4
Introduction
Line topologies
18
Building Technologies
008250_i_en_--
Fire Safety
2013-08-15
Technical specifications
All FDnet/C-NET devices have an integrated line separator.
Only one stub may branch off between two adjacent line devices.
When there are several stubs next to one another, a line separator FDCL221
must be connected between each one.
Maximum number of stubs/loops:
Max. number of stubs/loops
(sub-stubs)
Loop resistance
R
cable
+ R
iso
Pure cable resistance
R
cable
5
< 240
< 180
10
< 210
< 150
20
< 150
< 100
40
< 100
< 60
Number of sub-stubs depends on line resistance
R
cable
: Pure cable resistance of loop (measured on the loop terminal)
R
iso
: Total of separator resistances of line devices on loop (0.5 per line device)