Cables are terminated on the outside row of punch lugs and cross-connects are
made on the inner lugs.
This avoids accidently cutting the cable wires when placing cross-connects.
The "tip" is terminated on the top lug of a pair and the "ring" on the lower lug
of a pair.
All pairs of a cable should be terminated, even if they will not be used
This allows you to add more lines at that location in the future or switch pairs
if one is broken
somewhere in the cable.
This will also prove useful if you should ever install a key-system, since many
systems will require a 4-pair station
cable to each jack.
If you use a mix of 4-pair and 2-pair cable, I recommend reserving the two
positions after each 2-pair cable.
That permits future expansion of that jack location to 4-pair by either
replacing the cable or running a second 2-pair cable.|
The first concern is to get the lines from the NID to the 66-block. This is done with standard phone cable. I recommend using one cable with at least four pairs. Two 2-pair cables can also be used if that is already available. If 2-pair cableis used for the NID connection, be careful to tag and identify which cable is used for line one and two and which for line three, since the wires will be the same color in both cables. In the example at left, a 4-pair cable from the NID is terminated on pair positions 1-4.
Station cables can be 4-pair or 2-pair cables coming from a jack location. If the house was originally wired with 2-pair cable, some jack locations will require more pairs than are available in the existing cable. I recommend running a new 4-pair cable to these locations. However, you may be able to salvage and reuse some of your existing 2-pair wiring going to locations which will only require access to one or two lines. Just make sure that they only go to one jack and route them to the hub. If the cable will not reach the hub you will either have to replace it or splice on an extension. Splices are a potential failure point, so be careful if you decide to extend a cable. Where practical, I would recommend replacing all cable with new 4-pair cable.
The example shown is based on the following scenario:
For the purpose of the illustration, I have shown the cross-connects for each line in different colors.