Highspeed
Data/LAN Cable
|
|
| __ |
Enhanced
Category 5 Cable - Power Sum |
| Multi-Pair
Bunched Style**
| Installation
Location |
Number
of Pairs |
Calculated
Cable O.D. |
| In. |
MM. |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
6 |
.202 |
5.13 |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
8 |
.223 |
5.67 |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
12 |
.265 |
6.74 |
| Plenum
Rated PN & Non-Plenum
Rated PN*
|
25 |
.477 |
12.12 |
**Pending UL approval. |
| Multi-Pair
Distribution Style
| Installation
Location |
Number
of Pairs |
Calculated
Cable OD |
| In. |
MM. |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
8 |
.412 |
10.46 |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
12 |
.444 |
11.28 |
| Plenum
Rated PN & Non-Plenum
Rated PN
|
24 |
.595 |
15.11 |
| Plenum
Rated PN & Non-Plenum
Rated PN*
|
25 |
.595 |
15.11 |
*UL verified to Category 5. (Other UL verifications
pending.)
For further construction details, Call or e-mail
us. |
| BACKGROUND: |
| ANSI
EIA / TIA 568-A specifies two methods of evaluating
cross talk in cables. |
| "PAIR-TO-PAIR"
OR "WORST PAIR" METHOD |
| ANSI
EIA / TIA 568-A directs that cables with less
than 5 pairs under a common final jacket use
the "worst pair" method of evaluating
crosstalk. In general terms, a signal is injected
into one pair and the energy coupled to each
of the other pairs is measured and recorded.
This procedure is repeated until all pair combinations
are evaluated. For example, a four pair cable
requires six measurements to evaluate all pair
combinations. A 25 pair cable requires 300 measurements.
The cable's crosstalk performance is the result
(expressed in dB) from the pair combination
that displayed the highest energy transfer (
i.e. the poorest crosstalk performance). |
| POWER
SUM METHOD: |
| For
cables with 5 or more pairs under a common final
jacket, EIA / TIA requires that the impact on
each pair from multiple disturbing pairs be
evaluated. Pair to pair method. The Power Sum
crosstalk is calculated for a given pair by
combining the crosstalk results between that
pair and each of the other pairs in the cable.
Power Sum specifications are more stringent
than worst pair specifications. For a four pair
cable, a Power Sum requirement of -32 dB is
roughly equivalent to a -34 to -35 dB worst
pair requirement. For a 25 pair cable, a power
Sum specification is typically 6 dB more stringent
than a comparable worst pair specification. |
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