSFP+ 40GBASE-LR4 30 nm LC 0 km SMF TR-IQ3L Innolight 4x0G QSFP+ 4x0GBASE-LR4 Parallel Single Mode (PSM) 30 nm MPO 0 km SMF 0 Gbps XFP SXP300SX Excelight (Sumitomo) 0G XFP 0GBASE-SR 850 nm LC 300 m MMF SXP300LX Excelight (Sumitomo) 0G XFP 0GBASE-LR 30 nm LC 0 km SMF SXP300EX-M Excelight (Sumitomo) 0G XFP 0GBASE-ER 550 nm LC 40 km SMF 0 Gbps SFP+ FTLX8573D3BT Finisar 0G SFP+ 0GBASE-SR 850 nm LC 300 m MMF SPP5300LR-GL Excelight (Sumitomo) 0G SFP+ 0GBASE-LR 30 nm LC 0 km SMF SPP500ER-GL Excelight (Sumitomo) 0G SFP+ 0GBASE-ER 550 nm LC 40 km SMF Table : 00G to 0G transceivers available from Xena 3

14 Connector MQSFP28SFP28 MCFP4QSFP28CXP MQSFP28CXP MCFP00 M2CFP40 M2QSFP+ M2QSFP0 SR4-4xLC ism4-4xlc SR4-LOOP SR0-2xSR4 SR0-2xLC SR0-LOOP SR4-Trunk SR0-Trunk APPLICATION NOTE WHAT GOES WHERE? Table 2 and 3 shows how transceivers available from Xena can be used with Xena 00 G and 40 G test modules and with cables and splitters. Xena Test Modules Cables and splitters 00 Gbps CFP CF-X2 (SR0) MPO FTLC828SCNM (SR0) MPO FTLC82R (LR4) LC SCF00-L4 (LR4) LC 00 Gbps CFP4 SFF400L4LNGG0B (LR4) LC FTLC94RENM (SR4) MPO FTLC4RDNL (LR4) LC 00 Gbps QSFP28 TR-FC85S (SR4) MPO TR-FC3L (LR4) LC 00 Gbps CXP FTLD0CEC (SR0) MPO 40 Gbps CFP CF-X08 (2 x SR4) MPOx2 CF-X04 (SR4) MPO FTLQ88EBLM (SR4) MPO Table 2: Transceivers, Xena 00/40 G test modules, cables and splitters 4

15 Connector MQSFP28SFP28 MCFP4QSFP28CXP MQSFP28CXP MCFP00 M2CFP40 M2QSFP+ M2QSFP0 SR4-4xLC ism4-4xlc SR4-LOOP SR0-2xSR4 SR0-2xLC SR0-LOOP SR4-Trunk SR0-Trunk APPLICATION NOTE Xena Test Modules Cables and splitters 40 Gbps QSFP+ AFBR-79EIDZ (SR4) MPO AFCT-88EEPZ (LR4) LC FTL40QE2C (SR4) MPO FTL4CQEC (LR4) LC TR-IQ3L (LR4) MPO 0 Gbps SFP+ FTLX8573D3BT LC SPP5300LR-GL LC SPP500ER-GL LC 00 Gbps QSFP28 AOCs and DACs FCBN425QBC05 (AOC) 200LF (DAC) 2030LF (DAC) 4050LF (DAC) Table 3: Transceivers, Xena 00/40 G test modules, cables and splitters CONFIGURING XENA 00 G AND 40 G TEST MODULES The first step in configuring the Xena 00 G and 40 G test modules is to select and reserve the test module in XenaManager-2G. In the example in this section the module used is the tri-media test module MCFP4QSFP28CXP, which supports CFP4, QSFP28 and CXP transceivers. Select the module in the XenaManager-2G Testbed explorer window, right-click on it and Reserve Module. 5

16 Figure 5: Reserve module Select the Resource Properties tab; you will now see the module properties. Next step is to select the media to be used for the test; in the example CXP is selected from the drop-down menu. Figure 6: Select Media configuration Finally, the speeds to be used for the test needs to be selected; in this case 2 x 40G is selected from the port configuration drop-down menu. 6

17 Figure 7: Select port configuration In the XenaManager-2G Testbed explorer window, you now see two 40GBASE-SR4 test ports as shown in figure 8. Figure 8: Two 40GBASE-SR4 test ports in the XenaManager-2G Testbed explorer window You can now reserve and configure the 40 Gbps ports as required. When the tester is configured to operate in 2 x 40 Gbps port speed mode, the Xena tester operate as two fully independent 40 Gbps ports, corresponding to the two logical test ports shown in figure 8. By using an optical splitter like the SR0-2xSR4 splitter cassette, the two 40 Gbps Ethernet interfaces can be made available through two standard 40 Gbps MPO2 connectors. The MPO2 connectors will act as two 40GBASE-SR4 (QSFP+) transceivers. 7

18 Figure 9: Change speed selection to 8 x 0G You can also make the CXP transceiver in the MCFP4QSFP28CXP test module act as 8 independent 0 Gbps ports. To do that, the speed setting in the must be changed to 8 x 0G in the Module Properties (see figure 9). The XenaManager-2G Testbed explorer window will change in accordance with the new setting. Figure 20: Eight 0GBASE-iSR4 test ports in the XenaManager-2G Testbed explorer window You can now reserve and configure the 0 Gbps ports as required. 8

19 To make the eight 0 Gbps test ports physically available you can use the SR0-2xSR4 splitter cassette mentioned above and connect two optical splitter cables (SR4 MTP(F) <-> 4 x LC). As an alternative, you can use an optical splitter cable (SR0 MTP(F)<-> 2 x LC) connected directly to the MPO/MTP connector on the CXP transceiver. SR0 <-> 2 X LC MMF SPLITTER CABLE When using the SR0 <-> 2 x LC MMF splitter cable, the 8 x 0 Gbps test ports are mapped to the 2 LC connectors as illustrated in table 4. Table 4 also shows how 2 x 40 Gbps test ports will be mapped to the 2 LC connectors. In both cases, all the eight 0 Gbps ports must be connected to the device under test. If the DUT has less than eight 0 Gbps ports, the redundant 0 Gbps ports must be connected with optical loop cables, or connected port-to-port using a LC-assembly link between the ports. Test Ports Cable LC Numbering scheme: Cable LC Numbering scheme: 40G 0G # - #2 #0 - #9, #A, #B 0 Cable LC #2 Cable LC #0 0 Cable LC #3 Cable LC # 2 Cable LC #4 Cable LC #2 3 Cable LC #5 Cable LC #3 4 Cable LC #7 Cable LC #5 5 Cable LC #8 Cable LC #6 6 Cable LC #9 Cable LC #7 7 Cable LC #0 Cable LC #8 Comment: Cable LC #, #6, #, #2 are not connected (unused) Cable LC #4, #9, #A, #B are not connected (unused) Table 4: SR0 -> 2 x LC MMF cable port mapping SR4 <-> 4 X LC AND ISM4 <-> 4 X LC SPLITTER CABLES When using the SR4 <-> 4 x LC and ism4 <-> 4 x LC splitter cables, the labels on the LC end of the cables will show the number of the related test port. 9