Optical Switching in Next Generation Data Centers by Francesco Testa & Lorenzo Pavesi

Author:Francesco Testa & Lorenzo Pavesi
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

9.2 Hybrid OPS/EPS

A hybrid of OPS/EPS is required to address the switching during IPG as well as a proper photonic framing for receiver clock recovery. As we discuss below, these challenges can be addressed by accelerating the photonic line rate by at least 10% faster than the native rate and equipping photonic frames with a long preamble sequence for frame recovery.

An example of photonic-based hybrid OPS/EPS datacenter architecture is illustrated in Fig. 9.1. It features N servers, M top-of-rack (TOR) switches, P aggregation nodes each enhanced by new functions, a PxP switch OPS, and a tandem EPS of the same size but lower capacity. The connectivity architecture shown is a three-tier hierarchy with N servers connected to a TOR, M TORs interconnected by an aggregation node, and P aggregation nodes interconnected by the core hybrid OPS/EPS. Assuming N = 48, M = 32, and P = 32, the total number of servers is approximately 50,000. A two-tier architecture is possible by including the enhanced functions of aggregation nodes into the TORs or edge switches.

Fig. 9.1Structure of a hybrid OPS/EPS datacenter network

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