User Manual

14
APPENDIX A: Max. number of loop powered ABHW-4B
audible bases in one loop
1. The max. number of loop powered ABHW-4B audible bases in one device
loop depends on the available load current for ABHW-4B audible bases. The
available load current for loop powered ABHW-4Bs (I) can be calculated by:
I = Imax – Id
In which, Imax is the max load current in one loop under the worst case
scenario with 50 Ω cable resistance. Id is the total load current for the
devices loaded in the loop.
Figure 11: Max. number of loop powered ABHW-4B in high dBA
Figure 12: Max. number of loop powered ABHW-4B in low dBA
Loop Powered ABHW-4B (Low dBA)
0
10
20
30
40
50
60
0
50
100
150
200
250
Load Current (mA) for ABHW-4B
audible base quantity
Number of
ABHW-4B
Loop Powered ABHW-4B (High dBA)
0
5
10
15
20
25
30
35
40
0
50
100
150
200
250
Load Current (mA) for ABHW-4B
audible base quantity
Number of
ABHW-4B