Tag Archives: 100GBase-SR10

40 GbE and 100 GbE over Multimode Fiber

To support the changing and fast-growing bandwidth demands of data centers, the IEEE ratified standards for supporting 40 GbE (Gigabit Ethernet) and 100 GbE (Gigabit Ethernet), known as IEEE 802.3ba. Both 40 and 100 GbE can be deployed using the same cabling systems in use today. Multimode will employ parallel optics using MPO interconnects and require additional cable infrastructure depending on the system deployed while single mode fiber will employ serial transmission and use LC or SC connectors. Each has its own advantages and disadvantages. In this post, 40 GbE and 100 GbE over multimode fiber will be introduced.

40 GbE and 100 GbE Standard

IEEE published the IEEE 802.3ba standard for 40 Gigabit and 100 Gigabit Ethernet in June 2010. multimode optical fiber OM1, OM2, OM3 and OM4 have different capabilities of supporting different Ethernet applications. Only the laser optimized multimode fiber (grades OM3 and OM4) are capable of supporting 40G and 100G Ethernet. The next part will focus on the cabling requirements of 40 GbE and 100 GbE over multimode fiber. The table below shows 40GE and 100GE specifications.

40 GbE and 100 GbE Specifications

Implementing Parallel Optics

Traditionally, the Ethernet standard has relied upon duplex fiber cabling with each channel using one fiber to transmit and the other to receive. However, the 802.3ab standard requires multiple lanes of traffic per channel. To do this, the 40/100GbE standard uses parallel optics. The 802.3ba standard defines the parallel operation of four OM3/OM4 fibers for 40 GbE in 40GBASE-SR4 and the parallel operation of ten OM3/OM4 fibers for 100 GbE in 100GBASESR10. Two fibers have to be used per link because this arrangement is full duplex operation, i.e. simultaneous transmission in both directions. Therefore the number of fibers increases to eight for 40GBASE-SR4 and to 20 for 100GBASE-SR10. In the parallel optical link, the signal is split, transmitted over separate fibers and then joined again. That means the individual signals have to arrive at the receiver at the same time. Any skew in signal components has to be kept within tight tolerances. Trunk cables preterminated with MPO/MTP connectors are therefore the best choice for reliable transmission.

What Is 40 GbE and 100GbE over Multimode Fiber?

40G Ethernet and 100G Ethernet over multimode fiber uses parallel optics at 10 Gb/s per lane. One lane uses 1 fiber for each direction of transmission. 40G Ethernet requires 8 fibers. 100G Ethernet requires 20 fibers. The minimum performance that is needed to support 40 GbE and 100 GbE over multimode fiber is OM3 fiber for a distance of 100 meters. Cabling with OM4 fiber provides the capability to extend the reach up to 150 meters. Parallel optical channels with multi-fiber multimode optical fibers of the categories OM3 and OM4 are used for implementing 40 GbE and 100 GbE. The small diameter of the optical fibers poses no problems in laying the lines, and 802.3ba standard incorporated the MPO multi-fiber connector for 40GBASE-SR4 and 100GBASE-SR10, which can contact 12 or 24 fibers in the tiniest of spaces.

Conclusion

Optical fiber cabling is commonly deployed for backbone cabling in data centers for switch to switch connections and also for horizontal cabling for switch to server and storage area network connections. The use of pre-terminated optical fiber cabling can facilitate the migration path to 40G and 100G Ethernet in the future. Fiberstore can supply you with top-quality components for your 40 GbE and 100 GbE network, like 40G QSFP transceivers, and all kinds of QSFP+ cable choices, it also assists you competently with all questions involving planning, installation and maintenance.

Upgrading to 40/100 Gigabit Ethernet

To support the changing and fast-growing bandwidth demands of data centers (DCs), the IEEE ratified standards for supporting 40 Gigabit Ethernet (40GE) and 100 Gigabit Ethernet (100GE), known as IEEE 802.3ba. 40GE and 100 GE belong to a family of network technologies that primarily are used in local area networks. As they are becoming more and more popular, it is very necessary to know more about them. This post offers a quick-reference guide to increase your familiarity with issues in the migration to 40 and 100GE systems.

