Latin America. Today's world requires faster data transmission, and that need is driving big changes in Ethernet speeds in data centers. Hyperscale data centers are deploying 100 Gigabit Ethernet (GbE) with the expectation of migrating to 200 and 400 GbE in a few years. However, in enterprise Data Centers things move more slowly: recently 10GbE has become a stream, but given the accelerated evolution in speeds, it is doubtful that this will last 5 or 10 years, so you will see a rapid change to 25GbE and 100GbE.
"Moving to faster Ethernet involves changes in the way fiber is used and how data is transmitted," said Jarred Baker, Data Center Solution Architect at CommScope. "Networks are moving from multi-tier designs to spine-leaf architectures to deliver fault-tolerant, low-latency services to users, increasing data transmission rates between devices, improving service delivery."
To enable higher speeds, data center architects have changed the way signals are transmitted from 10GbE duplex transmission to parallel transmission that supports up to 40 and 100GbE using 25GbE cabling with eight fibers. Replacing 10GbE with 25GbE offers a way to reach 100GbE using four fiber pairs, which is easier to manage from one connection and cabling point. Thus, 4x25GbE links allow faster applications, which produces lower costs and higher density of network equipment than with 4x10GbE interfaces.
How to increase speed to data center requirements?
Traditional enterprise data centers typically use 10GbE links and uplinks are 40GbE or 100GbE, however, many medium and large enterprises are considering ways to make 100GbE more efficient by switching servers to 25GbE.
"Similarly, enterprises are evolving from OM4 to OM5 (Multimode Broadband Fiber), allowing them to have four times the bandwidth of a pair of fibers. For example, a single pair of fibers can supply 40GbE or 100GbE instead of requiring eight fibers. OM5 fiber enables this shortwave division multiplexing (SWDM) with surface lasers that emits less expensive surfaces (VCSELs)," added Jarred Baker.
Multitenant Data Centers (MTDCs) are another application. WAN connectivity to individual client cages requires large single-mode extension links. Therefore, although multimode links are less expensive, they cannot support the distance and speed requirements for this scenario. In these cases, TDCs carry the single-mode fibers into the space of the individual tenants and use the multimode fiber inside the cages. In this way, the infrastructure designs that serve customers in their data centers are replicated in the environments within the cages they rent from the MTDC.
Transition strategies
For organizations considering a new "short-range" design, multimode fiber will continue to provide flexibility, energy efficiency, and several generations of data rate increases, even providing duplex and parallel options for adjusting distance and capital budgets. But for the Data Center Solution Architect, the first recommendation is to focus on the lower initial cost duplex design:
"Doing this allows organizations to leverage today's duplex applications in 10GbE and 25GbE, with the ability to go parallel to where needed in the spine or core. Starting with these types of designs also allows users to move from duplex to parallel and back to duplex without a penalty to regain the use of fiber ports as data speeds increase."
With the recent standardization of OM5 Broadband Multimode Fiber, the value of a multimode infrastructure for short distances has increased considerably. OM5 offers the ability to support the same legacy short-wavelength applications as OM3 and OM4 and, in many cases, extends the bearable distances as well as the design flexibility of the Data Center cabling architecture.
As data centers move at higher speeds, the fiber count can get out of the hands of operators if you use the same parallel design that stands out from initial 10GbE deployments. "For this reason, starting with duplex designs and employing single-mode fiber and OM5 multimode fiber, data center operators can easily move to high-speed Ethernet standards, while efficiently utilizing the space and cabling they already have," said Jarred Baker, Data Center Solution Architect at CommScope.
