codes are typically used to identify building locations, such as central office buildings. The first six characters are the city (four letters) and province/state (two letters). Each territory is normally identified using its two-letter ISO 3166-2:CA or ISO 3166-2:US postal abbreviation suffix (with exceptions: Newfoundland and Labrador as NF, Québec as PQ and Nunavut written as VU). The seventh and eighth characters in this format are known as the Network Site code element and denote the specific location or building address. These will be either two letters or two numbers; a X followed by a letter identifies a local independent telephone company building. Network Entity Code Format CLLI codes in the Network Entity format are the most commonly used CLLI codes. Network Entity codes are eleven-character codes used to describe the location and function of network equipment. The first eight characters are the city, province/state and network site location (see Network Site Code Format, above). The ninth, tenth and eleventh characters of a Network Entity code specify a particular type of equipment function at a Network Site location. Three-letter entity codes often begin with two letters to identify combinations of switching equipment such as MG (crossbar exchange - marker group), SG (step-by-step exchange - step group), CG (electronic switching system - control group), DS (digital switch), CT (concentrator) or RS (remote switcher). Non-switching entity codes may begin with A (administrative office space and computers), E (exchange switchroom), F (frame), K (software cross-connectable entity), M (maintenance group), P (test/service position), Q (radio tower), S (service centre), T (toll test) or W (miscellaneous), followed by anything except G (to avoid conflict with switches). Reserved final (eleventh) characters include B ('board' - operator and switchboard positions including '0' and '4-1-1'), D (various termination entities, including mobile or CLEC exchanges, hosted Centrex, 9-1-1 dispatch, time/weather and pre-recorded announcements), T (tandem), I, O, U, W or Y (not used). The specific type of board or termination entity is specified by the tenth character. Network Support Site Code Format A Network Support Site code represents any non-building structures or outside plant equipment such as Wireless Access Points, International Boundary Crossing Points, End-Points, Fiber Nodes, Junctions, Manholes, Poles, Base Transceiver Station / Radio Equipment and Repeaters. This format contains 6 characters representing location and a 5-character Network Support Site Code element. The first six characters are the city (four letters) and province/state (two letters) The seventh character