COLLECT LOOP MAKEUP DATA AND CALCULATE EPL
Chart 1006-l Continued
COLLECT LOOP MAKEUP DATA AND CALCULATE EPL
(EXPECTED PULSE LOSS)
STEP PROCEDURE
6
Reject loops whose expected pulse loss is not less than 12.0
dB.
EXAMPLE
Section 1:
Mainframe bulkhead to DFl
-
500m. 26 AWG PIC, underground
Section 2:
DFl
to DF2
-
200m.
26 AWG PIC, inside
Section 3:
DF2 to terminal
-
24 AWG NT D-inside
Therefore:
SLl
=
0.5km,
SL2 =
0.2km,
SL3
=
O.lkm
From Tables 1006A and
1006C:
Ll
= 13.7 dB/km. L2 = 13.7 dB/km. L3 = 13.3 dB/km.
Using the equation in Step 2 we arrive at:
CSLl
= 6.85
dB,
CSL2 = 2.74
dB,
and CSL3 = 1.33
dB
Temperature Corrections:
Using correction factors of
TCFl
= 1.04. TCF2 and TCF3
=
1.
and
using the equation in Step 3 results in
TCLl
=
7.12
dB.
TLC2 = 2.14 dB, and TCL3 = 1.33
dB.
EPL Value:
Neglecting any junction loss per explanation in Step 4.
Step 5 results in an EPL value of:
TSLl
+
TSL2
+ TSL3 + 0 = 11.19
dB.
This is under the I2
dB
limit and meets the criteria.
c