How to do Telephone Wiring

LAN wiring components found in the telecommunications room, you will
usually also find all of the wiring for the telephone system, because the two are interrelated. In
most companies, a computer and a telephone are on every desk. Software programs are even
available that can connect the two technologies and allow you to receive all of your voicemails
as e-mails. These programs integrate with your current e-mail system to provide integrated
messaging services (a technology known as unified messaging).
The telephone cables from the individual telephones will come into the telecommunications
room in approximately the same location as the data cables. They will then be terminated in
some kind of patch panel (cross-connect). In many older installations, the individual wires will
be punched down in 66-blocks, a type of punch-down block that uses small “fingers” of metalto connect different UTP wires together. The wires on one side of the 66-block are from the
individual wires in the cables for the telephone system. Newer installations use a type of crossconnect
known as a 110-block. Although it looks different than a 66-block, it functions the
same way. Instead of using punch-down blocks, it is also possible to use the same type of patch
panel as is used for the UTP data cabling for the telephone cross-connect. As with the data
cabling, that option enhances the flexibility of your cabling system.
The wires on the other side of the block usually come from the telephone PBX. The PBX
controls all the incoming and outgoing calls as well as which pair of wires is for which telephone
extension. The PBX has connectors on the back that allow 25 telephone pairs to be connected
to a single 66-block at a time using a single 50-pin connector
The number of 66-blocks is as many as required to support the number
of cables required for the number of telephones in the telephone system.