A telco cable, also known as a Telecom cable or Amphenol cable, is a thick cable used for connecting multiple voice or data lines for LANs

Local area network

A local area network is a computer network that interconnects computers in a limited area such as a home, school, computer laboratory, or office building...

 or Telecommunications. The ends use 25 pairs of polarized pins (50 pins total). This cable handles up to 25 data channels or phone lines . The name Amphenol

Amphenol

Amphenol Corporation is a major producer of electronic and fiber optic connectors, cable and interconnect systems such as Coaxial cables. Amphenol is a portmanteau from the corporation's original name, American Phenolic Corp....

 comes from the company that first manufactured it.

Most phone systems use this type of cable. The common color is Gray and made of Polyvinyl chloride (PVC). Most manufactures have standardized on this color for this material. Another standardized color is white, usually associated with Plenum cable. Plenum cable is cable

Cable

A cable is two or more wires running side by side and bonded, twisted or braided together to form a single assembly. In mechanics cables, otherwise known as wire ropes, are used for lifting, hauling and towing or conveying force through tension. In electrical engineering cables are used to carry...

 used in plenum

Plenum

Plenum may refer to:* Plenum chamber, a chamber intended to contain air, gas, or liquid at positive pressure* Plenism, or Horror vacui...

 spaces of buildings. The plenum is the space used for air circulation for heating and air conditioning

HVAC

HVAC refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer...

 systems, by providing a location for ductwork. Space between the structural ceiling and the dropped ceiling

Dropped ceiling

A dropped ceiling is a secondary ceiling, hung below the main ceiling. They may also be referred to as a drop ceiling, false ceiling, or suspended ceiling, and are a staple of modern construction and architecture. The area above the dropped ceiling is called the plenum space, as it is sometimes...

 or under a raised floor

Raised floor

A raised floor or access floor are types of floor that provide an elevated structural floor above a solid substrate to create a hidden void for the passage of mechanical and electrical services...

 is typically considered plenum. 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. .

The Telco cable is also associated with Pre-wired 66 blocks pre-assembled with an RJ-21 female connector are available that accept a quick connection to a 25-pair cable with a male end. These connections are typically made between the block and the CPE (customer premise equipment

Customer-premises equipment

Customer-premises equipment or customer-provided equipment is any terminal and associated equipment located at a subscriber's premises and connected with a carrier's telecommunication channel at the demarcation point...

).