7-4
MDF/lDF DESlGN: DEFINITY GENERIC 2 WITH UNIVERSAL MODULES
Connecting Jumper Wires
To facilitate cross-connections, connect jumper wires as follows:
●
Use the layout and instructions shown in figure 7-2,
Jumper Placement,
for the 110A terminal
blocks. (Figure 7-2 illustrates a layout for frame mounting, but the layout applies to wall mounting
as well.)
●
Use only the number of jumpers required for a connection. There is no advantage in using a 3-pair
for a 2-pair circuit.
●
Make sure that 80% of the jumpers are less than 20 ft long. This can be done in the largest of
installations, as described under Designing the MDF earlier in this chapter.
●
Maintain clean contacts on the terminal blocks by using a spudger tool (110 tool; comcode
405423260). Clean contacts by:
— Removing jumpers with a perpendicular motion from the connecting block
— Always using the spudger to clean the contacts immediately after you remove the jumper wires
Jumper Placement Rules:
● Index strips consist of a right and a left half. Dress
pairs l to 12 to the left and dress pairs 13 to 25 to
the right.
● Eliminate "spider webs" and use all horizontal
wireways equally.
● Use small amounts of diagonal dress in the
horizontal wireway system, if needed, but avoid
diagonal dress during system installation.
Examples:
● Block B1, row 7, pair 10 to block B8, row 2, pair
24.
B1 left, V1 up, H1 right, V3 down, B8 left.
● Block B4, row 6, pair 8 to block B10, row 2, pair
12.
B4 left, V2 down, B10 right.
● Block B3, row 11, pair 16 to block B5, row 1, pair
1.
B3 right, V2 up, H2 left, V1 down, B5 right.
Figure 7-2. Jumper Placement
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