{"version":"1.0","type":"link","title":"Synchronous Digital Hierarchy - Newikis","description":"Synchronous Digital Hierarchy (SDH) on CCITT:n (nyk. ITU-T) standardi optiselle tiedonsiirrolle. Synchronous Optical Network (SONET) on yhdysvaltalainen vastaava standardi.","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}