I have a school with an existing CIX 100 cabinet and they have built and addition school building which is at least 350 meters away. I do not believe the Toshiba digital stations will operate one one pair at that distance. Using two pair is not an option as they have 16 new phones and only 20 pair ( 5 Cat 6 cables ) between the buildings.
What is best way to tie the two buildings together and they would like to use the digital sets at each site and not IP phones.
Can anybody make a suggestion for this.