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A T1 connection is made using two copper wire pairs, generally on a punch-down block, known as a "66" block (pictured on right). A 66 block has punch down connections on both sides for "input" and "output", where the two connections can remain open or closed by inserting a bridge clip. 66 blocks also have the ability to connect to a 50-pin Amphenol connector (pictured on left), making a quick connection for an entire T1 instead of having to punch each lead down separately. The 66 block is the  What is a T1? T1 is a Telecom term for a 1.544Mhz facility. Also known as a "Hi-Cap" for High Capacity circuit, and more formally as a DS1, for "Digital Service level 1", a T1 is its most common name. A T1 is carried by 4 copper wires (or via fiber and converted back to copper at the customer site) and can support a wide range of services to include voice, data, and video. Through multiplexing (explained in detail later), a T1 circuit can carry a combination of all of these services into a single circuit, reducing monthly access costs as opposed to buying individual DS0 (analog or digital) circuits. How T1 Connections are Used. T1s are considered high capacity circuits, typically used by Telephone companies and medium to large business users that require more than a handful of individual lines, trunks, or DS0-level data circuits. |
T1 Connection
standard for T1 connections in the industry, and also is used for station wiring, analog interfaces, etc. Most telephone equipment rooms have several installed in rows. One or more may be dedicated to the service provider for access facilities, and several more 66 blocks may be dedicated to PBX station wiring. 
