Telco cable

[1] This cable handles up to 25 data channels or phone lines.

Most phone systems use this type of cable[citation needed].

The common color is gray and made of polyvinyl chloride (PVC).

Some drop ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space.

These connections are typically made between the block and the CPE (customer premises equipment).