Cabling Systems

Both 40 and 100 Gigabit Ethernet can be deployed using the same cabling systems in use today. Multi-mode will employ parallel optics using MPO interconnects and require additional cable infrastructure depending on the system deployed while single mode fiber will employ serial transmission and use LC or SC connectors. The approach used for the higher speed data rates is based on advanced transceiver technologies engineered to take advantage of the full bandwidth of laser optimized fibers. Both single mode fiber (SMF) and multi-mode fiber (OM3, OM4) were approved in the standard.

Standards
  • 40GBase-SR4: multimode fiber with four fiber pairs (OM3/OM4)
  • 40GBase-LR4: single-mode fiber pairs with 4 wavelengths a 10Gbit/s at 10 km
  • 40GBase-KR4: short distances in the backplane (4 pairs of wires)
  • 40GBase-CR4: twinax cable with 4 pairs
  • 100GBase-CR10: twinax cable with 10 pairs
  • 100GBase-SR10: multimode fiber with 10 fiber pairs (OM3/OM4)
  • 100GBase-SR10: single-mode fiber pairs with 4 wavelengths a 25Gbit/s at 10 km
  • 100GBase-ER4: single-mode fiber pairs with 4 wavelengths a 25Gbit/s at 40 km
Module Types

QSFP: The QSFP (quad small-form-factor pluggable) is the primary way of delivering 40GE and are now appearing in 100GbE-capable form. These present either MPO connectors for multi-mode optics or LC connectors for single-mode optics. It is similar in size to the CXP and provides four transmit and four receive lanes to support 40GbE applications. QSFP+ (quad small form-factor pluggable plus), as the updated version of QSFP, is a new multi-source agreement (MSA) for high speed application. QSFP+ gradually replace QSFP and is widely used by people as it can provide higher bandwidth. The following picture shows an Avaya AA1404001-E6 compatible QSFP+ transceiver.

Avaya AA1404001-E6 Compatible 40GBASE-LR4 QSFP+ Transceiver

CFP: The CFP (C form-factor pluggable) transceiver features twelve transmit and twelve receive 10Gb/s lanes to support one 100GbE port, or up to three 40GbE ports. CFP form factor optics are available in 40GbE and 100GbE varieties. Its larger size is suitable for the needs of single-mode optics and can easily serve multi-mode optics or copper as well. These present MPO connectors for multi-mode optics or SC connectors for single-mode optics. CFP modules use the 10-lane CAUI-10 electrical interface.

CFP2: The CFP2 is an evolution of the existing CFP form factor, using manufacturing and optics advances to reduce the size of the module to approximately half that of the original CFP, allowing for higher interface density. CFP2 modules use the 10-lane CAUI-10 electrical interface or the 4-lane CAUI-4 electrical interface.

Requirements and Objectives

40GE and 100GE fulfill the following requirements and objectives:

  • Preserve existing 802.3 frame format, minimum size, and maximum size.
  • Support high-speed switching, routing, and application functions in data centers.
  • Exhibit a bit error rate (BER) of 10-12 or better.
  • Provide support for optical transport network (OTN).
  • Provide specifications for operation over single-mode optical fiber, laser optimized multimode optical fiber, copper cables, and backplanes.
  • Support high-bandwidth applications such as video on demand (VoD) and high-performance computing (HPC).

The throughput and reliability of a 40/100 Gigabit Ethernet installation is directly related to the cabling, the choice of connectivity, and proper installation. Fiberstore’s superior cable and connectivity designs provides you with superior levels of performance and operation. We offer all kinds of cables and transceiver modules for your applications, such as Dell Force10 GP-QSFP-40GE-1SR 40GBASE-SR4 QSFP+ transceiver, or Juniper QFX-QSFP-DAC-3M compatible QSFP+ to QSFP+ passive copper cable, and so on. You can buy from us with confidence.