Programming Documents for Pre-K for SA - The City of San Antonio

ELFEXT is derived from swept frequency measurements using a network analyzer and s-
parameter test set. The minimum pair-to-pair ELFEXT loss for any pair combination at room
temperature shall be greater than or equal to the value listed in Table 3.1.
9. Power Sum NEXT
Power Sum NEXT is derived from swept frequency measurements using a network analyzer
and s-parameter test set. The minimum Power Sum NEXT for any pair combination at room
temperature shall be greater than or equal to the value listed in Table 3.1.
10. Power Sum ELFEXT
Power Sum ELFEXT is derived from swept frequency measurements using a network analyzer
and s-parameter test set. The minimum Power Sum ELFEXT for any pair combination at room
temperature shall be greater than or equal to the value listed in Table 3.1.
11. Table 3.1 – Category 5e Permanent Link Limits in dB per ANSI/TIA/EIA-568B.2-1
Frequency
MHz
Insertion
Loss
NEXT
pair-topair
NEXT
power
sum
ELFEXT
pair-topair
ELFEXT
power
sum
Return
Loss
1.0 2.1 >60 >57 58.6 55.6 19.0
4.0 3.9 54.8 51.8 46.6 43.6 19.0
8.0 5.5 50.0 47.0 40.6 37.5 19.0
10.0 6.2 48.5 45.5 38.6 35.6 19.0
16.0 7.9 45.2 42.2 34.5 31.5 19.0
20.0 8.9 43.7 40.7 32.6 29.6 19.0
25.0 10.0 42.1 39.1 30.7 27.7 18.0
31.25 11.2 40.5 37.5 28.7 25.7 17.1
62.5 16.2 35.7 32.7 22.7 19.7 14.1
100.0 21.0 32.3 29.3 18.6 15.6 12.0
12. Propagation Delay
The propagation delay of any pair at 10 MHz shall not exceed 545ns/100m.
13. Propagation Delay Skew
The propagation delay skew between any two pairs shall not exceed 25 ns/100m at 10 MHz.
14. Dielectric Breakdown
The dielectric breakdown of the cable shall be at least 2500 volts DC conductor to conductor.
6.2.1.3 Acceptable Manufacturer’s and Cable Type
1. Panduit
2. General
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