# Digit Block

Adding digit blocks permits the programming of additional directory numbers. If all available digit blocks are in use, you must add more before you can program additional directory numbers.

Adding one digit block is not always sufficient to allow the programming of 10 additional directory numbers. Adding non-consecutive directory numbers that require new roots and paths uses up more digit blocks. To use the least number of digit blocks, add directory numbers consecutively.

x represents one digit block: one digit block contains 0,1,2,3,4,5,6,7,8,9,*, and #.

x 1 | x 0 | x 0 | x 0-9,*,# | 4 digit blocks to add directory numbers 1000 - 1009 (including 100* and 100#
|  | x 1 | x 0-9,*,# | Plus 2 digit blocks to add directory numbers 1010 - 1019 (including 101* and 101#
|  | x 2 | x 0-9,*,# | Plus 2 digit blocks to add directory numbers 1020 - 1029 (including 102* and 102#
| x 1 | x 0 | x 0-9,*,# | Plus 3 digit blocks to add directory numbers 1100 - 1109 (including 110* and 110#
x 2 | x 0 | x 0 | x 0-9,*,# | Plus 4 digit blocks to add directory numbers 2000 - 2009 (including 200* and 200#