From its first appearance, SOC (Security Operations Center) was created for MSS (Managed Security Services). At 2002, when I tried to dig information on SOC with Google for the first similar project at China, I found the top matches came from ISS and its subsidiary organizations (ISS had 6 SOCs worldwide then), such as ISSKK, and its Taiwan agent – ISSTW.
,but this was not my target.
Another significant description of SOC is from NTT. NTT built up its SOC to provide MSS service to their customers! ie. Security can be sort of value-added service, besides being competitive advantages. See the following diagram on NTT's SOC: Read the rest of this entry »
Posted by Richard 
Telecom, Security and P2P 