L
ON
W
ORKS
LPT-11 Transceiver User’s Guide
5-9
I
is the average application current of a device. The distance of an LPT-11 transceiver from the
LPI-10 module is the
device distance
,
d
. For each branch, the sum of the products of a device
distance and the application current of that device must not exceed a constant:
I
1
*
d
1
+
I
2
*
d
2
+
I
3
*
d
3
+
. . .
≤
K*
α
where
K
is the nominal value, dependent on wire type:
K=1135 Amp*Meters for Belden 85102 and Belden 8471, 16 AWG
K=430 Amp*Meters for JY (St) Y 2x2x0.8
K=300 Amp*Meters for Level 4/ 22AWG
K=190 Amp*Meters for Category 5
α
=
1
1 + 0.00393*(temp - 25°C)
, accounting for average wire temperature
At 25°C,
α
=
1. Note that
α
is greater than one when average wire temperature is less than 25°C
and is less than one when the temperature is greater than 25°C.