P AR T I ●  Advertising. We are committed to further strengthening the Chunghwa Telecom brand and image as well as strengthening and  expanding market recognition of our specialized product brands, such as HiNet and emome. We plan to leverage our leading  market position and status to strengthen the overall advantage of our product brands.  Our marketing department at our corporate headquarters in Taipei is responsible for central business planning and formulating  our marketing strategies and objectives. We have multiple marketing departments for our various businesses which are responsible  for business and marketing planning.  We also have 17 operations offices, 326 service centers and 223 exclusive service stores located throughout Taiwan that are  responsible for operations, sales and customer service in their respective local areas.  We believe our reputation for quality customer service has helped us attract new customers and maintain customer loyalty.  We regularly survey our customers to improve our service and better understand market demand and customer preferences, and seek  to develop products and services accordingly.  We provide the following services to our customers:  Sales and Distribution  Customer Service and Billing  ●  24-hour customer service and technical support through our service centers, call centers and website;  ●  English billing documents available upon request;  ●  free of charge itemized billing for international and domestic long distance calls;  ●  bill payment services at 24-hour convenience stores, bank service counters, automatic teller machines, and service centers  throughout Taiwan, via direct debit, over the phone, online at our website (www.cht.com.tw), on MOD, and on mobile  handset emome or Hami;  ●  online information and bill payment services at our website (www.cht.com.tw) and customer service hotline for telephone  payment; and  ●  consolidated and automated billing for all services.  Our network infrastructure consists of transmission networks that convey voice and data traffic, switching networks that route  traffic between networks, and mobile, internet, leased line and data switching networks.  We purchase most of our network equipment from well-known international suppliers. As part of the purchase contract, these  suppliers deliver and install the equipment for us. We also purchase from local suppliers a variety of components such as transmission  lines, switches, telephone sets, MOD set-top boxes, and radio transmitters.  Approximately 13,959 of our employees were engaged in network infrastructure development, maintenance, operation and  planning as of December 31, 2011.  Network Infrastructure  Internet Protocol Broadband Backbone Network  Our internet protocol broadband backbone network consists of an inner core network and an outer core network.  We completed the construction of our high-speed internet protocol backbone network at the end of 2011 with 16 sets of 4.5  Tbps/2.5Tbps/1.6 Tbps/1.2 Tbps/640 Gbps switch routers for the inner core network and more than 50 sets of 1.2Tbps /640 Gbps/320  42