tokens: ['The', 'NML', 'has', 'the', 'responsibility', 'for', 'the', 'management', 'of', 'a', 'network', 'as', 'supported', 'by', 'the', 'EML', 'includes', 'the', 'management', 'aspects', 'of', 'any', 'management', 'entity', 'which', 'implements', 'EOSF', 'At', 'this', 'layer', 'functions', 'addressing', 'the', 'management', 'of', 'a', 'wide', 'geographical', 'area', 'are', 'located', 'Complete', 'visibility', 'of', 'the', 'whole', 'network', 'is', 'typical', 'and', 'as', 'an', 'objective', 'a', 'technology', 'independent', 'view', 'should', 'be', 'provided', 'to', 'the', 'SML', 'The', 'NML', 'has', 'the', 'following', 'four', 'principal', 'roles', '', 'Control', 'and', 'coordination', 'of', 'the', 'network', 'view', 'of', 'all', 'Network', 'Elements', 'within', 'its', 'scope', 'or', 'domain', '', 'Provision', 'cessation', 'or', 'modification', 'of', 'network', 'capabilities', 'for', 'the', 'support', 'of', 'service', 'to', 'customers', '', 'Maintenance', 'of', 'network', 'capabilities', '', 'Maintaining', 'statistical', 'log', 'and', 'other', 'data', 'about', 'the', 'network', 'and', 'interact', 'with', 'the', 'SML', 'on', 'performance', 'usage', 'availability', 'etc', 'Thus', 'the', 'NML', 'provides', 'the', 'functionality', 'to', 'manage', 'a', 'network', 'by', 'coordinating', 'activity', 'across', 'the', 'network', 'and', 'supports', 'the', 'network', 'demands', 'made', 'by', 'the', 'SML', 'It', 'knows', 'what']