Answer: trunklines

AnswerCrossword Clue
TRUNKLINESMain phone circuits
TRUNKLINESCommunication channels
TRUNKLINESLong-distance arteries
TRUNKLINESMajor long-distance channels
TRUNKLINESMajor phone connections
TRUNKLINESDirect telephone connections
TRUNKLINESPhone connections
TRUNKLINESMajor transportation routes
TRUNKLINESMain telephone connections