Question: How many mandatory transmitters of the Canadian Broadcasting Centre's owner were updated before the deadline?

Knowledge 1: African Guitar Summit
The nine musicians rehearsed and arranged for three days, sharing stories and experiences. On the fourth day the group debuted in a concert at CBC's Glenn Gould Studio. The following three days were spent in CBC Studio 211 recording their self-titled CD. Everything was recorded live off the floor, in one or two takes. [SEP] Knowledge 2: CBC Television
On August 18, 2011, the CRTC issued a decision that allows CBC's mandatory market rebroadcasting transmitters in analogue to remain on-air until August 31, 2012. Before that deadline, CBC's licence renewal process would take place and CBC's digital transition plans would be examined as part of that process. The requirement remains for all of CBC's full-power transmitters occupying channels 52 to 69 to either relocate to channels 2 to 51 or become low-power transmitters. In some cases, CBC has opted to reduce the power of existing transmitters to low-power transmitters, which will result in signal loss for some viewers.
Knowledge 1: African Guitar Summit
The nine musicians rehearsed and arranged for three days, sharing stories and experiences. On the fourth day the group debuted in a concert at CBC's Glenn Gould Studio. The following three days were spent in CBC Studio 211 recording their self-titled CD. Everything was recorded live off the floor, in one or two takes. [SEP] Knowledge 2: CBC Television
While its fellow Canadian broadcasters converted most of their transmitters to digital by the Canadian digital television transition deadline of August 31, 2011, CBC converted only about half of the analogue transmitters in mandatory areas to digital (15 of 28 markets with CBC Television stations, and 14 of 28 markets with Télévision de Radio-Canada stations). Due to financial difficulties reported by the corporation, the corporation published digital transition plans for none of its analogue retransmitters in mandatory markets to be converted to digital by the deadline. Under this plan, communities that receive analogue signals by rebroadcast transmitters in mandatory markets would lose their over-the-air signals as of the deadline. Rebroadcast transmitters account for 23 of the 48 CBC and Radio-Canada transmitters in mandatory markets. Mandatory markets losing both CBC and Radio-Canada over-the-air signals include London, Ontario (metropolitan area population 457,000) and Saskatoon, Saskatchewan (metro area population 257,000). In both of those markets, the corporation's television transmitters are the only ones that were not planned to be converted to digital by the deadline.
Knowledge 1: CBC Television
While its fellow Canadian broadcasters converted most of their transmitters to digital by the Canadian digital television transition deadline of August 31, 2011, CBC converted only about half of the analogue transmitters in mandatory areas to digital (15 of 28 markets with CBC Television stations, and 14 of 28 markets with Télévision de Radio-Canada stations). Due to financial difficulties reported by the corporation, the corporation published digital transition plans for none of its analogue retransmitters in mandatory markets to be converted to digital by the deadline. Under this plan, communities that receive analogue signals by rebroadcast transmitters in mandatory markets would lose their over-the-air signals as of the deadline. Rebroadcast transmitters account for 23 of the 48 CBC and Radio-Canada transmitters in mandatory markets. Mandatory markets losing both CBC and Radio-Canada over-the-air signals include London, Ontario (metropolitan area population 457,000) and Saskatoon, Saskatchewan (metro area population 257,000). In both of those markets, the corporation's television transmitters are the only ones that were not planned to be converted to digital by the deadline. [SEP] Knowledge 2: CHRW-FM
CHRW-FM is a Canadian radio station, broadcasting at 94.9 FM in London, Ontario. It is licensed as a community-based campus radio station by the Canadian Radio-television and Telecommunications Commission. The station broadcasts from Room 250 of the University Community Centre of the University of Western Ontario.

Answer: only about half