Signals Intelligence Directorate
The Signals Intelligence Directorate is a joint service organisation, manned by personnel from the Army, Navy and Air Force. It has a large number of WEUs (Wireless Experimental Units) that carry out the task of monitoring military links of other countries.
The Central Monitoring Organisation (CMO) is directly under the Ministry of Defence. It has several monitoring companies, located at different locations around the country. Task is to monitor use of radio spectrum by all users, such as Defence, Police, AIR, Railways, PSUs etc.
Read more about this topic: List Of Indian Intelligence Agencies
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