Telecom industry is in the best times in that new products and technologies keeping coming out, which greatly facilitate people’s daily lives. From the 10GbE, 40GbE to the 100GbE, users can be benefited from the varieties of Gigabit Ethernet applications. Pluggable from factor (SFP+, QSFP+, CFP) used in different Gigabit Ethernet that can support the multimode fibers (MM) leads to lower costs and low power consumption. By comparison of single-mode modules, MM optical transceivers enable a single build standard for short-reach connection in data centers. Today’s article will briefly illustrate the multimode cabling upgrade in 10G, 40G and 100G Ethernet.
10GBASE-SR, 40GBASE-SR4, 100GBASE-SR10 Wiki
According to Wikipedia, there are similarities and differences between the three standards. Let’s have a quick overview of it.
10GBASE-SR (short range) is a port type for multi-mode fiber (OM3 and OM4) and uses 850 nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 49 and its Physical Medium Dependent PMD in Clause 52. It delivers serialized data at a line rate of 10.3125 Gbit/s. The 10GBASE-SR transmitter is implemented with a VCSEL which is low cost and low power. 10GBASE-SR delivers the lowest cost, lowest power and smallest form factor optical modules with a link length of 300m over OM3, and 400M over OM4.
40GBASE-SR4 is a port type for multimode fiber and uses 850 nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 82 and its Physical Medium Dependent PMD in Clause 86. It uses four lanes of multimode fiber delivering serialized data at a rate of 10.3125 Gbit/s per lane. 40GBASE-SR4 has a reach of 100 m on OM3 and 150m on OM4.
The IEEE P802.3ba Task Force developed a single architecture capable of supporting both 40bE and 100GbE. 100GBASE-SR10, which is defined as 10 wavelengths across 10 parallel fiber paths at 10Gbps on multimode fiber (operating at 850 nm). Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 86 (802.3ba). It uses ten lanes of multimode fiber delivering serialized data at a rate of 10.3125 Gbit/s per lane. 40GBASE-SR4 has a reach of 100 m on OM3 and 150m on OM4.
40 GbE links are re-used in this diagram, and require additional MTP/MTP trunk to complete channel, fibers 1 and 12 go dark.
10GBASE-SR, 40GBASE-SR4, 100GBASE-SR10 in Different Form Factors
- 10GBASE-SR SFP+
10GBASE-SR optical transceivers use 10G SFP+ form factor with duplex LC connector. The range of this module depends on the type of multimode used. It generally supports a link length of 26 meters on standard Fiber Distributed Data Interface (FDDI)-grade multimode fiber and can also support link length up to 400 meters over OM4 multimode fiber. The following image shows the simplest solution between two Cisco switches by using the 10GBASE-SR SFP+ optics.
- 40GBASE-SR4 QSFP+
The 40GBASE-SR4 optical transceiver is QSFP+ form factor, primarily enabling high-bandwidth 40GbE optical links over 12-fiber parallel terminated with MPO/MTP multifiber female connectors. In general, it can support link lengths of 100 and 150 meters, respectively on OM3 and OM4 multimode fibers. In addition, using 12-fiber MPO/MTP to 6 duplex LC or 8-fiber MPO/MTP to 4 duplex LC breakout cable, the 40GBASE-SR4 interface can be divided into four 10GBASE-SR interfaces.
- 100GBASE-SR10 CFP
CFP is the typical representative form factor of 100GBASE-SR10. The 10GBASE-SR10 CFP uses 24-fiber MPO/MTP optical interface, enabling high-bandwidth 100GbE links over 24-fiber ribbon cables terminated with MPO/MTP-24 connectors. Alternatively, 2 x 12-fiber MPO connector interface can be used where one connector is used for Receive while the other for Transmit. The 100GBASE-SR10 CFP can supports link lengths of 100 meters and 150 meters respectively on laser-optimized OM3 and OM4 multifiber cables. Additionally, it can be used in 10 x 10GbE mode along with ribbon to duplex fiber breakout cables for connectivity to ten 10GBASE-SR optical interfaces.
This article concludes the features of multimode cabling upgrade from 10G to 100G. multimode modules together with its lower price tag and low power consumption, are compelling to overall users. FS.COM, as a reliable fiber optic transceiver module suppliers, offers a full range of hot-selling fiber optics like SFP, SFP+, QSFP+, QSFP28 and CFP modules.