What Are Punch Down Blocks
Punch-down blocks have been designed to supply a interconnection point for telephone cables. They streamline cabling installment by giving an individual termination position for wires coming into a building or cabling cabinet. Every strand of twisted pair wire is semipermanently hard pressed in to a channel within the punch-down block. The channel anchors the strand and permeates the insulating material to supply the electrical interconnection.
There are many kinds of punch down blocks from different suppliers; two of the most typical are:
Siemens S66M1-50 termination block, frequently known as a “66 block”
AT&T 110/A Block, generally referred to as a “110 block”
From the punch down block, patch wires can eventually be run to the jacks of equipment, like hubs (for LAN cabling) or perhaps a private branch exchange (PBX) (for voice cables).
The 66 Block Diagram exhibits how connections are set up on the punch down block. In each and every horizontally strip, the 2 left hand contacts use a built in power link between them. Similarly, the 2 right hand connections also share a built in link. The middle 2 connections aren’t immediately linked to one another, but could be connected by punching a cable on to each connections, or linking these with metallic “bridging clip.” Once the 2 middle connections within the exact same row are linked, the many other connections on a single row are electronically linked to one another.
66 Block Diagram
66 Block Diagram
The 66 Block Diagram displays how a punch-down block is generally utilized to link client owned or operated LAN cabling to the wires possessed by the phone company. Every single inbound telecom company cable is linked to 1 of the exterior connections on the 66 block. To carry on that interconnection in to the LAN, the client joins an additional cable, such as one follicle of a Category 5 cable, to the complete opposite exterior connection on the exact same row. Then the client links the 2 middle connections to connect the phone company line to the LAN cable. This technique of linking wires is less dangerous and much more structured than merely folding the ends of 2 cables together.
A 66 block consists of fifty rows of connections. This is sufficient to terminate an arriving 25-pair wire on 1 section, and link each and every cable of that set to a matching cable on the other section of the block.
In most instances, a network specialist might terminate a 50 pair wire on a solitary 66 block, by making use of every exterior set of connections to link 1 inbound cable and 1 LAN cable. The two middle connections are not linked, so the complete opposite set of connections on the exact same row will be utilized to link a distinct exterior cable to a different interior cable. This layout is refered to as a “split 66 block,” due to the fact the block is successfully divided in to when the middle set of connections is not linked.
Punch-down blocks are generally installed to plyboard sections fastened to the cabling cabinet walls. Some punch-down blocks can come with a sequence of RJ-45 outlets, so that specific cables can be punched down at one area, and connectorized patch wires can be connected at the other.