29
If the network configuration is Doubly-Terminated Bus, one
LPI-10 source coupler is placed at one end of the bus to
provide power and one termination (with its termination
jumper in the “2CPLR” setting), plus a standard 105
Ω
TP/FT
termination is placed the other end of the DT Bus (see figure
5.6.)
LPT-11 Physical Layer Repeater
Item Check
When
Completed
Description
30
Only one LPT-11 transceiver is used per physical layer
repeater. The other 1-4 segments (for 2-way to 5-way
physical layer repeaters) connect to the physical layer
repeater using FTT-10A transceivers.
31
The LPT-11 transceiver-based physical layer repeater
connects to no more that five total segments, and the peak Icc
loading is no more than 100mA total.
32
For physical layer repeaters that operate from 0°C to +85°C,
a circuit shown in figure A.3 or A.4 is used.
33
For physical layer repeaters that operate below 0°C, the
PAL-based circuit shown in figure A.5 is used.
34
The LPT-11 switching inductor L1 is a toroid or a shielded
inductor type on the physical layer repeater or else no
magnetic field coupling is seen when making the
measurements described in Appendix D of the
L
ON
W
ORKS
FTT-10A Free Topology Transceiver User’s Guide
, “Avoiding
Magnetic Field Interference.”
35
For 3-way, 4-way, and 5-way physical layer repeaters, the
FTT-10A transceivers are spaced at least 2.5cm (1”) apart
from one another, as described in the PLR section of the
L
ON
W
ORKS
FTT-10A Free Topology Transceiver User’s
Guide.
L
ON
W
ORKS
LPT-11 Transceiver User’s Guide
C-5