COLLECT LOOP MAKEUP DATA AND CALCULATE EPL
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Chart 1006-l
COLLECT LOOP MAKEUP DATA AND CALCULATE EPL
(EXPECTED PULSE LOSS)
STEP PROCEDURE
1
3
4
Determine junction loss. (Figure 1006-l)
5
Collect loop makeup data between the line card and the terminal, For each cable section,
the data required is:
the cable type (PIG or pulp)
gauge
length
type of plant construction (underground. aerial,
inbuilding)
Calculate individual cable section losses using the figures in Tables 1006-A. 1006-B,
1006-C. and the following equation.
. .
CSLi
=
SLi
x Li
l
CSLi
=
cable section loss for section “i”.
l
SLi
=
section length of section “i”.
l Li
=
loss per unit length for section “i”. --
Correct individual cable section losses for maximum cable temperature using the following
equation.
TCLi
=
CSLi
x
TCFi
l
TCLi
=
temperature corrected loss for section
“i”
l
TCFi
=
temperature correction factor for section
“i”
CORRECTION FACTORS
Aerial Cable TCF
=
1.1
Underground cable TCF
=
1.04
Inbuilding cable TCF
=
1
Note: Junction loss due to gauge discontinuity of outside plant cables and D-inside
wire varies between 0.03
dB
and 0.07
dB
and can be ignored. However, AMP
25-pair
under-carpet wiring has a characteristic impedance of 40 Ohm at 256
kHz
and its
junction loss is approximately 2
dB.
This must be included in the calculation.
Calculate the EPL by finding the sum of the above items.